Prefab House 100 sqm: Costs, Floor Plan and Sample Calculation 2026
100 square metres is the classic entry size into home ownership. This guide quantifies the costs for a prefab house of 100 m² by finishing stage, shows sensible floor-plan ideas and works through a complete example. That way you see whether 100 m² is enough for your project – with benchmarks for 2026.
100 square metres is considered the classic entry-level size for a home of your own: enough space for two to four people, yet compact enough to keep construction and running costs manageable. Anyone planning a prefabricated house (Fertighaus) of around 100 m² in 2026 will find a wide price range depending on the completion stage – from an affordable shell house (Ausbauhaus) for DIY finishing to a turnkey (schlüsselfertig) complete package. This guide puts realistic figures on the cost of a 100 m² prefab house, shows sensible floor-plan ideas and works through a complete example – so you can judge whether 100 m² is enough for your project (2026 price level, guide values).
What does a 100 m² prefab house cost in 2026?
Short answer: As a guide value, a prefab house of around 100 m² costs between approx. €200,000 and €330,000 in 2026 – excluding the plot and construction-related additional costs. A shell house for DIY finishing starts at around €140,000 to €190,000, a technical prefab house (Technikfertighaus) is around €190,000 to €250,000, and a turnkey house is around €250,000 to €330,000. The square-metre price thus ranges between approx. €2,000 and €3,300. The specification, energy standard and region significantly influence the final price.
The wide range is explained above all by the completion stage: anyone who takes on a lot themselves saves on the purchase but invests time and bears the risk for the quality of the DIY work. Added to this are factors such as roof shape, basement or floor slab, the chosen efficiency standard and the fittings of the bathroom and kitchen. A first overview of all the cost blocks of a new build is given in the house-building costs guide; your own estimate is provided by the cost calculator. How square-metre prices are currently developing is shown by the prefab house prices 2026.
100 m² prefab house: prices by completion stage 2026 (guide values, excluding plot)
| Completion stage | What is included | Price range | €/m² |
|---|---|---|---|
| Shell house (Ausbauhaus) | wind-tight, interior finished by you | €140,000–190,000 | €1,400–1,900 |
| Technical prefab house | building services installed, rest by you | €190,000–250,000 | €1,900–2,500 |
| Turnkey (standard) | ready to move in, without floor coverings/painting | €230,000–290,000 | €2,300–2,900 |
| Turnkey (complete) | ready to move in incl. painting & floors | €250,000–330,000 | €2,500–3,300 |
Who is 100 m² of living space enough for?
Short answer: In 2026, 100 m² of living space is comfortably enough for a single-person household, a couple or a small family with one or two children. With a well-thought-out floor plan, three bedrooms, a living-dining area, a bathroom and a guest WC can be accommodated. For families with three or more children, a home office plus a guest room, or generous room layouts, it becomes tight – here 120 to 150 m² offers more room to manoeuvre. What matters is less the pure floor area than a space-efficient floor plan without long hallways.
Anyone planning with 100 m² today but who may need more space later should think about future extensions from the outset – for example a convertible attic. That keeps the house flexible without raising the initial investment. Whether 100 m² is enough in the long run also depends on your life planning; so deliberately compare it with the next size up in the 120 m² prefab house guide.
Floor-plan ideas for 100 m²
Short answer: At 100 m², an open living, dining and cooking area works well as the centrepiece, complemented by two to three bedrooms and a bathroom with an optional guest WC. The space becomes liveable through short hallways, cleverly placed storage and a staircase in a central position. Popular options are the single-storey bungalow (everything on one level) and the compact single-family home with two full storeys or a ground floor plus a converted attic. A space-efficient layout saves real money, because less circulation area has to be built and heated.
- An open living-cooking-dining area saves walls and feels more spacious than separate rooms.
- Place the staircase centrally to avoid long hallways — every square metre of hallway costs living space.
- Position wet rooms (bathroom, guest WC, kitchen) above or next to each other; this shortens pipe runs.
- Plan storage under the stairs, in the utility room and in recesses.
- Prefer a bungalow if step-free access or a retirement home matters — but it needs more plot.
Whether single-storey or two-storey – the building form affects both plot requirements and costs. An overview of the house types is provided by the bungalow and single-family home pages. Anyone wanting to understand the completion stages in detail will find them in the completion stages guide. Anyone needing more space can compare with the 150 m² prefab house guide.
100 m² prefab house: compare concrete fixed prices now
Prices for a 100 m² house vary by up to €130,000 depending on the completion stage. Instead of guessing, a direct comparison of several manufacturers with a clear construction and specification description pays off. Request suitable offers from our network free of charge and without obligation.
Sample calculation: turnkey 100 m² prefab house
Short answer: As an example, a turnkey 100 m² prefab house costs around €270,000 for the building alone in 2026. Adding the plot, construction-related additional costs (notary, real estate transfer tax [Grunderwerbsteuer], servicing, building permit) and outdoor works, a whole project ends up at approx. €380,000 to €480,000 in many regions. The additional costs alone account for around 15 to 20 % of the construction sum. The figures are guide values; regional plot prices shift the total the most.
Example project: turnkey 100 m² prefab house 2026 (guide-value scenario)
| Cost block | Guide value | Note |
|---|---|---|
| Turnkey prefab house | €270,000 | approx. €2,700/m² |
| Plot (400 m²) | €80,000–200,000 | heavily regional, here: €120,000 |
| Construction-related additional costs | €45,000 | notary, tax, servicing, permit |
| Outdoor works | €20,000 | access road, terrace, garden |
| Total (example) | approx. €455,000 | pure guide-value scenario |
How the region changes the final price
The plot is the biggest cost lever. While a building plot in a rural area often costs under €150 per square metre in 2026, prices in sought-after conurbations are many times higher. The prefab house itself, by contrast, is comparably expensive nationwide. Anyone flexible about location can quickly save a six-figure sum on a 100 m² project.
Where can you genuinely save on 100 m²?
Short answer: In 2026, savings on a 100 m² house are achieved above all through the completion stage, a compact floor plan and a simple building volume. A shell house with DIY work significantly lowers the purchase price, a rectangular building body with a gable roof is cheaper than lots of bays and dormers, and doing without a basement saves a five-figure sum. What you should not skimp on is insulation, windows and building services – here quality quickly pays for itself through lower energy costs and funding.
How much DIY work is realistic and which trades are suitable for it is explained in the DIY work guide. Further saving strategies – from choosing the plot to the fittings – are bundled in the building affordably guide. Concrete price classes of the cheapest houses can be found in the affordable prefab houses guide, and fully calculated scenarios in the house-building cost examples guide.
Funding and financing for a 100 m² house
Short answer: For an energy-efficient 100 m² prefab house, the main option in 2026 is the KfW programmes for climate-friendly new builds, which provide low-interest loans. Whether and how much funding is available depends on the efficiency standard the house achieves. For the financing, the usual rules apply: ideally 20 % equity plus purchase-related additional costs, repayment from around 2 %, and a realistic buffer for the unforeseen. A compact 100 m² house is easier to finance than a large property.
The current programmes and prerequisites are explained in the KfW funding 2026 guide. The basics of interest rate, repayment and term are bundled in the construction financing 2026 guide, and the role of equity is clarified in the equity guide.
Your 100 m² prefab house at a transparent fixed price
A clear fixed price with a complete construction and specification description protects against extra charges. We put you in touch, free of charge and without obligation, with suitable manufacturers who build houses of around 100 m² – so you know your total costs before you sign.
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 Prefab House 100 sqm – answered concisely by the Prefabricated House editorial team (as of 2026).
