Contractor Quote Checklist
Bathroom Exhaust Fan Replacement Quote Checklist Before Installation
Short answer: approve a bathroom exhaust fan replacement quote only after it states CFM, sound rating, duct route to the exterior, attic or ceiling access, electrical and switch work, humidity controls, grille or light features, old fan removal, drywall repair, cleanup, and warranty exclusions.
A bathroom fan replacement can be a simple grille-and-motor swap, or it can involve new ducting through the attic, roof, wall, or soffit area. The difference matters because Energy.gov says bathroom exhaust fans should remove moisture and odors and should vent outside the home.
EPA mold guidance also points homeowners toward bathroom fans or open windows while showering. If the quote does not move damp air outdoors, it may not solve the moisture problem.
Start With The Moisture Problem
Ask what the contractor observed: fogged mirrors, peeling paint, mildew odor, window condensation, ceiling stains, mold, fan noise, weak airflow, or a fan that vents into the attic.
The quote should say whether the job is replacing a failed fan, correcting poor ventilation, or adding a new fan where none exists.
Confirm CFM And Sound Rating
Energy.gov gives a practical minimum of at least 50 CFM for bathroom exhaust fans. The quote should state fan airflow, sound rating in sones, and whether the selected fan is appropriate for the room size and duct run.
ENERGY STAR certified ventilation fans also have airflow, efficacy, and sound-level requirements. If the contractor sells an ENERGY STAR model, the exact model or minimum spec should be written.
Require Exterior Ducting Details
The quote should state duct diameter, duct material, route, length, elbows, insulation, damper, and termination point. Venting into an attic, soffit cavity, crawlspace, or wall cavity should not be accepted as a finished scope.
Ask whether the exterior cap is roof, wall, or gable mounted and whether flashing, pest screen, condensation control, and roof penetration repair are included.
Separate Electrical And Control Work
Fans with lights, heaters, humidity sensors, timers, or multiple speeds may need new switches or wiring. The quote should say who handles electrical work and whether permits are required locally.
If the existing switch or wiring is reused, ask whether it supports the new fan features.
Define Access And Finish Repair
Ceiling opening size, attic access, insulation disturbance, drywall patching, paint touch-up, grille fit, and debris cleanup should be written. A fan may be installed correctly while still leaving ceiling repair outside the price.
If old ducting has condensation or mold staining, the quote should say whether removal, cleanup, or remediation is included.
Bathroom Fan Quote Review Table
| Quote area | What to confirm | Why it matters |
|---|---|---|
| Diagnosis | Moisture, noise, weak airflow, attic venting, stains | The quote should solve the actual problem. |
| Fan spec | CFM, sones, ENERGY STAR status, light or sensor features | Airflow and noise affect daily use. |
| Ducting | Exterior route, duct size, cap, damper, insulation | Moist air must leave the house. |
| Electrical | Switches, wiring, permits, sensor controls | New fan features may need more wiring. |
| Finish | Ceiling cut, grille fit, patching, cleanup, old fan disposal | Installation can leave visible repair work. |
Questions To Ask Before Approval
- What CFM and sound rating are included?
- Will the fan vent outdoors, and where exactly will it terminate?
- What duct size, material, route, elbows, damper, and exterior cap are included?
- Are attic access, insulation disturbance, drywall patching, and cleanup included?
- Who handles switch, timer, sensor, light, or heater wiring?
- What mold, condensation, or old duct contamination is excluded?
- What labor and manufacturer warranty applies?
Red Flags In This Quote
The quote says “replace fan” but does not mention ducting or exterior termination.
The fan includes humidity sensing, light, or heater features but the electrical scope is missing.
The contractor excludes ceiling repair, old duct removal, or attic cleanup without giving a separate price.
Source Links
- Energy.gov: Ventilation
- ENERGY STAR: Ventilation Fans
- DOE/PNNL Building America: Bathroom Fan Ratings
- EPA: Mold, Moisture, And Your Home
- FTC: How To Avoid A Home Improvement Scam
FAQ
Should a bathroom fan vent outdoors?
Yes. The quote should describe the route and exterior termination so moisture is not dumped into the attic or another hidden space.
Is 50 CFM enough for every bathroom?
No. Energy.gov lists at least 50 CFM as a practical minimum, but room size, duct length, and fixture layout can require more.
Should drywall repair be included?
Only if written. Fan replacement can require a ceiling cutout or patch, especially when the new housing is a different size.
Who handles new switches or timers?
The quote should state whether electrical controls are included and who performs the work.
What is the biggest quote risk?
The biggest risk is paying for a new fan that still vents poorly, dumps moisture into the attic, or leaves ceiling and electrical work outside the price.
Internal Link Candidates
- Attic Air Sealing And Insulation Quote Checklist
- Bathroom Remodel Quote Checklist
- Mold Remediation Quote Checklist
A bathroom fan quote is ready only when airflow, outdoor ducting, electrical controls, finish repair, cleanup, and moisture exclusions are written down.