The costs and paybacks shown are approximate, are provided for illustrative purposes only and are based on a gas heated semi-detached house with 3 bedrooms. Installed Costs assume that installation is undertaken by a professional installer and are subject to a discount from an energy supplier. Some of savings may be taken in increased comfort.
| Measure |
Annual saving (£/yr) |
Installed cost £ |
Installed payback |
DIY cost |
DIY payback |
| Cavity wall insulation |
£100-£120 |
Around £135 |
13-16 months |
- |
- |
| Internal wall insulation (1) |
£210-£260 |
From £40m2 |
- |
- |
- |
| External wall insulation (2) |
£220-£270 |
From £1800 |
From 7 years |
- |
- |
| Loft insulation (0-270mm) |
£140-£170 |
Around £135 |
< 1 year |
From £275 |
18 months - 2 years |
| Loft insulation (50-270mm) |
£40-£50 |
Around £200 |
4-5 years |
From £200 |
4-5 years |
| Draught proofing |
£10-£20 |
From £75 |
4-7 years |
From £50 |
3-5 years |
| Floor insulation (3) |
£30-£40 |
- |
- |
From £100 |
From 3 years |
| Filling gaps between floor and skirting board |
Approx. £10 |
- |
- |
Around £20 |
2 years |
| Hot water tank jacket |
Approx. £15 |
From £54 |
From 4 months |
From £10 |
From 8 months |
| Primary pipe work insulation |
Approx. £10 |
- |
- |
£5-£10 |
1-2 years |
(1) Assumes insulating to a u-value of 0.45 W/m2K.
(2) Assumes insulating to a u-value of 0.35 W/m2K. Installed costs assume that walls are being repaired anyway and relates to the additional cost of insulation and labour.
(3) Floor Insulation represents the cost of the insulation only.
(4) When another insulation measure is being installed at the same time.
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