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Warm Roof Upgrades Stop heating the sky.

Most flat roofs in South Yorkshire have shockingly little insulation — and you pay for it every winter. A warm roof upgrade adds high-performance PIR insulation above the deck, meets current Building Regs, and cuts heat loss through the roof by up to 80%.

+£40/m² PIR Insulation Meets Building Regs Up to 80% Less Roof Heat Loss
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Grey single ply membrane on a house flat roof, dressed up against brickwork and a pitched roof
0.18
U-value W/m²K
80%
Max cut in roof heat loss
+£40
Per m² extra
Why upgrade

Six reasons it’s a no-brainer.

A warm roof costs a fraction of the rest of the replacement and pays back faster than you'd think.

Lower heating bills

On a poorly insulated roof, a warm roof can cut the heat lost through the roof by 70–80%. That is the roof’s share of your heating, not the whole bill, but you feel it in the room below.

Meets Building Regs

When a flat roof is replaced, Building Regs usually require it to reach a U-value of 0.18 W/m²K. Warm roof construction is how we hit it, and we work out the insulation your roof needs when we quote.

High-performance PIR

Rigid PIR insulation boards, BBA-certified and specified to meet current Building Regs.

No interior disruption

All the work happens on the roof. Your ceiling, lights, and plasterboard below stay untouched.

Cuts condensation risk

A cold roof deck can sweat. Insulating above the deck keeps it warm, and that often solves the damp / black-mould problem people thought was a leak.

Pairs with single ply

A warm roof needs a flexible, watertight outer membrane. Single ply is built for it. The two systems are made for each other.

Cold roof vs warm roof

Same building — very different heat loss.

❄️ Cold roof (old style)
  • • Insulation between ceiling joists
  • • Cold deck sweats — condensation, mould
  • • Typical U-value 0.5–1.0 W/m²K (poor)
  • • Common in pre-2010 felt roofs
  • • Heat escapes through every joist
🔥 Warm roof (modern)
  • • Insulation above structural deck
  • • Warm deck — far lower condensation risk
  • • Built to the Building Regs U-value (usually 0.18 W/m²K)
  • • Required on most replacements today
  • • Pairs perfectly with single ply membrane
FAQ

Warm roof questions

Insulation, Building Regs, and heating bills.

What is a "warm roof"?
A warm roof puts the insulation above the structural deck — between the deck and the waterproof membrane. The whole building stays warm; the roof structure stays the same temperature as the room below. The opposite is a "cold roof" where insulation sits between the ceiling joists and the cold deck sweats.
How much does it cost?
+£40 per m² on top of a standard single ply replacement. So a 30 m² roof goes from £3,000–£3,540 to £4,200–£4,740 with the upgrade. How quickly it pays back depends on how little insulation is there now and how you heat the room below.
Do I need it?
If you're replacing the roof anyway: yes, almost always. When a flat roof is replaced, Building Regs usually require it to reach a U-value of 0.18 W/m²K, and a warm-roof upgrade is how we hit that. There are exceptions for like-for-like repairs.
Will it raise the roof height?
Yes — typically by 100–160 mm. Worth knowing if you've got windows, doors, or upstands at the existing roof level. We measure carefully and tell you up front if it's an issue.
Can you upgrade my existing roof without a full replacement?
Sometimes. If the existing membrane is sound, we can overlay insulation + new single ply membrane directly over the top. This works on roofs in reasonable condition — we'll check yours on a free quote visit and tell you honestly.
Is the insulation safe?
Yes. We use BBA-certified PIR insulation boards as part of a manufacturer-approved warm roof system that meets current Building Regs. Where a building needs non-combustible insulation, we specify mineral wool instead.
From the blog

Warm roof and single ply guides

Local

Why Choose a PVC Warm Roof in Rotherham?

PVC warm roofs for Rotherham, Barnsley, Sheffield and Doncaster — better insulation, weather resistance and lower bills for homes and commercial buildings.

Read the guide
Single Ply

Single Ply Roofing for Rear Extensions with Skylights

Why single ply is the right roof for a rear extension with skylights or a roof lantern: 40+ year lifespan, welded watertight details, and why it beats GRP.

Read the guide
Single Ply

What Is Single Ply Flat Roofing? A South Yorkshire Guide

Single ply flat roofing explained by a South Yorkshire installer — what it is, how it's fitted, real local prices and why it outlasts felt and GRP.

Read the guide
Areas we cover

Warm Roof Upgrades across South Yorkshire

We are based in Kilnhurst, between Rotherham and Mexborough, and cover every town below. Pick yours for local postcodes, the roofs we see most there and recent jobs nearby.

Got a cracked fibreglass roof? Read why we don't fit GRP fibreglass flat roofs.

Free quote visit · No hard sell · Transparent pricing

Ready when you are.

Speak to a real roofer in 30 seconds — or get a transparent price range in 60.

Get a price in 60 seconds Call 07807 815181