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How Much Does It Cost To Install A Foundation?

National Average Change Location | View National
Typical Range
$4,054 - $11,875
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The average national cost of building a foundation is $7,771, with most homeowners spending between $4,054 and $11,875. This data is based on actual project costs as reported by HomeAdvisor members.

Any structure, whether a house, a garage, or workshop, is only as strong as its foundation. The better educated you are about types of foundations and how best to plan your foundation, the better you can work with your contractor to create the best foundation for your structure at the best price. Here are a few things that will affect the cost of building a foundation.

Types of Foundation

Most foundations are defined as deep or shallow. A shallow design foundation is set about three feet into the soil, with concrete pads extending below the frost line, transferring load from the walls to the earth. Another type of shallow foundation is called slab-on-grade. This type transfers load to the earth through a slab of concrete.
A deep foundation is used when soil conditions are more difficult, like building on the side of a hill, or if the structure must be raised to prevent flooding. Deep foundations can be made from steel, wood, reinforced or pre-tensioned concrete. A deep foundation sometimes will penetrate the bedrock, so it is good to bring in a structural engineer in these cases.
In most cases a deep foundation will be more costly than a shallow one. It requires more materials, more excavation, and more labor.

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Planning the Foundation

Laying a foundation requires a plan. You will have to adhere to local building codes and have inspections from the city or county while you build. So it is important to follow local codes and get the correct permits in advance. You may also need to have soil or seismic reports as well. Even though getting these reports can add cost to your foundation installation, it is essential that you do this and it can save you a lot of money in the long run. If you begin to build a foundation and find out half way through for whatever reason that you cannot continue, the costs could be huge. An experienced contractor will be able to help you with this, or obtain the correct permits for you.

Drainage and Radiant Heat

If you plan on adding features like a filtered drainage system and radiant floor heating, these will need to be installed during construction of the foundation. Drainage pipes and radiant heat tubes should be placed before pouring your concrete slab. So planning these features in advance is a necessity! Both these features are expensive but close to impossible to add later on and will add value to your home. So it may well be worth the extra costs upfront.

Sealing Concrete Slab

If you are building a garage or workshop space, you will need to seal your concrete slab to inhibit moisture, cold or hot air, and particles. There are two commonly used types of sealers; floor sealers and sill sealers. The sealers are normally applied during the construction to help keep your garage or workshop dry and well insulated.
Sill sealers use adhesive foam and the application will sit between the top of the foundation and sill plate, creating a waterproof barrier.
Typically, concrete sealers are spray on applications designed to prevent moisture and vapor from rising up through concrete, which is porous. Concrete sealers can provide other benefits as well, including preventing radon gas seepage and inhibiting the growth of mildew or molds. Concrete sealers can also help strengthen concrete and prevent cracks over time.
Adding a concrete sealer at the time your foundation is being constructed is relatively low cost compared to the benefits it will give you in the long run.

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Beverley Hagaman More than 1 year ago
You give an average overall  but absolutely no specifics.  I am looking to find out approximately what is the cost per square foot for my particular project without having an on site estimate.  What good is the general estimate amount.  What size of job does it  represent.
lc kazco More than 1 year ago
How big or small is the size of these cost averages?  This "estimate" is useless.
David Keear More than 1 year ago
I found the information to be good over all,  One item that I found omitted in the sealer portion, was that some county areas require a "moisture barrier" between the ground, or gravel base and the concrete pour.  Is this a good item to add to your "sealer" article, or was I too obtuse.?
Lawrence Elow More than 1 year ago
All we need is an 8 inch wide rectangular cement footing, About 8' by 14' , so a wooden fence can rest on the cement.
Thomas Martone More than 1 year ago
Good overview, but I am going to need much more specific info. to build on a steep slope and to be able to cantilever part of the house over the edge.

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  1. Homeowners visit to find a top-rated pro to complete their home improvement project or repair.

  2. Once their projects are completed, the members log in to their accounts and complete a short cost survey.

  3. After compiling and organizing the data, we report it back to you.