UK buildings insurance premiums climbed an average of 18% across 2025 and a further 9% in the first quarter of 2026, according to the ABI's most recent quarterly premium tracker. That is materially faster than wage growth and roughly three times the rate of general consumer inflation. The driver, two and a half years after the event, is still substantially Storm Babet — the October 2023 weather system that produced £650 million of household claims and forced the major UK insurers to permanently rebase their flood and storm pricing models for properties across the East Midlands, Yorkshire and the eastern Scottish coast.
For homeowners whose renewals fall between late May and early September — the biggest single chunk of the UK renewal calendar — this summer is the one where shopping the renewal price is no longer optional. The auto-renewal letter that quotes a 14% increase "to reflect changes in your area" is now the rule, not the exception. Two-thirds of UK homeowners take it anyway, and most of them are overpaying by between £80 and £220 a year.
What actually changed in insurer pricing
Babet shifted the industry view of the UK's medium-risk postcodes. Pre-2023, an insurer looking at a property a kilometre from a category-3 flood-risk river treated it as a manageable individual risk. Post-Babet, the modelling treats the same property as part of a correlated-risk cluster — meaning that if it floods, several thousand neighbouring properties probably flooded simultaneously, and the insurer's regional loss is concentrated rather than diversified. That is a fundamentally different commercial calculation, and it is the reason properties that have never flooded are paying 20%-plus more than they were in 2023.
Two insurers — Aviva and Direct Line — have stopped offering buildings cover in around 4,000 specific UK postcodes since late 2024. A third — Admiral — withdrew from another 1,800 in March 2026. The properties affected are not the most-flooded ones, which sit inside the Flood Re scheme; they are the postcodes just outside Flood Re eligibility, in places like Retford, Brechin, Catcliffe and the lower Tweed catchment.
The Flood Re reset that matters in 2026
Flood Re — the industry-backed reinsurance scheme that caps the flood portion of premiums for properties built before 2009 — completed its 2024-2026 price-reset cycle in April. The headline cap for a band-A property fell slightly, from £210 to £196 per year, but the rebated portion that insurers pass back to customers has tightened. The net result is that a Flood Re property in a high-risk postcode typically saw a £40-£70 net annual reduction, while a similar property in a medium-risk postcode just outside the scheme typically saw an £80-£140 increase. The effective gap between qualifying and non-qualifying properties widened.
If your property was built between 2009 and 2025, Flood Re does not apply. The pricing you receive is therefore the raw insurer view of your risk, not the Flood Re-rebated version. That is the case for roughly 4.5 million UK homes, and they are disproportionately the ones receiving the steepest increase letters this summer.
The three renewal tricks that actually work in 2026
Compare on the same rebuild value, not the same sum insured
The single most common reason a quote comparison fails is that the auto-renewal letter has quietly inflated the rebuild cost in line with the BCIS index, while the comparison quote you are running uses the figure you remembered from three years ago. A typical mid-terrace rebuild cost in northern England has risen from about £180,000 to £242,000 between 2022 and mid-2026. Comparing a £180,000 sum insured against a £242,000 one will always show the higher figure as more expensive — even though the cover the lower figure provides is no longer adequate. Use the BCIS rebuild calculator (free, ten minutes) before running any quotes.
Get the renewal quote down before you switch
UK insurers have, under FCA pricing rules since 2022, been forbidden from charging existing customers more than new ones for an equivalent product. The rule is enforced only in aggregate, not on individual quotes. In practice, three of the four largest motor and home insurers will reduce a renewal quote by between 8% and 15% if the policyholder simply phones and says they have a cheaper quote elsewhere. The number is rarely the cheapest market rate — but it is often within £20 of it, and it preserves no-claims continuity, payment timing and pre-existing claim notifications. Phone before you click "switch".
Stack voluntary excess properly
Raising the voluntary excess from £100 to £500 typically reduces a buildings premium by 6%-12%; raising it to £1,000 produces another 4%-8% drop, depending on the property's flood-risk band. The reverse is also true — many people accept a £100 excess they could afford to lift, and pay £30-£60 a year more than they need to. The cap matters: most household budgets can absorb a one-off £500 loss but not £1,000. Setting the excess at the level you could pay out of an instant-access savings account, not the level the slider defaults to, is the right move.
What to do this week if your renewal is between June and August
Pull the renewal letter. Note the rebuild value, the buildings sum insured, the contents sum insured, the policy excess, and the new premium. Run a comparison on Compare the Market, GoCompare and MoneySavingExpert's Cheap Energy Club-equivalent home insurance lookup using the same rebuild figure across all three. If the cheapest quote is more than 12% below your renewal, phone your existing insurer; quote the figure; ask for a match. If they will not match, switch. If they will, take it.
The single thing that loses households the most money on home insurance in 2026 is auto-renewal at the quoted figure. The single thing that gains households the most money on home insurance in 2026 is the twenty minutes of phone calls in the second week of June that everyone else postpones into August.