Collection · When the building is not Passivhaus and never will be
MVHR in a 3-bed retrofit
Primary question · Is full MVHR really worth it in a normal British 3-bed, or am I overspecifying for the fabric I have?
MVHR delivers its headline numbers in airtight new builds. In a typical British 3-bed, the honest expectation is comfort, quiet, drier walls and predictable air changes, rather than the textbook efficiency figure. That is still usually worth the install.
The pragmatic mid-range pick for a real UK retrofit.
What the ducting, the unit and the commissioning actually cost in 2026.
The honest decision framework for retrofits.
House Summary
If you only do one thing from this collection, do the first one. The rest compound; each step makes the next cheaper, easier or smaller.
Related decisions
Next Step