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Flat Roof Replacement

Time for a new flat roof?
Make it last 40 years this time.

Stripping a tired felt, GRP or asphalt roof and replacing it with a modern single ply membrane is the single biggest upgrade most flat roofs ever get. Done properly, it has a 40+ year design life.

Most homes £100–£118/m² 20-Yr Warranty 1–2 Day Install Free Quote Visit
Get a price in 60 seconds 07807 815181
New grey single ply membrane on a house flat roof, dressed up against the brickwork and the pitched roof above
£90
From / m², larger roofs
20 yr
Warranty
2–4
Day install
40+ yr
Membrane life
What we replace

If your roof is one of these — we’ve done it hundreds of times.

The vast majority of replacements we handle fall into one of four categories.

Old felt roofs

The most common replacement — 1970s–90s felt is usually past saving by year 15.

Failed GRP fibreglass

Cracked or delaminated GRP. Single ply is a far better long-term fix.

Tired EPDM rubber

Shrinkage at edges, glue failures — we replace with mechanically fixed single ply.

Asphalt and chippings

Heavy, dated, and usually leaks at the upstands. Time for something modern.

How it works

From first call to final sign-off — 5 steps.

No drama, no hidden costs, no chasing.

  1. 1

    Free quote visit

    We come out, measure, photograph the existing build-up, agree what stays and what goes.

  2. 2

    Written quote

    Fixed price within 2–3 working days. System specified, warranty terms included.

  3. 3

    Strip out

    Old roof removed cleanly, debris bagged. We sheet-protect surrounding areas.

  4. 4

    Substrate prep

    Deck checked, repaired if needed. New VCL and insulation laid where required.

  5. 5

    New membrane

    Single ply mechanically fixed or adhered. Heat-welded seams, hand-finished detail work.

FAQ

Replacement questions

Quick answers to the things people ask most.

How long does a flat roof replacement take?
Most home roofs are done in a day, and one with roof lanterns, gutters and other details takes two days at most. Commercial work is scheduled with you in advance.
How much does it cost?
£100–£118/m² inc VAT for a single ply replacement on most homes, from £90/m² on larger roofs. Insulation upgrade is +£40/m², and scaffolding adds £1,000–£2,000 on first-floor roofs and higher. A 30 m² single-storey extension is £3,000–£3,540, or £4,200–£4,740 with the insulation upgrade. Get an instant estimate.
Do I need scaffolding?
Only if the roof is on a first floor or higher. Single-storey extensions and most garages can be done from ground or a tower scaffold (much cheaper).
Can you upgrade the insulation while you're at it?
Yes — and we strongly recommend it. When a flat roof is replaced, Building Regs usually require it to reach a U-value of 0.18 W/m²K. We add PIR insulation board to bring it up to spec (+£40/m²), which cuts the heat lost through the roof.
What happens to the old roof?
We strip it, bag it, and take it off site. You don't need a skip unless you want one.
What guarantee do I get?
A 20-year manufacturer-backed warranty on the membrane, plus a 20-year workmanship guarantee from us. Both in writing.
Can I just replace part of the roof?
Sometimes — if there's a clear break (e.g. extension vs. main roof). For the same roof area we always replace fully; patching new onto old creates trouble at the join.
From the blog

Flat roof replacement guides

Repairs & Maintenance

7 Warning Signs Your Flat Roof Needs Replacing

Is your flat roof trying to tell you something? The seven warning signs that it's time to replace it, explained by South Yorkshire flat roof specialists.

Read the guide
Cost & Pricing

How Much Does a Flat Roof Cost? Prices per m² (2026)

How much does a flat roof cost in 2026? Prices per m² and by roof size in South Yorkshire, felt vs GRP vs single ply, and when a repair makes more sense.

Read the guide
Repairs & Maintenance

How Long Do Flat Roofs Last? The Complete Lifespan Guide

How long does a flat roof last? Felt, EPDM, GRP and single ply lifespans compared, what shortens them, and how to get the most years from yours.

Read the guide
Areas we cover

Flat Roof Replacement 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