Passive House 2026: Surcharge, Costs & Funding Programmes at a Glance
The passive house sets the highest voluntary energy standard in 2026 – and is correspondingly more expensive to build. This guide quantifies the surcharge over the GEG minimum standard, explains the Passive House Institute's requirements for heating demand and airtightness and shows which funding programmes dampen the extra costs.
The passive house (Passivhaus) is a building concept whose envelope is insulated so effectively that a conventional heating system becomes unnecessary. The warmth generated by the sun, by occupants and appliances, and by ventilation with heat recovery is enough to keep the heating demand below the 15 kWh/m²a mark. Anyone comparing passive-house prices in 2026 will find plenty of choice: timber-frame and timber-panel construction have long achieved the required U-values at reasonable wall thicknesses – so the premium over a standard house stays manageable and pays for itself through low heating costs. Our prefab house overview is a solid place to start on the topic.
How the passive house, the GEG and the efficiency-house tiers fit together
Short answer: For new builds, the Building Energy Act (Gebäudeenergiegesetz, GEG) requires at least the EH 55 standard in 2026 and sets upper limits for primary energy demand, transmission heat losses and the mandatory share of renewable heat. A passive house comfortably exceeds these requirements and, in the KfW classification, usually corresponds to an Efficiency House 40 or better – which puts the highest KfW funding tier within reach. Our GEG guide 2026 explains how the tiers build on one another in detail.
The four load-bearing pillars of a passive house
- An insulated envelope with U-values of no more than 0.15 W/(m²K) for the external wall, roof and floor slab.
- Triple-glazed windows (Uw ≤ 0.80 W/(m²K)) fitted in thermally broken frames.
- A ventilation unit with heat recovery, summer bypass and frost protection, with an efficiency of at least 85%.
- An airtight construction, verified before handover by a blower-door test at n₅₀ ≤ 0.6 1/h.
Planning and the right energy expert
A passive house calls for building-physics expertise down to the last detail: every thermal bridge must be avoided, all ventilation ducts routed inside the insulated envelope, and summer heat protection factored in from the outset. The energy calculation is carried out by a qualified specialist from the federal list of energy-efficiency experts. Without a person listed there you cannot submit a KfW application; for passive-house projects these specialists usually also provide the PHPP calculation from the Passive House Institute. With our calculator you can work out prefab-house costs and run through different fit-out options individually.
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