Start with three price sources, not one
Pull the same boat from three places: NADA/J.D. Power boat values, recent sold listings on brokerage sites, and current asking prices within 300 miles. Asking prices run high. Sold prices are the truth. The gap between the two is your negotiating room, and on used boats it is usually 8 to 15 percent.
Depreciation by age
Typical retained value for a mainstream fiberglass powerboat, well maintained:
| Age | Share of original price | What drives it |
|---|---|---|
| 1 year | 75 to 85% | Drive-off drop, still under warranty |
| 3 years | 65 to 72% | Warranty ending, first big service due |
| 5 years | 55 to 62% | Electronics dated, upholstery wear |
| 10 years | 35 to 45% | Engine hours and repower risk |
| 15+ years | 20 to 30% | Value tracks engine and trailer condition |
Engine hours move the price more than the year
Gas outboards are commonly considered mid-life around 750 to 1,000 hours; gas inboards sooner; diesels far later. A repower on a mid-size outboard boat runs $15,000 to $40,000, so a high-hour engine should take a large, specific bite out of the price - not a vague "it needs some work" discount.
Costs to subtract before you call a price fair
- Marine survey: $20 to $25 per foot, plus a haul-out of $200 to $600.
- Sea trial fuel and captain time.
- Bottom paint: $1,500 to $4,000 if it is due.
- Trailer condition: bearings, brakes, and tires are $500 to $2,500.
- Annual ownership: budget 8 to 10 percent of the boat's value per year.
A quick fair value formula
Median sold price for the same year, make, and length, minus documented deferred maintenance, minus 10 percent if the engine is past mid-life, minus survey and haul-out. If the asking price is more than 10 percent above that number, you are being asked to pay for the seller's optimism.