5 pre-winter checks your maintenance calendar left out

You cleared the gutters back in October, you've already bled the radiators, and the boiler pressure gauge sits happily between 1 and 1.5 bar. By most of the lists doing the rounds this month, including our own seasonal maintenance calendar, you've done everything asked of you. Then February arrives with a stain spreading across the spare room ceiling, a "your warranty is void" letter from the boiler manufacturer, or an insurance payout that covers two-thirds of what you actually need, and it turns out none of that was ever on the checklist you followed.

Five jobs consistently sit outside the standard autumn checklist, and each one carries a specific cost, deadline or legal quirk that only shows up once something's already gone wrong. Do them between now and the first hard frost and you're covered before winter tests the parts of the house nobody thinks to check.

1. This week: book the service your pressure check doesn't replace

Checking the pressure gauge yourself is free and takes two minutes, but it isn't a service, and manufacturers treat the two very differently. An annual service by a Gas Safe registered engineer costs roughly £70-£95 off-peak or £90-£130 in the depths of winter from an independent engineer, rising to £130-£200 through a national brand such as British Gas (Selectra boiler service cost guide, May 2026). Skip it and you're not just risking a breakdown: Worcester Bosch's 10-year guarantee, Vaillant's 12-year guarantee and Ideal's 10-year warranty each carry the same condition, a missed annual service voids the cover outright (Selectra, May 2026). A boiler that fails outside warranty is a full like-for-like replacement costing roughly £3,000 (HomeOwners Alliance, updated 30 July 2026), not a covered repair. If you're weighing a heat pump instead of a straight gas boiler swap when yours does eventually need replacing, our piece on the £7,500 heat pump grant runs the real net cost.

So if your last service was more than 11 months ago, the £70-£130 it costs to book one this week is cheap insurance against losing thousands of pounds of manufacturer cover you're already paying for through the price of the boiler.

2. Before half-term: get the roof looked at while it's still worth doing

A professional roof inspection costs around £250, and tradespeople recommend one roughly every five years for a newer roof, more often on anything older, ideally before winter weather sets in (Checkatrade roof inspection cost guide, 2026). Skip it and the numbers move against you fast: replacing one to five slipped or broken tiles typically costs £170-£500 depending on access and matching tiles (UK roof repair cost guide, 2026), but a slipped tile left through a wet winter is what turns into the real bill. Once water gets past the underlay, a small ceiling patch runs £150-£200, while more extensive water damage, including replastering and an electrician checking any affected wiring, averages £1,550 and can run to £1,700 (Checkatrade ceiling water damage repair cost guide, 2026).

That makes a £250 check now roughly a sixth of the average bill for the ceiling damage a missed leak can cause, so this is the item on this list that pays for itself fastest if your roof hasn't been looked at in years, not just the one that feels most obviously a job for a professional.

3. Before you light the first fire: the sweep insurers actually ask for

If you have a wood burner, multi-fuel stove or open fire, a chimney sweep typically costs £60-£85, with a UK average of around £72 (HETAS chimney sweep cost guide, 2026), rising for a bird's nest clearance or difficult access. It matters for more than efficiency: insurers can and do ask for proof of regular sweeping before paying out on a chimney-related claim, and a HETAS Chimney Sweeping Certificate is the evidence they recognise (HETAS, 2026). Stove manufacturers often tie their own warranties to the same documented annual sweep.

Light the first fire of the season without a certificate in hand and you're relying on an insurer's goodwill rather than your actual policy if anything goes wrong, so book the sweep before the fire, not after the first cold snap makes you want to use it immediately.

4. Before your renewal lands: check you're not one of the 70%

This is the job with no ladder, no tradesperson, and the biggest number attached to it. An analysis of more than 43,000 UK property assessments found 70% of properties are underinsured, covering on average just 67% of their true rebuild cost, a finding reported independently by the Chartered Insurance Institute (RebuildCostAssessment analysis, via the Chartered Insurance Institute, February 2026). Rebuild cost, what it would actually take to demolish and rebuild your home today, isn't the same figure as your mortgage balance or what you paid for the house. Most buildings insurance policies apply an "average clause": if your sum insured only covers a proportion of the true rebuild cost, your payout is cut by that same proportion, on every claim, not just a total loss. Run the maths on a property with a true rebuild cost of £280,000 but insured at the average underinsured level of 67% (£187,600): a genuine £30,000 fire damage claim pays out £30,000 x 0.67, just £20,100, leaving a £9,900 shortfall on a claim that was fully documented and entirely legitimate. If you're still working through the wider setup checklist, our new homeowner checklist covers where insurance sits alongside everything else in year one.

Check your policy's declared rebuild figure against a free rebuild-cost calculator before your renewal date, because this is the one item on this list where getting it wrong isn't a repair bill, it's a five-figure gap in cover you only discover on the day you need it most.

5. Whenever you're next near a smoke alarm: check which country's rules actually apply to you

England has no blanket legal duty for owner-occupiers to fit smoke or carbon monoxide alarms. The Smoke and Carbon Monoxide Alarm (Amendment) Regulations 2022, in force since 1 October 2022, apply to landlords, not to someone living in their own home. The one trigger that does catch a homeowner is Approved Document J, which requires a carbon monoxide alarm whenever a new or replacement fixed combustion appliance, including a replacement boiler, is installed in an existing home. Cross the border into Scotland and the position flips entirely: since 1 February 2022, every home, owner-occupied included, must have interlinked smoke alarms in the most-used room and every hallway and landing, a heat alarm in the kitchen, and a carbon monoxide alarm wherever there's a carbon-fuelled appliance, enforced by the local authority and declared on the Home Report when you come to sell (Scottish fire and smoke alarm standard, in force since 1 February 2022). Fitting the full Scottish standard in an average three-bedroom home costs around £220.

Whichever side of the border you're on, don't wait for a legal deadline that, in England, won't actually apply to you as an owner-occupier: fit interlinked smoke alarms and a carbon monoxide alarm near any fuel-burning appliance anyway, because the safety case doesn't depend on which regulations happen to bind your particular postcode.

What this means for you

If you only tackle one of these this week, make it the insurance check, not the boiler service. A missed boiler service costs you a service fee and, in the worst case, a warranty. Being underinsured costs you nothing at all until the one day you actually need the cover, and by then it's too late to fix. Pull up your current buildings insurance schedule, find the declared rebuild cost, and run it against a free rebuild-cost calculator before doing anything else on this list. For most people who bought in the last year or two, that figure was set at completion and hasn't been touched since, and rebuild costs move independently of house prices, so a number that was accurate at exchange can already be out of date. If you're weighing a bigger project alongside all this, our improvement guide runs the financing comparison so you're not funding it the expensive way.