Yacht valuation methodology for marine surveyors

A practical methodology for arriving at defensible market valuations on small yachts — comparables, condition adjustments, and how to document your reasoning.

Insurance and finance valuations are a steady line of revenue for working surveyors — quicker than full condition surveys, repeatable, and high-margin. The catch is that a valuation is only as defensible as the reasoning behind it. An underwriter who questions a £180,000 figure wants to see the comparables, the condition adjustments, and the market context. Here's the methodology that holds up.

The three-step approach

Every defensible yacht valuation follows the same structure:

1. Establish the comparable base — what similar vessels are selling for, not asking 2. Adjust for condition — what makes this specific vessel different from the comparables 3. Document the reasoning — so anyone reading the report can trace the figure

Skip any step and you have an opinion, not a valuation.

Step 1: Building the comparable set

A "comparable" isn't just any boat of the same make and model. It needs to share:

  • Year of build (±3 years)
  • Engine type and hours (or sail wardrobe condition for sailing yachts)
  • Geographic market (a yacht in Palma sells for different money than one in Hamble)
  • Sale status: closed sales only, not current listings

The mistake most surveyors make is using YachtWorld asking prices as the comparable. Asking prices are aspirational; closed sales are the truth. Use three to five closed sales from the last 12 months in the same market.

Where to find closed sale data:

  • Boat broker contacts — local brokers will share if you ask politely
  • YachtFocus, BoatTrader sold listings where available
  • Auction results for the lower end of the market
  • Insurance industry data if you have access via underwriters

Step 2: Condition adjustments

Once you have a comparable base, adjust for what makes this specific vessel different. Standard adjustments, expressed as % of base value:

| Factor | Typical adjustment | |---|---| | Engine hours significantly above average | −5% to −15% | | Engine recently rebuilt or replaced | +5% to +10% | | New rigging within 5 years | +3% to +5% | | Major osmosis treatment with warranty | +2% to +5% | | Updated electronics package | +3% to +8% | | Recent interior refit | +5% to +15% | | Outstanding deferred maintenance | −10% to −25% | | Damage history without full repair documentation | −15% to −30% |

These are starting points, not a formula. The valuation skill is knowing when an updated electronics package adds 3% or 8%.

Step 3: Documenting the reasoning

The report section that protects you in a dispute looks like this:

> Comparable analysis > Three closed sales of comparable 2014–2017 Beneteau Oceanis 41s in NW European markets within > the last 12 months: > - 2015, Solent, sold March 2026: £145,000 > - 2016, La Rochelle, sold November 2025: €168,000 (£142,400 at sale-date FX) > - 2014, Lymington, sold August 2025: £138,500 > > Mean closed sale value: £141,966. > > Adjustments for subject vessel > +3% for new standing rigging (2024) > +4% for upgraded electronics package (B&G H5000, 2023) > −2% for above-average engine hours (2,840 vs. fleet median ~2,000) > Net adjustment: +5%. > > Market value assessment: £149,000

That paragraph is what an underwriter wants. Numbers, sources, adjustments, conclusion. No underwriter has ever pushed back on a valuation written like that.

Where AI fits

AI valuation tools have got genuinely useful in the last 12 months. They're particularly good at:

  • Aggregating closed-sale data from multiple sources
  • Surfacing comparables a human might miss
  • Producing a first-pass adjusted figure for you to refine

What they're not good at: making the condition adjustments. That's where your judgement on this specific vessel — the things you saw on the boat — has to override the model.

evalo's AI valuation engine generates the comparable base and a suggested adjusted figure with full sourcing, then leaves the condition-call to you. The report exports with all the comparable data documented automatically. It's a 20-minute valuation instead of a 2-hour one — and the documentation trail is stronger than most surveyors produce manually.

The valuation that loses you the client

Vague. Round numbers. No comparables. "In my professional opinion the value is £150,000."

That's not a valuation, it's a guess. Defensible valuations show the working.