Building an Apartment House: Costs per Dwelling and Square Metre 2026
An apartment house in prefab construction spreads the construction costs and letting risk across several dwellings. This guide quantifies the costs per square metre and dwelling, works through examples for 3 to 6 flats, objectively classifies the profitability and shows which KfW funding is available in 2026.
Building a multi-family house (Mehrfamilienhaus) is the supreme discipline of private construction: more living space, several dwelling units and – with clever planning – the prospect of rental income. At the same time, the requirements for fire protection, sound insulation, structural engineering and financing rise significantly with the number of apartments. Prefabricated construction with serial prefabrication can be a powerful lever here, because it shortens the build time and makes costs predictable. This guide quantifies the costs per dwelling unit and per square metre, works through examples for 3 to 6 dwelling units, gives a level-headed assessment of the economics and shows which subsidies apply in 2026. With our calculator you can calculate prefab house costs and play through different fit-out levels individually. A smaller alternative with just one additional unit is explained in the guide on building a house with a granny flat.
What does building a multi-family house cost per square metre?
Short answer: The pure construction costs for a multi-family house in 2026 are, turnkey, usually between €2,400 and €3,600 per square metre of living space – excluding land and ancillary construction costs. In prefabricated construction the square-metre price often sits in the middle of this range, because serial prefabrication saves costs. On top come the land, servicing (Erschließung), ancillary construction costs, outdoor facilities and parking spaces, which raise the total price by 20 to 40 percent depending on the region and standard. The more dwelling units that share the servicing, stairwell and building services, the cheaper the individual unit becomes.
The square-metre price depends heavily on the energy standard and on the specification. A multi-family house at the minimum standard of the Building Energy Act (GEG, Gebäudeenergiegesetz) with a simple specification sits at the lower end, while an efficiency house with a heat pump, photovoltaics and a higher-end specification sits at the top. Because higher efficiency standards improve eligibility for subsidies, the additional investment often pays off over time. The basics of the individual cost blocks are explained in the guide Building costs.
Another important cost factor is the number of storeys. A three-storey multi-family house uses the plot more efficiently than a sprawling flat building and spreads the comparatively expensive components – foundation and roof – across more living space. However, above a certain height additional requirements such as a lift or a second escape route may be added, which partly eat up the advantage. The economically optimal building form therefore always results from the interplay of plot layout, development plan (Bebauungsplan), number of storeys and the requirements tied to them – a point that an experienced provider can calculate for you in the preliminary design.
Cost blocks for a multi-family house (guide values 2026)
| Cost block | Share / guide value | Note |
|---|---|---|
| Pure construction costs (living space) | €2,400–3,600/m² | turnkey, excluding land |
| Land | varies greatly by region | biggest spread factor |
| Ancillary construction costs | 15–20 % of construction costs | planning, permit, surveys |
| Servicing | depends on the location | connections, road if applicable |
| Outdoor facilities & parking | mind parking obligation | often required per dwelling unit |
What does a multi-family house with 3 to 6 dwelling units cost?
Short answer: For a multi-family house with three dwelling units and around 250 m² of living space, in 2026 you can expect roughly €650,000 to €900,000 in pure turnkey construction costs; with six dwelling units and around 500 m², roughly €1.2 to €1.8 million. Costs per dwelling unit fall as the number of apartments rises, because the stairwell, basement, building services and servicing are spread across more units. Land, ancillary construction costs and outdoor facilities come on top in each case and account for the biggest regional difference.
Sample calculation of construction costs by number of dwelling units (excluding land)
| Dwelling units | Total living space | Turnkey construction costs | per dwelling unit |
|---|---|---|---|
| 3 units | ≈ 250 m² | €650,000–900,000 | ≈ €220,000–300,000 |
| 4 units | ≈ 340 m² | €850,000–1,200,000 | ≈ €210,000–300,000 |
| 6 units | ≈ 500 m² | €1.2–1.8 million | ≈ €200,000–300,000 |
These figures are deliberate market ranges and do not replace an individual calculation – the actual price depends on the floor plan, number of storeys, basement, specification and energy standard. If you are planning a two-family house instead of a multi-family house, you will find a dedicated overview on our page about the two-family house. A compact overview of the house type itself is provided by the page Multi-family house.
Costs per dwelling unit fall with size
The most important cost lever for a multi-family house is scaling: a shared stairwell, a shared central heating plant and shared servicing are spread across more apartments. That is why the individual dwelling unit in a six-family house is usually cheaper than in a three-family house. But bear in mind that more units can also trigger higher requirements for fire and sound protection.
What advantages does serial prefabricated construction offer?
Short answer: For a multi-family house, serial prefabricated construction offers above all time savings and cost certainty: walls, ceilings and entire modules are prefabricated in the factory independent of the weather and assembled on the building site in a short time. This often shortens the build time compared to conventional solid construction (Massivbau) by several months and reduces site risks. At the same time, recurring floor plans and standardised elements allow a precise fixed-price calculation – an important advantage when several dwelling units have to be financed.
Serial and modular construction is also promoted politically, because it creates affordable housing faster. How repeatable types play out on a large scale is explored in the guide on Serial residential construction. For private builders this means: those who accept recurring apartment floor plans benefit most from prefabrication. Individual special requests per apartment, on the other hand, partly cancel out the cost advantage again. A neutral overview of providers that build multi-family houses in prefabricated construction can be found in our manufacturer overview and in the comparison of multi-family house prefab providers compared.
Another advantage of prefabricated construction is the high schedule reliability: because the components are manufactured in the factory independent of the weather, rain, frost and scarce tradesperson capacity on the building site play a smaller role. This is particularly valuable for a multi-family house, because every month of build time costs interest and – where letting is planned – delays rental income. The shorter build time therefore indirectly improves the economics. Important, however, is a load-bearing plot and good access, because the prefabricated elements are set by crane and need sufficient space for delivery and assembly.
Compared to conventional solid construction, prefabricated construction is not automatically cheaper, but above all faster and more predictable to plan. Whether timber or solid prefabricated construction is more economical depends on the specific project, the energy standard and the provider. What matters is less the construction method itself than a complete, comparable specification of works – only then can offers be fairly compared.
Calculate a multi-family house in prefabricated construction
Whether as an investment or for several generations: a fixed price creates planning certainty across all dwelling units. Request offers from suitable manufacturers free of charge and without obligation, and compare construction and specification descriptions before you commit.
Is a multi-family house worthwhile as an investment?
Short answer: Whether a multi-family house is worthwhile as an investment depends on the relationship between total costs, achievable rent and financing terms – there are no blanket promises of returns. In principle, a multi-family house spreads the letting risk across several units and achieves lower costs per apartment thanks to shared servicing. What is decisive are a realistic rent calculation, a sufficient buffer for maintenance and vacancy, and solid financing. This assessment is not investment advice; an individual review by a tax adviser and financing experts is essential.
- Set total costs realistically: fully capture construction costs, land, ancillary construction costs and outdoor facilities.
- Calculate rental income conservatively and base it on local market rents.
- Plan reserves: maintenance, vacancy and management reduce the net rent.
- Set up financing soundly: sufficient equity, an affordable instalment over the entire term.
- Clarify tax aspects (depreciation, deductible expenses) with a tax adviser.
Not investment advice – have it checked individually
The figures given here are general market ranges and not a recommendation to buy or build. Whether a specific project pays off depends on your personal situation, the location and the financing. Have every investment decision reviewed by independent professionals, for instance by a tax adviser and a neutral financing consultant.
What subsidies are available for building a multi-family house?
Short answer: For the new build of a multi-family house, in 2026 the main candidates are the KfW programmes for climate-friendly new construction (Klimafreundlicher Neubau): they offer low-interest loans if the building reaches a high energy standard (for example efficiency-house level 40 with sustainability requirements). The subsidy is granted per dwelling unit, which particularly benefits multi-family houses. In addition, depending on the federal state, there are programmes from the state development banks as well as grants for individual measures. Because the terms and programme names change regularly, you should check the current status directly before applying.
The order matters: KfW subsidised loans generally have to be applied for before construction starts, usually via the financing bank. The current programme details are published by the KfW; background on new-build subsidies can be found at the Federal Ministry for Housing, Urban Development and Building. A structured overview of the programmes relevant to building a house is provided by our guide Subsidies; the specifics of new rental housing construction are explored in the guide on multi-family house subsidies.
For the subsidy to be worthwhile, the higher energy standard should be built into the planning from the start and not added on afterwards. Efficiency- boosting measures such as a good building envelope, a heat pump and photovoltaics do increase the build cost initially, but they lower operating costs over the entire service life and improve lettability. In a multi-family house with several dwelling units, both the subsidy amounts and the saved energy costs add up – the economic effect is therefore often more pronounced than for a single-family house. Have the specific eligibility and the appropriate efficiency level checked early by an energy consultant and your bank.
What should you consider regarding fire protection, sound insulation and parking?
Short answer: The technical requirements rise with the number of dwelling units: above certain building sizes and storey counts, stricter fire-protection (Brandschutz) requirements apply, with fire-resistant components, secured escape routes and, where applicable, a second escape route. The sound insulation between the apartments must be ensured in accordance with DIN 4109 – for rented units an increased standard is recommended to avoid disputes. On top comes the parking obligation set by state law, which usually requires one to two parking spaces per dwelling unit and helps determine both space and costs.
These requirements directly affect the costs: a second escape route, a lift above a certain number of storeys or an underground car park can noticeably raise the square-metre price. It is therefore worth planning the building height and the number of storeys deliberately: those who stay just below a threshold that triggers stricter requirements often save considerable sums. An experienced provider of multi-family houses in prefabricated construction knows these thresholds and plans economically accordingly.
- Fire protection: clarify requirements by building class early with the provider.
- Escape routes: mind the second escape route and, where applicable, the lift obligation above a certain number of storeys.
- Sound insulation: plan for increased sound insulation between the apartments, especially when letting.
- Parking: check the state-law parking obligation per dwelling unit (often one to two per unit).
- Accessibility: above a certain number of apartments, barrier-free units may be required.
Standardising floor plans saves twice over
Recurring apartment floor plans not only lower the construction costs through prefabrication, but also simplify letting and maintenance later on. Identical bathrooms, identical kitchen connections and identical window dimensions mean fewer special parts and lower maintenance costs over the entire service life. Individual specification can still be implemented per apartment in the interior fit-out.
Which mistakes drive up the costs of a multi-family house?
Short answer: In 2026 the most expensive mistakes usually arise in the planning: incompletely calculated ancillary costs, a building design just above a fire-protection-relevant threshold, too many individual special requests per apartment, and an overly optimistic rent and return calculation. An underestimated servicing and parking effort and a reserve for maintenance that is too tight also regularly lead to nasty surprises. Those who set total costs, requirements and financing realistically from the outset avoid most of these cost drivers.
A common error of thinking is to look only at the pure construction costs per square metre and to leave out land, ancillary construction costs, outdoor facilities and parking spaces. Together, these items quickly make up 30 percent or more of the total budget. Also calculate a maintenance reserve of around one to two euros per square metre per month – with several dwelling units this adds up to a relevant amount that secures the economics over the years. How costs are currently developing is shown by the prefab house prices 2026.
Anyone planning a multi-family house should also not underestimate the later management: several tenant parties mean regular service-charge statements, maintenance, re-letting and being available when problems arise. These tasks can be handled yourself or outsourced to a property manager – the latter costs money but relieves the burden and is often sensible with several units. Factor these ongoing costs into your calculation so that the initially attractive maths also works out in operation. If you would prefer to start with a smaller number of units, a two-family house offers a good entry point with lower management effort and lower requirements for fire and sound protection.
For further reading: the construction process including the return logic is explained in the guide Building a multi-family house, the question of price in prefab construction is put into context by the guide on the multi-family house as a prefab and suitable apartment layouts are shown in the gallery with multi-family house floor plans. The path from completion to first letting is described in the guide Building and letting a multi-family house.
Several dwelling units – one transparent fixed price
A multi-family house is a large undertaking that demands a robust calculation. Request fixed-price offers from suitable prefab manufacturers free of charge and without obligation, and compare services, standards and subsidy eligibility before you invest.
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Compare house prices nowImportant questions briefly explained
The most common price questions around Building an Apartment House – answered concisely by the Prefabricated House editorial team (as of 2026).
