Category: Sustainable buildings · Reviewed by Al Jabbar, Broker · Specialist Risks · Last reviewed 2026-06-10
Passive house insurance is property, liability, professional indemnity and latent defects cover arranged for buildings certified to the Passivhaus standard — an energy performance specification developed by the Passivhaus Institut in Darmstadt that limits annual space heating demand to no more than 15 kWh/m² and requires near-airtight construction with mechanical ventilation with heat recovery.
Category: Sustainable buildings Also known as: Passivhaus insurance, low-energy house insurance, PHPP-certified building cover Typical UK market form: property all risks + 10-12 year structural warranty + PI for design team including MVHR designer Related concepts: EnerPHit insurance, Green building insurance, BREEAM-rated building insurance
Passive house insurance refers to the package of covers arranged for buildings designed, modelled and certified to the Passivhaus standard. The certified standard requires annual space heating and cooling demand of no more than 15 kWh/m², primary renewable energy demand of no more than 60 kWh/m², an airtightness result of no more than 0.6 air changes per hour at 50 Pa pressure, and avoidance of summer overheating. Certification is awarded against the Passivhaus Planning Package (PHPP) energy model, validated by an accredited Passivhaus Certifier.
From an insurance standpoint, the key features of a Passivhaus building are the high level of insulation, the triple-glazed and rigorously detailed envelope, the absence of conventional wet heating systems and the presence of a mechanical ventilation with heat recovery (MVHR) unit running continuously. Each of these affects the risk profile — typically reducing fire ignition sources from boilers and flues, but introducing new exposures around MVHR maintenance, condensation risk and overheating.
Passivhaus was developed by the Passivhaus Institut (PHI), Darmstadt, with the first certified building completed in 1991. UK certification is delivered by accredited certifiers operating under BS EN ISO 17025 accreditation and coordinated through the UK Passivhaus Trust. The variants relevant to UK practice are the Classic Passivhaus standard, Plus, Premium, the Low Energy Building (LEB) standard and EnerPHit (for retrofits of existing buildings).
Passivhaus interacts with several other UK frameworks. The RICS Whole Life Carbon Assessment for the Built Environment, 2nd edition (September 2023) is used to evidence embodied carbon performance, since Passivhaus itself addresses operational rather than embodied energy. The LETI Climate Emergency Design Guide explicitly references Passivhaus as one route to its energy use intensity targets. The UK Net Zero Carbon Buildings Standard, Pilot Version 1.0 (September 2024) treats Passivhaus performance as satisfying its operational energy verification requirement. BREEAM and Passivhaus can be pursued in parallel, with Passivhaus delivering most of the BREEAM Ene credits automatically.
Property all-risks rating for Passivhaus buildings is generally favourable. The absence of gas appliances and flues reduces fire ignition frequency, and the controlled MVHR ventilation reduces moisture ingress. Insurers with active Passivhaus appetite in the UK include Aviva, Zurich, Allianz and AXA, with credits of 3-7% typically available on the standard rate. Capacity restrictions appear where the construction system uses CLT, Structurally Insulated Panels (SIPs) or other novel materials, particularly above 18 metres where the Building Safety Act 2022 regime applies.
Latent defects and structural warranty providers — NHBC, LABC Warranty, Premier Guarantee — apply their accepted-systems lists to Passivhaus projects in the same way as conventional construction. NHBC’s “NHBC Accepts” scheme has covered an increasing number of Passivhaus-suitable closed-panel timber frame systems and SIPs since 2020. The MVHR system, ducting and control software fall within most warranty cover but with specific exclusions for commissioning failure — Passivhaus airtightness testing must be done at the right point in the build sequence to be valid.
Professional indemnity for the design team is a particular focus. Passivhaus designers (Certified Passivhaus Designers/CEPHDs), M&E engineers responsible for MVHR sizing and Passivhaus Certifiers all carry distinct PI exposures. Failure to achieve the 0.6 ACH airtightness target can result in re-work claims of considerable size. PI insurers — including Beazley, Travelers, Markel and RSA — require disclosure of Passivhaus targets and increasingly impose specific endorsements addressing certification failure. The Insurer Wider Buildings (IWB) inspection regime focuses on MVHR commissioning records, airtightness test certificates and overheating risk assessments under TM59 (CIBSE).
The Building Safety Act 2022 received Royal Assent on 28 April 2022 and established the Building Safety Regulator within the HSE in October 2023. The Higher-Risk Buildings regime under the Building Safety (Higher-Risk Buildings Procedures) (England) Regulations 2023 (SI 2023/909) applies to residential buildings of at least 18 metres or 7 storeys — a category increasingly common for Passivhaus social housing schemes. Section 135 of the Act extended the Defective Premises Act 1972 limitation period to 30 years retrospective and 15 years prospective.
Approved Document L (2021 edition, operative 15 June 2022) sets a 31% CO2 reduction requirement that Passivhaus exceeds by a wide margin. Approved Document F (ventilation, 2021) interacts directly with MVHR specification. Approved Document O (overheating, 2021) is highly relevant — Passivhaus buildings must be designed to avoid summer overheating, and overheating-related claims have begun to appear in PI files since 2023. The Future Homes Standard consultation closed in March 2024 with implementation expected in 2025; many forecast it will move UK new-build housing close to Passivhaus performance.
Developers of Passivhaus schemes should obtain warranty cover at the earliest design stage so that the warranty provider can review the construction system before site mobilisation. Brokers will require the PHPP modelling outputs at quote stage. Asset owners should diarise MVHR filter changes (typically six-monthly) and biennial commissioning, since neglected MVHR systems both compromise the Passivhaus performance and create indoor air quality liabilities under landlord duties.
Housing associations and registered providers building social Passivhaus schemes should be aware that some standard form contract appendices will need bespoke drafting around airtightness liability — the standard JCT defects liability provisions do not cleanly map to Passivhaus performance metrics.
A Welsh housing association builds a 64-unit Passivhaus social housing scheme in Cardiff in 2025 using a CLT panel system from a UK manufacturer on the NHBC Accepts list. The design team carries £10m PI with a specific endorsement covering Passivhaus certification failure up to £2m aggregate. NHBC issues Buildmark warranties on each unit with a 12-year period, conditional on annual MVHR servicing recorded on a digital log accessible to NHBC. Property all risks insurance is arranged on the completed estate at a 5% credit to the standard timber-frame rate, with overheating monitoring (CIBSE TM59) required for the first three summers.
This entry is part of the Apex Insurance Wiki. Last reviewed by Matt Bartlett on 2026-06-10. Next review: 2026-12-10.
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