Converting a Garage into Living Space in Erlangen: Permits & Taxes

Creating living space without constructing a new building-the idea of converting an existing garage or double garage into living space is appealing. In Erlangen, where vacant building lots are scarce and the housing market is under extreme pressure, converting a garage is a realistic option. The challenge lies in permitting requirements, building codes, and tax implications.

Why the Permit Requirement Is Inevitable

Anyone converting a garage into living space is, under building law, carrying out a change of use. According to Art. 55(1), Sentence 1 of the Bavarian Building Code (BayBO), changes of use require a permit if the new use alters the public law requirements for the building or the parking space. This is always the case when converting a garage into living space:

• A garage is a “space not intended for human occupancy” within the meaning of the BayBO
• Living space is a “room intended for human occupancy” under Art. 45 BayBO with strictly defined requirements
• These differing sets of requirements make every conversion subject to approval

Important for Erlangen: The Erlangen City Planning Office additionally reviews changes of use for compatibility with the zoning plan. Many residential areas in Erlangen have parking space requirements: A certain number of parking spaces must be available per residential unit. If the garage (as a required parking space) is converted into living space, a deficit arises that must be compensated for by another parking space on the property or by purchasing a parking space quota from the City Planning Office.

The redemption fees for parking spaces in Erlangen range from 8,000 to 18,000 euros per space, depending on the location-a cost factor in the planning budget that should not be underestimated.

Market Data 2026: Costs and Added Value of Garage Conversion in Erlangen

Measure	Cost per m²	Single-car garage area	Total cost	New rental value	Payback period
Simple conversion (office/hobby room)	€400-700/m²	20-25 m²	€8,000-17,500	-	-
Complete conversion to living space (DIN/GEG)	€1,200-2,500/m²	20-25 m²	€24,000-62,500	€1,200-1,600/month	15-35 years
Granny flat (with new bathroom)	€1,500-3,000/sq. ft.	30-40 sq. ft.	€45,000-120,000	€1,500-2,200/month	20-40 years
Parking space buyout (mandatory)	Flat rate/space	1 parking space	€8,000-18,000	-	-
Permit fees + architect	Flat rate	-	€3,000-8,000	-	-

Source: Erlangen Expert Committee, Annual Report 2025; Erlangen City Planning Office Parking Space Redemption Fees 2026; Cost Indicators from the Bavarian Chamber of Architects 2025/2026; IVD Middle Franconia Market Report 2025.

The economic viability of converting a garage depends heavily on the initial conditions. If the garage is already dilapidated and there is no parking space issue, a complete conversion into living space can be economically attractive-especially in Erlangen with its high rental prices. For a 35-m² granny flat with a monthly rent of 1,800 euros, the gross return on 80,000 euros in renovation costs is 27%-meaning the payback period is just under 3 years. However, when factoring in full costs, including the parking space buyout, the payback period can extend to 20 years.

In Practice: The Path to a Building Permit in Erlangen

The approval process for converting a garage into living space in Erlangen follows the standard building permit procedure:

Step 1: Zoning Plan and Parking Space Check. First, you check with the Erlangen City Planning Office (Geiselgasteig 2) to determine which parking space requirements apply and whether there are any restrictions on changes of use in the zoning plan. This step is free of charge and quickly provides clarity.

Step 2: Structural and Building Analysis. A structural engineer checks whether the existing garage meets the structural requirements for residential use (floor loads, ceiling, roof). Old garage floors often lack insulation and must be completely replaced-a significant cost factor.

Step 3: Building application submitted by a licensed architect. The plans submitted must be prepared by a licensed architect. For a garage conversion, in addition to floor plans and sections, proof of natural lighting (window openings), sound insulation, fire protection, and GEG compliance are required.

Step 4: Building permit and construction. The processing time at the Erlangen City Building Authority for simple changes of use is typically 6 to 10 weeks.

Step 5: Notice of Completion and, if applicable, Final Inspection. Upon completion, a notice of completion must be submitted to the building authority. For changes of use involving the creation of living space, a final inspection or at least a certificate of GEG compliance is often required.

Step 6: Adjust building insurance and property tax. After completion, the residential building insurance must be adjusted (more living space = higher insured value). Additionally, a change notification must be submitted to the tax office, as the new residential use affects the property tax assessment.

Structural requirements in detail. According to Art. 45 BayBO, living spaces must have a clear ceiling height of at least 2.40 m. However, many garages have only 2.20 to 2.30 m of clear height under the garage door-which means the floor structure (screed, insulation, underfloor heating) takes up valuable headroom. The actual height of the garage should be measured before planning. If the height is too low, lowering the floor (lowering the subfloor) may be necessary, which significantly increases the cost of the conversion.

Lighting requirements are also critical: living spaces require window area of at least one-eighth of the floor area. For a 25-m² garage, this means at least 3.1 m² of window area. Since garage fronts are often occupied by a garage door, it must be determined how this window area can be achieved-side windows, skylights in the roof, or a new wall window at the rear (facing the garden) are typical solutions, but each requires its own structural and waterproofing considerations.

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Local Context: Erlangen and Creating Living Space in Existing Buildings

Erlangen faces a challenge familiar to many university and technology cities: strong population growth, scarce building land, and a steady influx of residents due to Siemens Healthineers and Friedrich-Alexander University. The city has recognized that new living space must increasingly be created within the existing housing stock-through loft conversions, additions, or the conversion of garages.

In the residential areas of downtown Erlangen, around the Schlossgarten, and in the Bruck and Büchenbach neighborhoods, there are many older single-family homes with integrated or attached garages dating from the 1960s to the 1980s. These garages are no longer necessarily used for car parking, as many households have switched to public transportation or bicycles-especially in Erlangen, which has one of the highest bicycle usage rates in Germany.

Experience shows that the Erlangen City Planning Office takes a pragmatic approach to garage conversion requests, provided the basic building code requirements can be met. The option to purchase a parking space allowance offers owners a solution if no replacement parking space is possible on the property.

For owners who wish to rent out their converted garage, eligibility for housing subsidies is also relevant: In Bavaria, small apartments (under 50 m²) can be subsidized for affordable rents through the BayernLabo programs. A subsidy application to the Erlangen Housing Authority can determine whether the planned granny flat qualifies for funding-with more favorable terms than in the privately financed housing market, but subject to occupancy restrictions.

The tax treatment of garage conversion costs depends on the type of use: For rental use, the construction costs must be depreciated via the depreciation allowance (AfA); for partial owner-occupied use, a breakdown must be made according to the ratio of usable floor area. Energy-efficiency renovation measures (insulation, windows, heating) on the owner-occupied portion are deductible at 20% over three years under Section 35c of the German Income Tax Act (EStG). Precise tax advice from a tax advisor is essential for this project, as the distinction between construction and maintenance expenses is complex, and incorrect classifications can lead to additional tax payments.

According to the Erlangen Expert Committee (2025 Annual Report), a legally converted, high-quality garage converted into living space increases the value of a property in Erlangen by 10 to 20 percent-relative to the total property value. This is a significant increase in value that justifies the conversion costs in attractive locations over the long term.

Conclusion for Property Owners in Erlangen

Converting a garage into living space in Erlangen requires a permit and involves significant construction work-but it is financially worthwhile if the Erlangen rental market is leveraged effectively. Those who know the steps involved (checking the zoning plan, clarifying parking space requirements, submitting a building application through an architect) can avoid unpleasant surprises and create lasting added value.

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Parking Space Certification and Buyout: The Often-Underestimated Hurdle

Erlangen has a parking space ordinance that mandates a specific number of parking spaces per residential unit. If the existing garage served as the building’s only parking space, the conversion may eliminate this space-which must be offset by a parking space buyout payment.

The amount of the parking space compensation fee in Erlangen is based on the currently valid parking space ordinance. Depending on the city area and zone, it ranges between 7,000 and 15,000 euros per parking space eliminated. This is a significant cost item that must be taken into account in the profitability analysis of the garage conversion.

Alternative: If a new parking space (e.g., a paved outdoor space) can be demonstrated on the property or in the immediate vicinity, the fee is waived. This is the more economical solution for sufficiently large properties. The Erlangen City Planning Office provides guidance on the specific requirements in each district.

Anyone who does not resolve the parking space issue before submitting the building application risks having the building permit granted only upon payment of the fee-or having the building application rejected. Early consultation with the Erlangen City Planning Office saves time and money.

Structural Requirements for Garages Converted into Living Space

For a converted garage to be recognized as living space, it must meet certain minimum technical requirements. These apply regardless of building code approval and affect comfort, health, and market value.

Ceiling Height: According to BayBO, living spaces must have a clear ceiling height of at least 2.40 m. Single-car garages often have a ceiling height of only 2.20-2.30 m. This makes it necessary to lower the floor or raise the roof-both of which are costly.

Lighting: Living spaces must receive sufficient natural light. Replacing the garage door opening with a window is permitted under building codes, but the window area must meet the minimum requirement (typically 1/8 of the floor area). Courtyard garages without direct exterior lighting are more problematic for residential use.

Thermal insulation: As a non-residential space, a garage is typically uninsulated. For residential use, the building section must be brought up to GEG standards: insulate the floor slab, insulate the exterior walls, insulate the new roof or ceiling, and install windows with thermal insulation glass. Energy costs for a typical single-family garage can range from 15,000 to 30,000 euros.

Heating and Ventilation: Living spaces require heating. The connection to the building’s existing heating system must be hydraulically tested. In Erlangen, where most residential buildings are connected to the district heating network, connecting a garage to the district heating network is technically possible but requires approval from N-Ergie or the respective network operator.

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Compiled by the my-home.de editorial team in collaboration with regional real estate analysts. Data current as of May/June 2026.