Wooden extensions self build: Step by Step Kit Guide

10 Ways On How To Build A Timber Framed Extension

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10 Ways On How To Build A Timber Framed Extension

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Building a timber frame extension is one of the best ways of adding space to your home. Not only that, but it also increases the beauty and the value of the property. Timber is one of the most common building materials available in the market. Not to mention how cost-effective it is as well. 

Timber frame house extensions look beautiful even on buildings that are made up of stones, bricks, and so on. Thus, it only adds to the beauty of the house, so you do not have to worry about the aesthetics of the extension. In this guide, we will discuss 10 ways how to build a timber framed extension safely.

However, there are two major types of timber frame extension that you may work on. Let’s see what are they and how to build them in 10 possible ways.

Table of Contents

Types Of Timber Frame Extensions

There are two main types of timber frame house extensions. These types are:

  •  Open Panel Systems

In open panel extension systems, the external sheet of timber is fixed to the frame of the timber extension, but the internal face of the house is open. The electric connections are set, and the plumbing, insulation, and so on are installed. Once all of these works are completed, the frame is closed up properly.

  • Close Panel Systems

The concept of the close panel extension systems is quite similar to the open panel extension systems. However, the difference is that the services such as electric lines, plumbing, insulation, etc., are already present there. The timber panels generally come without any doors and windows, but a few manufacturers deliver completely designed timber panels.

10 Ways On How To Build A Timber Framed Extension Safely

1. Proper Communication

Even though timber is a cost-effective material, building a timber frame extension is a costly investment. And in order to make sure that you get the best results out of the timber frame extension, you must establish proper communication with the designers.

Adding an extension to your home is a great way of adding space, but it is also a stressful process. Proper and clear communication with the designer will allow your home to get the best build and will also reduce your stress. 

2.Choose The Right Builder

Choosing the right builder for a timber frame extension is crucial as a wrong decision can turn your dream project into a scary nightmare. There are various builders who work with timber frame extension systems, but not all of them are worth it.

It is essential to do proper research on the builder before giving them the contract. Visit the previous works done by the builders and make sure to check the reviews of the builders properly. You can also ask for recommendations from friends and family who have got similar work done.

3.Landscape and Groundwork

It is essential to make sure that you consider the landscape and groundwork of your property before you start building. Consider the place where you want the timber frame extension to be. For a better solution, consult a groundwork professional, and they will help you to find the easiest solution. 

After you complete building a timber house extension, make sure to take care of the landscape before inviting friends and family over.


Many people find it confusing while thinking of ideas on how to build a timber framed extension. In cases like these, consult your designer and think out of the box. You can build a timber frame first-floor extension. Or you can also build it outwards or downwards as a basement. No matter which way you build the extension, it will be nothing uncommon.

In order to make your timber frame extension unique, you can add a few intricate and quirky details. This will make sure that your extension is different from the majority of the timber frame house extensions.


The one thing that completes the timber frame extension is the proper and small finishes. The materials that you use to add finishes to the extension will express its beauty and will improve the overall look of the house. The most common material used to give a beautiful finish to the timber extension is Timber Cladding.

6.Block Build Or Timber Frame Extension

While many people prefer block build for an extension, the majority of people go with the timber frame house extensions. There are several reasons why people choose a timber frame over a block build. These reasons are:

  • Timber framed extension kits are made in a safe environment, and building a timber frame extension does not take a lot of days. Building a block build extension takes up even more time than that.
  • You can use timber frames to complete unique and intricate designs. So, if you are planning on building an extension that is out of the box, then timber is the right choice.
  • Building a timber frame extension is easy and does not require much time. This means that you will have fewer construction and labour costs, and you can complete the project within your budget.


Before you finalise your decision and start building a timber frame extension, consider the purpose of this extension. Think about why you need it and are you actually in need of it or not. Think about the ways how you will utilise this place.

Consider whether you need the extension for a larger kitchen space, living space, or bedroom. Consider how you can make this extension energy efficient so that your bills do not skyrocket. Timber frame house extensions are a great way of saving money on insulation costs.


When it comes to building a house extension, a problem that the majority of the homeowners face is with the budget. Even if the extension is nothing too big, it is very easy to overspend. If we talk about the timber frame extension cost, it depends on the size of the extension and various other factors. 

You will have to take the timber cost, labour cost, designer fees, installation, and so on into account. The best way of preventing yourself from overspending on timber frame extensions is to make a budget and stick to it. And to do that, you need to know the beasic of how to build a timber framed extension so there is no chance of making mistakes. 


If you are planning on building an extension, make sure that you talk to your neighbours about it. A small chat about your plan will help you to make sure that you get the building approvals easily. This will also help the neighbours to be prepared for the construction sound and so on.

10.Building Approvals

You might have to apply to the local authorities for the approval of planning and building an extension. However, whether you have to apply for approval or not depends on the size, shape, and style of the timber frame extension.

There are often times when you do not require planning permission but need building approval. The building permit for an extension makes sure that the extension follows the standard building regulations in the UK.

The Cost Of A Timber Frame Extension

The cost of building a timber frame extension is generally quite less compared to the majority of extension building materials. Usually, a timber frame extension cost ranges between £1500 to £1800 for every square meter of space. However, the cost of the extension mainly depends on the type of the extension.

The cost of a timber frame extension costs less is due to the fact that timber is a cost-efficient material. A timber frame extension does not require a lot of hours which means that you do not have to pay much for labour costs.

There are quite a few factors that affect the timber frame extension cost. These factors are:

  • The thickness of the timber frame extension
  • Type and style of the extension
  • Style of fittings, insulations, and other features
  • Location of the house
  • Design of the timber frame extension
  • Size of the extension

Advantages Of Building A Timber Frame Extension

There are certain advantages of building a timber frame extension. Once you know how to build a timber framed extension, you can leverage it properly.  These advantages are:

  • Lightweight:

Unlike the majority of building materials, timber is very lightweight but durable. Timber is a really great choice if you are looking for material to build an upward extension.

  • Easy To Build:

As we discussed above, timber is one of the most lightweight building materials available on the market. This feature of timber allows builders and labour to complete building a timber frame extension easily. 

The majority of people think that in order to build an extension, you will need an ample amount of space. However, this is not true in the case of a timber frame extension. A timber frame is an ideal building material for adding an extension to small houses and properties.

  • Versatile:

One of the best advantages of a timber frame extension is that it is versatile. You can design and style timber in any way you want, so this gives you the liberty of adding intricate details to your extension.

Not only that, but timber frame house extensions can be cladded and decorated in various ways from the outside. This allows the extension to match with the exterior of the rest of the house.

Timber is a sustainably obtained building material. It can be paired easily with top-quality insulation and double glazing to build an extension that is energy-efficient. Timber frames usually have a void between them, and this void can be filled with insulation. This allows the house to be more energy-efficient while having thin walls at the same time.

Cons Of Building A Timber Frame Extension

In order to build a timber frame extension, we will have to use an expert designer and construction team to make sure that the work is perfect. The work has to be detailed in order to prevent problems in the future.

The designer and construction time you select for building your timber frame extension generally provides a wide range of services. These services include supplying the timber, building the entire extension, and the entire project management. There are a few companies that even provides an aftercare service of the timber frame extension.

One of the best parts about building a timber frame extension is that it can be built on the site easily with softwood and sheet panel systems. However, building a timber extension on site does not cause much trouble to the neighbours. You can also make the timber frame in the factory easily and assemble the entire extension on-site in a short period of time. This will allow the shell life of the extension to be quite strong and weathertight in only a few days.

To take advantage of building a timber frame extension on-site, you will have to make sure that the design is confirmed properly while ordering the frame. The building process slows down if you plan on changing the design on the site. The building process will take less time if most of the work is completed in the factory.


Timber frame extensions do not only increase the space of the house but also improve the beauty and look of the house. Now that you know how to build a timber framed extension, you can now easily go forward to building an extension. If you are planning on building a timber frame extension, make sure to follow all the ways mentioned above properly. 

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Gablok : the story of an insulated block


Added value: structure for self-building

Founded in 2019, Gablok offers a revolutionary insulated timber-frame construction method. Aiming to simplify construction and offer a simple, high-performance, and flat-pack timber house system, Gabriel Lakatos filed his patent in 2018.

A fan of interlocking building block toys from an early age, and involved in traditional construction for 25 years, he came up with the design for stacked insulated wooden blocks.

After many months of research and testing, the self-build house system has been validated by stability, acoustic, and energy performance consultants.

The latest projects made with Gablok

A garage workshop project made of Gablok insulated wooden blocks

Find out more about a garage project created with Gablok insulated wooden blocks. A tailor-made self-build project. Read what our customers have to say.

First self-build site in the Netherlands

Build your own house in the Netherlands? Gablok offers you a flat-pack timber house. Self-build wooden block house in Vaals.

House extension in Wavre

Self-building a house extension in Wavre. Timber-frame self-build and insulated wooden block house extension.


The most asked questions!

  • What type of insulation is used in our self-build blocks? What is their insulating value?
  • Gablok blocks: insulating formwork blocks?
  • What is the weight of a Gablok insulated wood block?
  • What is the span of our wooden elements?
  • What materials make up a self-build block?


Gablok : our stacking blocks

Eight components and insulated wooden blocks for a flat-pack house.

Ytyong Base Blokc 14


Bottom Plate 7

Bottom Block 6

Rain Bariar 11

Treated Lath 9

General insulated block 5

Gablok lintel

Main beam 7

Ytyong 2

Bottom plate 7

Bottom block 6

OSB Floor 13

Gablok beam 3

Vapour barrier 12


Batten 1

Concrete Slab 15

Build your own house in Belgium

House in kit

The Gablok concept is essentially made up of insulated blocks, an adapted floor system, and insulated beams and lintels allowing you to build the exterior and interior walls of your timber house (self-build structure). These components are necessary to assemble the shell of the insulated frame of your future building. These are delivered directly to your site with your assembly plan.

Among other things, this process avoids the excess waste associated with on-site processing.

Once the insulated blocks are assembled, all that remains is to complete the roof (framework + roofing) and the exterior finishing for your home with the finish of your choice (plaster, brick, cladding, etc.).

The interior of your self-build will be ready in the first instance for your various technical elements (thanks to the space left between the battens) and in the second instance for finishing (OSB + plasterboard, etc.).

The system can be assembled extremely quickly and does not require any drying time.

The dimensions of your door and window openings are known as soon as you receive your planning permission. This allows you to order your exterior joinery in advance. Their manufacture in advance is a significant time-saver during the construction of your flat-pack timber house, avoiding on-site stoppages.

The Gablok concept allows for a seamless transition between the various trades involved in completing your new home.

Build your own house in Belgium? This is what the Gablok concept allows you to do!

Stacking wooden blocks

We offer you the possibility of carrying out your plans using our wooden block construction method inspired by the famous interlocking building block toy. As soon as these have been completed, you will receive an assembly diagram with all the steps required to complete your stacking wooden block project.

We will guide you through the construction of your foundation slab and laying the first row of cellular blocks.

Then it’s up to you: follow your assembly plan step by step and your shell will be complete in less than a week.

Build your own house using a flat-pack kit

Build your own house in Belgium

Gablok, the wood frame!


Anne-Marie V.

I find the concept revolutionary! We want more of it !
And especially with passionate and professional people like Gabriel Lakatos and his partner.

Danielle B.

Serious company and nice boss. Do not hesitate!

Evy D.

I’ve been lucky enough to see the evolution of the model house and an artist’s studio (my sister’s) built with Gablok, and I think it’s an ingenious, quick and fun idea! I recommend Gablok 10 000% after these experiences.

Pascal S.

I find the concept very original, it offers the possibility for self builders to consider projects at reasonable prices. Bravo to the designers

Luc D.

An innovative process that deserves to grow! Bravo!!!

Stéphane R. – Self-builder

It was by chance that I heard about GABLOK on the show “On n’est pas des pigeons”. Being an experienced handyman… I was immediately won over by this concept. I had been wanting to build a garage workshop for a long time. I had found THE solution: light and super insulated blocks. Very competitive prices. What more could I ask for? Once the concrete slab was installed, the 40 m² garage was built in one day.
Many of the neighbors couldn’t believe it and neither could I. I really found a very professional and friendly team! I am convinced of the quality of the product. It will certainly satisfy many self-builders.


Extension to a wooden house: what and how to make it

Table of contents of the publication:
Extension to a wooden house: features of the foundation
What material to make an extension to a wooden house

An extension to a wooden house can have any purpose – it can be a veranda, summer kitchen and even living space, such as a bedroom or living room. The only thing that unites them is the general principle of construction – it will be discussed in this article. Together with the site stroisovety.org, we will gradually consider the principle of building an extension, we will pay special attention to its adjoining to an existing building and, of course, we will not bypass all the main subtleties of construction.

Do-it-yourself wooden extension photo

Extension to a wooden house: features of the foundation

By and large, the technology of building a foundation for an extension is not much different from the construction of the foundation of the house itself. Everything is the same – the same formwork, the same reinforcement, and the same concrete. The difference lies in only one point – you need to correctly connect the attached foundation to the existing foundation of the house. We’ll have to take a little care that the two different parts are a solid structure. Naturally, you will not succeed in a complete monolith, no matter how hard you try, but it is quite possible to get closer to this.

This is done in the following way. First you need to release that part of the foundation of the house, to which the additional part will be attached – you need to release it to the full depth of the base to be poured. By the way, it may be less deep, this moment depends on the weight of the extension. If the existing foundation has waterproofing, we clean it off. After that, we arm ourselves with a perforator and a concrete crown with a diameter of 100-120 mm – with the help of this equipment we will ensure the merging of the foundation of the extension of a wooden house with its base. We drill a lot of holes to the full depth of the crown (60-80mm). The more round holes you drill, the better. After that, we change the crown to the drill and drill holes for the reinforcement.

How to build an extension to a wooden house photo

Then everything is standard. In the old foundation, we hammer reinforcing pins into thin holes and tie the reinforcing frame of the new foundation to them, install the formwork, thoroughly rinse the old foundation with water and concrete. All! We leave the foundation of the extension to dry, covering it with polyethylene to reduce the evaporation of the liquid. On such a foundation, it is possible to build extensions to a wooden house from any material.

Construction of extensions to a wooden house

What material to make an extension to a wooden house

By and large, an extension of a room or a veranda to a wooden house can be made of any more or less suitable material: if you like laying bricks – please; love frame structures – also a good option. Even a concrete monolith will do – the main thing is that you have an idea of ​​\u200b\u200bhow it is done correctly. There is only one problematic place here – the same docking of the old house and the extension. The lack of structural integrity brings a lot of problems – that is why it is so important to think over this connection to the smallest detail.

It all depends on the materials to be joined, and the most trouble-free of them is wood, attaching a wooden outbuilding to the same wooden house is quite simple. The simplest and most attractive in this regard is a frame extension to a wooden house. Simply connect the wall beam to the existing walls using powerful self-tapping screws, seal the joint with polyurethane and that’s it. Things are much more difficult if you decide to dock an extension of another material with a wooden house.

Adding a room to a wooden house photo

In such situations, an intermediate embedded part is indispensable. Its purpose is to connect the unconnected. In most cases, this is a metal corner, a channel or just fittings. How are they mounted? Pretty simple.

  1. Fittings. As in the case of the foundation, it is driven into the wooden walls of the house so that half a meter sticks out. It is wrong to drive reinforcement into any place – it must fall on the junction between the rows of block material. Having seized with cement, it will provide a reliable docking of the wooden and block walls. The only situation in which the fittings can be installed randomly is when it comes to deciding how to attach a cast extension to a wooden house. As for the technical nuances of this connection method, they are as follows: reinforcement (in the amount of two pieces per row) is mounted every five rows. To ensure a hermetic fit of the blocks to the tree, it is necessary to create a small (1-2 cm) gap, which is subsequently sealed with polyurethane sealant. It must be closed on both sides with either a flashing or a cement-based mortar.
  2. Channel is a more robust option, providing a permanent connection between wood and block surfaces. Here it is important to correctly calculate its size – the block material used to make an extension to a wooden house should freely enter the inside of this metal product. In fact, its U-shape provides a fixed location for the free edge of the wall. This channel is attached to a wooden surface with powerful self-tapping screws according to the vertical level. It will not be superfluous to take care of the tightness of its fit to a wooden wall – there are several options here. If the wall is smooth, then almost any sealant can be used – for example, PSUL. If we are talking about an extension to a log house, then it is better to use polyurethane sealant for sealing.
  3. Metal corner. In principle, this is the same option as with a channel – it is made from several halves and is somewhat cheaper. You will need a hundredth corner and a strip 50mm wide and 5mm thick. With the help of this strip, the corners are connected by electric welding into a U-shaped structure, the installation of which is carried out in exactly the same way as the installation of the channel. The only “but” associated with the use of corners instead of a channel is a more complex technique for sealing the corners to a wooden wall.

    How to make an extension to a wooden house photo

A very important point in the process of such connections is the high-quality protection of the metal from corrosion – the metal needs to be primed several times and then it needs to be painted the same number of times. Just kidding – just take care of the high-quality protection of metal mortgages from rusting, otherwise a concrete, cinder block or brick extension to a wooden house will not last long, and most importantly, properly.

And finally, a few words about the roof – just like walls and foundations, it has points of contact with a wooden house. Here, everything is usually a little simpler than with the foundation and walls. The roof is made of wood, and it will not be difficult to dock it with a similar material. It is more important to control the fit of the roofing material to the walls of the building – in principle, if there is experience in the construction of roofs, then this will not be a problem. The main thing is to do everything consistently, strictly observing the roofing technology.

As you can see, an extension to a wooden house, or rather its construction, is not much different from the construction of a separate house – we figured out the main differences, but everything else remains unchanged. Yes, and one more thing! The most important point is the foundation. If it starts to sink, then no embedded parts, no cutting-edge technologies will help, since the joint between the extension and the house will constantly expand.

Author of the article Alexander Kulikov

How to make an extension to a wooden house with your own hands

An extension to a wooden house with your own hands – complete instructions you will find drawings, step by step instructions, photos and examples. All this will help to perform complex work quite simply.

Varieties of buildings. There is more than one type of outbuildings for timber houses. Each will differ not only in the base materials, but in certain nuances.


General information

What is the best material to build an extension to the house? They can be:

  • Made of brick.
  • Foam block.
  • From a cylindrical bar.

Another most popular option today is the frame type extension. Before starting direct work, it is important to decide for what specific purposes such an extension will be created.

We can consider as an example what types of outbuildings are:

  1. Sauna – this is another possible variation in the operation of the extension. It should be noted that its structure in this form will be much cheaper than in the role of a separate house.
  2. Veranda – this type of room is required, first of all, for snacking or relaxing. The veranda can be made closed or open (closed will be glazed).
  3. Living room – in this case, we can say that we will talk about expanding the residential home area. In this case, it is required to equip the extension in such a way that it is suitable for permanent residence.
  4. Terrace – a large area made of open wood.
  5. Utility room – this can be anything, for example, a pantry, a kitchen, etc. Accordingly, it is required to take into account all the nuances. So, for example, if it is a kitchen room, you will need to create excellent ventilation.

Consider what foundations are.


Varieties of foundations for extensions

Everyone knows that a strong foundation is an excellent guarantee of stability not just for an extension, but also for the main house as a whole. The most popular types of foundation are two types:

  • Columnar.
  • Tape.

If you have doubts about which one to choose, it will not be out of place to pay attention to what kind of foundation the private house for which the extension is designed will stand. Moreover, it is extremely important to decide in advance how exactly to unite the new from the foundations of the old. Usually, reinforcement bars are hammered into the old one, which will later be mounted into the new one. This “classic” method is used quite often, as it can guarantee reliability and prevent buildings from settling.

Strip foundation

This is a reinforced concrete strip that will run along the common perimeter of the entire structure. This foundation should be located at a shallow depth – higher than the level of freezing of the earth. Due to the fact that it is placed shallowly, it is important for the structure to provide excellent reinforcement so that the soil does not damage it during expansion. If the tape-type base is made correctly, it will become durable and cost a budget. But you should take into account the fact that this foundation is suitable mainly for light buildings.


The principle of such a foundation for an extension to a wooden house is based on the fact that a pillar will be erected at each point crossed by the walls. This base is perfect for frame types of buildings and is quite inexpensive, and among the advantages of a columnar type of foundation is its ability to resist the effects of unstable soil and the absence of the need for waterproofing.


Next, we will consider several options for how to make an extension to a house made of wood with your own hands – examples from various materials with photos, as well as step-by-step instructions and drawings for a frame-type extension.

From a bar

For the construction of such material, the presence of a foundation will be a prerequisite. The rounded timber boasts a beautiful appearance. But it is not so often chosen for residential buildings. This is because it has a small minus – this material is quite heavy, therefore shrinkage occurs after a certain time.

And yet one cannot ignore the advantages of rounded timber:

  • Environmentally friendly.
  • Affordable price.
  • Fast application during work.

Do not forget about the strapping of the material that should be located at the top of the building. Here are some tips from experts to simplify installation work from a bar:

  1. Fasteners are best selected from galvanized metal.
  2. It is also required to make sure to treat everything with an antiseptic, and also with a special refractory solution.
  3. It will be better to insulate the material only from the inside of the room.
  4. To shorten the shrinkage period, it is better to do construction work in the cool season.

Experts also say that if the house is stone, then a movable type of seal will be required to join this extension. Then you can eliminate drafts and reduce heat loss.


If the additional place in the form of a building is made of bricks, then chasing is required to strengthen the joints (for future laying of reinforcement). Bricks are a material that is durable. Anything can be built from it. But you should choose a strong foundation.

Key points to consider:

  • Timber structures must be level and sound, free from rot or signs of rot.
  • Bricklaying is required to be carried out, observing the gaps, as well as appropriate technologies.
  • The foundation for bricks is ideally tape.
  • U-shaped channels are needed to connect the annex to the main building.

Consider one more material.

Foam blocks

This is a relatively inexpensive building material that has a high level of thermal insulation due to its foam structure. And the large size of the blocks makes it possible to significantly reduce the construction time. Moreover, the extension will turn out to be much easier, and therefore will not need to build a fortified base. But this does not mean at all that it can be used without foundations at all. The foam block building for the house has the following advantages:

  • Low risk of fire.
  • Low cost and ease of use.
  • Strength, durability.
  • Reinforced sound and heat insulation.
  • Environmentally friendly material.

But there are also disadvantages, it would be unfair to keep silent about them. This is a high ability of such a material to absorb water vapor from the air, and also not the most beautiful appearance. For this reason, for many, the question of what to use – foam blocks or a frame – is not even worth it. But such shortcomings can be very easily eliminated through proper waterproofing and cladding from the outside with decorative elements. Do-it-yourself extension to a wooden house has the risk of erection, and it is due to the fact that different materials move non-uniformly around each other under the influence of aggressive environmental influences. Professionals do not recommend attaching the extension to the wall surface of the house, but it is better to do it close to it, insulating the joints. Construction of a wooden house from foam blocks can be started as soon as the foundation hardens. It is lined with roofing material, and they also use cement mortar with sand for the first row. Blocks begin to be placed from the corner, and further rows should be fastened together with a special glue.

How to install a framed version

Since a framed extension is the ideal material option, a step-by-step algorithm for building such an option will be presented. It is imperative to observe the following:

  1. At the very beginning, horizontal bars are mounted, and it will serve as the base for all structures.
  2. The beam should be installed directly on the foundation, and for this you can drill holes in it and bend the dowels for fastenings.
  3. Install the uprights next. Here, a beam will also be involved, which is connected to the wall of the main building and to a horizontal base in the corner of the extension.
  4. Connect everything with self-tapping screws.
  5. Reinforce the uprights with metal corners.
  6. The height of the horizontal beam must be selected so that it fits under the main roof with the house.
  7. Before installing the frame, it is necessary to carefully consider how the doors and windows will be located.
  8. In the marked areas, it is useful to install auxiliary beams that will be connected to the main parts of the extension.
  9. When everything is finished, it will be useful to immediately cover it with sheets of moisture-resistant plywood or boards. This will help strengthen the extension.

Now let’s talk about the roof itself.


As usual, the construction of the roof of the frame extension is carried out in several simple steps:

  1. Ceiling beams should be installed at the very beginning. They will be located at a distance of 0.5…0.7 meters. They are attached to the top of the support racks and attached to the base with metal corners and self-tapping screws. They will be laid with the condition that the edges begin to protrude beyond the border of the building.
  2. Install the rafters that form the foundation of the roof. When installing them, an angle of 20-25 degrees is observed.
  3. Next, a transverse support beam must be installed at the roof joint.

The creation of the roof will depend, for the most part, on the material that will be selected. For example, if tiles are used, install a crate on top of the rafters. And the iron for the roof is allowed to be fixed immediately to the base of the rafters, taking into account the fact that the sheets must overlap on the roof of the house. no matter what, before finishing, a layer of waterproofing should be laid. In this case, if the extension is planned as a dwelling, it is also required to insulate it.

Which is better for the floor surface – concrete or wood

It is important to think carefully and make a clear decision on what kind of flooring will lie in the extension – wood or concrete. There are a huge number of projects from various materials on the net. Here are some useful tips:

  • It is a good idea to start the construction work with laying the subfloor.
  • On the side of the floor joist, install a cranial bar with a size of 5 * 5 cm.
  • Lay edged boards on it.
  • Such boards should be covered with two layers of glassine, and it is important to lay a layer of insulation between them.
  • At the end of the floor installation, lay the final version on top of the rough one.

A wooden floor will go well with a milled board because it has excellent ventilation. The concrete floor will be made layer by layer – insulation, insulation and concrete screed.


As you can see, it is quite possible to attach an extension to a wooden house if there are step-by-step instructions, photo examples and understandable drawings. This does not require the help of a professional construction team.