Bromley Cavity Wall & Loft Insulation Home Upgrade
A Bromley family in a detached home reduced heat loss and transformed cold rooms into a consistently warmer, more comfortable space with a targeted package of cavity wall and loft insulation. The upgrade cuts heat loss through the roof and external walls, helping to reduce heating demand by an estimated 25–30% and improving everyday comfort across all six heated rooms.
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Financial Impact
Building Performance
- Property Type Detached house, 6 heated rooms
-
Pre-Upgrade Loft Insulation
100 mm mineral wool
(insufficient) - Post-Upgrade Loft Depth 300 mm total insulation
- Main Heat Loss Routes Treated Loft and cavity external walls
Environmental Impact
- Estimated Annual CO₂ Savings ~500–700 kg
- Estimated Lifetime CO₂ Reduction 10,000+ kg
- Material Used Mineral wool loft roll & cavity fill
- Insulation Benefits Less heat loss, lower demand, more stable temperatures
The Project
Customer Background
A homeowner in the BR6 Bromley area was experiencing cold upstairs rooms, high heating bills and noticeable draughts during winter evenings. The family wanted a long-term solution that would make the whole house feel warmer without constantly turning the heating up.
Project Goals
- Cut unwanted heat loss through the loft and external walls
- Improve comfort in bedrooms and living spaces all year round
- Create a more efficient building fabric before considering other upgrades
- Work with a trusted installer offering clear advice and tidy workmanship
Location Details
- Location: Bromley (BR6)
- Property Type: Detached house, two storeys, six heated habitable rooms
- Construction Era: Main house built 1950–1966 with later extension
- Pre-Upgrade Rating: EPC band D with clear potential to improve
- Main Issues: Insufficient loft insulation thickness and uninsulated cavities
The Solution
Simple Green Energy designed a fabric-first home upgrade focused on cavity wall insulation and a full loft insulation top-up to modern standards, reducing heat loss and stabilising indoor temperatures throughout the property.
| Cavity Wall Insulation | Cavity walls drilled and filled with high-performance mineral fibre insulation to reduce conductive heat loss through external walls, helping rooms feel warmer for longer. |
|---|---|
| Loft Insulation Upgrade | Pre-existing 100 mm loft insulation retained and carefully topped up with additional layers to reach approximately 300 mm, in line with current best-practice standards. |
| Installation Approach | Loft cleared and checked for damp, insulation laid between joists with a further layer laid perpendicular to avoid compression and cold gaps, ensuring even coverage and maintained ventilation. |
| Materials | Non-combustible mineral wool products selected for strong thermal performance, ease of handling and improved comfort, supporting a more sustainable, energy-efficient home. |
How it works together: The cavity wall insulation slows down heat escaping through the external walls, while the upgraded loft insulation prevents warm air from rising and escaping through the roof – meaning the heating system does not need to work as hard to keep the whole home comfortable.
Bill Comparison
*Estimates based on a typical detached BR6 property with six heated rooms and standard UK heating patterns. Actual savings may vary depending on usage, tariffs and future energy prices.
“We are really happy with the insulation. The team took time to evaluate the property first, explained everything clearly and left the house clean and tidy once the work was finished. The difference in warmth has been noticeable, especially in the evenings.
Interested in an Insulation Upgrade in Bromley?
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