Rafter insulation in County Londonderry

Where we work around County Londonderry

We work across the Causeway Coast and Glens, Derry City and Strabane and Mid Ulster council areas.

Postcode areas: BT.

Councils	Causeway Coast and Glens, Derry City and Strabane and Mid Ulster
Postcode areas	BT
Towns listed	6

What is rafter insulation?

Because the whole roof slope, the gables and the party walls now have to be insulated, this costs much more than insulating the floor and saves less heat for the money. We check the roof underlay first: a breathable membrane and a felt with no ventilation gap need different build-ups to avoid condensation. More about rafter insulation.

Vapour control layer where the design needs one
Insulated plasterboard lining where specified
Rigid insulation between the rafters, joints taped

Why book with us in County Londonderry

Plain-English advice

We explain what we find in plain English, and say so when nothing needs doing.

Photos of the finished loft

You see the work done without climbing the ladder.

Tidy work

Dust sheets on the route in and every bit of packaging taken away.

We measure before we quote

Existing depth, joist spacing, wiring and the tank are checked, not guessed.

How much does rafter insulation cost in County Londonderry?

£1,645 to £2,595About 30 m² of roof slope. Free survey and a fixed written quote before any work.

Part of this work can be zero-rated as energy-saving materials until 31 March 2027, and part is standard-rated. If VAT applies, your quote shows which is which.

Work out a guide price for your loft

Building regulations in Northern Ireland

Northern Ireland has its own Building Regulations, with energy guidance in Technical Booklet F1. Upgrading loft insulation may count as a thermal alteration, so check with your council's building control. How the rules work across the UK.

Questions about rafter insulation in County Londonderry

Do you cover the whole of County Londonderry?

Yes. We cover every town and village in County Londonderry, including Derry/Londonderry, Coleraine and Dungiven.

How do I book a survey in County Londonderry?

Send the form or call us. We call back to agree a time and confirm it in writing.

Will it cause condensation?

It can if the build-up is wrong for the roof. Old bitumen felt needs a ventilation gap behind the insulation; a modern breathable membrane may not. We check before we design it.

Is insulating between the rafters better than the loft floor?

Not for saving energy alone. Insulating the floor heats less space and costs far less. Rafter insulation is the right answer when the loft itself needs to be warm.