Start With the Hull, Not the Kitchen

It is entirely natural to walk onto a narrowboat and fall in love with the oak worktops and the little stove in the corner. But the interior is the cheapest part of a boat to change, and the hull is the most expensive part to put right. On a first viewing, resist the pull of the soft furnishings and head straight for the waterline.

Most narrowboats are built from mild steel, commonly with a 10mm baseplate and hull sides of 6mm, though older boats may be 5mm or even 4mm from new. What matters is not the original specification but what is left now. A hull surveyor will use an ultrasonic thickness gauge to take readings along both sides, the baseplate and the swims, and will note the deepest pits as well as the average. As a rough guide, 4mm of sound steel is generally workable, 3mm to 4mm needs watching and regular re-inspection, and anything under 3mm will need plating before long.

Ask when the boat was last out of the water and blacked. Most owners aim for every two to four years, and sacrificial anodes should be checked and replaced at the same time. A boat that has been regularly docked and looked after is usually a far better prospect than one with a glossy interior and no hull history.

Budget for a Proper Survey

A full out-of-water survey with ultrasound readings is not a box-ticking exercise, and it is the single best money you will spend. Expect to pay a few hundred pounds for a short boat and closer to a thousand for a longer one, depending on whether you want hull only or hull and systems. Insist on the boat being lifted or docked rather than relying on a quick look while afloat.

Alongside the survey, check the Boat Safety Scheme certificate. It is required to hold a Canal & River Trust licence and is renewed every four years. A current certificate is reassuring, but it is not a substitute for a hull survey — it covers gas, electrical and fuel systems rather than steel thickness.

Engine Hours and Mechanical Realities

Engine hours can mislead. A twenty-year-old leisure engine with 1,500 hours on the clock has done very little work, while a former hire boat may have run several thousand hours in a fraction of that time. Diesel engines generally prefer regular use to long spells of idling and neglect, so look for evidence of servicing rather than a low number on the gauge. Hour meters do fail and get replaced, so cross-check the figure against the general condition of the engine bay.

• Service records, oil and filter changes, coolant condition and any recent injector work.
• Cleanliness of the engine bay, and signs of leaks around the gearbox and stern gland.
• The shaft, propeller and rudder, including play in the stern tube and condition of the anodes.
• Battery bank age and capacity, charging setup, inverter and any solar installation.
• Heating and hot water: solid fuel stove, diesel heater, calorifier and their service history.

Commonly marinised units such as the BMC 1.5, Beta, Yanmar and Lister are well understood by engineers and parts are generally available. Ask who has maintained the boat, and whether they kept receipts.

Layout: Liveaboard, Leisure, or Something In Between

The stern type shapes how you will live with the boat. A traditional stern gives more internal space but leaves the steerer isolated; a semi-trad offers a small rear deck and a bit of company; a cruiser stern has the most outdoor seating and the least cabin. For a couple cruising weekends, a cruiser stern is often the friendliest. For year-round living, the extra cabin space of a trad or semi-trad usually wins.

Think carefully about the sleeping arrangement. A fixed double or cross bed is comfortable but eats space; a make-up bed keeps the cabin flexible but becomes tedious night after night. Consider the galley position, whether you want a reverse layout with the saloon at the stern, and how much storage you genuinely need for clothes, tools and spare parts. Pump-out toilets are convenient but rely on regular emptying points, while cassettes are simple and portable. Headroom, water tank size and heating output all matter more in February than they do on a sunny test run.

Paperwork, Licensing and Ongoing Costs

Before committing, confirm the boat's provenance. Ask for a bill of sale, previous receipts and any build or conformity documentation. Boats built or imported since the late 1990s should meet the relevant recreational craft requirements, and VAT status matters if you ever plan to take the boat abroad. There is no central register of ownership in the UK, so a clear paper trail is your protection.

Budget beyond the purchase price: the annual CRT licence, mooring fees whether online or in a marina, insurance, and a sinking fund for blacking, anodes and the unexpected. Many first-time buyers underestimate the running costs by a comfortable margin.

A Practical Viewing Checklist

• Take a torch, a damp meter and a notebook, and view in daylight if you can.
• Look for rust staining, damp patches and soft flooring around windows, hatches and the stern.
• Check every tap, light, pump and appliance, and run the engine from cold.
• Ask directly why the owner is selling and how long the boat has been on the market.
• Never make an offer subject to survey without agreeing a deposit and a clear refund position.

Buy the best hull you can afford, then make the interior your own. A sound, well-documented boat with tired cushions is a far better start than a beautiful cabin sitting on steel that needs plating. Take your time, ask awkward questions and let the survey do the worrying for you.