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    Marine surveyors

    Marine surveys for narrowboats & canal boats

    A survey checks a boat's condition, hull thickness and systems — what you'll want before buying a boat, or to insure or renew cover on an older one. Here's what a survey involves, what it costs and how to choose a surveyor.

    A survey is not the same as a BSS examination. A Boat Safety Scheme certificate confirms your boat meets essential safety requirements; a survey assesses its overall condition and value. Many boats need both — and many surveyors carry out BSS examinations too. More on the BSS.

    Types of survey

    Which one you need depends on whether you're buying, insuring or valuing.

    Pre-purchase survey

    The full check before you buy

    Hull-thickness readings, structure, systems, engine and often oil/fuel sampling. The report most buyers and lenders rely on. Usually done out of the water.

    Insurance / condition survey

    For cover on an older boat

    A condition-and-valuation report accepted by insurers. Many insurers require one every few years once a boat passes ~15–25 years old.

    Valuation report

    An independent market value

    A market-value assessment for finance, sale, insurance or probate — lighter than a full structural survey.

    Hull / out-of-water survey

    Steel thickness & baseplate

    The boat is lifted so the surveyor can take ultrasonic thickness readings and inspect the baseplate and below-waterline hull for pitting and wastage.

    What a surveyor checks

    Hull & structure

    Ultrasonic steel-thickness readings, pitting/corrosion, baseplate, welds and overplating.

    Engine & drivetrain

    General condition, mountings, cooling, exhaust, stern gland and signs of overheating or leaks.

    Gas system (LPG)

    Pipework, appliances, ventilation and bubble-tester — overlaps with the BSS.

    Electrics

    Batteries, wiring, isolation, galvanic protection and shore-power safety.

    Fit-out & damp

    Ballast, cabin sides, windows, roof, and moisture in the cabin and bilges.

    Safety equipment

    Fire extinguishers, CO alarms and general compliance with the Boat Safety Scheme.

    What a survey costs

    Fees vary by boat length, survey type and region, but as a rough guide for a narrowboat:

    • Full pre-purchase / out-of-water hull survey — commonly around £15–£20 per foot, so roughly £400–£800+ for a typical 40–60ft boat.
    • Insurance / condition survey — often a little less than a full pre-purchase survey.
    • Valuation only — the lightest and cheapest option.

    On top of the surveyor's fee you'll usually pay the marina or boatyard separately for the crane-out / dry-dock to lift the boat. Always get a written quote that spells out what's included.

    Figures are indicative ranges to help you budget — always confirm the fee directly with the surveyor.

    How to choose a surveyor

    Look for someone accredited, insured, and experienced with the kind of boat you're buying. Check they:

    • Are a member of a recognised body (IIMS or YDSA/YBDSA).
    • Carry professional indemnity insurance.
    • Regularly survey inland-waterways craft (a sea-yacht surveyor isn't always the right fit for a steel narrowboat).
    • Are independent of the seller or broker.

    Questions worth asking

    • Are you accredited (IIMS, YDSA/YBDSA) and do you carry professional indemnity insurance?
    • How much experience do you have with inland-waterways craft — narrowboats and widebeams specifically?
    • What does the fee include — out-of-water lift, thickness readings, a written report, and how soon?
    • Can I see a sample report, and will you talk me through the findings afterwards?
    • Do you also carry out Boat Safety Scheme examinations?

    Find a qualified surveyor

    These two professional bodies let you search for accredited marine surveyors by area and survey type. Always check the surveyor covers inland-waterways craft and carries professional indemnity insurance.

    IIMS — International Institute of Marine Surveying

    Find a qualified marine surveyor by region and survey type

    Visit website →

    YBDSA — Yacht Brokers, Designers & Surveyors Association

    Find-a-surveyor directory of accredited members

    Visit website →

    Boat Safety Hub lists these resources to help you find a qualified surveyor. We are not a surveyor and do not carry out surveys. A verified surveyor directory is coming soon.

    Buying a boat?

    A survey is the buyer's best friend. Browse boats for sale on The Boat Market, and check a boat's history or register your own on The Boat Registry.

    Many BSS examiners also carry out surveys

    If you need both a survey and a Boat Safety Scheme certificate, a single examiner-surveyor can often do both. Browse verified BSS examiners near you.

    Find a BSS examiner