Home Building Cost Examples 2026: Four Projects Fully Calculated
"What does a prefab house cost?" can only be answered with a concrete project. This guide works through four typical projects from A to Z: bungalow 90 m², detached house 120 m², detached house 150 m² with basement and a semi-detached house. All calculations are expressly to be understood as benchmark scenarios for 2026.
"What does a prefab house cost?" — the question can only be answered seriously with a concrete project, because the price depends on size, building form, completion stage, plot and region. That is why this guide works through four typical projects from A to Z: a bungalow with 90 m², a detached house with 120 m², a larger detached house with 150 m² and a basement, and a semi-detached house half. All calculations are expressly to be understood as guide-value scenarios — not real individual cases, but comprehensibly constructed calculations with ranges (price basis 2026). This way you see which items arise and how the total is composed. For general orientation, the prefab house prices 2026 help.
Important note on the examples
The following four calculations are constructed guide-value scenarios for the year 2026 and not real, documented building projects. They serve as orientation. Your actual costs depend on the region, subsoil, fittings and provider. Use the examples as a framework and obtain several offers for your specific project.
What does a prefab house cost on average in 2026?
Short answer: As a rough guide, a turnkey prefab house costs between approx. €2,400 and €3,300 per square metre of living space in 2026 — without the plot. For a typical detached house of 120 to 150 m², that means around €320,000 to €490,000 for the building alone. Together with the plot, ancillary construction costs and external works, many total projects land between approx. €380,000 and €660,000. The concrete sum is determined above all by the plot price, the completion stage and the fittings.
To classify a build cost correctly, it helps to break it down into blocks: house, plot, ancillary construction costs and external works. That is exactly how the four scenarios below proceed. Your own estimate is provided by the cost calculator, and the overall overview of all cost types by the house-building costs guide.
Scenario 1: bungalow with 90 m²
Short answer: A turnkey bungalow with 90 m² costs, in this guide-value scenario for 2026, around €260,000 for the building (approx. €2,900/m², higher because of the large roof area per unit of living space). With a rather large plot (bungalows need a lot of footprint), ancillary construction costs and external works, this gives a total of approx. €430,000. The bungalow is suitable for couples, small families and barrier-free living on one level.
Scenario 1 — bungalow 90 m² turnkey 2026 (guide values)
| Cost block | Guide value | Note |
|---|---|---|
| Bungalow turnkey | €260,000 | approx. €2,900/m² |
| Plot (600 m²) | €120,000 | a bungalow needs a lot of area |
| Ancillary construction costs | €44,000 | approx. 17 % of the build cost |
| External works | €18,000 | driveway, terrace, garden |
| Total | approx. €442,000 | guide-value scenario |
The higher price per square metre is explained by the proportionally large roof and footprint of a single-storey house. Details on the building form are shown on the page bungalow. How the bungalow compares with a compact two-storey house you can see in the comparison with the prefab house 100 m² guide. All price drivers in detail are explained by the guide building a bungalow: costs, and the pure fixed prices are bundled by the guide bungalow turnkey: prices.
Scenario 2: detached house with 120 m²
Short answer: A turnkey detached house with 120 m² costs, in this guide-value scenario for 2026, around €320,000 for the building (approx. €2,700/m²). With a medium-sized plot, ancillary construction costs and external works, this gives a total of approx. €530,000. This family standard size offers space for four to five people and counts as the most common new-build project.
Scenario 2 — detached house 120 m² turnkey 2026 (guide values)
| Cost block | Guide value | Note |
|---|---|---|
| Prefab house turnkey | €320,000 | approx. €2,700/m² |
| Plot (450 m²) | €135,000 | medium price level |
| Ancillary construction costs | €54,000 | approx. 17 % of the build cost |
| External works | €22,000 | driveway, terrace, garden |
| Total | approx. €531,000 | guide-value scenario |
The price ranges of this size by completion stage and construction method are explained by the prefab house 120 m² guide. Anyone who wants to save on this project will find approaches in the building cheaply guide and with the cheap prefab houses.
Have your project worked through concretely
Examples give orientation — your real price only emerges from concrete offers for your region and fittings. Request several fixed-price offers from suitable manufacturers from our network free of charge and without obligation, and compare.
Scenario 3: detached house with 150 m² and basement
Short answer: A turnkey detached house with 150 m² and a basement costs, in this guide-value scenario for 2026, around €400,000 for the building plus approx. €55,000 for the basement. With a larger plot, ancillary construction costs and external works, this gives a total of approx. €660,000. The basement creates a lot of additional usable space for building services, hobbies and supplies, but noticeably drives up the build cost.
Scenario 3 — detached house 150 m² with basement turnkey 2026 (guide values)
| Cost block | Guide value | Note |
|---|---|---|
| Prefab house turnkey | €400,000 | approx. €2,700/m² |
| Basement | €55,000 | fully basemented |
| Plot (550 m²) | €165,000 | medium to upper level |
| Ancillary construction costs | €77,000 | approx. 17 % of house + basement |
| External works | €25,000 | driveway, terrace, garden |
| Total | approx. €722,000 | guide-value scenario |
Whether a basement is worthwhile depends on the subsoil and the space requirement. The price ranges and building forms of this comfort size are explained by the prefab house 150 m² guide. How the individual ancillary costs are composed is shown by the ancillary construction costs guide. For projects of this magnitude, the guide on construction financing from €500,000 is worthwhile.
Scenario 4: semi-detached house half
Short answer: A turnkey semi-detached house half with 110 m² costs, in this guide-value scenario for 2026, around €280,000 for the building (approx. €2,550/m²). The big advantage: the plot costs are shared by two parties, and the common dividing wall saves components. With a proportionate plot, ancillary construction costs and external works, this gives a total of approx. €420,000 — often cheaper than a detached house of the same living space.
Scenario 4 — semi-detached house half 110 m² turnkey 2026 (guide values)
| Cost block | Guide value | Note |
|---|---|---|
| Semi-detached house half turnkey | €280,000 | approx. €2,550/m² |
| Plot share (300 m²) | €90,000 | shared plot costs |
| Ancillary construction costs | €47,000 | approx. 17 % of the build cost |
| External works | €16,000 | smaller garden share |
| Total | approx. €433,000 | guide-value scenario |
The semi-detached house half is a proven way to build affordably in sought-after locations. Details on the building form are shown on the page semi-detached house.
The four scenarios in direct comparison
Short answer: In direct comparison, the total costs of the four guide-value scenarios for 2026 range from approx. €430,000 (bungalow 90 m²) through €433,000 (semi-detached house half) and €531,000 (detached house 120 m²) up to around €722,000 (detached house 150 m² with basement). Besides the living space, the biggest cost driver is the plot; after that come special items such as a basement. The ancillary construction costs are around 15 to 20 % of the build cost in all scenarios and must never be forgotten.
Other house types have their own price frameworks: figures for a representative property are provided by the guide building a town villa: costs, prices for solid timber construction by the guide log house prices and guide values for several units by the guide building an apartment building: costs.
All four scenarios 2026 compared (guide values)
| Scenario | Living space | Building | Total incl. plot |
|---|---|---|---|
| Bungalow | 90 m² | €260,000 | approx. €442,000 |
| Semi-detached house half | 110 m² | €280,000 | approx. €433,000 |
| Detached house | 120 m² | €320,000 | approx. €531,000 |
| Detached house with basement | 150 m² | €455,000 | approx. €722,000 |
- Work through each project in four blocks: house, plot, ancillary construction costs, external works.
- Always factor in ancillary construction costs at 15–20 % of the build cost.
- Check the plot price regionally — it shifts the total the most.
- Plan for a buffer of 5–10 % for the unforeseen.
- Compare several offers with an identical construction and services description.
Do not forget ancillary construction costs and a buffer
The most common mistake in the calculation is to look only at the house price. Property transfer tax, notary, land register, utility connection, soil survey and building permit quickly add up to 15 to 20 % of the build cost. Anyone who plans for these items and a buffer for the unforeseen from the outset avoids financing gaps. The basics are bundled by the construction financing 2026 guide.
From the example to the real offer
These scenarios show the order of magnitude — you only know your real price with concrete offers. We connect you free of charge and without obligation to suitable manufacturers with a clear fixed price, so that you can calculate your project with confidence.
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 Home Building Cost Examples 2026 – answered concisely by the Prefabricated House editorial team (as of 2026).
