Radon Mitigation Cost: A Sub-Slab System, Itemized (2026 Baseline)
An active sub-slab radon system for a 1,100 sq ft finished basement: suction point, exterior pipe to the roof, fan, sealing and the follow-up test, itemized with crew hours.
Describe it
Every line, by trade
The job in the Clamp app: described in plain words, then the draft at $2,232 job cost, every line grouped by trade. Sample data.
The job at a glance
One build, fully itemized, with crew hours.
| Build | Job cost | Labor | Crew hours | Materials | Illustrative selling price |
|---|---|---|---|---|---|
| A. One suction point, exterior route | $2,232 | $715 | 6 to 10 h | $667 | $2,901 to $4,464 |
Dump fees and other costs ($850) are the same in every build and included in the job cost. Materials include allowances. Illustrative selling price is the job cost at a 30% to 100% markup; your price depends on your own overhead and profit. Labor hours are a planning range and include setup, daily cleanup and material runs; they are never a charge to the customer. Permit and inspection fees are not included; requirements vary by jurisdiction.
The build in detail
A. One suction point, exterior route: $2,232
A suction point is cored in the utility room; 30 feet of PVC runs up the outside to above the roof with the fan outside the living space; slab cracks and the sump lid are sealed; a manometer, labels and a follow-up test finish it. Labor is $715 of the $2,232 job cost, or 32.0%. It is about 6 to 10 hours of work, including setup, daily cleanup and material runs.
Labor cost by trade
Labor only. Materials, allowances and dump fees are in the line items below. Hours are person-hours at typical production from Clamp’s labor hours catalog, as a range: a planning figure, not a schedule and not a charge to the customer.
| Trade | Hours | Labor cost | Low-Overhead×1.30 | Established×1.50 | Full-Service×2.00 |
|---|---|---|---|---|---|
| Plumbing | 2 to 7 h | $480 | $624 | $720 | $960 |
| Electrical | 1 to 2 h | $120 | $156 | $180 | $240 |
| Specialty | 1 to 3 h | $115 | $150 | $173 | $230 |
| Setup, cleanup and material runs | 1 to 2 h | in the prices | |||
| All labor | 6 to 10 h | $715 | $930 | $1,073 | $1,430 |
Every line item
Labor $715 + materials and allowances $667 + dump fees and other $850 = $2,232 direct job cost. Hours are person-hours at typical production, on labor rows only, and the direct-cost row adds about 15% for setup, daily cleanup and material runs; an allowance or material row names the labor line that installs it, and a subcontract row has none, because the sub’s price includes their own time. Some labor quantities include a difficulty factor, so they can exceed the measured area; each row’s derivation is in the downloadable data.
| Item | Qty | Unit | Hours | Labor | Material | Line cost |
|---|---|---|---|---|---|---|
| Plumbing | ||||||
| DWV Materials | 33 | lf | $0 | $206 | $206 | |
| Radon Vent Pipe Install Labor (per lf) | 30 | lf | 2 to 7 h | $480 | $0 | $480 |
| Plumbing subtotal | 2 to 7 h | $686 | ||||
| Plumbing subtotal | 2 to 7 h | $686 | ||||
| Electrical | ||||||
| Electrical Box and Device MaterialsLabor on: Electrical Rough-In Per Device | 1 | ea | $0 | $9 | $9 | |
| Electrical Rough-In Per Device | 1 | ea | under 1 h | $55 | $0 | $55 |
| Outlet/Switch Install | 1 | ea | under 1 h | $65 | $0 | $65 |
| Switch Unit AllowanceLabor on: Outlet/Switch Install | 1 | ea | $0 | $7 | $7 | |
| Electrical subtotal | 1 to 2 h | $136 | ||||
| Electrical subtotal | 1 to 2 h | $136 | ||||
| Specialty | ||||||
| Radon Fan Allowance (per fan)Labor on: Radon Vent Pipe Install Labor (per lf) | 1 | ea | $0 | $300 | $300 | |
| Radon U-Tube Manometer and System Labels (per point)Labor on: Radon Vent Pipe Install Labor (per lf) | 1 | ea | $0 | $35 | $35 | |
| Radon Post-Mitigation Test Allowance (per test) | 1 | ea | $0 | $110 | $110 | |
| Radon Slab Crack and Sump Lid Sealing (per lf) | 20 | lf | 1 to 3 h | $115 | $0 | $115 |
| Radon Suction Point Core and Pit (per point) | 1 | ea | $0 | $0 | $375 | |
| Specialty subtotal | 1 to 3 h | $935 | ||||
| Specialty subtotal | 1 to 3 h | $935 | ||||
| Roofing | ||||||
| Radon Exhaust Penetration and Flashing (per system) | 1 | ea | $0 | $0 | $475 | |
| Roofing subtotal | $475 | |||||
| Roofing subtotal | $475 | |||||
| DIRECT JOB COST | 6 to 10 h | $2,232 | ||||
| DIRECT JOB COST | 6 to 10 h | $2,232 | ||||
Methodology & reproducibility
One reviewed snapshot for this build. The build is frozen from its own estimate run and priced by the published pricer.
Direct cost equals the sum of each row’s rounded quantity × (labor + material + other). Amounts are shown in whole dollars; every column adds to its total.
Scope selection, prose accuracy, arithmetic and provenance mapping reviewed; not independent market-rate verification.
- radon-mitigation-sub-slab/v1: JSON, CSV, field dictionary
Questions
Why route the pipe outside?
The basement is finished, and the customer did not want it torn up. An exterior route keeps the pipe and fan out of the living space; the trade-off is the roof penetration and flashing, which is its own line.
What can push this job higher?
A second suction point if one does not draw down the whole slab, an interior route through finished space, a sump that needs a sealed lid and pit work, or electrical that is not near the fan. Each is its own line.
Is the markup on top of this?
Yes. Direct job cost is what the system costs a contractor to perform. The markup table shows what it sells for at illustrative markups of 30% to 100%.
Sources & provenance
- One suction point, exterior route reviewed snapshot Clamp Research