What a pas 2035 retrofit assessment covers
A PAS 2035 retrofit assessment is the regulated, structured assessment required for whole-home retrofit work funded under ECO4 and aligned schemes. It combines an EPC, a building condition survey, an occupancy assessment, and a detailed plan for a fabric-first sequence of measures. The assessment is delivered by a TrustMark-registered Retrofit Assessor, with sign-off by a Retrofit Coordinator.
- Full RdSAP-aligned EPC survey
- Building condition survey (defects, ventilation, moisture)
- Occupancy assessment (heating use, vulnerability, special needs)
- Heritage and conservation considerations where applicable
- Risk assessment per PAS 2035 Annex C
- Retrofit-design proposal sequence
- Lodged retrofit assessment record
Typical findings
- Properties needing ventilation upgrades alongside insulation work
- Solid-wall homes needing internal vs external decision based on heritage / disruption / cost
- Heat-pump suitability conditional on emitter upgrade and fabric-first work
- Hard-to-treat cavities or cavity-fill quality issues
- Properties unsuitable for measures within current grant funding
Typical cost: £550-£900 typical PAS 2035 retrofit assessment, £900-£1,500 with retrofit-coordinator sign-off, often grant-funded under ECO4
When to book: Before commissioning any whole-home or multi-measure retrofit, especially where ECO4, HUG, or LA Flex funding is sought; also as a paid-for private-pay assessment when planning a major renovation.
Required qualifications for assessor: TrustMark-registered Retrofit Assessor (Level 3 Retrofit Assessor qualification through City & Guilds, ABBE, or equivalent), with Retrofit Coordinator (Level 5) sign-off