The window between the last warm week of autumn and the first proper cold snap is a short one, and it closes without warning. Nearly every expensive winter problem we get called out to — burst pipes, boilers that won't fire, damp patches spreading across ceilings — starts quietly weeks before it turns loud. The £40 job in October becomes the £600 emergency call-out in January.
Whether you own the house you live in or you're a landlord looking after a portfolio, this is the pre-winter checklist worth working through now. None of it is complicated. Some of it you can do yourself with a ladder and half a Saturday. The rest is what to book in with a handyman before the diary fills up.
Bleed the radiators and get the boiler serviced
If the tops of your radiators are cold while the bottoms are hot, there's trapped air in the system and it's costing you money every day the heating is on. Bleeding radiators is a five-minute job with a small key you can buy for a couple of pounds, and it makes an immediate difference.
The boiler is the bigger conversation. An annual service isn't just about efficiency — it catches the small faults that turn into breakdowns at 7am on a Tuesday in December, and it keeps your warranty valid. Every heating engineer in the country is fully booked from mid-November onwards, so book it now, not then. Landlords have a legal duty to arrange an annual gas safety inspection anyway; combining it with a full service is common sense.
While you're at it, check the pressure gauge. Most combi boilers want to sit between 1 and 1.5 bar cold. If it's dropping steadily week on week, there's a slow leak somewhere and it needs looking at.
Clear the gutters and downpipes
This is the single most under-rated maintenance job in British housing, and it's responsible for more damp problems than almost anything else. When gutters block with leaves and moss, water pours down the outside wall instead of running away. Over a wet winter, that wall gets soaked, the brick or render stays saturated, and by February you've got a damp patch appearing inside on the same wall.
Freeze-thaw makes it worse. Water sits in blocked gutters, freezes, expands, cracks the seams and joints, and by spring you need new sections. Clearing them takes an hour with a ladder and a trowel; replacing them costs hundreds.
If your gutters have been left for a season or two, or if you can't safely get up to check them, it's a job worth booking in. We'd rather clear a gutter for you now than come back in March to trace a damp patch back to the same neglected downpipe.
Reseal around windows and external doors
Silicone shrinks and cracks over time, especially where it's exposed to summer sun and winter frost year after year. Once it splits, wind-driven rain finds a way behind it, and the timber or plaster on the inside starts to suffer.
Walk around the outside of the house and look at every window frame and door frame where sealant meets wall. If you can see gaps, discolouration, or sealant lifting away from the surface, it needs redoing. This is a straightforward job — scrape the old sealant out, clean the surface, apply new — but the difference in draughts and damp risk is significant.
Weatherstripping around door frames does the same job for warm air escaping. If you can feel a draught at the edge of an external door with the back of your hand, the strip needs replacing.
Lag any exposed pipework
Burst pipes are consistently the number one winter insurance claim in the UK, and almost all of them happen in the same places: lofts, garages, outbuildings, external walls, and the pipe run to an outside tap. Any pipe carrying water through an unheated space is a candidate for freezing.
Foam pipe lagging costs a few pounds a metre from any DIY shop and clips on in minutes. It doesn't stop a freeze forever in extreme cold, but it buys you enough time and enough thermal margin that most winters go by without incident. If you have an outside tap, either fit an insulated cover or shut off and drain it from the internal isolator valve before the first hard frost.
The pipes you can't see are the awkward ones. If your loft insulation has been walked on and pushed to the sides, the pipe runs across the joists may now be exposed. Worth a torch and ten minutes up there before the weather turns.
Check the roof, chimney flashing and loft insulation
You don't need to climb up on the roof yourself. Stand across the road with a pair of binoculars, or better, from an upstairs window opposite. You're looking for slipped or missing slates and tiles, cracked or lifting flashing around the chimney and any roof penetrations, and moss build-up in the valleys. Anything that looks off is worth getting a proper eye on before storm season.
In the loft, current guidance is 270mm of insulation between and over the joists. Most houses built more than fifteen years ago fall short, and topping up is one of the highest-return improvements you can make to a house's running costs. It also protects the pipework and stops warm moist air from the house condensing on cold surfaces above.
If you have a chimney that isn't used, make sure it's capped properly. Uncapped disused chimneys are a common route for rain to get into a house, and the damage builds up out of sight until you notice a stain on a bedroom ceiling.
The point of the exercise
None of these jobs is glamorous. None of them add to the value of the property. What they do is stop the boring, expensive, disruptive failures that turn a British winter from an inconvenience into a claim on your insurance.
If you'd rather have someone work through the list for you, we'll come out and do the lot in a morning. It's the kind of thing that pays for itself the first time a hard frost rolls in and your pipes hold.
The £40 job in October becomes the £600 emergency call-out in January. Do the small things while the weather still lets you.
Frequently asked
When should I start winter-proofing my home?
Ideally September to early November. Boiler engineers get booked up from mid-November, and any external work like gutters or resealing needs to happen while the weather is still dry enough to work in.
Do I really need my boiler serviced every year?
For gas boilers, yes — it keeps your warranty valid, catches faults early, and for landlords it's a legal requirement under the Gas Safety (Installation and Use) Regulations.
What's the cheapest job that saves the most money?
Bleeding radiators and lagging exposed pipes. Both cost almost nothing in parts and each prevents a much larger bill.
I'm a landlord — whose responsibility is winter maintenance?
The structural fabric of the property and the heating system are the landlord's responsibility. Tenants are usually responsible for day-to-day care, including keeping the heating on low during cold snaps to prevent freezes. It's worth setting expectations in writing before winter starts.