Action Surrey: Surrey's Low Carbon Community

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Insulation: Room-in-Roof

Typically, 1/4th of a property’s heat is lost through an un-insulated roof, substantial savings on your engergy bill can be made by insulating your room-in-roof. 

If you are considering converting your loft into a room, then you will need to get this insulated to ensure that it is a warm, habitable space.

How does room-in-roof insulation work?

This is typically done by fixing rigid insulation boards between the rafters of the roof, and then covering these boards over with plasterboard. Flexible insulation or thermal lining boards can also be used, although sometimes these are less effective.

If you already have a room in your roof but you notice that it gets particularly cold, then it may need rafter insulation. It is perfectly possible to do this, although the room will need to be redecorated after completion.

How much can you save?

England, Scotland and Wales

Loft insulation (0 to 270mm)Detached houseSemi-detached houseMid terrace houseDetached bungalow
Fuel bill savings per year £225 £135 £120 £195
Typical installation cost**   (if no grant applies)  £395 £300 £285 £375
Carbon dioxide savings (kgCO2/year) 920 kg 550 kg 490 kg 790 kg
Loft insulation top up (120 to 270mm)Detached houseSemi-detached houseMid terrace houseDetached bungalow
Fuel bill savings per year £21 £12 £11 £17
Typical installation cost**    (if no grant applies)  £290 £240 £230 £280
Carbon dioxide savings (kgCO2/year) 80 kg 50 kg 40 kg 70 kg

You can save up to £400 per year through room in roof insulation. The costs can vary significantly depending on the size but, depending on the nature of your property, there may be government funding to help with this.

Consideration: Installing Renewable Energy

If you need to put up scaffolding in order to convert your loft (for example, to put in sky lights or to re-roof the property) then why not take the opportunity to install solar panels? Much of the cost will be absorbed in the rest of the project, meaning that you can enjoy a reduced cost for the panels and the benefits they can bring.

For more information contact Action Surrey on 0800 783 2503 or email info@actionsurrey.org

Alternatively, fill out our enquiry form online to obtain a survey and no-obligation quote.

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*All figures are taken from the Energy Saving Trust April 2019 figures