Real installs · measured outcomes · funded routes
Every case study shows the property, the problem, what we installed, what it cost, what grants covered, and what the homeowner saves each year. No vague claims. Just the receipts.
Serving the United Kingdom
1960s dormer · drafty upstairs bedrooms · GBIS-funded retrofit (scheme has since closed)
Cavity walls plus between/over-rafter insulation to the dormer spaces. EPC D → C, £370/yr saved, £420 top-up for the room-in-roof element.
EPC band
+12 points
Gas use
-30%
Annual heating cost
£370/yr saved
Customer contribution
GBIS covered the rest (scheme since closed)
1980s detached · 165m² · gas central heating + ageing combi
Replaced an 18-year-old gas combi with a 9kW ASHP, added 5kW solar PV and a 10kWh battery. EPC C → A, £1,640/yr saved, BUS covered £7,500.
EPC band
+18 points
Annual energy cost
£1,640/yr saved
Heat pump SCOP
Better than modelled
Solar self-consumption
Battery-paired
1898 mid-terrace · 96m² · solid brick · loft conversion in the eaves
Sympathetic IWI on the front rooms, multifoil to the room-in-roof loft conversion. EPC E → C, £1,120/yr saved, ECO4 + LA Flex stacked.
EPC band
+22 points
Annual heating cost
£1,120/yr saved
Loft conversion U-value
8x improvement
Customer contribution
ECO4 + LA Flex stacked
1970s coastal semi · pebbledash render · seafront exposure
BBA-certified ProPERLA exterior coating + cavity wall insulation on a salt-exposed coastal property. EPC D → C, £620/yr saved, condensation eliminated.
EPC band
+13 points
External wall moisture
Back to normal range
Annual heating cost
£620/yr saved
Internal condensation
Health-positive
1990s detached · 172m² · off-gas · oil-fired central heating replaced
£7,500 BUS grant secured, existing radiators retained, heat output validated on a -2°C morning.
EPC band
+12 points
Annual heating cost
£590/yr saved
BUS grant
Fully claimed
Install duration
Oil tank removed day 3
1930s semi · narrow cavity (no CWI possible) · self-funded retrofit
Actis Hybris multifoil between loft rafters plus garage-ceiling application. EPC D → C, £620/yr saved, bedroom-above-garage 4°C warmer.
EPC band
+14 points
Gas use
-39%
Annual heating cost
~£620/yr saved
Install duration
Bedroom 4°C warmer
1950s semi-detached · 112m² · gas central heating
EPC D → B, £892/yr saved, customer contribution £0. Loft + cavity + underfloor + radiator programmers in six working days.
EPC band
+24 points
Annual heating cost
£892/yr saved
Customer contribution
Fully ECO4 funded
Install duration
Family stayed in the home
1970s bungalow · pension-credit household · fully ECO4 funded
Cavity + 300mm loft + 96% A-rated boiler + smart thermostat. EPC E → B (3-band jump), £1,040/yr saved, customer contribution £0.
EPC band
+42 points (3 bands)
Gas use
-55%
Annual heating cost
£1,040/yr saved
Customer contribution
Fully ECO4 funded
Single-storey 1970s bungalow · 88m² · Council Tax band B
100mm → 300mm loft top-up, GBIS grant covered 100% at the time. Install completed in under four hours. (GBIS has since closed to new applications.)
EPC band
+21 points
Annual heating cost
£340/yr saved
Customer contribution
Fully GBIS funded
Install duration
Single-day, in-home
Modern townhouse · 98m² · EPC C → B · gas boiler retained
4.2kW solar array, 10kWh battery, SEG export tariff. Bill down from £1,840 to £312/year in the first 12 months.
EPC band
+12 points
Annual bill
£1,528/yr saved
Grid imports
-78%
SEG export revenue
15p/kWh export
Same process. Same team. Same guarantee. Book a free 45-minute survey and we'll show you the numbers for your home.
The plan is yours to keep. Take it to two other installers if you like.