How much does radon mitigation cost in Portsmouth, NH?

Most Portsmouth homeowners spend between $1,100 – $3,050 on radon mitigation, with an average around $2,050. Local labor prices 22% above the national average, so Portsmouth quotes tend to land at the higher end of national ranges.

Why is radon mitigation more or less expensive in Portsmouth than elsewhere?

Licensed trade labor in Portsmouth runs about 122% of the national average, and the best crews book out fastest in spring and early summer. New Hampshire weather drives material choices here, so ask contractors what they install most often in Portsmouth and why.

Do I need a permit for radon mitigation in Portsmouth, New Hampshire?

Most Portsmouth, NH projects that change structure, electrical, plumbing or mechanical systems need a permit from the local building department; cosmetic work usually does not. Always confirm current requirements with the local building department before signing a contract, and make sure the permit is pulled by your licensed contractor.

How many quotes should I get in Portsmouth?

Get at least three written quotes from licensed, insured New Hampshire contractors. Comparing line items — not just the bottom line — is the fastest way to spot an inflated bid in the Portsmouth metro market.

How much does radon mitigation cost in 2026?

Most homeowners pay between $900 and $2,500, with a national average near $1,700. Small, simple jobs land at the low end; large or premium-material jobs run well above the high end.

What is the cost per system?

Installed pricing usually runs $900.00 to $2,500.00 per system, including labor and materials. Expensive metros can run 15–45% higher than that range.

What drives the price up the most?

Scope and access. Larger quantities lower your per-system price, but difficult access, demolition of existing work, structural repairs found mid-job, premium materials and rush scheduling each add 8–30%.

Permits are typically required when the work changes structure or ties into electrical, plumbing, gas or mechanical systems. Budget $75–$600 in most cities and confirm whether your contractor pulls it — unpermitted work can block a future home sale.

How long does the job take?

Most residential projects of this type finish in one to five working days once materials are on site. Custom orders, inspections and weather are the usual causes of delay.

How many quotes should I get?

Three. Bids on the same scope commonly vary 20–40%, and the middle bid with the strongest warranty and references is usually the best value — the cheapest bid often excludes prep, disposal or permits.

Home/Cost guides/Radon Mitigation/Portsmouth, NH

Portsmouth metro · New Hampshire

Radon Mitigation cost in Portsmouth, NH

Portsmouth homeowners typically pay $1,100 – $3,050 for radon mitigation. Local labor and materials price 22% above the national average.

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Portsmouth average

$2,050

Typical low

$1,100

Typical high

$3,050

Per system

$1,100 – $3,050

Sample ZIP

What drives Portsmouth pricing

Local labor

Licensed trade labor in Portsmouth runs about 122% of the national average, and the best crews book out fastest in spring and early summer.

Permits & code

Most Portsmouth, NH projects that change structure, electrical, plumbing or mechanical systems need a permit from the local building department; cosmetic work usually does not.

Climate & conditions

New Hampshire weather drives material choices here, so ask contractors what they install most often in Portsmouth and why.

Instant cost calculator

Adjust the inputs to see live pricing

Number of suction points1 system

Quality / material level

Site access

Removal / prep work

Timing

Estimated project cost

$1,235 – $1,663

Most homeowners pay around $1,449

Compare quality / material level

Cost by material in Portsmouth

Installed Portsmouth pricing per system.

Option	Installed cost	Pros	Cons
Single-point sub-slab system	$1,300 – $1,750	—	—
Sub-slab with sealing	$1,750 – $2,300	—	—
Crawlspace membrane system	$2,300 – $3,000	—	—
Multi-point system with monitoring	$3,000 – $4,150	—	—

Where the money goes in Portsmouth

A typical $2,050 Portsmouth project, broken down by line item.

Labor0.45% · $9
Materials0.38% · $8
Permits & inspections0.05% · $1
Overhead & profit0.12% · $2

Common add-ons

Extras that show up on Portsmouth quotes but rarely in the headline price.

Post-mitigation testing

$185 – $365

Crawlspace vapor barrier

$1,850 – $6,100

Sump pit sealing

$245 – $975

Continuous radon monitor

$185 – $490

Ways to save in Portsmouth

Test first with a $20 kit before commissioning a system.
Route the pipe on the least visible elevation to skip cosmetic upgrades.
Collect three written bids on an identical scope — spreads of 20–40% are normal.
Book in the off-season and stay flexible on the start date to save 5–15%.
Bundle nearby work into one mobilization so you only pay setup and travel once.
Ask what the contractor would change to cut 10% without hurting durability.

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More Portsmouth research

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