Important Notice
Every older property is unique. This guide covers general considerations, but your home needs a professional survey by an MCS-certified installer who understands retrofit work. We are not heating engineers or surveyors.
Common Challenges in Older Properties
Solid Walls
Pre-1920s homes typically have solid walls without cavity for insulation. Heat loss through uninsulated solid walls is significant.
- • Internal wall insulation (loses some room space)
- • External wall insulation (changes exterior appearance)
- • Often grant-funded through ECO4
Draughty Construction
Older homes often have gaps around windows, doors, floorboards, and chimneys that allow significant heat loss.
- • Draught proofing (relatively low cost)
- • Chimney balloons or caps
- • Secondary glazing for period windows
Undersized Radiators
Heat pumps operate at lower flow temperatures (35-45°C vs 60-80°C). Existing radiators may be too small to heat rooms adequately at lower temperatures.
- • Larger radiators in key rooms
- • Underfloor heating where possible
- • Fan convectors for problem rooms
Listed Buildings
Listed buildings face restrictions on external changes. External wall insulation and visible heat pump units may need planning permission or listed building consent.
- • Internal insulation (usually permitted)
- • Carefully positioned outdoor unit
- • Consult conservation officer early
Heat Pump Suitability by Property Era
Victorian & Georgian
Solid walls, single glazing, minimal insulation. Highest heat loss but also highest grant potential. Likely needs comprehensive insulation programme before heat pump installation.
Edwardian & Inter-War
Mix of solid and early cavity walls. Often good room sizes with space for larger radiators. Loft insulation and draught proofing usually the first priorities.
1930s-1960s
Many have unfilled cavity walls — cavity wall insulation is a quick, cheap improvement. Often already have loft insulation. Generally good candidates for heat pumps with modest preparation.
1970s-1990s
Cavity walls (some already insulated), double glazing common. Building regulations improved insulation. These properties are often well-suited to heat pumps with minimal preparation.
Check Your Grant Eligibility
Older properties with lower EPC ratings often qualify for the most generous grants — insulation and heat pump funding combined
Key Eligibility Factors:
- Low-income household
- Property EPC rating D-G
- Owner-occupier or private tenant
Get comprehensive property analysis with grant recommendations, savings estimates, and installer connections.
Full Property AnalysisThe Retrofit Process
EPC Assessment
Get your current rating and identify priority improvements. This determines grant eligibility.
Insulate First
Insulation before heat pump. ECO4 can fund loft, cavity, and solid wall insulation for eligible homes.
Heat Pump Survey
MCS installer assesses the improved property and recommends the right size and type of system.
Install & Grant
Installer applies for the £7,500 BUS grant and installs the system in your prepared home.
Get Expert Advice for Your Older Home
Connect with MCS-certified installers experienced in retrofit installations for older properties.
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Related Guides
Solid Wall Insulation
Essential for older solid-wall homes. Internal and external options explained.
Read guide →Heat Pump Costs 2026
Full cost breakdown including additional costs for older properties.
Read guide →ECO4 Grant Guide
Free insulation for eligible households — often the first step in a retrofit.
Read guide →Your Older Home Deserves Modern Heating
Government grants can fund both the preparation and the heat pump. Find out what your home qualifies for.