Custom-built home

Semi-finished home - A semi-finished home is a new construction that the builder delivers only up to a certain stage of completion, with the homeowner undertaking all or part of the interior finishing work themselves. This so-called “labor-saving” approach can save 15 to 30 percent of the total construction costs, depending on the level of completion. Compared to a turnkey home, a shell home requires more initiative, craftsmanship, and flexibility in terms of time.

Construction Stages and Scope of Work

The term “shell home” is not standardized-each manufacturer defines the scope of delivery differently. In practice, however, three common construction stages have become established:

Kit house: The manufacturer supplies the materials and construction plans; the homeowner handles the entire construction, including the shell. This option requires considerable manual skill and is rarely chosen.

Ready for finishing (technical work complete): The most common option. The manufacturer erects the building envelope, including the roof, windows, front door, and exterior plaster. The building services-i.e., electrical wiring, plumbing, and heating-are already installed. The homeowner handles the complete interior finishing: subfloor, drywall, tiling, flooring, painting, and installation of interior doors and fixtures.

Finished home with extended scope of work: Here, the subfloor and interior plaster are also already completed. The homeowner is only responsible for flooring, painting, tiling, and the installation of plumbing fixtures and interior doors.

Cost Comparison: Shell House vs. Turnkey

A practical calculation example for a single-family home with 140 m² of living space in the Nuremberg metropolitan area (excluding land):

Item	Turnkey	Technically complete shell house
Manufacturer’s price	€350,000	€240,000
Material costs for self-construction	-	€35,000
Contractor costs for individual trades	-	€15,000
Value of owner’s labor (credited)	-	€45,000
Total cost	€350,000	€290,000
Savings	-	approx. €60,000

The actual savings depend on your own DIY skills, the time available, and market prices for materials. It is crucial to carefully review the construction and service specifications. We recommend clarifying each item in writing with the manufacturer to avoid future disputes regarding the scope of work.

Opportunities and Risks of Doing the Work Yourself

The “muscle mortgage”-that is, the financial value of your own labor-is generally recognized by banks as a substitute for equity up to an amount of €30,000 to €50,000. This improves financing terms and reduces the monthly payment.

However, doing the work yourself also carries risks:

• Quality risk: Craftsmanship errors during interior finishing can lead to moisture damage, mold growth, or inadequate impact sound insulation
• Time risk: Many homeowners underestimate the time required-experience shows that a DIY shell house requires six to twelve months of additional construction time compared to the turnkey option
• Warranty risk: Warranty claims apply only to the scope of work performed by the manufacturer, not to the work done by the homeowner
• Coordination effort: The homeowner must coordinate material deliveries, tradespeople, and their own work schedules
• Financing risk: If the finishing work takes longer than planned, extended financing costs (commitment fees) will arise

Legal Framework and Contract Drafting

The purchase contract for a shell house is subject to the MaBV (Real Estate Broker and Developer Ordinance) if the seller acts as a developer. Payment is made in installments based on construction progress, not in advance. A maximum of 13 installments is permitted, with the amount capped according to the degree of completion.

Important: The construction and service specifications are the central contractual document. They define which services are included in the purchase price and which the buyer must provide themselves. Any ambiguities in the specifications are to the detriment of the user (manufacturer), provided they use standard terms and conditions-nevertheless, we recommend having a lawyer review the contract before signing.

Practical Tip for Nuremberg and Franconia

In the Nuremberg metropolitan region, several regional and national prefabricated home providers offer semi-finished homes. Anyone planning a semi-finished home in Nuremberg, Fürth, or Erlangen should first clarify the property issue-because in many new development areas around Nuremberg, zoning plans prescribe specific roof shapes, story heights, or facade designs that limit design flexibility.

We recommend realistically assessing the scope of your planned DIY work and, if necessary, contracting out specific trades-such as electrical installation or plumbing connections-to local specialized contractors. Especially in Franconia, personal contacts with tradespeople from the Nuremberg Chamber of Industry and Commerce (IHK) region often allow for favorable terms to be negotiated for specific finishing work. Clarify your planned DIY work with the financing institution early on to ensure it is recognized as equity.

Frequently Asked Questions

How much can I really save with a shell home?

The actual savings depend on the chosen level of completion and the extent of the work you do yourself. For a technically complete shell house, we estimate savings of 15 to 25 percent compared to the turnkey option. For a house with 140 square meters of living space in the Nuremberg region, this amounts to approximately 40,000 to 70,000 euros. However, material costs for interior finishing (typically 25,000-40,000 euros) and the costs for individual specialized trades must be factored in, so that the net savings in practice amount to 30,000 to 50,000 euros. Time spent and potential costs from mistakes are not yet included in this calculation.

Does the bank recognize personal contributions as equity?

Yes, most banks recognize the “muscle mortgage” as a substitute for equity-typically up to an amount of 30,000 to 50,000 euros. A prerequisite is a clear, written breakdown of the planned personal contributions, including realistic hourly rates (typically 15-20 euros/hour for general labor, 30-50 euros/hour for skilled labor) and material costs. We recommend coordinating your own labor contributions with the financing bank in advance, as the amount recognized varies by institution. Some banks require, as proof, a confirmation from the contractor regarding the standard trade rate for the work performed.

Which types of own labor are most worthwhile?

Homeowners achieve the greatest cost savings on tasks that are labor-intensive but technically manageable: painting, wallpapering, installing laminate and vinyl flooring, and simple drywall work can be done well without professional training. Tiling in the bathroom and installing interior doors are more demanding, but feasible with practice and good preparation. We strongly advise against doing electrical installations, gas connections, and waterproofing work yourself-these tasks require specialized knowledge and must, in some cases, be inspected and approved by licensed contractors. Mistakes here can not only be expensive but also pose safety risks.

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