Free Property Under-Insurance Check

Underinsurance happens when a property's insured sum is lower than its actual insurable value (typically the cost to rebuild it). Under Section 2854 of the Civil Code, the insurer then doesn't pay out the full loss when damage occurs — only the share matching the ratio of insured sum to insurable value, unless the parties agreed otherwise. According to the Czech Insurance Association (ČAP), up to 70% of Czech family houses are underinsured this way, on average covering only 60% of their real value — costing households up to CZK 700 million a year in unpaid claims.

No law sets a specific interval — this is a recommendation, not a legal duty. The Czech Insurance Association (ČAP) recommends reviewing and updating your policy and insured sum every 2–3 years, because construction costs and property values shift over time and an old insured sum stops matching the property's real value.

Built-up volume (obestavěný prostor) is the building's volume in m³ that the valuation decree uses as the basis for pricing. Under Decree No. 441/2013 Coll., it's calculated as the sum of the volume of the substructure, superstructure and roofing — foundations are not counted. If you don't know the exact built-up volume from your building documentation, the calculator offers a simplified estimate (built-up area × number of floors × 3.3 m average floor height); this is an approximate estimate, not the decree's own calculation, so use your documented figure instead if you have it.

The valuation decree uses a comparative method that sets a separate base price for each region and municipality-size band (Prague is even split into individual zones) — reflecting real regional differences in property prices. The gap is large: under Annex 24 of Decree No. 441/2013 Coll., one m³ of a family house in Prague zone 1 costs over CZK 29,000, versus around CZK 4,100 in Ústí nad Labem. That's why the calculator asks for your region and municipality-size band rather than using one nationwide figure.

Overinsurance is the opposite extreme — the insured sum is higher than the property's actual insurable value. Under Section 2853 of the Civil Code, either party may then propose lowering the insured sum together with a proportional cut in premiums; if the other side doesn't accept within a month, the policy terminates. Overinsurance doesn't get you a bigger payout — the insurer never pays more than the actual loss — it just means you're paying unnecessarily higher premiums. If you don't contractually fix the insurable value, Section 2849 defines it by default as the property's "usual price" (obvyklá cena) at the time of the loss.

The calculator relies on base prices by region and municipality-size band, but it doesn't account for your specific property's condition, fittings or wear — the decree's construction-and-fittings index (I_V), which normally fine-tunes the price across a set of building characteristics (9 to 13, depending on property type), is simplified here to a fixed value of 1.0 ("average standard"). A specific property's real value can therefore differ from the result by roughly ±20–30% depending on its actual condition, fittings and location. The result is an approximate estimate, not an expert valuation or a binding insurance offer.

The regional base construction prices come from Decree No. 441/2013 Coll. (the valuation decree), specifically its comparative method (Annexes 24–27), in the version in force from 1 January 2026. As a legal enactment, it counts as an official work (úřední dílo) under Czech copyright law and can therefore be freely quoted and used without licensing restrictions. The construction-price index comes from open data published by the Czech Statistical Office (product 011041), the legal passages quote the Civil Code (Act No. 89/2012 Coll.), and the underinsurance statistics come from press releases by the Czech Insurance Association (ČAP). The household-contents range (CZK/m²) is the one part of the calculator that isn't based on any official source — it's our own approximate estimate, and it's clearly labelled as such.