Technically Complete: The Unknown Finishing Stage
Technically complete is the often-overlooked intermediate stage between turnkey and shell house: the manufacturer takes on the shell, the envelope and the complete building services, while you do the visible interior finishing yourself. This guide defines the finishing stage, compares turnkey, technically complete, shell house and kit house in a table, classifies the saving as a range (as of 2026) and shows for whom the variant pays off.
Between the carefree “turnkey” and the affordable shell house (Ausbauhaus) there is an often overlooked intermediate stage: technically finished (technikfertig). At this finishing stage the manufacturer takes on the entire building services – heating, electrics and plumbing are installed – while you carry out the visible interior fit-out yourself. This makes it possible to save noticeably compared with the turnkey house without having to tackle the demanding technical trades yourself. This guide explains what technically finished means exactly, how the four common finishing stages differ and for whom this variant is worthwhile – all saving figures only as ranges, as of 2026. Anyone who prefers to leave the interior fit-out to the provider will find the alternative under building turnkey.
What does the technically finished stage mean?
Short answer: Technically finished (technikfertig) describes a house in which the manufacturer takes on the structural shell, the building envelope and the complete building services: the heating system, electrical installation and plumbing pipes are fully laid and operational. What is missing is the visible interior fit-out – such as plastering and painting the walls, laying the floors, the interior doors and, in part, the sanitary fixtures. The clients carry out this work themselves or commission it individually. Technically finished thus lies exactly between the turnkey house and the classic shell house.
The charm of this stage lies in the fact that precisely the technically demanding and safety-relevant trades – electrics, heating, plumbing – are carried out by a specialist firm. This is exactly where self-builders otherwise often fail or risk warranty problems. The remaining work, by contrast, is well feasible as DIY. Anyone who wants a general overview of the various levels of completion will find the basics in the overview of finishing stages.
The terms are not standardised
“Technically finished” (technikfertig), “fit-out ready” (ausbaufertig) or “paint ready” (malerfertig) are not protected terms. Each manufacturer defines its own scope of services. So always have a detailed construction and specification document given to you, which sets out exactly which trades are included and which you carry out yourself.
The four finishing stages compared
Short answer: Roughly speaking, four finishing stages can be distinguished: turnkey (everything finished, no DIY share), technically finished (services by the professional, interior fit-out yourself), shell house (structural shell plus envelope, a lot of DIY work) and kit house (Bausatzhaus – prefabricated components are largely assembled yourself). From top to bottom, the price falls, while the DIY share and the craftsmanship required rise. Technically finished is the compromise for everyone who wants to save without venturing into electrical, heating and plumbing work.
Finishing stages compared (assessment 2026)
| Finishing stage | Manufacturer’s services | Your DIY share | Saving* |
|---|---|---|---|
| Turnkey | handed over ready to move in | none | reference price |
| Technically finished | shell, envelope, building services | interior fit-out | range |
| Shell house | shell, envelope | interior fit-out + services | larger range |
| Kit house | components delivered | assembly + fit-out | largest range |
*Saving compared with the turnkey variant – only as a range, project-dependent, as of 2026.
The saving grows with the DIY share, but that only holds if you actually manage the work reliably and to a decent quality. With a shell house, and even more so with a kit house, this demands considerable skill, time and perseverance. Technically finished significantly reduces this risk, because the error-prone technical trades are carried out professionally. You should honestly assess how much DIY work is realistic – a good set of questions on this is offered by the guide to the most important questions about the shell house as well as the overview of the shell house as a house type. Whether DIY work or the carefree all-round package suits you better is explored in depth by the comparison shell house or turnkey.
Find the right finishing stage
Whether technically finished, turnkey or shell house – the right choice depends on budget, time and craftsmanship. Compare the offers of several prefab house manufacturers from our network free of charge and have the finishing stages broken down transparently.
How much does the technically finished stage save?
Short answer: The saving potential arises from the saved craftsman’s work for the interior fit-out – above all painting, floor coverings, interior doors and, in part, the final assembly in the bathroom. How high the saving turns out depends on the scope of the trades you take on yourself, the quality of execution and regional craftsman prices. It can seriously only be given as a range. Also factor in materials, tools, rented machines and above all your time – otherwise the actual saving is lower than hoped.
- Painting and wallpapering – well feasible as DIY.
- Lay floor coverings such as laminate, vinyl or tiles yourself.
- Fit interior doors and set frames.
- Simple final assembly in the bathroom in consultation with the plumbing firm.
- Offset material, tool and time costs realistically.
A common thinking error is to value your own time at zero. The interior fit-out of a whole house drags on over many weekends, and anyone with a demanding job may thereby delay moving in – which in turn can cause double housing costs. So calculate not only the pure saving but also the side effects of a long fit-out phase. Also bear in mind that individually commissioned trades are often more expensive than the same service in a manufacturer’s package: anyone who coordinates the interior fit-out themselves has to obtain offers, coordinate dates and take responsibility for the interfaces between the craftsmen. This organisational work costs time and nerves and is readily overlooked in the saving. A realistic schedule with a buffer protects against the construction phase dragging on uncontrollably. Neutral pointers on construction contracts and specifications are provided by the consumer advice centre (Verbraucherzentrale).
Who is technically finished suited to?
Short answer: Technically finished suits craft-savvy clients with sufficient time who want to save on the visible fit-out work but deliberately place responsibility for electrics, heating and plumbing in professional hands. Anyone who has little time, lacks manual skill or needs a fixed move-in date is better served with a turnkey house. Conversely, anyone who is confident of more and can also organise the technical trades themselves saves even more with a classic shell house.
An honest self-assessment is important: not every manual talent is enough for a complete house fit-out. Also check whether your financing bank recognises the planned DIY work – the so-called “muscle mortgage” (Muskelhypothek) – and to what extent. Banks usually credit DIY work only cautiously and depending on the project. Clarify this early so that the calculated saving also reaches the financing.
Fix the scope of services in writing
Have the manufacturer list exactly where the technically finished service ends and your DIY work begins – trade by trade. Only this way do you avoid disputes over interfaces, for example when it is unclear who installs the sanitary fixtures or takes on the final electrical assembly.
Technically finished as a smart middle way
Short answer: The technically finished stage is an underestimated compromise: it lowers the costs compared with the turnkey house but leaves the demanding technical trades to the specialist firm. This makes it suitable for everyone who wants to contribute DIY work without putting safety and warranty for electrics, heating and plumbing at risk. Decisive are a clear specification, realistic scheduling and an honest assessment of your own skills.
Compare several offers and make sure the specifications really reflect the same scope – only then are prices meaningful. A good basis for this is provided by our tool for comparing prefab house manufacturers, as well as the current prefab house prices 2026. Check which trades are included with “technically finished” in each case, because the term is not standardised and is interpreted differently from manufacturer to manufacturer. Anyone who clarifies the interfaces cleanly, plans the DIY work realistically and chooses the finishing stage to suit their own life and financing situation gets the greatest benefit from the technically finished house – a solid home at a noticeably lower price.
From the structural shell to the finished home
Technically finished combines professional building services with a noticeable saving on the interior fit-out. We put you in touch with suitable prefab house providers from our network free of charge and without obligation, who break down the finishing stages transparently.
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