Working file M2
Retrofit ventilation cost (UK 2026)
Ventilation stratum cost in 2026: MVHR, PIV, dMEV. PAS 2035 requires a ventilation review after fabric tightening.
Tightened fabric without a ventilation strategy causes condensation, mould and Indoor Air Quality complaints inside two heating seasons. PAS 2035 requires a ventilation review after any meaningful fabric measure; this stratum is a precondition, not an optional extra.
Surveyed 1 October 2026. Ofgem cap for 1 October to 31 December 2026 applied (gas 7.97p, elec 26.32p, gas standing 29.68p, elec standing 54.83p). Next scheduled review 25 November 2026 (January cap announcement). [ref M2]
By Oliver Wakefield-Smith, Founder, Digital Signet. Corrections to oliver at digitalsignet dot com.