Loft Insulation Cost
The easiest way to cut your heating bills by up to 25%
Average Cost per m²
Energy Rating
Annual Savings
Payback Period
About Loft Insulation
Insulation laid or installed in the loft space to prevent heat rising through the roof. Often the first and most cost-effective insulation upgrade for any home.
R-Value Range
R-4.0 to R-7.0
Typical Lifespan
40+ years
Installation Complexity
Easy
Energy Rating
A+
Maintenance Level
None
Cost Category
Budget
Advantages & Considerations
Advantages
- Highest impact for cost
- Suitable for all property types
- Can be DIY project
- Easy to top up later
- Government grants often available
Considerations
- Reduces storage space
- Can make loft colder
- Needs proper ventilation
- May require additional access
Best Suited For
All property types
First-time insulation projects
Quick wins for energy efficiency
Loft Insulation Cost Breakdown
The table below shows typical costs for Loft 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) | £90 | £120 | £210 | £188 |
| Medium (40m²) | £180 | £240 | £420 | £375 |
| Large (80m²) | £360 | £480 | £840 | £750 |
| Extra Large (120m²) | £540 | £720 | £1,260 | £1,125 |
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 Loft Insulation
Different materials offer varying performance characteristics for Loft Insulation. Choose based on your budget, performance requirements, and environmental preferences.
Highly Recommended Materials
Mineral Wool
Highly Recommended
Performance
R-Value: R-6.0 to R-7.0
Rating: 9.5/5
Properties
Fire Rating: Excellent (Non-combustible)
Moisture: Good
Environmental
Eco Rating: Good
Sound: Excellent
Installation Notes:
Rolled or blown between joists
Cellulose
Highly Recommended
Performance
R-Value: R-5.5 to R-6.5
Rating: 8.8/5
Properties
Fire Rating: Good (Treated)
Moisture: Fair
Environmental
Eco Rating: Excellent
Sound: Good
Installation Notes:
Blown loose-fill application
Recommended Materials
Natural Sheep Wool
Recommended
Performance
R-Value: R-4.5 to R-5.5
Rating: 7.8/5
Properties
Fire Rating: Good (Naturally fire retardant)
Moisture: Excellent
Environmental
Eco Rating: Excellent
Sound: Good
Installation Notes:
Natural option, slightly lower performance
Alternative Options
Phenolic Foam
Consider
Performance
R-Value: R-4.0 to R-5.0
Rating: 6.5/5
Properties
Eco Rating: Fair
Fire Rating: Excellent (Self-extinguishing)
Installation Guide
Loft Insulation can often be installed as a DIY project with basic tools and preparation.
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
DIY Considerations
Can save 30-50% on labor costs with DIY installation
Basic tools and equipment required
Follow safety guidelines and building regulations
Consider professional advice for complex areas
Regional Considerations
Climate and local factors can affect Loft 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
Quick Stats
Potential Energy Savings
*Estimates based on typical UK home. Actual savings depend on property size, existing insulation, heating system, and usage patterns.