Modern Methods of Construction — panelised timber-frame, volumetric modular, hybrid steel-frame — has been waiting for the right regulatory moment. The Future Homes Standard may be it.
Why MMC suits FHS
FHS demands tighter fabric performance (0.15 wall U-value, 3 m³/h·m² air permeability) and more integrated services (PV, ASHP, MVHR). All of these are easier to deliver under factory conditions than on a wet, windy site. Panelised timber-frame walls hit the new U-value targets with 200–250 mm I-joist build-ups; factory-installed MVHR ductwork avoids the air leakage that plagues site-installed systems.
Factory pre-fit of in-roof solar
Some panelised roof systems allow in-roof solar to be pre-fitted to roof cassettes off-site. For MMC volumetric builders the logic goes further: panels, roof covering and weatherproofing can all be completed and checked in the factory, leaving the final electrical connection for site.
Air permeability advantage
Factory-built modules routinely test at 1.5–2.5 m³/(h·m²) — well below the FHS 3 target. Site-built homes need a deliberate sealing strategy and an air-tightness specialist; MMC delivers the same result without the on-site complexity.
The MMC supply-chain question
MMC supply has historically been the bottleneck — UK factory capacity is around 25,000 dwellings/year against a need of ~150,000. FHS may finally pull the volume forward. Top 10 housebuilders increasing MMC mix to 25%+ is the strategy several major brands have signalled for 2026–28.
