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How Much Does a Radon Mitigation System Cost in Seattle? [2026 Data]
Radon detection and reduction costs depend on your project and location. Check with a local pro for your specific job.
Get quotes from radon detection and reduction specialists near you
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Get quotes from radon detection and reduction specialists near you
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Cost Insights
Mitigation for Seattle homes built more than 30 years ago may cost more than $1,400.
In Seattle, radon remediation costs $0.60 to $1.10 per square foot of house.
Permits from the city and King County for this work will cost $25 to $240.
Radon mitigation is less common in Seattle compared to other cities, so this project won’t have much effect on home values.
Radon mitigation in Seattle, WA, costs $1,397 on average, with most homeowners here spending between $943 and $1,852, depending on what type of system you’re installing as well as the size and age of your home. Permits, labor, and extended warranties can increase the cost of this project, but pro installation is essential in limiting this cancer-causing gas from entering your home at high levels.
Fortunately for Seattle residents, though, high radon levels are less common in homes here compared to the Northeast or Midwest, but regular testing remains important in keeping your family safe.
Radon Mitigation Cost Factors
Radon mitigation costs in Seattle, WA, vary primarily based on what method you’re using, but project totals can also depend on home size and age.
Cost by Method
The cost of a radon mitigation system depends on the chosen approach, which might be sealing the basement, depressurization, or lower-level pressurization. The depressurization method happens in one of two types: active suction (soil depressurization) or passive depressurization.
Here’s what to expect for pricing by radon mitigation method:
| Method | Cost Range in Seattle, WA | Description |
|---|---|---|
| Sealing the basement | $400–$4,600 | Half as effective; may require repeated resealing |
| Active suction soil depressurization | $1,000–$3,000 | Most common method; PVC pipe suctions gas from beneath foundation |
| Passive depressurization | $500–$2,500 | Vents radon through PVC piping using pressure differences; low efficiency at high levels |
| Wall-based systems | $500–$3,000 | Cinder block wall creates vented cavity to exhaust radon |
| Ventilation systems | $1,300–$2,500 | Two fans remove radon and vent it outside |
| Water mitigation | $1,200–$5,000 | Uses carbon and aeration to remove radon from water |
Cost by Home Size
The average Seattle home is 1,800 square feet, and radon mitigation costs between $943 and $1,852 on average for a home of this size. Radon mitigation costs $0.60 to $1.10 per square foot of house, so here’s what you can expect to spend based on the size of your home.
| Home Size (Sq. Ft.) | Average Cost |
|---|---|
| 1,500 | $900–$1,650 |
| 1,800 | $943–$1,852 |
| 2,000 | $1,200–$2,200 |
| 2,500 | $1,500–$2,750 |
| 3,000 | $1,800–$3,300 |
Cost by Home Age
Older homes can be more challenging to install a radon mitigation system in, which means radon mitigation systems in homes built more than 30 years ago will cost more compared to those in newer builds. Here’s how much to budget for radon mitigation based on the age of your home:
| Home Age | Average Cost |
|---|---|
| New construction | $670–$950 |
| Young (under 30 years) | $950–$1,400 |
| Old (31+ years) | $1,400–$2,330 |
Radon Mitigation Pro Costs
Radon is an odorless, colorless gas that, with extended exposure, can cause cancer. According to the U.S. Environmental Protection Agency, radon exposure is the second-leading cause of lung cancer in the U.S., which is why radon mitigation system installation should always be left to the pros.
Let a radon testing pro in Seattle, WA, inspect your home for radon, make recommendations based on your home’s layout and age, and install the mitigation system to ensure your family’s safety.
Labor
Most contractors will charge a total project rate, rather than an hourly rate, for radon mitigation system installation. However, you can estimate that this work will cost $50 to $100 per hour, per worker.
Permit
Permits for this work range from $25 to $240. Your contractor will handle the process of acquiring the appropriate permits from the Seattle Department of Construction and Inspections, depending on what type of radon mitigation system they’re installing.
Warranty
Once your new radon mitigation system is installed, you may want to consider springing for extended warranty coverage to cover potential repairs. Your system fan often includes a five-year warranty, but you can extend it for an additional five years for $200 to $500. Most fans last 10 to 15 years, so this added protection could save you on fan repair and replacement costs.
Additional Pros to Consider Hiring
In addition to specialized radon remediation pros, you may also need to tap other experts in electrical, foundation repair, and other fields to complete your radiation mitigation system. Here are the average costs to hire the following pros in Seattle:
Electrician costs: $200–$650
Basement finishing costs: $2,800–$100,000
Foundation repair costs: $2,625–$10,470
Does a Radon Mitigation System Increase Home Value?
Radon exposure from soil is a lower risk in Seattle compared to homes in the Northeast or Midwest, so a radon mitigation system won’t have much impact on your home value. However, if your home does test for higher radon levels, a mitigation system is essential for the safety of your family or future homeowners of your property. Having a well-maintained radon mitigation system, in that instance, would maintain your home value rather than lead to a decrease due to high radon levels.
How Angi Gets Its Cost Data
Home is the most important place on earth, which is why Angi has helped more than 150 million homeowners transform their houses into homes they adore. To help homeowners with their next project, Angi provides readers with the most accurate cost data and upholds strict editorial standards. We survey real Angi customers about their project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We pair this data with research from reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects.
Want to help us improve our cost data? Send us a recent project quote to [email protected]. Quotes and personal information will not be shared publicly.
Radon detection and reduction services reviews from real Angi homeowners in Seattle, WA
Last update on October 10, 2024
- Tracy K.
They were efficient and effective! Our little yard was overrun with horsetail and we couldnâ t see anything else. They saved all of our ferns and shrubs and were here and gone before we knew it! I recommend for sure.
Garcia Landscaping - Paul K.
Collin did a great job removing grape vines with deep sprout, blackberry bushes and small trees. His price was the best and we plan to use him again. He is flexible and communicate well.
- James S.
EP Garden did a fantastic job removing all the leaves and seasonal debris from my property and two adjacent properties. I was unsure they'd be able to complete the job with so little daylight left and such a large project area, but they completed it on time and on-budget. Thorough and...
EP Garden and Landscaping - Alexandra G.
Efficient and safe removal of asbestos tape in and on my hvac
4 Aces Restoration LLC - Venkatesh M.
Great work, punctual and clean and they went above and beyond to help address concerns and needs
- Warren V.
Very knowledgable and even helped with removing washer out of unit. Would recommend!
NRM & Family Appliance - Heathere D.
Tal inspected my fire place and gave me great advice and information, on how and what to do, i will be using Chimney sweeping in the future as required.
United Home Services - Ethan L.
My installers Fernando Guzman and Darivs Akana did a great job replacing my very old windows. I am used to having to clean up after contractors but it was not the case with Renewal. The windows look great and I really enjoying to significate noise reduction they bring.
Renewal by Andersen of Washington - Lawrence C.
The owner and all the employees were polite and professional. Great company and Michael the owner was always attentive throughout the job.
United Home Services 2 - Liz W.
Jessy, David and Gustavo came out today and were absolutely amazing! All done in one day and my chimney looks brand new! Clean and efficient! Very friendly and would highly recommend! Great job guys!
United Home Services
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