Loft InsulationInstallers

Room-in-roof insulation in Cornwall

For room-in-roof insulation anywhere in Cornwall, you get a free survey and a fixed written quote.

That includes Redruth, Falmouth, St Austell, Truro and Camborne, and the villages around them.

Guide price £3,995 to £8,995 Cornwall
An attic room being insulated

Where we work around Cornwall

We work across the Cornwall and Isles of Scilly council areas.

Postcodes starting EX, PL and TR are all inside our area.

CouncilsCornwall and Isles of Scilly
Postcode areasEX, PL, TR
Towns listed13

What is room-in-roof insulation?

Most rooms-in-roof are reached by stripping the existing plasterboard on the slopes, fitting insulation between and over the rafters, and re-boarding. Where there is access behind the knee walls, we insulate the eaves voids and the floor behind them too. More about room-in-roof insulation.

  • Eaves voids insulated where accessible
  • Boarding and finishing as agreed on the quote
  • Insulation to slopes, knee walls and flat ceiling

Why book with us in Cornwall

Fixed written price

The price on the quote is the price you pay. It only changes if you change the job, or if we find something hidden, such as rot, and you agree the change in writing first.

Clear contact details

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

No pressure selling

You get everything in writing and decide in your own time.

Photos of the finished loft

You see the work done without climbing the ladder.

How much does room-in-roof insulation cost in Cornwall?

£3,995 to £8,995One room-in-roof, depending on size and finish. 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 England

In England, a loft insulated across more than half its area should reach a U-value of 0.16 W/m²K. Insulation alone is not usually notified to building control. How the rules work across the UK.

Questions about room-in-roof insulation in Cornwall

Are your prices the same across Cornwall?

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.

How do I book a survey in Cornwall?

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

How long does room-in-roof insulation take?

Usually three to six working days for one room, depending on how much is stripped and how it is finished.

Will the room get smaller?

Slightly. Insulated plasterboard over the rafters takes a few centimetres off each slope.

Room-in-roof insulation in other towns

Other loft work in Cornwall

Find out what your loft needs

Free survey and a fixed written quote for installation work. Guide prices first if you prefer.