Comprehensive Energy Retrofit Strategy

Current Condition Assessment

• Windows: 50-year-old double glazing – cold and inefficient
• Radiators: 50 years old
• Gas boiler: 29 years old
• Heating controls (Emerson): non-functional
• Attic: partial insulation only
• Kitchen extension: no wall insulation
• Flat roof (kitchen): no insulation and leaking

Primary Strategic Objective

• Stabilise building fabric (roof + extension)
• Reduce Heat Loss Indicator below 2.0
• Upgrade entire heating system
• Integrate solar PV
• Achieve maximum achievable BER (target A-range)

Priority Actions for Assessor Review

1. Flat Roof & Extension Remediation (Critical)

• Full insulation upgrade to flat roof
• Address leak and thermal bridging
• Insulate kitchen extension walls

2. Whole-House Insulation Strategy

• Upgrade attic to 300mm+
• Assess external wall insulation despite cavity fill
• Improve airtightness and ventilation balance

3. Heating System Replacement

• Confirm HLI reduction required for heat pump
• Replace boiler and radiators if necessary
• Upgrade heating controls

4. Window Replacement

• Replace legacy double glazing
• Target high-performance units (U ≤ 1.2 W/m²K)
• Assess triple glazing feasibility

5. Solar PV Integration

• Determine system size to achieve A rating
• Assess Renewable Energy Ratio uplift

Staged Implementation Roadmap

1. Repair and insulate flat roof & extension
2. Upgrade attic and walls
3. Replace windows
4. Reduce HLI below 2.0
5. Install heat pump system
6. Add solar PV
7. Reassess BER

Expected Outcome

• Major comfort improvement
• Substantial energy bill reduction
• Increased property value
• Future-proofed low-carbon home