Homeowner
Victorian Terrace: Boiler & Internal Wall Insulation, Sheffield
Victorian mid-terrace, solid walls
Case study
4-Bed Detached Home:Full Retrofit, Surrey
Detached, 1970s in Surrey
- Property
- Detached, 1970s
- Sector
- Homeowner
- Location
- Surrey
The brief
The challenge
High bills, uneven temperatures, and an ageing heating system that struggled in winter peaks. The homeowners wanted a single coordinated plan rather than piecemeal upgrades. They'd seen a neighbour end up with a heat pump that didn't work well because the insulation wasn't sorted first.
Our approach
How we did it.
We completed a full whole-house assessment aligned to PAS 2035. Cavity wall and loft insulation were sequenced first to reduce heat loss, then a correctly sized air source heat pump was specified. Solar PV with battery storage was added to optimise self-consumption during daytime hours.
The results
What changed.
EPC improved from E (44) to B (89). Annual energy cost reduced by £1,240. The installation was completed in three days of on-site work, spread across two weeks to fit the family's schedule. All documentation lodged with TrustMark within 48 hours of completion.
£1,240
Annual saving
E → B
EPC improvement
4.2t / yr
CO₂ reduction
We budgeted for disruption and got almost none. Three days of actual work, spread across two weeks to fit our schedule. The house is warmer than it's ever been and the energy bills for the first winter were genuinely shocking, in a good way.
More evidence
Related case studies
Read the case study
Social Housing
Council Housing Programme: 60 Properties, West Midlands
Mixed: 1960s council flats and terraces
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