Find a foundation contractor in Seattle, WA

Find foundation companies in Seattle, WA

Find foundation companies in Seattle, WA

Share a few details and we'll show you the best foundation contractors in your area.
Zip code

Find foundation companies in Seattle, WA

Share a few details and we'll show you the best foundation contractors in your area.
Zip code

Top 10 foundation contractors in Seattle, WA

Homeowners agree: these Seattle foundation companies are highly rated for knowledge, experience, communication, and more.
Rose Gold Construction Llc

Rose Gold Construction Llc

5.0(2)
5+ years in business
Serves Seattle, WA
Marangelys C. says, "I was seeking services to get my Driveway it was a lot of work but at the end I was more the happy with you’re guys work I loved the Diamond cut finish in my driveway. Looks beautiful" Read more
Leslie Concrete

Leslie Concrete

New on HomeGuide
1 hire on HomeGuide
14+ years in business
Serves Seattle, WA
Hello, we want to introduce the community with my excellent skills in concrete construction. We have free Estimates and offer the best pricing for a win to win transaction. I have over a 4 and a half star rating guiding the owner with exceptional sale rates on the market. Besides owning a wide spectrum of tools, I own big power tools like the bob cat to do all the heavy digging. I have precise high quality results to do the details with plenty of different shovels, a level measurement to have the whole perimeter even looking straight. We go from replacing old concrete to install new gravel, trench digging to replace the dirt, and doing jobs t...
Wafa Masonry

Wafa Masonry

New on HomeGuide
1 hire on HomeGuide
24+ years in business
Serves Seattle, WA
20 years experience licensed bonded insured ›Build and Repair Services ›Chimney & Fire place, Chimney sweeps, ›Brick, Block, Culture Stone ›Pavers, Retaining wall ›Tiles, Marbles, Ceramic, pressure washing ›And much more in your Home build or repair...

Your Foundation Contractors questions, answered

Answers to commonly asked questions from the experts on HomeGuide.

How much does it cost to install a foundation?

The cost to install a foundation depends on the type of foundation installed. The most common types of foundations are concrete slabs, pier and beam, crawl space, and basement foundations.

  • A concrete slab foundation costs about $6 to $12 per square foot for a single, poured concrete slab that rests on the ground.
  • A pier and beam foundation costs $8 to $15 per square foot and is made up of concrete or metal piers supported by beams. These foundations are common in areas with sandy or unstable soil.
  • A crawl space foundation costs $15 to $18 per square foot for the elevated foundation with enough space to crawl through. These foundations are common in warmer climates where the frost line is not deep or on sloping lots since they don't require as much excavation as other foundations.
  • A basement foundation is the most expensive at $35 to $50 per square foot. This foundation provides the most space and flexibility. A finished basement foundation can double the living space of a home.

Do you install septic before a foundation?

Yes, you generally install the septic system before pouring the foundation for a new home. The leach field and septic tank need to be located in a specific area of the property and this is easier to do before the foundation is in place. Installing septic first also allows you to have water available on-site during construction.

How much does it cost to fill in a crawl space?

Filling in a crawl space or crawl space encapsulation costs $3,000 to $8,000. Prices include basic cleaning, minor repairs, mold removal, and installing a vapor barrier, a sump pump, new insulation, and a dehumidifier. The total project cost depends on the condition and size of your crawl space, the type of insulation you choose, the thickness of the vapor barrier, and the pump and dehumidifier installed.

Crawl space encapsulation prevents excess moisture, mold growth, radon gas poisoning, and pest infestation. The process also helps alleviate allergens and pollutants to improve air quality. Another benefit of crawl space encapsulation is better insulation that can reduce energy bills by up to 20%.

How long does a poured concrete foundation last?

A poured concrete foundation can last for 80-100 years or more if it is properly constructed and well-maintained. However, a number of factors can affect the lifespan of a concrete foundation, including the quality of the concrete mix and the workmanship, the climate and soil conditions, and the amount of weight the foundation is supporting.

Some of the most common reasons a foundation fails include:

  • Poor drainage
  • Frost heave
  • Tree root invasion
  • Earthquakes and other seismic activity

How deep does a concrete foundation need to be?

Generally, a concrete foundation needs to be at least 12 inches deep to ensure the foundation is below the frost line and can support the weight of the structure. In some cases, a deeper foundation is required. If you are building in an area with a high frost line, poor soil quality, or building a very heavy structure, you may need to dig deeper.

A qualified structural engineer can help determine the appropriate depth for your concrete foundation.

What questions should I ask a foundation contractor?

Here are some questions you can ask a foundation contractor to ensure you are making the best choice for your project:

  • Is your company licensed, bonded, and insured for foundations?
  • How long have you been pouring foundations in my area?
  • What experience do you have installing my preferred foundation type?
  • What does your estimate include?
  • How long will the foundation take to install?
  • Do you have past clients I can contact or a current job site I can visit?
  • Do you offer a written estimate, contract, and timeline for the job?
  • What happens if the foundation is delayed due to weather or other unforeseen circumstances?

How do I choose a foundation contractor?

Selecting and pouring a foundation is one of the most important steps in building your new home. Choose the best foundation contractor by following these steps:

  • Get at least 3 estimates with the same foundation type to compare costs.
  • Confirm the contractor's experience with your preferred type of foundation.
  • Make sure the contractor is licensed, bonded, and insured, with 5 years of experience.
  • Look for foundation contractors with good reviews on HomeGuide and Google.
  • Ask for references from past clients and follow up to get their opinion on the work quality.
  • Confirm if the estimate includes labor, materials, and equipment costs.
  • Ask for a contract in writing that includes the costs, timeline, and warranty information.

Reviews for Seattle foundation contractors

Recent success stories from people in the Seattle area.
Emily D.
They where awesome from start to finish, they communicated with me on everything that was going to be done and answered any questions I had, we had such a good experience with Rose Gold Construction 10/10 would recommend them
Rose Gold Construction llc
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