Mile High Home Group – Welcome to Denver

Are Radon Tests Required in Colorado?

Radon tests aren’t legally required for real estate transactions in Colorado, but they’re strongly recommended and common practice—about 50-60% of homes test elevated, especially in the Front Range, so buyers order them during the 10-day option period to negotiate mitigation before closing.

Why Radon Matters Locally

After 15+ years in Denver real estate and thousands of transactions, I’ve seen radon surface in inspections across the metro. Colorado ranks high nationally for soil gas risks—Douglas and Jefferson Counties near Highlands Ranch show 40-50% action levels over 4 pCi/L, seeping via basements in ranches common to the area. Littleton bungalows and core Denver homes pick it up too from granite countertops or groundwater. Tests cost $150-$250 (short-term canister, 2-7 days), non-invasive—elevated results prompt $800-$1,500 active venting systems.

No mandate, but sellers disclose known issues.

Testing in the Buying Process

During the option period ($100-$500 fee), pair radon with general inspections ($400-$600)—full suite flags foundation cracks aiding entry. Highlands Ranch real estate HOAs ($150-$400) don’t regulate it, but proactive fixes boost appeal near Mountain Vista schools. Littleton Public Schools zones see frequent negotiations for credits. In the Colorado housing market, winter tests lag diffusion; summer peaks accuracy. Compared to radon-low states like Florida, Denver buyers prioritize it alongside sewer scopes amid 4-6% appreciation cycles.

Mitigation warranties transfer easily.

Practical Advice for Buyers and Sellers

Test Type	Cost	When to Order
Radon Canister	$150-$250	Option Day 1-3
Mitigation	$800-$1,500	Post-test negotiate

Buyers, test every basement—insist on pro labs, request $1K credits or repairs; bundle with roof checks.

Sellers, pre-test annually—disclose negatives in listings, offer fixes for quick school-zone closes.

My hands-on, concierge-level service coordinates radon pulls block-by-block, weighs school/HOA fits through market cycles, builds pricing from local sales, and negotiates relentlessly for air-safe homes. Clients are long-term relationships and friends, not transactions—integrity, honesty, transparency, and relentless work ethic breathe easy.

If radon testing fits your Denver real estate questions—Littleton, Highlands Ranch details—reach out anytime. I’m here for a no-pressure conversation and honest guidance tailored to the Colorado housing market.