A demonstration of what is possible in what was a very cold/draughty yet reasonably modern house compared to more prevalent victorian stock in area.
A 1961 small 3 bed linked detached. Quiet suburban crescent near Longford Park. 2 people living.
Foot print of approx 42 square metres.
See video: Gervase Mangwana - planning and executing a whole house retrofit
- Fully decanted retrofit.
- Budget of around £65,000.
- Self-build project. Designed and project managed by myself using friends in trades and other trades already known.
- Aimed for high levels of insulation and airtightness without specifically aiming for a recognised standard.
- Mix of pragmatism given the type of dwelling (non traditional so UPVC windows). Also mix of sustainable and modern materials (e.g. wood fibre external/lime render and petrochemical internal insulation).
- Also a blend of cheap fittings and re use of some of original materials (staircase lived in garden for 3 months) along with splashing out on reclaimed parquet flooring and ash window boards sourced from Treestation. Some minor remodelling of house to add utility/drying room and downstairs toilet.
- Wall U-values < 0.2 W/m2/k
- Roof < 0.1
- Floor < 0.12
- Triple glazing downstairs, reglazed existing upstairs.
- Airtest 0.75 ACH
- Existing 3.3 kW PV array to be diverted to cylinder when not used elsewhere. Lifetime FIT "profits" to pay for approx half of retrofit.
- Non condensing combi replaced with small system boiler.
- Underfloor heating installed downstairs.