Shell House or Turnkey: the Decision Aid 2026
Shell house or turnkey – this question decides tens of thousands of euros and many months of leisure time. This guide provides an honest decision aid with a cost comparison, a realistic own-work check and the main risks. That way you can tell which option suits your budget, time and skills – including sensible intermediate stages.
Shell-completion house (Ausbauhaus) or turnkey – with a prefab house this question decides over tens of thousands of euros and over months of your free time. The shell-completion house entices with a lower purchase price, but in return demands considerable own labour, time and craftsmanship. The turnkey house costs more, but is ready to move into and calculable. Anyone who overestimates the saving or wrongly judges their own capability ends up paying extra. This guide provides an honest decision aid with a cost-comparison calculation, a realistic own-labour check and the most important risks.
What is the difference between a shell-completion house and turnkey?
Short answer: A shell-completion house is erected by the manufacturer only up to a certain stage – usually to the wind- and weather-tight shell – and you take over the remaining interior fit-out as own labour. A turnkey house, on the other hand, is handed over fully ready to move into; all trades except a few remaining works are done. The shell-completion house is cheaper, but costs time, ability and nerves; the turnkey house is more expensive, but plannable and without own labour. In between, in 2026, lie intermediate stages such as the services-ready or the paint-ready house.
"Turnkey" is not a strictly protected term – the exact scope of services is set out in the specification of works. Which fit-out levels there are and what is included in each is explained in detail by the fit-out levels guide. Fundamentals of building ready-to-move-in are provided by the building turnkey guide.
Fit-out levels at a glance (guide values 2026)
| Fit-out level | Manufacturer's service | Your own labour |
|---|---|---|
| Kit house | material delivered | very high – almost everything yourself |
| Shell-completion house | weather-tight shell | complete interior fit-out |
| Services-ready | shell + building services | floors, painting, fine fit-out |
| Paint-ready | almost finished | only painting works |
| Turnkey | ready to move in | no to few remaining works |
Cost comparison: how much does a shell-completion house really save?
Short answer: As a guide value for 2026, a shell-completion house saves around 15 to 35 % of the house price compared to the turnkey variant – with a €300,000 house, therefore, roughly €45,000 to €105,000. This saving, however, is not free money, but the equivalent value of your working time and your material. Anyone who has to hire tradespeople for parts or has mistakes corrected loses a considerable share of the advantage. With an honest calculation, a net saving in the low to mid five-figure range often realistically remains.
Example calculation: 140 m² prefab house (guide values 2026)
| Item | Shell-completion house | Turnkey |
|---|---|---|
| Purchase price manufacturer | approx. €230,000 | approx. €320,000 |
| Material costs own fit-out | approx. €45,000 | included in price |
| External trades (unavoidable) | approx. €20,000 | included in price |
| Own labour (time value) | not paid out | not applicable |
| Total excluding time value | approx. €295,000 | approx. €320,000 |
| Realistic net saving | approx. €25,000 | — |
The example calculation shows: the apparent difference of €90,000 shrinks markedly once material and unavoidable external trades (for instance electrics and sanitary, which often require specialist companies) are taken into account. Calculate your project with the cost calculator and classify the overall framework with the house-building costs guide.
Own-labour reality check: what can you really do yourself?
Short answer: Honestly assessable in 2026 are above all painting works, floor laying, wallpapering, simple drywall works and clearing-up or auxiliary works – here a lot can be done yourself with time and practice. Electrical, gas and sanitary installations as well as load-bearing and energy-relevant works, on the other hand, should be taken over by specialist companies, partly for legal reasons and because of the warranty. Calculate realistically: the complete interior fit-out of a single-family house quickly requires several hundred working hours over many months.
Do not underestimate either the time expenditure or the burden alongside job and family. Anyone who overdoes the own labour risks build delays and a double cost burden of rent and construction financing. Which trades are suitable and how to plan own labour sensibly is explored in depth by the own-labour guide. Anyone who wants to cut costs in general finds further levers in the building cheaply guide.
Assess the 'sweat equity' honestly
Banks partly recognise own labour as equity (so-called sweat equity, "Muskelhypothek"), but usually only to a limited extent and for realistically achievable works. Do not set the value too high – if the planned own labour does not materialise, a financing gap arises. Calculate conservatively and with a buffer.
Shell-completion house or turnkey? Compare both variants
The best route to a decision is a direct offer comparison: have suitable manufacturers offer you both variants as a fixed price and compare costs, services and own share. Free of charge and without obligation from our network.
What risks does the shell-completion house have?
Short answer: The biggest risks of a shell-completion house in 2026 are delays through own labour, underestimated material costs, workmanship mistakes with expensive rectifications, as well as interface problems between manufacturer's and own trades – for instance with warranty and defect liability. In addition there is the danger of a double burden of rent and financing instalments if the move-in is delayed. Anyone who knows and plans for these risks can limit them; anyone who ignores them quickly loses the initial saving again.
- Time risk: own labour often takes longer than planned alongside job and family.
- Cost risk: material prices and unavoidable external trades reduce the saving.
- Quality risk: mistakes during self-fit-out can trigger expensive rectifications.
- Warranty risk: secure a clear demarcation between manufacturer's and own trades.
- Financing risk: factor in a double burden of rent and instalment in case of delay.
Clarify with the manufacturer in writing where their warranty ends and your own labour begins – it is precisely at the interfaces that disputes otherwise arise. What matters in the contract is explained by the checking the construction contract guide.
For whom is which variant suitable?
Short answer: The shell-completion house is suitable in 2026 for manually skilled builders with time, helpers and a taste for doing it themselves, who consciously want to trade money for own labour. The turnkey house suits everyone who wants to build in a plannable way, quickly and without own labour – for instance working people with little free time or families with small children. Anyone who only wants to do individual, simple trades themselves is often best off with an intermediate stage such as the services-ready or paint-ready house.
In the end, the honest self-assessment decides: how much time, ability and resilience do you bring? Compare both variants with concrete offers instead of only looking at the base price. An overview of suitable houses and providers is given by our house overview and the manufacturer overview; to subsequently place brands systematically side by side, you can additionally compare prefab-house manufacturers and draw on the current prefab house prices 2026.
Don't overlook the intermediate stages
The decision is rarely black and white. Between the pure shell-completion house and the turnkey house lie stages such as services-ready or paint-ready. This way you can take over exactly the trades you confidently master and leave the rest to the pro – often the best ratio of saving and risk.
Find the right fit-out level at a fixed price now
Whether shell-completion house, services-ready or turnkey: we connect you free of charge and without obligation with suitable manufacturers with a transparent construction and specification of works. This way you see in black and white which variant is the right one for your budget and your time.
What does your dream house really cost?
Request suitable quotes from vetted manufacturers for free and compare the prices per square metre for your construction project.
Compare house prices nowImportant questions briefly explained
The most common price questions around Shell House or Turnkey – answered concisely by the Prefabricated House editorial team (as of 2026).
