Solid Wall Insulation Cost
Essential upgrade for older homes with solid walls
Average Cost per m²
Energy Rating
Annual Savings
Payback Period
About Solid Wall Insulation
Insulation added to solid walls (pre-1930s properties) either internally or externally. More complex but essential for older properties without cavity walls.
R-Value Range
R-3.0 to R-5.5
Typical Lifespan
30+ years
Installation Complexity
Professional
Energy Rating
B
Maintenance Level
Low
Cost Category
Premium
Advantages & Considerations
Advantages
- Major energy savings potential
- Suitable for period properties
- Can improve appearance (external)
- Addresses thermal bridging
Considerations
- High cost
- Disruption during installation
- Planning permission may be needed
- Reduces room size (internal)
Best Suited For
Pre-1930s properties
Solid brick/stone walls
Properties with high energy bills
Conservation areas (with restrictions)
Solid Wall Insulation Cost Breakdown
The table below shows typical costs for Solid Wall Insulation including materials and installation. Prices vary based on area size, material choice, and property accessibility.
| Area Size | Materials | Installation | Total Cost | Annual Savings |
|---|---|---|---|---|
| Small (20m²) | £1,300 | £1,700 | £3,000 | £360 |
| Medium (40m²) | £2,600 | £3,400 | £6,000 | £720 |
| Large (80m²) | £5,200 | £6,800 | £12,000 | £1,440 |
| Extra Large (120m²) | £7,800 | £10,200 | £18,000 | £2,160 |
Cost Factors
Factors that increase cost:
- Difficult access areas (+20-40%)
- Premium materials (+15-30%)
- Additional preparation work (+10-25%)
- Weekend or urgent installation (+15-20%)
Ways to save on cost:
- Larger areas reduce cost per m² (10-15%)
- Off-peak season installation
- Combining multiple insulation types
- Getting multiple installer quotes
Material Options for Solid Wall Insulation
Different materials offer varying performance characteristics for Solid Wall Insulation. Choose based on your budget, performance requirements, and environmental preferences.
Highly Recommended Materials
Expanded Polystyrene (EPS)
Highly Recommended
Performance
R-Value: R-4.5 to R-5.5
Rating: 9.2/5
Properties
Fire Rating: Fair (Combustible)
Moisture: Excellent
Environmental
Eco Rating: Fair
Sound: Fair
Installation Notes:
External wall insulation systems
Phenolic Foam
Highly Recommended
Performance
R-Value: R-6.0 to R-7.0
Rating: 9.0/5
Properties
Fire Rating: Excellent (Self-extinguishing)
Moisture: Good
Environmental
Eco Rating: Fair
Sound: Fair
Installation Notes:
Thin but high performance
Recommended Materials
Mineral Wool
Recommended
Performance
R-Value: R-4.0 to R-5.0
Rating: 8.5/5
Properties
Fire Rating: Excellent (Non-combustible)
Moisture: Good
Environmental
Eco Rating: Good
Sound: Excellent
Installation Notes:
Internal wall systems
Installation Guide
Solid Wall Insulation requires professional installation to ensure proper performance and safety.
Installation Process
- Assessment - Survey the area and measure requirements
- Preparation - Clear the area and prepare surfaces
- Installation - Install insulation according to specifications
- Sealing - Ensure proper air sealing and vapor barriers
- Finishing - Complete any necessary finishing work
- Quality Check - Verify installation quality and coverage
Professional Installation
Professional installation ensures optimal performance
Specialists have proper equipment and safety gear
Installation typically takes 1-3 days depending on area
Professional installation includes warranty coverage
Regional Considerations
Climate and local factors can affect Solid Wall Insulation performance and installation considerations.
London & South East
Mild winters, warm summers, moderate rainfall
North England
Cold winters, moderate summers
Scotland
Cold winters, moderate summers, high rainfall and wind
Wales
Mild but wet climate, moderate temperatures
Get Free Quotes
Compare prices for Solid Wall Insulation from trusted local installers
Request Live QuotesQuick Stats
Potential Energy Savings
*Estimates based on typical UK home. Actual savings depend on property size, existing insulation, heating system, and usage patterns.