Insulation Savings Calculator
Calculate how much you'll save by adding loft insulation, wall insulation, or pipe insulation to your home.
Insulation Savings Calculator
Estimated property area: 160 m²
Estimated roof area: 96 m²
Total Investment
£17328.00
for all improvements
Annual Savings
£1899.20
per year
Payback Period
9.1
years
Heat Loss Reduction
Typical UK home loses 25% through loft, 33% through walls, 15% through floor, 10% through windows
Recommended Improvements (Priority Order)
Loft Insulation
25% heat lossUpgrade from 0mm to 270mm
Cost
£480.00
Annual Saving
£240.00
Payback
2.0 yrs
ROI
50%
Cavity Wall Insulation
33% heat lossFill cavity walls with mineral or foam insulation
Cost
£2288.00
Annual Saving
£499.20
Payback
4.6 yrs
ROI
22%
Solid Wall Insulation
35% heat lossInternal insulation boards (reduces room size) or External insulation with render (maintains room size)
Internal: £4160, External: £7280
Cost
£4160.00
Annual Saving
£728.00
Payback
5.7 yrs
ROI
18%
Ground Floor Insulation
15% heat lossInsulate suspended floor or concrete slab
Cost
£2400.00
Annual Saving
£192.00
Payback
12.5 yrs
ROI
8%
Double Glazing Upgrade
10% heat lossReplace single with modern double glazing
Cost
£8000.00
Annual Saving
£240.00
Payback
33.3 yrs
ROI
3%
Quick Wins (payback under 5 years)
- ✓Loft Insulation
£480.00 investment, £240.00 annual saving - ✓Cavity Wall Insulation
£2288.00 investment, £499.20 annual saving
Long-term Investments (5-15 years)
- ▪Solid Wall Insulation
£4160.00 investment, £728.00 annual saving - ▪Ground Floor Insulation
£2400.00 investment, £192.00 annual saving
Insulation Types Explained
Loft Insulation
Laying insulation material (mineral wool, cellulose, sheep's wool) between joists. Easiest to install, biggest impact.
- Saves 25% heat loss (largest source)
- Recommended depth: 270mm
- DIY possible for some properties
- Cost: £2-5 per m²
Cavity Wall Insulation
Filling the gap between inner and outer brick layers with foam, mineral wool, or beads. Permanent and unobtrusive.
- Saves 33% heat loss
- Only works on cavity walls (post-1920)
- Professional installation required
- Cost: £10-15 per m²
Solid Wall Insulation
For properties with solid brick walls. Internal boards or external render. More complex and expensive.
- Saves 35% heat loss
- Internal: reduces room space
- External: maintains room size, more visible
- Cost: £20-35 per m²
Ground Floor Insulation
For suspended floors, adds rigid insulation boards below joists. For concrete slabs, internal rigid boards.
- Saves 15% heat loss
- Often overlooked but worthwhile
- Access required from below (hard in flats)
- Cost: £8-15 per m²
💡 Installation Tips
- Always use MCS-accredited or trusted installers
- Request a survey first to identify suitable insulation types
- Check for damp or condensation issues before insulating
- Ensure adequate ventilation after insulation work
- Many installers offer phased payments to spread costs
- Check local authority grants before starting work
- Ask about warranty periods (typically 25+ years for cavity fill)
- Combine improvements for better results and grant eligibility
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