External Wall Insulation Cost
Transform your homes energy efficiency and appearance
Average Cost per m²
Energy Rating
Annual Savings
Payback Period
About External Wall Insulation
Insulation system applied to the outside of external walls, often with render or cladding finish. Most effective solid wall insulation method.
R-Value Range
R-4.0 to R-6.0
Typical Lifespan
30+ years
Installation Complexity
Professional
Energy Rating
A
Maintenance Level
Low
Cost Category
Premium
Advantages & Considerations
Advantages
- No internal disruption
- Protects existing walls
- Eliminates thermal bridges
- Can improve appearance
- Highest energy savings
Considerations
- Changes external appearance
- Planning permission may be needed
- High cost
- Weather dependent installation
Best Suited For
Detached/semi-detached houses
End terraces
Properties needing major renovation
When appearance change acceptable
External Wall Insulation Cost Breakdown
The table below shows typical costs for External 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) | £1,900 | £2,500 | £4,400 | £325 |
| Medium (40m²) | £3,800 | £5,000 | £8,800 | £650 |
| Large (80m²) | £7,600 | £10,000 | £17,600 | £1,300 |
| Extra Large (120m²) | £11,400 | £15,000 | £26,400 | £1,950 |
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 External Wall Insulation
Different materials offer varying performance characteristics for External Wall Insulation. Choose based on your budget, performance requirements, and environmental preferences.
Material compatibility information will be loaded from your database.
Mineral Wool
Excellent thermal performance
£12/m²
Spray Foam
Superior air sealing
£25/m²
Installation Guide
External 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 External 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 External 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.