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Loft Conversion Costs 2021 | Loft Conversion Prices

What is a Loft Conversion?

Loft conversions transform your loft or attic space to give you additional rooms and add value to your property. The style will depend on the size and shape of your property. Your contractor will either build on top of your existing roof or completely rebuild it to add more usable space.

What’s the average cost of a Loft Conversion? 

Not all loft conversions were created equal! They come in all shapes and sizes, with costs varying depending on the labour required and the complexity of the job. 

To give you a general idea here’s a breakdown of the average price based contractor fees across Canada: 

Loft Conversion costs
Average cost (in total) $28,000
Minimum cost (in total) $6,000
Maximum cost (in total) $50,000

Factors influencing cost 

Before you go ahead with a loft conversion, you need to think about what would work best for your budget and the property. Here are some key points to help you make your decision: 

Type of loft conversion 

The type of loft conversion you opt for will be the biggest determiner of costs. Cheaper loft conversions such as dormers focus more on adding more natural light rather than changing the structure and layout of the room, as you would find in a hip to gable conversion. 

The type of loft conversion you choose will depend on your property type as well as what you want to achieve. For example, you may want to install a bedroom and an ensuite or simply increase the usability of the space by adding more natural light. 

Let’s have a more detailed look at the different types of loft conversions and their prices: 

Loft Conversion prices by type
Type of loft conversion Highest average price Lowest average price
Dormer loft $20,000 $13,000
Mansard loft $50,000 $15,000
Hip to gable loft $50,000 $18,000

Dormer loft

Dormer lofts are often referred to as ‘box conversions’ due to the shape they create on top of your roof. Compared to other loft conversion types, dormers are by far the cheapest. They start at around $13,000, though the price could be even cheaper for smaller roof spaces. 

Dormer lofts are a lot less labour intensive. All your labourer needs to do is add a structure on top of the roof space, rather than rebuilding or remodelling the outside walls. 

Hip to gable

Most homes have a sloping roof which would prevent you from making full use of your loft space even when converted. A hip to gable loft conversion removes the slope and builds upwards so that the wall remains straight on one side until it reaches the top of your roof.

Hip to gable conversions is a large investment compared to dormer loft conversions, starting at around $18,000, and rising to $50,000 or more in some cases. 

Mansard Loft

Taking inspiration from 17th-century French architecture, Mansard lofts add on a brand new roof to your home. You’ll get plenty of usable space with a mansard loft, as they are built flat and upwards rather than being sloped. 

Like hip to gable loft conversions, mansard lofts are one of the most expensive loft conversion types. However, the stunning finish they give will undoubtedly increase the value of your home, so they are well worth it if within budget. Your property type and personal taste will greatly influence which style you go for. 


Like most services, the price will also be influenced by where you live. Prices tend to be higher in major, larger cities to accommodate for the higher cost of living. Here’s a rough idea of how much you’ll pay in two major Canadian cities: 

Loft Conversion costs by location
Location Maximum cost Minimum cost Average cost
Toronto $50,000 $25,000 $37,500
Vancouver $50,000 $16,500 $33,250

Interior jobs

Once your loft conversion is built, you’ll need to make sure it’s liveable! Remember that you may need to pay a contractor for interior jobs, such as removing old roof trusses, installing windows and insulation.  

You should also factor in the cost of any architects or interior designers. If you are installing a bathroom, this could add around $5,000 to the project depending on the size and spec. For bedrooms or offices, you’ll also need to think about the cost of decorations and furnishings once the building work has been completed.

Getting a loft conversion – is it worth the cost? 

If you’ve outgrown your property but you’re not keen on moving, then a loft conversion is an ideal solution! From growing families to home offices, and even landlords looking to increase their yields – a loft conversion has endless benefits. The best loft conversions are carried out by trusted, regulated companies. These will add the most value to your home, especially when executed to a high standard. 

Increase the space and value of your home – find a reliable Loft Conversion Specialist on Bark. 

What The Average Cost Of A Loft Conversion?

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The Cost Of A Loft Conversion

It’s a question asked by thousands, ‘how much does a loft conversion cost?’ But it might as well be, ‘how long is a piece of string?’ The costs for loft conversions can vary greatly depending on the type of loft extension you opt for, along with what you do to said loft conversion. There are also other factors to consider from your location all the way down to the type of staircase for your loft conversion you decide to have installed. 

While an exact price may not be possible to ascertain without an in-depth consultation, we can give you a better idea of what’s possible by giving you some average prices for varying loft conversions to date. 

From the roof structure to the need for planning permission and more, please remember any average costs are exactly that, average and will of course be subject to change.

1) Velux Loft Conversion – otherwise known as ‘room in a roof’ loft conversion, the Velux loft conversion. This is most likely the cheapest and quickest way to convert your loft however it’s worth noting that while it does save on cost, time and of course disruption, it’s only possible to do so if you already have enough space in your loft to play with. It usually consists of adding insulation, a staircase, skylights, electrics, lighting, heating and any fire safety measure.

2) Dormer Loft Conversion – dormer loft conversions are one of the most popular out there. They’re an incredibly versatile choice, allowing you to extend either at the back or side of your property (planning permission permitting). They add on a great amount of space inside too however once again, will vary on cost depending on how many dormers you add. Prices vary depending on the size and/or house they are being built on, please contact us for a quote.

3) Hip To Gable Loft Conversion – this is a super popular option and involves converting the sloped side of the roof, otherwise known as the ‘hip’, into a flat edge in order to provide additional space inside of the loft. Again hip to gable loft conversion prices will vary depending on what else you have done inside it would be best to contact us for a quote.

4) Mansard Loft Conversions – Mansards and L-shape Mansards are amongst the most expensive type of loft conversion, but do add great value to your property.

Speak To Us About Loft Conversions


Contact Clapham Construction Today

If you’d like more help and information on loft extensions, or would like to book in a free consultation with our team, contact Clapham Construction Service on 0203 950 7957 or email us via [email protected]. We also offer a design and planning service to help you achieve the amazing loft conversion you want. Our team will be only too happy to take a look at your loft space, discuss your desired outcome and give you an estimate of the cost to achieve your dream loft conversion. 

As London’s leading loft conversion specialists, we’ll guide you throughout the entire process to ensure you know what’s happening and when. We ensure transparency throughout, especially regarding price and will always respect your budget from the very beginning.

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Installation and replacement of roofing in Moscow and the region

Services for the reconstruction of the attic

  • competent measurement of the structure;
  • individually selected solution for each object of reconstruction;
  • taking into account all the nuances of reworking the object and the wishes of the client;
  • quality restoration project;
  • roof removal services;
  • repair of truss structure;
  • batten replacement;
  • installation of roofing;
  • roof insulation
  • under-roof space finishing;
  • work according to regulations and provide a guarantee.



Roof repair services

1. Selection of roofing material. The cost of roofing materials in our company is ten to fifteen percent lower than the market price when concluding a contract for installation or repair work.
2. Roof design. During the formation of the project, the type of load-bearing structures, the architectural image of the roof, the materials used (soft roof, metal tiles) and so on are visualized.
3. Roof installation. Our specialists carry out the preparation of the foundation, the construction of the frame, the installation of thermal insulation, roofing material.
4. Roof insulation. We also provide services for the installation of insulating materials that provide comfortable living.

SEND REQUEST 9View all works 0033


About our workReviews

Alexander and his team rebuilt our house with a two-story extension and a veranda. We were very, very pleased.

Initially, we discussed the project, which was converted to our “Wishlist” 7 times, no less. At the same time, each time they gave us competent advice and listened to us.

After agreement, during the construction process, we were provided with a photo report every day, thanks to which we monitored the construction progress, and there was no need to travel and control the situation on the spot.

And most importantly, timing! We got everything done in 4 weeks, although it seemed that it was simply impossible. Therefore, we now live in a large and comfortable house. I recommend the company! My personal rating is 10 out of 10!!!

Object: log house
Location: Chekhov district, Stremilovo
Type of work: Annex
View photo


Item No. Name of works Unit Cost of works
1 Installation of truss system sq. m. 390 r.
2 Installation of superdiffusion membrane sq.m. 50 p.
3 Lathing installation sq.m. $110
4 Installation of counter battens sq.m. 160 rubles
5 Installation of plywood or OSB (for soft roofs) sq.m. 220 rubles
6 Installation of the valley, end, cornice strips and ridge m.p. $190
7 Installation of shingles sq.m. 390 r.
8 Installation of underlayment for soft roofing sq.m. 90 p.
9 Installation of metal tiles sq.m. 270 r.
10 Installation of ceramic tiles sq.m. 620 r.
11 Installation of profiled sheet sq.m. 270 r.
12 Installation of ondulin sq.m. 290 r.
13 Treatment of structures with a protective composition from an airbrush sq.m. 50 p.
14 Insulation of the truss system for 1 layer sq.m. 60 p.
15 Installation of gutter system m.p. 390 r.
17 Roof eaves filing with soffits sq.m. 540 r.
18 Roof eaves filing with timber imitation sq.m. 540 r.
19 Snow retention installation (tubular) m.p. 490 r.


An experienced specialist will arrive at the site at the time agreed with you, make all the necessary technological measurements of the roof, answer all your questions, help you decide on the material and select the optimal technology for the reconstruction or repair of the roof specifically for your home. The result of his work will be a detailed estimate of all costs, taking into account the required amount of material, all components, installation costs, as well as a drawing with all dimensions.


Discounts for those who build with us

You order construction from us, and we give discounts on materials. For example, PVC windows are up to 10% off, doors – 7%, insulation – up to 20%

Help in choosing finishing materials

We offer only high-quality materials at competitive prices. Experienced specialists will help determine the materials for construction and decoration and help save money.



We offer the best

In our work we use several types of roofing: metal tiles, flexible roofing, profiled sheet, ondulin.

Metal tile roofing

Metal tile is one of the most popular modern roofing materials. It provides outstanding technical characteristics, reliability and a pleasant appearance of the roof. Manufacturers and suppliers of metal tiles have a wide range, which includes various possible areas and colors of the coating.

The technology of installation of metal tiles depends on various factors, including the type and features of the material chosen and the shape of the roof.


Flexible roofing

The most common types of flexible roofing are soft tiles, bitumen (plastobitumen and rubber bitumen), membrane or rolled roofing, polymer coatings and euroruberoid. This is a high-tech material that will protect the roof from the penetration or harmful effects of water or other liquid. It does not require additional protection measures.

The shape of the roof for the installation of such a cover can be any. Each flexible roof material has its own technological properties and installation features, which determine the choice of one or another type of flexible roof.


Ondulin roofing

Ondulin is a lightweight and at the same time strong material of French origin. These are wavy fibrous sheets saturated with bitumen. Ondulin is suitable both for the quick and relatively uncomplicated construction of a new roof, and for dismantling or repair.

The main characteristics of ondulin are high strength and water resistance, long service life and ease of installation. Its important feature is flexibility, which makes it possible to cover a frame of any shape and complexity with ondulin and the possibility of its use in the repair of structures of various purposes.


Rafter system

Rafter system is the framework of the roof and the most important component of the supporting structure of a well-built structure. A reliable skeleton resists strong air currents and evenly distributes external loads on the internal supports of the house.

Sloped and vertical rafters are the basis of the entire roof structure, so their construction is a serious task in the construction of the roof. Knowing the specific features of roofs of various shapes, you can prepare for the independent manufacture and installation of the truss system.

Lightning protection

It is installed not only on different types of roofs, but also on chimneys, facades and spillways. The arrangement of structures will vary depending on the type, size and configuration of the facility. Wide specialization and experience of professionals in the installation of lightning protection are necessary to comply with safety standards and maintain the external aesthetics of the structure.

Our specialists will develop a project, calculate and install passive lightning protection on structures of any type, shape and size. Professional installation of the system guarantees long-term operation.


Installing and filing the roof eaves is an important stage in its construction. The eaves are called the lower parts of the roof slopes, protruding beyond the boundaries of the building. This is part of the length of the rafters or special fillies that artificially lengthen the rafter leg. Visually, they are a continuation of the roof itself and serve to protect the walls from precipitation.

Drainage system

Drainage system is needed for the accumulation and removal of atmospheric precipitation from the walls and foundation of the building. Water, flowing from the roof, floods and destroys the foundation of the structure, it can be dangerous for operation, so drains are installed around the entire perimeter of the building.

Our team of professionals will select the best exhaust system for your requirements and install it to the highest quality standards.


Installing snow guards

Snow accumulating on the roof is not only unsafe for passers-by, but also poses a danger to roofing and other building structures. Roof repairs are often required after the snow melts. In such a situation, the installation of snow retainers is a necessary attribute of safety and rational economy.

There are two types of snow guards: those that allow snow to pass through and those that prevent snow masses from descending. Which option of snow retainers to choose directly depends on the amount and volume of snow in a particular region, the reliability of the design and compatibility with the roof.

Roof windows with installation

Roof windows are one of the most difficult elements in the design.
If during the installation of skylights any minor, at first glance, violations of the waterproofing are made, then problems cannot be avoided in the future. Such an unpleasant situation as a leaking roof can occur.

The cost of installation of skylights will be indicated after the actual assessment of specialists. The evaluation criteria include the size of the windows, as well as additional work. You can get more detailed information on all your questions by contact number.



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Reconstruction of the roof of the house – MOSCOW UNION OF ROOFERS

Renovating the roof of your private home will allow you to start making the most of your attic space by adding windows and increasing usable floor space. At the moment, this is one of the economical ways to solve your problem.

Roof renovation cost

How much does a roof renovation cost? The price will depend not only on the area of ​​the roof, but also on the type of defects, which include:

  • The presence of roof leaks and condensate;
  • Presence of cracks and blisters;
  • Wear of roofing material;
  • Deformations and displacement of roofing;
  • Deformation of rafters and purlins;
  • Uneven heating or uneven roof cooling;

9010 2 m2

Name of works Prices for work in rubles Roof type complexity coefficient Units of measurement
Construction of a new roof with a full roofing cake 950 1 m2
Reconstruction into a warm attic 1250 1
Installation of metal tiles 300 1 m2
Installation of soft tiles 300 1 m2
Installation of natural tiles 600 1 m2
Installation of waterproofing 90 1 m2
Insulation layer 150 mm 300 1 m 2
Installation of valleys 300 1 m.
Installation of spotlights m.
Installation of lining m. m.1

Roof window installation 6000 1 pcs.

When is a roof renovation required?

  • The structure has become so worn out that its further operation is not possible.
  • The builders initially made significant mistakes and now a complete reconstruction of the roof in the country house is required.
  • Major repairs have not been done for a long time (applies to apartment buildings).
  • You are not satisfied with the design features.
  • You have decided to convert the attic space into a living space (attic), but this is not possible due to the lack of good ventilation.

Any work to change the structure of the roof of the house is considered very difficult. We do not recommend doing them yourself without relevant experience.

The specialists of our professional organization are ready to:

  • replace old roofing with new;
  • replace rafters and some roof elements;
  • change the dimensions of the roof;
  • completely reorganize the attic space according to your wishes.