Updated October 26, 2026
How surveys describe it
Wording varies by surveyor. Illustrative examples (not quoted from any real survey):
- “Carbon monoxide detector is past its end-of-life date.”
- “No CO detector installed in the accommodations.”
What it is
Boats with enclosed accommodation should have a marine carbon monoxide detector. Detectors have a limited life and show an end-of-life date. Practical Sailor's testing found marine CO detectors priced from about $45 to $190.[1]
How serious it is
Carbon monoxide is a serious hazard on boats with cabins and generators. Replace before anyone sleeps aboard.
In our reports this usually lands under Fix. Your survey's details decide.
What it typically costs
| Scope | Estimated range |
|---|---|
| 1 item | $100–$440 |
| 2 items | $200–$900 |
These ranges combine typical parts costs of $45–$190 per item with our assumption of 0.5–1.5 labor hours, priced at $110–$165 an hour, a typical Florida shop rate.[2][3][1]
- Marine-rated detector
- Hard-wired units take longer to install
Estimates to help you frame a conversation with a yard, not quotes. Real prices depend on the boat, the yard, access and what's found once work starts. Confirm with your surveyor or a qualified yard.
What to ask your surveyor or yard
- How many cabins need detectors?
- Hard-wired or battery?
Have your survey already?
Upload it and get every finding sorted into fix, negotiate, watch or ignore, with the surveyor's page and words beside each one.
Get a free previewSources
- CO Detectors: Fireboy/Xintex Wins; Safe-T-Alert is a Best Buy, Practical Sailor. Boating publication. Accessed 2026-10-26.
- Marine Mechanic Rates: What You'll Pay Locally, Marco Boatworks (Southwest Florida). Repair shop's price guide. Accessed 2026-10-26.
- Mobile Marine Mechanic vs Boat Yard: Real Tradeoffs, Boat Repair Miami FL. Repair shop's price guide. Accessed 2026-10-26.