Note: This calculator is optimized for the German construction market and legal framework (e.g., DIN standards, German tax laws).

Prefabricated House Calculator

Estimate the true cost of building your dream home, including land, taxes, and hidden side costs.

Land
Land Costs: (Land) (Tax) (Notary)
Foundation
Note: Additional costs for supports (Stützen) should be considered for floor slabs on sloping terrains.
Advantage: Sloping terrain can significantly reduce earth disposal costs for a basement.
Foundation Costs: (Earthworks)
Prefabricated House
Costs for upgrades on tiles, sanitary objects, doors, or electrical installations exceeding the standard.
Reduces tax if land and house are separate contracts.
Risk buffer for self-organized trades
Finishing & Included Trades
Trade / Item Included in House Price? Estimated Cost (€) Buffer (%)
House Construction Costs: (Structure)
Construction Side Costs
Costs for the examination by the building authority.
Owner's liability, construction insurance
Temporary electricity, water, etc.
Water, sewer, power, telecom connections
Lageplan, Grob- und Feinabsteckung, Gebäudeeinmessung
Often separately payable expert reports.
Approval fees by authorities.
Health and safety coordinator on the construction site.
Independent expert for site inspections and quality control.
Electricity costs for heating the screed via heat pump or mobile units.
Costs for transport and temporary storage of furniture.
Double burden of rent and loan interest.
Costs for individual architectural design and planning.
Unforeseen admin expenses
Additional Side Costs: (Permit Fees)
Outdoor Facilities
Can cost €20,000 to €30,000 alone.
Paving work around the house.
Paving or graveling.
Fences, hedges, or walls.
Gravel strip around the house to protect the facade.
Planting, lawn, and soil work for the garden.
Outdoor Facilities Costs: (Garage)

Total Investment

€0

Land Total
Property Transfer Tax
Foundation Total
House & Finishing
Side Costs (Permits/Insurance)
Outdoor Facilities
Strategic Tax Advantage

In Germany, you can save property transfer tax (Grunderwerbsteuer) by separating the land purchase from the house construction contract.

Scenario A: Tied Transaction
(Land + House)
Scenario B: Separate Purchase
(Land only)
Potential Savings
How to achieve this?
  • Buy the land from a party unrelated to the house builder.
  • Wait at least 6 months between land purchase and house contract.
  • Do not use a combined 'Land + House' offer from a single developer.
Disclaimer: Tax laws are complex. Consult a tax advisor regarding 'tied transactions' (Koppelungsgeschäft).

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Frequently Asked Questions

The most common hidden costs are ancillary construction costs (Baunebenkosten) like earthworks, utility connections, and permit fees. Additionally, many people underestimate the cost of the foundation (slab or basement) and outdoor facilities like driveways and fencing.

A floor slab is significantly cheaper (saving €30k-€60k), but a basement provides valuable storage and technical space, and can increase the resale value. Our calculator helps you visualize this price difference specifically for your house size.

While the house structure can be erected in just 2-3 days, the entire process from initial planning and permits to the final finishing usually takes between 12 and 18 months.

Usually, the price for a house shell (Ausbauhaus) includes the walls, roof, and windows. You are responsible for the interior finishing (flooring, painting, tiling). A 'turnkey' (schlüsselfertig) house is more expensive but includes most of this work.

For a new house, a decent kitchen usually costs between 10,000€ and 25,000€. We recommend budgeting an additional 10%% of the house price for initial furniture and lighting.

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Verified Tool Facts & Data Sources
Uses current construction cost benchmarks.
Includes German DIN and tax standards.
Factors in hidden ancillary side costs.
Privacy-first: No data leaves your browser.
Machine-readable facts available at /facts.json

Detailed Methodology & Calculation Logic

Investment Calculation Logic

The calculator uses a modular cost-aggregation model to determine the total required capital for a building project.

  • Land Side Costs: Includes purchase price plus state-specific property transfer tax, notary fees (fixed 2%), and realtor commissions.
  • Trade-Specific Buffer: Individual risk buffers can be applied to each finishing trade to account for market price volatility.
Strategic Tax Analysis

A key feature is the comparison between 'Separate Purchase' and 'Tied Transaction' (Bauherrenmodell) tax strategies.

  • Tax Savings: Identifies potential savings by paying property tax only on the land versus paying it on the combined value of land and the house structure.
  • Foundation Savings: Automatically adjusts excavation costs if a basement is chosen on a sloped plot (assuming approx. 25% disposal offset).
Last updated: 2026-03-26