Philadelphia, Pennsylvania · 2026 pricing
Radon mitigation cost in Philadelphia
A typical sub-slab system in an 1,800 sqft full-basement home at 6 pCi/L in Philadelphia: $1,481–$4,364 · metro cost factor 1.23× vs. US average (state factor 1.10× · metro overlay 1.12×).
Radon Mitigation Cost Calculator
Estimated cost
$1,113–$3,479
Typical: $2,087 · state factor 1.10×
Line items
- System — Sub-slab depressurization (most common)$2,087
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Estimates are educational — actual quotes from local pros may differ based on site conditions, permits, and seasonal demand.
Philadelphia local market
Philadelphia and the surrounding PA counties (Bucks, Montgomery, Delaware, Chester) form the largest radon mitigation market in the US — ~50% of homes test above EPA action level. 60+ PA DEP-certified mitigators in the metro. Mandatory disclosure law drives steady real-estate-transaction demand.
Permits, code, and licensing in Philadelphia
PA DEP Radon Mitigation Specialist certification mandatory under 25 Pa. Code Chapter 240. Municipal Mechanical + Electrical permits required ($100-$300). Philadelphia + Montgomery + Bucks county permits all separate.