Loft insulation in Belfast

Where we work around Belfast

We work in neighbouring Newtownabbey, Lisburn, Carrickfergus and Antrim too.

Postcode districts	BT1, BT2, BT7, BT12
Council area	Belfast City
County or area	County Antrim

What is loft insulation?

We lay the first layer to the depth of the joists, usually 100 mm, so it fills each bay edge to edge with no gaps. The second layer goes across the joists at right angles, which covers the timber and stops it acting as a cold bridge. More about loft insulation.

Cables lifted clear of the insulation where possible
Waste packaging removed
Mineral wool to 270 to 300 mm across the whole loft floor

Why book with us in Belfast

Honest about grants

If you might qualify for funding, we tell you before we quote.

Downlights made safe

Fire-rated covers or a clear zone around recessed lights.

Clear contact details

Your quote says who to call with questions before, during and after the work.

Eaves kept clear

Insulation is held back from the eaves so the loft can still ventilate.

How much does loft insulation cost in Belfast?

£495 to £745Terraced house, average loft, from bare joists. Free survey and a fixed written quote before any work.

Installing insulation in a home is zero-rated for VAT until 31 March 2027 and 5% after that, under HMRC's rules for energy-saving materials (notice 708/6).

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 loft insulation in Belfast

Will I get a written quote for work in Belfast?

Yes. Every quote is in writing with the work, the price and what is included, so you can compare it properly.

Do you take on jobs outside Belfast?

Yes. We also work in Newtownabbey and Lisburn and elsewhere in County Antrim.

Can you visit Belfast outside working hours?

Ask about early, late or weekend appointments when you get in touch, and we will tell you honestly what we can offer.

Can you insulate around downlights?

Recessed downlights need clearance or a fire-rated cover so they do not overheat. We fit covers where needed and leave a clear zone around fittings that cannot be covered.

How deep should loft insulation be?

The Energy Saving Trust recommends at least 270 mm of mineral wool, and that is the depth we install as standard. Building regulations also set an energy standard for the roof when a loft is insulated. It differs between England, Wales, Scotland and Northern Ireland, so we confirm the target for your address on the quote.