Rafter insulation in South Glamorgan

Where we work around South Glamorgan

This takes in the Cardiff and Vale of Glamorgan council areas.

Postcode areas: CF.

Councils	Cardiff and Vale of Glamorgan
Postcode areas	CF
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. It earns its place when you need a warm loft. More about rafter insulation.

Build-up designed for your type of roof underlay
Vapour control layer where the design needs one
Insulated plasterboard lining where specified

Why book with us in South Glamorgan

Clear contact details

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

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.

Plain-English advice

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

How much does rafter insulation cost in South Glamorgan?

£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 Wales

Wales has its own Approved Document L. Insulation alone is not normally notified, but conversions need building control. How the rules work across the UK.

Questions about rafter insulation in South Glamorgan

Do you cover the whole of South Glamorgan?

Yes. We cover every town and village in South Glamorgan, including Cardiff, Barry and Penarth.

Are your prices the same across South Glamorgan?

Yes. Our guide prices are the same everywhere we work, and they include normal travel. Your fixed price depends on your loft, not your postcode.

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.