Internal Wall Insulation Cost
Warm up solid walls from the inside
Average Cost per m²
Energy Rating
Annual Savings
Payback Period
About Internal Wall Insulation
Insulation boards or systems fitted to the inside face of external walls. Good option when external insulation is not possible.
R-Value Range
R-2.0 to R-4.0
Typical Lifespan
25+ years
Installation Complexity
Professional
Energy Rating
B
Maintenance Level
None
Cost Category
Premium
Advantages & Considerations
Advantages
- No planning permission needed
- Can be done room by room
- Immediate improvement
- Good for conservation areas
Considerations
- Reduces room size
- Radiators need moving
- Thermal bridging at junctions
- Interior decoration needed
Best Suited For
Conservation areas
Listed buildings
Terraced houses
When external work not possible
Internal Wall Insulation Cost Breakdown
The table below shows typical costs for Internal 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) | £700 | £900 | £1,600 | £225 |
| Medium (40m²) | £1,400 | £1,800 | £3,200 | £450 |
| Large (80m²) | £2,800 | £3,600 | £6,400 | £900 |
| Extra Large (120m²) | £4,200 | £5,400 | £9,600 | £1,350 |
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 Internal Wall Insulation
Different materials offer varying performance characteristics for Internal 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
Internal 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 Internal 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.