Boat Winterisation Checklist for UK Owners
Winterisation protects boats during periods of inactivity and cold weather. A structured checklist reduces the risk of damage, corrosion and costly repairs before the next season.
Why winterisation is important
UK winter conditions can cause freezing damage, moisture ingress and deterioration if systems are left unprotected. Winterisation helps preserve engines, plumbing and onboard systems during extended lay-up.
Requirements vary depending on storage method, vessel type and location.
Core winterisation tasks
Engine and cooling system protection
Protecting the engine involves draining raw water systems, flushing with antifreeze where appropriate, and checking belts, hoses and corrosion points.
Fuel system treatment
Fuel treatment helps prevent condensation, microbial growth and injector issues during periods of inactivity. Tank levels and additives are commonly addressed.
Electrical system care
Batteries should be isolated, removed or maintained on suitable chargers. Connections are inspected for corrosion or wear.
Freshwater and sanitation preparation
Water systems are drained or protected with antifreeze to prevent freezing damage to tanks, pumps and pipework.
How storage type affects winterisation
Winterisation requirements differ depending on whether a boat is stored indoors, outdoors or afloat in a marina. Exposure level and access influence the scope of preparation needed.
See our guide to boat storage and winterisation options for broader context.
Planning and cost considerations
Winterisation may be included within storage packages or offered as a separate service. Costs depend on vessel size, system complexity and service scope.
Indicative pricing is covered in boat storage costs in the UK .
Next steps
Confirm winterisation requirements early, document completed tasks and clarify responsibility between owner and storage provider before lay-up.
Further guidance is available via the contact page.