Cavity Wall Insulation Cost
Fill the gap between your walls to dramatically reduce heat loss
Average Cost per m²
Energy Rating
Annual Savings
Payback Period
About Cavity Wall Insulation
Insulation installed into the cavity between the inner and outer walls of properties built between 1930-1980s. This is one of the most cost-effective insulation upgrades for suitable properties.
R-Value Range
R-2.5 to R-4.0
Typical Lifespan
25+ years
Installation Complexity
Professional
Energy Rating
A
Maintenance Level
None
Cost Category
Standard
Advantages & Considerations
Advantages
- Cost-effective
- Quick installation (2-4 hours)
- No disruption to living space
- Significant energy savings
- Payback period 2-5 years
Considerations
- Only suitable for cavity walls
- Requires professional assessment
- Cannot be easily removed
- May not be suitable for exposed locations
Best Suited For
Houses built 1930-1980s
Properties with cavity walls
Homes with high heating bills
Cavity Wall Insulation Cost Breakdown
The table below shows typical costs for Cavity 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) | £170 | £240 | £410 | £175 |
| Medium (40m²) | £340 | £480 | £820 | £350 |
| Large (80m²) | £680 | £960 | £1,640 | £700 |
| Extra Large (120m²) | £1,020 | £1,440 | £2,460 | £1,050 |
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 Cavity Wall Insulation
Different materials offer varying performance characteristics for Cavity Wall Insulation. Choose based on your budget, performance requirements, and environmental preferences.
Highly Recommended Materials
Mineral Wool
Highly Recommended
Performance
R-Value: R-3.5 to R-4.0
Rating: 9.0/5
Properties
Fire Rating: Excellent (Non-combustible)
Moisture: Good
Environmental
Eco Rating: Good
Sound: Excellent
Installation Notes:
Blown into cavity through small holes
Recommended Materials
Cellulose
Recommended
Performance
R-Value: R-3.0 to R-3.6
Rating: 7.5/5
Properties
Fire Rating: Good (Treated)
Moisture: Fair
Environmental
Eco Rating: Excellent
Sound: Good
Installation Notes:
Blown-in method, settles over time
Alternative Options
Polyurethane Foam
Consider
Performance
R-Value: R-2.5 to R-3.0
Rating: 8.0/5
Properties
Eco Rating: Fair
Fire Rating: Fair (Combustible)
Installation Guide
Cavity 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 Cavity 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
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Potential Energy Savings
*Estimates based on typical UK home. Actual savings depend on property size, existing insulation, heating system, and usage patterns.