The deductible you choose is mostly a water decision

Raising the deductible is the one lever every homeowner is offered at renewal: take a bigger share of each claim, pay less premium. The lever looks like one number. In the terms it is several, because deductibles attach per peril, and the water perils treat your choice differently from every other row: some multiply it, some cap it, some let a tier refund it. The insurers’ own current documents show all three mechanisms, which means the deductible decision is best made the way an adjuster will read it: against the water rows of your specific policy, not against the premium quote.

Your number is applied per peril, and water compounds it

The multiplication is not a metaphor. If’s Finnish home terms state that a flood claim on the building deducts the chosen deductible twice over, capped at 1,700 euros (Kodin omaisuusvakuutusehdot OMA 200.27, in force 1.1.2026). A deductible raised from 200 to 850 euros to soften the premium is a quiet 1,700-euro first bite out of exactly the claim that made you want insurance. Sweden runs the same interaction in a different direction: on Länsförsäkringar Göteborg och Bohuslän’s villa terms, an agreed higher deductible replaces the special flood deductible whenever it is the larger number (Villahemförsäkring VH25), so a homeowner who negotiated a high base deductible has silently traded away the 10,000-kronor cap that clause carried. Neither insurer hides this; both state it in the deductible clauses that renewal letters never quote.

The pattern to take from the two cases is general. The premium question (“how much do I save per year”) has one answer; the claim question (“what is my share when the water comes”) has one answer per peril, and the storm and flood guide shows how far those perils’ terms already vary between insurers before your choice multiplies them.

Tiers often sell a smaller share, not more perils

The tier ladder reads like an expansion of coverage. Sometimes it is. Just as often the expensive tier covers the same events and changes only whose money pays first. Folksam is the clean example: the flood peril in Villaförsäkring Stor is the same clause as in Bas, 10% of the damage with a 10,000-kronor floor, but Stor refunds that special deductible down to the 1,800-kronor base (Hem och villa villkor S2940 26-01). For a house near water, the honest name for that tier upgrade is flood-deductible insurance. Whether it is worth buying is then a real calculation instead of a feeling: the tier’s extra premium against 8,200 kronor of deductible relief, times how often you believe the water comes.

The same reading applies in the other direction at the bottom of the ladder. A cheaper tier that quietly moves the natural-phenomenon cover out of the package, the structure LähiTapiola’s terms use by listing exceptional flood as its own elected cover on the policy schedule (kotivakuutusehdot, in force 1.1.2026), saves premium by removing the peril, not by resizing your share of it. Both moves live in the same two pages of the terms, which is why the tier decision and the deductible decision are the same read.

The Dutch version: the deductible is the product option

Dutch building policies make the per-peril logic visible at purchase. The storm threshold is the same windforce 7 in all three of the big policy sets, but what a storm costs you is a product choice: Interpolis charges a fixed 250 euros per storm event, a.s.r. charges 375 unless your policy schedule says you chose zero, and Nationale-Nederlanden applies whatever base deductible you picked when you bought the policy (Interpolis WOO-RV-50-251, a.s.r. D WH 2020-01, NN Basis PP 2100-10; all checked July 2026). None of the three attaches a special deductible to the flood peril itself. A Dutch reader choosing between insurers is therefore partly choosing a storm deductible, and the a.s.r. buy-out is worth pricing: in a coastal wind climate, 375 euros per storm event is not a hypothetical.

Worked example: Oskar prices a tier against a cloudburst

Oskar’s villa in Uppsala backs onto a stream. His Folksam renewal offers Bas and Stor, and the flood clause is identical in both, so he prices one plausible claim instead of comparing feature lists: a cloudburst that puts 60,000 kronor of damage in his ground floor. On Bas his share is the special deductible, 10% with the 10,000 floor, so 10,000 kronor. On Stor the refund clause cuts it to the 1,800 base. The tier is therefore worth exactly 8,200 kronor to him per flood claim, and the decision becomes arithmetic he can do on the renewal letter: the yearly price difference between the tiers, against 8,200 kronor, times how often he believes the stream rises. If that is oftener than the ratio of the two numbers, Stor pays for itself on the flood clause alone; if the stream has never risen in thirty years, he is buying calm, and can price that honestly too.

Then he checks the other direction before signing: has he agreed to any raised base deductible that would override the caps, and does every named water cover sit on his policy schedule? Fifteen minutes, two clauses, and the renewal letter’s one number has become the three numbers it always was.

The read that replaces the rule of thumb

The usual advice, take the highest deductible you can afford, assumes the deductible is applied once and evenly. Your terms apply it per peril, multiplied at some insurers, capped at others, refundable at a third. So run your candidate number through the three water rows of your own policy: the flood row, the leak row, the storm row. Write down your share of a realistic claim under each. That table, four numbers on the back of the renewal letter, is the entire decision, and it is also a record worth keeping: the deductible you chose and why belongs next to the policy in your house’s file, the way it sits against the policy in appkeep, so the next renewal starts from your reasoning instead of from the insurer’s default.

Whether to claim at all once damage comes is a separate arithmetic, covered in is it worth claiming on home insurance. What the perils themselves cover, and where their definitions vary, is the storm and flood guide’s ground. And when the water arrives below every threshold, who pays then has its own answer.

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Related guides

• What home insurance covers in a storm or flood: the peril definitions your deductible choice multiplies against.
• Water in the cellar but no flood: who pays when the claim falls below the flood gates entirely.
• Is it worth claiming on home insurance for small damage: the claim-or-absorb arithmetic your deductible sets the terms for.

Glossary terms used in this guide

• Glossary: Component: the house’s units of risk; the water rows price the wettest ones.
• Glossary: Consequential damage: the part of a water claim no deductible clause touches, and the reason speed still matters more than paperwork.