# How Much Does Radon Mitigation Cost in St. Louis?

Crews serving St. Louis quote radon mitigation anywhere from $2,000 to $20,000 per job; the middle of the pack is about $11,000.

Last updated: October 5, 2026

The Missouri market sets a baseline, but St. Louis neighbourhoods vary. Access, parking and the age of the building can each add to a undefined bill.

Benchmarked against 2 nearby cities in Missouri.

## Radon mitigation cost breakdown

- Low: $2,000
- High: $20,000
- Typical: $11,000
- Unit: per job

| Scope | Low | High | Typical | Unit |
| --- | --- | --- | --- | --- |
| radon mitigation system installation | $1,000 | $5,000 | $3,000 | per job |
| radon testing | $50.00 | $500 | $275 | per job |
| crawlspace encapsulation | $3,000 | $20,000 | $11,500 | per job |

## Radon mitigation cost guide

### What radon mitigation covers

Most radon mitigation bills come down to labour, the materials or parts, and any follow-up visit. Two providers can describe the same radon mitigation differently, so compare the pieces rather than the headline total.

Because two providers can describe the same radon mitigation in different ways, ask each one to break the total into the same line items before you compare them.

### Choosing a contractor for radon mitigation

Check any required licence with the regulator, ask to see current insurance, and get the full scope in writing before you commit.

Ask for two recent local jobs you can call, and read the written scope for what it leaves out as carefully as what it includes.

### The things that move a radon mitigation price

The scale of the work, the grade of materials, how easy the work area is to reach, permit requirements and how quickly you need it finished.

Geography plays a part as well. Remote markets tend to add travel time, while crowded cities add access, parking and permit costs.

### Ways to keep radon mitigation costs down

Gather two or three written quotes, compare the individual lines rather than the total, and ask whether paying in full lowers the price.

When the work can be scheduled, moving it out of the busiest season usually lowers the bill. Ask whether a bundle or off-peak rate exists.

## Nearby cities

- [Independence](https://currentcosts.com/independence/radon-mitigation/)
- [Kansas City](https://currentcosts.com/kansas-city/radon-mitigation/)

## Related cost guides

- [Water Treatment costs](https://currentcosts.com/water-softener/)
- [Roofing costs](https://currentcosts.com/roofing/)
- [Concrete costs](https://currentcosts.com/concrete/)
- [Window costs](https://currentcosts.com/window/)
- [Heating and Cooling costs](https://currentcosts.com/hvac/)
- [Pool costs](https://currentcosts.com/pool/)

## Frequently asked questions

### What should I budget for radon mitigation?

Plan around $11,000 for a typical radon mitigation, with most cases landing between $2,000 and $20,000 (per job). Those are planning figures rather than a quotation.

### Which parts of a radon mitigation bill move the most?

The scale of the work, the grade of materials, how easy the work area is to reach, permit requirements and how quickly you need it finished. That is why the same job can produce two very different totals.

### What is the smartest way to lower radon mitigation costs?

Line up two or three written quotes, compare the line items rather than the totals, ask about a paid-in-full discount, and schedule outside the busiest period when you can.

### What should I verify before hiring a contractor?

Confirm any required licence or registration with the regulator, ask for current insurance, and speak to two recent local customers. Then read the quote for the exclusions.

Source: https://currentcosts.com/st-louis/radon-mitigation/