Owner-Builder Insurance 2026: What Is Mandatory and What Pays Off
For months a house build ties up a six-figure sum – and numerous risks lurk on the building site. This guide presents the four important construction insurances of 2026: owner-builder liability, construction performance, fire on the shell, and builder's helper accident (BG BAU) as well as buildings insurance from acceptance. With costs, cover sums and advice on what is mandatory and what is merely sensible.
Building a house ties up a six-figure sum over months – and numerous risks wait on the construction site: a storm tears open the freshly roofed shell, a passer-by falls into the open excavation pit, a construction helper injures themselves while laying the screed pipes. Without the right insurance cover, you as the builder are liable in case of doubt with your entire assets. This guide shows which four insurances are really sensible in 2026, what each costs, which is mandatory and where you can save without hesitation.
Which insurances builders actually need in 2026
Short answer: Four policies form the foundation of builder protection in 2026: builder's liability insurance (Bauherrenhaftpflicht) covers damage caused to third parties on your construction site; construction performance insurance (Bauleistungsversicherung) replaces damage to the building being erected itself; fire shell insurance (Feuerrohbauversicherung) covers fire, lightning and explosion during the construction period (later it converts into the residential building insurance); and construction helper accident insurance protects private helpers. The only legally prescribed requirement is the registration of the construction helpers with the BG BAU – all the rest are voluntary but strongly recommended.
Anyone who has a turnkey house built shifts many risks to the construction company – nevertheless you as the builder remain responsible for your plot and for your own helpers. Anyone who does a lot as owner contribution needs the protection all the more urgently. Therefore check early which risks your construction company already covers (often the construction performance insurance) and which you have to secure yourself. What the process looks like in detail you can read in the house building process guide.
The insurances for house building in 2026 at a glance
| Insurance | Covers | Mandatory? | Guideline costs construction phase |
|---|---|---|---|
| Builder's liability | damage to third parties on the site | sensible (practically mandatory) | €80–250 |
| Construction performance | damage to the building itself | very sensible | €200–600 |
| Fire shell insurance | fire/lightning/explosion on the shell | very sensible | usually free* |
| Construction helper accident (BG BAU) | accidents of private helpers | statutory reporting obligation | from approx. €100/year |
| Residential building insurance | finished house from acceptance | sensible (often a loan condition) | €300–700/year |
* Fire shell insurance is usually included during the construction period without an additional premium, provided you subsequently take out the residential building insurance with the same insurer.
Builder's liability: protection against expensive personal injury
Short answer: Builder's liability insurance applies when a third party is harmed on or by your construction site – for example a pedestrian who falls into an unsecured excavation pit, or a parked car struck by falling material. As the builder, you bear the duty of care to ensure safety (Verkehrssicherungspflicht) for the entire plot. If serious personal injury occurs, lifelong pension payments in the six- to seven-figure range threaten. The policy costs usually 80 to 250 euros for the entire construction period for a single-family house in 2026 – one of the cheapest and at the same time most important safeguards of all.
Pay attention to a coverage sum of at least 3 million euros as a lump sum for personal injury and property damage; 5 to 10 million euros is rather recommended, since the premium difference is small. Also check whether owner contributions are co-insured – this is crucial, especially with finishing-stage or kit houses. Many private liability tariffs already include construction projects up to a certain construction sum (often 50,000 to 150,000 euros); above this limit you need a standalone builder's liability insurance.
First check your own private liability insurance
Before you take out a separate builder's liability insurance, take a look at the conditions of your existing private liability insurance. Numerous modern tariffs cover construction projects up to 50,000 euros or even 150,000 euros construction sum free of charge. If your project is above that – which is the rule for a new build – you need the standalone policy. A short call to the insurer saves you a double payment in case of doubt.
Construction performance insurance: securing protection for the building itself
Short answer: Construction performance insurance (Bauleistungsversicherung, formerly "Bauwesenversicherung") replaces unforeseen damage to the building being erected and to the building materials already delivered. This includes storm and flood damage to the shell, vandalism, the theft of permanently installed parts, construction faults or frost damage to fresh masonry. Not covered are normal weather influences, fire (covered by the fire shell insurance) and simple theft of unfitted goods. The costs in 2026 are around 200 to 600 euros for the construction phase, depending on construction sum and deductible.
Good to know: until the acceptance, the risk for the work generally lies with the construction company (§ 644 BGB). In practice, however, disputes often arise about who pays for damage – and storm damage to a half-finished roof can easily cost five-figure amounts. Construction performance insurance ensures that the repair is paid quickly, regardless of the question of fault. Many construction companies already take out the policy for their own trade – have this confirmed in writing and close the gap for your owner contributions yourself. Details on the transfer-of-risk rule can be found in the building acceptance & warranty guide.
- Align the cover to the full construction sum including owner contributions and builder-supplied items.
- Explicitly include theft of permanently installed parts (heating, sanitary, windows).
- Choose the deductible deliberately: €250–500 noticeably lowers the premium.
- Add flood/backwater only in at-risk locations, but there without fail.
- Obtain confirmation from the construction company on which trades are already insured.
First know the prefabricated house price, then calculate the insurance sum
The construction sum is the basis of assessment for almost every construction insurance. Compare the fixed-price quotes of several manufacturers from our network for free – this way you know your exact construction sum and can set coverage sums precisely.
Fire shell insurance: fire protection during the construction period
Short answer: Fire shell insurance covers damage from fire, lightning strike and explosion to the building under construction – a real risk, since roofing and welding work, temporary electrics and stored building materials noticeably increase the fire hazard on the construction site. The clever part: with most insurers this policy is free of premium for the construction period (usually up to 12 months) if you subsequently take out the residential building insurance with the same provider. Therefore apply for it early – ideally before construction begins.
Without fire shell insurance you would face financial ruin after a fire: the shell would be destroyed, the loan continues to run, and the construction performance insurance precisely does not apply in the case of fire. As soon as the house is ready to move in and accepted, the protection converts seamlessly into the full residential building insurance. When taking it out, clarify exactly from which point in time which contract applies, so that no coverage gap arises between the shell and the finished house.
Construction helper accident insurance and BG BAU: the only mandatory insurance
Short answer: If private supporters – friends, relatives or neighbours – help unpaid on your construction site, you must by law register them with the Employers' Liability Insurance Association for the Construction Industry (Berufsgenossenschaft der Bauwirtschaft, BG BAU) within one week of the construction start. This is the only real insurance obligation for builders. The BG BAU covers work accidents of the helpers to the statutory extent (medical treatment, pension). The premium depends on the helper hours rendered and starts at around 100 to 200 euros per year in 2026. Anyone who misses the registration risks a fine of up to 2,500 euros – and may be personally liable in the event of an accident.
However, the statutory protection of the BG BAU only reaches so far: it is measured against the rather low minimum annual earnings and covers neither the helper's full income nor damages for pain and suffering. Therefore, an additional private construction helper accident insurance with a disability and death sum is advisable. In 2026 it costs, depending on scope and number of helpers, about 100 to 300 euros for the entire construction period and protects both your helpers and your personal relationship with them should a serious accident occur.
Also register paid helpers correctly
If you pay your helpers money or benefits in kind for their assistance, they may count as marginally employed and additionally have to be registered with the Minijob Centre (Minijob-Zentrale). "Undeclared work" on your own construction site is severely penalised and voids any insurance cover in the event of a claim. Register all helpers cleanly – the small premiums are out of all proportion to the risk.
Residential building insurance: protection from the building acceptance
Short answer: With the building acceptance, the construction-period protection ends and the residential building insurance takes over: it replaces damage to the finished house from fire, tap water, storm and hail – on request supplemented by natural hazard damage (flooding, heavy rain, landslide). The financing bank usually requires it as a loan condition. The costs in 2026 are 300 to 700 euros per year for a single-family house, depending on construction type, living space, region and chosen scope of services. Protection against natural hazard damage is gaining importance in view of increasing heavy-rain events and is affordable in many places.
With residential building insurance, pay attention to the "sliding new value" (gleitender Neuwert): it ensures that in the event of a claim the full rebuilding costs are reimbursed at the current price level – an important protection against underinsurance in times of rising construction prices. You should include natural hazard damage in almost any location; the extra costs are usually manageable, whereas the protection against heavy rain is priceless. With energy-efficient houses with expensive technology (heat pump, photovoltaics), cover that explicitly includes these systems is worthwhile.
How hazard zones, premiums and scope of services are connected for natural hazard protection in new builds is explored in depth by the guide natural hazard insurance for new builds: costs, zones & protection.
Where builders can save – and where better not
Short answer: Savings can be made in 2026 via three levers: a deliberately chosen deductible (€250 to 500 noticeably lowers the premium), bundling fire shell and residential building insurance with the same provider (the construction-period cover is then usually free) and forgoing double cover if the construction company already covers certain risks. You should not save on the liability coverage sum and on natural hazard protection – here existence-threatening sums threaten in an emergency. A builder's legal expenses insurance, on the other hand, is rarely necessary if the construction contract has been checked cleanly.
Association-wide consumer information on the individual construction insurance lines is provided by the German Insurance Association (Gesamtverband der Deutschen Versicherer, GDV).
- Compare quotes from at least three insurers – the premiums vary widely.
- Take the fire shell cover free of charge via the later residential building insurance.
- Avoid double insurance: clarify what the construction company already covers.
- Choose the liability coverage sums generously – the extra premium is small.
- Do not optimise away natural hazard protection, especially with a heavy-rain risk.
- Register construction helpers with the BG BAU without gaps to avoid a fine and liability.
Closely connected with the insurance cover is a cleanly worded construction contract: anyone who clearly regulates which trades the company is responsible for and when the risk transfers avoids coverage gaps and disputes in the event of a claim. How to check your contract is shown by the guide to checking the construction contract. You can look up technical terms around construction and law in the construction glossary. How the insurance cover fits into the overall process is shown by the guide to buying a prefabricated house.
Plan construction insurance reliably – with the right fixed-price house
A transparent fixed-price contract forms the best basis for setting insurance sums precisely. We connect you free of charge and without obligation to suitable manufacturers with a clear construction and services specification – so that you know your construction sum before you sign the first policy.
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Compare house prices nowImportant questions briefly explained
The most common price questions around Owner-Builder Insurance 2026 – answered concisely by the Prefabricated House editorial team (as of 2026).
