Prices of house extensions: House Extension Cost | Project Estimates

2023 Cost of Pool House

Typical Range:



Cost data is based on research by HomeAdvisor.

Updated June 21, 2022

Written by HomeAdvisor.

Building a 300-square-foot detached pool house costs an average of $114,000, but the total depends on the style and type. Costs for building a pool house from scratch can range from $48,000 for a simple structure to $180,000 for a pool house complete with a bathroom, shower, bar, and/or kitchen. A prefabricated pool house of about 300 square feet will cost about $26,630.

Low End National Average High End
$26,630 $114,000 $180,000

2022 Notice: Material Prices Are Surging

Demand for siding and other building materials has grown over the past year. And as a result, manufacturers are increasing materials prices. Prices have gone up 5% to 10% this year, and many parts of the country are experiencing long delivery times. If you’re planning a building project, we recommend starting as early as possible in the season, preparing for potential price fluctuations, and allowing extra time to order materials.

In this article

  • Pool House Costs by Type and Size
  • Common Pool House Add-Ons
  • Pool House DIY vs. Pro
  • FAQs

Pool House Costs by Type and Size

Pool house costs can vary dramatically. Smaller, simple structures will cost less, while customized pool houses with all the bells and whistles will be more expensive.

Pool House Type Cost
Custom-Built $160 – $600 per square foot
Prefab $26,630 on average
Shed $1,500 on average


A custom-built pool house costs about $160 to $600 per square foot. A small pool house, around 150 square feet, is around $24,000, although additional features like a bathroom or kitchen will increase the cost. A large pool house, over 300 square feet, can cost up to $180,000.


A prefab pool house runs an average of $26,630, with prices ranging from $5,000 to over $44,000. Prefab pool houses are less expensive than custom-built pool houses, and they may be easier to install. But prefab structures tend to be less durable and long-lasting, so you may need to replace them down the line.


A pool house shed costs around $1,500. This is a smaller structure, around 100 square feet, best for storing towels, pool toys, cleaning solutions, maintenance tools, and other equipment.

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Common Pool House Add-Ons

Photo: Jesse Gardner/Unsplash

A pool house can be completely customized to your needs. For many, simple storage is fine, but others may want a bathroom to keep family or guests from entering the house while dripping wet.

Pool House With Bathroom Cost

Installing a bathroom in a pool house costs $15,000 to $35,000 on average. This project will require plumbing, electrical work, and adding fixtures like a toilet and shower. Adding a walk-in shower costs $750 to $6,850, and a new toilet costs around $373


Installing a bar in a pool house costs about $2,000 to $4,000 on average and allows you to easily mix up drinks for guests to enjoy by the pool. 

  • Sink: A new sink starts at $100 for a basic model and professional installation.

  • Fridge: A new fridge to keep beverages and snacks chilled will cost $190 to $3,250 depending on the size and model.

  • Plumbing: Installing new pipes costs at least $1,500.

Full Kitchen 

Adding a full kitchen, complete with a fridge and oven, costs $5,000 to over $125,000 depending on the size and materials you want to include. Refrigerator installation costs range from $600 to $3,250 including labor, while a mini-fridge is usually between $190 and $470. An oven and stove cost $510 to $8,000

You’ll also need to factor in plumbing, at least $1,500, and installing new electrical wiring costs, which run about $1,410. Lights, tiles, flooring, and cabinets are additional factors to consider.

Outdoor Shower

An outdoor shower costs $1,000 to $8,000. Wall-mounted showers are the least expensive, while a standalone shower near the pool house costs more. The price depends on the materials you choose, such as the showerhead and knobs, as well as how easy or difficult it is to hook up to the property’s plumbing.

Pool House DIY vs. Pro

You can save between 30% and 60% of the total project cost by building a pool house yourself, but you shouldn’t attempt to build a customized pool house on your own. If you have construction experience, you can safely build a shed or prefab pool house kit. Even these types of structures require foundations, and if you want to add plumbing or electricity, you’ll need to consult professionals to avoid safety risks and costly damage. You can hire a general contractor to build a pool house. 


Does a pool house have a good ROI?

A pool house has about 5% to 8% ROI. While this isn’t a lot, you should consider a pool house if it suits your lifestyle. If you love entertaining, need a space to store pool toys and accessories, or are simply tired of mopping after kids come in the house dripping wet when they want snacks, building a pool house is a good option.

What is the common pool house size?

Most pool houses can range from 100 square feet to 800 square feet. Smaller pool houses are about 100 to 150 square feet, while a spacious pool house is at least 300 square feet.

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Related Projects Costs

  • Build a Pool Deck
  • Build a House
  • Build a Swimming Pool
  • Build a Swimming Pool Enclosure
  • How Much Does It Cost To Install A Pool Fence?
  • Build a Barn, Shed or Playhouse
  • Build a Dock
  • Build a Garage
  • Build a Guest House
  • Build a Modular Home

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House Extensions Prices Long Island

Are you thinking about extending your house? You might be too excited to get started with this project, but you must be careful especially when it comes to setting your budget. A home extension on Long Island can be costly, but it often adds value to your home, allowing you to generate a good return on your investment. The problem, however, is that home extension pricing can vary widely. You must consider your particular requirements with the help of an expert to ensure that you don’t go beyond your budget. 

The scope of the project is a huge factor when determining how much money you need to invest. If you only need to extend a single room, then the average price is about $80 to $250 per square foot. The costs go up if you need more than just the basic foundation. But if you also need additional plumbing, internal finishing, heating or cooling, and other structural changes, then expect the price to shoot up considerably.

For framing expenses, the average price falls between $6 to $12 per square foot. This includes building extra walls and adding a roof. Note that this price doesn’t include new doors and windows, insulation, utilities, drywall, and finishing trim. Depending on the things you want to have, it can cost thousands for framing of a single average-size bedroom with quality material and craftsmanship.

Things get a little complicated when it comes to extending your home with a new kitchen. Obviously, this project requires plumbing. But you also shouldn’t forget about boost costs. Your new kitchen addition can cost you about a few hundred dollars per square foot. Take note that this doesn’t include appliances and countertops, which could easily add up to thousands of dollars.

Plumbing is also required for a bathroom extension. However, the price per square foot will be much lower. Expect to pay about $250 to $300, about half the cost of a kitchen extension. Again, there are cost variables that can drive up expenses including the bathroom layout, type of flooring, custom lighting, shower, and other fixtures. You really need an on premise measurement and sit down with a reputable and experienced contractor to get a real ball park cost of what your project will cost.

As you can imagine, there’s a whole lot of variables to take into consideration when preparing your budget. It’s recommended to set aside a specific budget for your home extension project, but be prepared to do some adjustments as you get down to the details. This doesn’t mean you should always make more room for your budget. It should also mean finding ways to save more money, such as by repurposing old materials and avoiding the temptation of replacing appliances and fixtures that still work just fine.

To help give you a better picture of how much you need to shell out, consider using online home extension calculators. You’ll easily find one with a quick online search. This tool provides you with a rough estimate of the project. It lets you enter the details of the home renovation and calculates how much it will cost you based on national averages. If you also need home addition ideas you can do a quick google search or check out HGTV.

Of course, these calculators can only take you so far. They’re useful in some cases, but you can’t expect to get accurate calculations. For this reason, it’s recommended to seek help from professionals. Start your search for home extension specialists in your Local Long Island area. Working with professionals allows you to feel more confident knowing that you’ll be guided throughout the process, from selecting the bets materials to use and using the best construction methods that maximize durability and functionality without driving up prices too high.

There are plenty of renovation contractors to choose from on Long Island, so you must spend time narrowing down your list. You can’t pick a company blindly. At C&S we encourage you to do your due diligence on any company including us.  Do a lot of research to learn about the kind of reputation the company has in the industry. It’s also worth reading online reviews to see what their past clients have to share about their experience. Better yet, try to get referrals from friends and family. They should be able to provide an honest feedback about a particular company, making it easier for you to come up with an informed decision.

When it comes to price, you might be surprised that the rates of different contractors vary widely. Some charge too high, while others charge too low. It can be confusing to determine what contractor to trust. It helps to get written estimates from all the contractors you’re considering. Make sure that the estimate includes all the details of the project, from labor costs to material expenses. You can then determine which ones charge reasonably for their services.

Preparing for a Long Island home extension pricing can be challenging, with a plethora of variables that drive the total cost up or down. But with enough research and patience, you should be able to find the right contractor that helps you achieve your dream home without requiring you to spend more than what you can afford.

Feel free to reach out to us with any questions you may have about a future project you are looking to accomplish. We are here to help!

Adding a veranda to a wooden house in Moscow and the Moscow region

Building a house with a veranda or completing it during renovation helps to expand the usable area, improves the appearance, making the architecture more complex and interesting, and protects the adjoining walls from adverse weather effects. Unlike a terrace, this is a capital residential building with walls and a roof. We carry out the extension of the veranda to the house on the basis of the agreed project documentation and in accordance with the current SNiPs. Our team consists of qualified builders and designers who will help you create the perfect veranda.


Open. Designed for operation in the warm season. External fences are usually represented by lightweight unglazed structures without protection from wind and freezing temperatures. Outdoor verandas are used as a summer kitchen, outdoor seating or play area for children. The implementation of such a project does not take much time and is distinguished by an affordable cost. Open verandas are often built from timber, polycarbonate, and sheathing boards. A light frame made of wood or metal structures reduces the load on the foundation. The roof can be flat or pitched, including being a continuation of the roof of the house.

Closed. This extension logically continues and expands the living space of the house. Enclosing structures are made of building materials similar to the walls of the main building, or are built from materials combined with it. So, closed glazed wooden verandas are often attached to brick houses. External walls can be blank, with panoramic or regular windows, with hinged, sliding or sliding patio doors. Covered verandas can be used as:

  • dining room combined with the kitchen of the house;
  • greenhouse with access from the living room;
  • gym;
  • recreation areas;
  • office or library;
  • game room;
  • billiard room, etc.

This type of extension can be glazed cold or warm. In the latter case, you will need to additionally insulate the room and install a heater in order to use the veranda all year round. During construction, you can choose any wall material: ceramic or silicate bricks, aerated concrete, foam blocks, cinder blocks, profiled or ordinary timber. Building materials must have good thermal characteristics, be moisture and frost resistant.

Designing a veranda

When developing a project, we take into account:

  • the layout of a country house;
  • soil specifics;
  • features of the landscape of the personal plot;
  • fire safety requirements;
  • climatic features – wind and snow load, temperature changes;
  • building codes;
  • type and reliability of the foundation of the house, as well as other important parameters.

We build extensions of any size and architectural style, from constructivism and hi-tech to classicism and modern. You only need to tell us about your wishes or show us an example of a project that interests you. After you agree on the draft plans and other documentation, we proceed to the delivery of building materials and the construction of the veranda.

Stages of construction

Depending on the material and type of the veranda, it is possible to arrange a strip, column or pile foundation. The depth of penetration is calculated individually. The structures are connected by movable links, since the shrinkage rate of structures with different masses is different. Construction is carried out in several stages.

  1. Frame is being installed or external walls are being built.
  2. The ceiling slab and roof batten are being formed.
  3. Waterproofing and roofing material is laid on the crate.
  4. Set up the floor and lay the floor covering.
  5. During the construction of a warm veranda, thermal insulation of enclosing structures and installation of glazing are carried out.
  6. Finishing work in progress.

After completion of the work, the blind area of ​​the extension and the house are combined, and a drainage system from the new roof is equipped. The verandas designed and built by us will harmoniously fit into the landscape of your personal plot, give it a uniqueness and serve you for many years. All work is guaranteed. You can order an extension of the veranda to the house from any building materials by phone or through the website.

Extension to the house – materials, cost of services

Quite recently your housing seemed quite acceptable in size, but now there is a need to expand the living area, build a warm terrace or a winter garden. There are many reasons why an extension to the house is being carried out, as well as options for using additional space. But in any case, an accurate calculation of the interface between the main building and the extension is required, the determination of the parameters of the room, based on its operational features.


  • 1 Building materials for extensions to the house
  • 2 How to “tie” the extension to the house
    • 2.1 Rigid connection of foundations
    • 2.2 Connection of foundations through a deformation seam
    • 2 .3 Attaching the walls of the extension
    • 2.4 Roof and extension to to a private house
  • 3 Construction errors in the construction of an extension to a private house

Building materials for extensions to a house

The building industry does not restrict building owners in the choice of materials for the implementation of projects and interior decoration. The main demand is directed to the purchase of large-format masonry elements such as blocks of aerated concrete or foam concrete for the construction of extensions, but frame structures are no less in demand. In a number of regions, it is frames that are quickly assembled that are in the lead, and in terms of consumer characteristics, thanks to the use of heaters, they are not inferior to capital buildings.

Tip. If the building and the extension to the private house will not be sheathed, then it is recommended to use the same material as the material used for the main building.

In connection with the development of frame technology, the use of timber for extensions to a wooden house has significantly decreased. Firstly, the beam requires maintenance, since during operation the tree “breathes”, there are movements that need to be compensated for with an additional caulk of grooves. Secondly, sheathing and insulation of timber is the creation of the same “sandwich” frame, only with a wooden core and with a significant overpayment for solid wood.

How to “tie” an extension to your house

Building experts advise building a foundation for an extension that will fit the existing foundation. Of course, there is always a desire to save money and put an unburied tape for the veranda next to the deepened monolithic foundation, be content with piles or pillars.

But the bottom line is that under the house there is not a basalt slab, but soil, which has seasonal changes. Accordingly, each type of foundation will behave differently. Uneven shrinkage, heaving and movement of the soil can play a cruel joke, and the additional foundation will go to the side, breaking the connection between the walls.

Tip. Only identical bases ensure the stability of the extension relative to the main building.

The foundation for the extension is available in two versions:

  • Rigid connection;
  • Connection of bases through a deformation seam.

Rigid connection of foundations

Rigid connection is justified if the soil on the site is homogeneous and it is necessary to build an extension of more than one floor with a common roof with the building. The implementation of the project requires professional knowledge and research of the soil in the place of the proposed additional premises.

  1. Connection of strip foundations. The connection between the foundation of the extension and the main building is carried out using the reinforced connection method. A trench is dug to the depth of the existing foundation, the end of the foundation is cleaned and markings are made for inserting reinforcement bars. According to the marking, holes are drilled for the diameter of the reinforcement. In the corners of the base, the depth of the holes is at least 50 cm, and in the middle part of the tape, holes are made with a depth of at least ¾ of its thickness. On the outlets of the reinforcement driven into the base, a frame is formed for pouring concrete. The reinforcement in the corners of the foundation is welded to the reinforcement of the future base, where the frame is also created.
  2. Joining slab foundations. This connection can only be realized if the slab under the house protrudes from the wall by at least 30 cm and has a thickness of at least 40 cm.

There is a compromise option when the foundations are rigidly connected with reinforcement, but have a small gap filled with elastic building materials.

Let us remind you that only specialists in the field of construction with the necessary knowledge and practical experience should carry out calculations and the necessary work.

Connection of foundations through a deformation joint

Without data on the existing foundation, we can only give general recommendations that apply when building an additional foundation. In most cases, the foundation for an extension is made according to the type of a closed base. Thus, uneven shrinkage along the horizon is excluded.

The expansion joint has a width of 10-25 mm and is filled with fiber insulation. Building foam is not used, as there is a possibility of its destruction during operation. The insulation is protected by waterproofing or a special weather-resistant plastic sealant for facades is used.

Anchoring the walls of the extension

Additional premises to a brick house or from other masonry materials are built in four walls. Subject to the conditions for performing foundation work and proper masonry while maintaining the level, a good and even seam is obtained. If the gap between the walls is insulated, then the thickness of the adjoining wall is made smaller, which makes it possible to realize reasonable savings.

Sliding joints are used on the frame technology extension to the house. Vertical bars are fixed, which play the role of guides for the vertical bar of the extension. Profiled timber or logs are connected to the existing wall with galvanized iron corners, which are fastened with self-tapping screws with a slight shrinkage play. The seams between the walls are closed with a platband.

Expansion joint (sedimentary) runs throughout the building and extension through the foundation to the very top. He admits that the buildings will have different vertical shrinkage on their own.

Roof and extension to a private house

When the foundations and walls are rigidly connected, the extension is carried out under a common roof with the building. In the presence of a deformation (shrinkage) seam, the extension is covered separately, and an elastic sealant is used for the joints.

Construction errors during the construction of an extension to a private house

Lack of preparatory work leads to the fact that builders make elementary mistakes. Experts advise approaching any construction with the utmost responsibility and listening to the advice of specialists.

  1. No building project. Even a simple project, a sketch on paper, will allow you to understand what you want to implement as an extension to the house. For example, you wanted to build a veranda using frame technology. But already after the foundation was poured, they changed their mind and decided to make a capital building out of blocks. In this case, a more powerful base and at least a complete rework will be required.
  2. No soil survey. This item may not be necessary for the construction of a veranda, but a heavy residential extension to a private house, placed on the ground with high groundwater, will “leave” to the side or settle to a significant amount.
  3. Wrong choice of materials. This is especially true for multilayer structures. An error in the insulation or vapor barrier will lead to rotting of buildings or blowing through the entire room.