Closing in 8 days with a failed radon test: a real-estate timeline

The setup

A 1932 Tudor in Mariemont. Buyer's home inspection included a 48-hour radon test (placed in the basement family room). Reading came back at 8.7 pCi/L. EPA action level: 4.0. The buyer's agent flagged it under the radon contingency clause in the purchase contract. Closing was scheduled in 14 days.

The seller's agent called the LeadTimber dispatcher at 4:30 PM on day 6 of the 14-day clock. Counter-offer from the buyer was on the table: either a $4,500 closing credit "for radon mitigation" (high) or seller installs and warrants a system before closing (preferred by seller). Seller chose option two. From that phone call, the partner-network team had 8 calendar days to scope the job, run the install, retest, deliver lender-ready documentation, and not blow up the closing.

Day by day

Day 6 (4:30 PM call). Phone consultation with the seller's agent and seller. Confirmed test methodology, pulled the buyer's inspector's PDF report, talked through Mariemont-typical mitigation approach (Tudor-era stone basements often need extra crack sealing). Booked a same-week on-site visit for day 8.

Day 7. Internal: ordered fan stock, confirmed crew availability for day 9. Sent seller a written estimate range: $1,800-$2,400 fixed once on-site assessment confirms scope.

Day 8 (on-site assessment, 9:00 AM). Partner-network mitigator measured the basement footprint, identified two slab cracks needing sealing, located the cleanest exterior routing along the north wall (mature shrubs were a problem on the south side), and wrote the fixed quote: $2,180. Seller signed by noon. Install scheduled for day 9, 7:30 AM.

Day 9 (install day). Crew on site 7:30 AM. Core drill, suction pit excavated by 9:30 AM. Stack routed up through a basement utility room, out the wall above the rim joist, up the exterior to roofline. Fan mounted in an outdoor enclosure (Radonaway RP145, sealed for weather). Polyurethane on both slab cracks, foam-and-caulk seal at the rim joist penetration. Manometer reading at 5 PM: 1.1" water column. Crew gone by 5:30.

Day 10 (CRM placed). Partner contractor returned at 7:00 AM, placed a continuous radon monitor in the same spot the buyer's inspector originally tested. Closed-house conditions documented and signed by seller. 48-hour clock started.

Day 12 (CRM retrieved, report generated). Monitor pulled at 7:00 AM. 48-hour average: 1.4 pCi/L. Down 84% from pre-mitigation. PDF report generated same day, formatted to ANSI/AARST MAH-2019, including hourly radon readings, temperature/humidity/pressure log, chain of custody, technician credentials. Sent to seller's agent, buyer's agent, and the lender by 11:00 AM.

Day 13. Buyer's agent confirmed receipt and acceptance. Buyer's lender added the report to the closing package. No re-inspection requested (the chain-of-custody log and credential page were enough; this is normal when the testing professional is NRPP- or NRSB-credentialed).

Day 14. Closing went through on schedule.

What made this work

Three things, in order of importance.

The fixed quote, signed by the seller before any work started. Real-estate windows blow up when the install bill drifts. A written quote with line-item scope removes that risk. If the partner contractor finds something that genuinely changes scope mid-install (rare, but happens), they pause and get a written change order.

Closed-house conditions documentation. The 48-hour retest is only useful if the buyer's lender accepts it. ANSI/AARST MAH-2019 conforming reports go through underwriting without question. Casual screening reports do not.

Clear day-by-day calendar before sign-off. Sellers panic about radon timelines. Walking through "day 8 measure, day 9 install, day 10-12 retest, day 12 report delivered" in writing on day 6 cuts the cortisol and lets the deal move.

What homeowners (and sellers) should know

• Radon mitigation almost always fits inside a standard 14-day inspection window if you start within 2-3 days of the test result.
• The fixed-price model is the right model. Avoid contractors who quote a "starting at" range without on-site assessment.
• The post-mitigation report is what the lender wants. The install certificate alone is not enough.
• A documented post-mitigation reading below 2.0 pCi/L typically improves the resale value of Cincinnati homes by $5,000-$10,000 versus an unmitigated comparable, per local MLS analysis.

When this does not work

If the install day falls on a stretch of below-40°F outdoor temperatures, the polyurethane caulk used on slab sealing can fail to cure properly. Most Cincinnati partner-network teams will switch products or add a portable heater for the basement. If neither works, the timeline slips by a day. Plan for it.

If the home has an unusual foundation (bell-cellar, multi-level partial basement, or a converted coal cellar with stone walls), the on-site assessment can flag a multi-zone install requiring two separate stacks. That bumps the price and adds half a day. Rare in Mariemont; more common in Indian Hill custom builds.