Flat Roof Replacement
Tired, leaking or patched-up flat roof? We strip it back and re-roof with a modern single-ply system — warmer, watertight and built to last decades.
If your flat roof is past repair, a full replacement is the most cost-effective fix in the long run. We remove the failed covering, assess and upgrade the deck and insulation, then install a brand-new single-ply membrane.
It’s also the perfect opportunity to add a warm-roof build-up, improve drainage and bring the roof up to current Building Regulations — all finished to JLH’s exacting standard and backed by a 20-year workmanship warranty.
Specified and finished properly
- Strip & dispose — of the old, failed covering responsibly.
- Deck inspection & repair — we fix what’s underneath, not just the surface.
- Warm-roof insulation upgrade — for warmer rooms and lower bills.
- New single-ply membrane — installed and hot-air welded throughout.
- 20-year workmanship warranty — plus the manufacturer’s guarantee.
Overlay vs full replacement
Sometimes the existing roof can be overlaid — sometimes a full strip-out is the right call.
| Overlay | Full replacement | |
|---|---|---|
| When | Structure & deck are sound | Failed deck or multiple layers |
| Cost | Lower, less disruptive | Higher, but a fresh start |
| Result | New membrane & insulation | Brand-new roof top to bottom |
A simple, transparent process
Survey
We assess whether you need an overlay or full replacement.
Strip & prep
Remove the old covering and repair the deck.
Insulate & install
Warm-roof build-up and new welded single-ply.
Sign-Off
Detailing, guarantee paperwork and aftercare.
Flat Roof Replacement — common questions
How much does a flat roof replacement cost? +
It depends on size, access and spec — try our instant cost estimator for a guide range, then we confirm everything with a fixed quote after a free survey.
Do I need a full replacement or just a repair? +
If the roof is widely worn or the deck has failed, replacement is best value. A localised fault may just need a repair — we’ll tell you honestly.
Will you upgrade the insulation? +
Yes — a replacement is the ideal time to add a warm-roof build-up to meet current Building Regs.
How long does it take? +
A typical domestic roof is often done in a few days, depending on size, access and weather.
Related advice
Ready to get started?
Book a free, no-obligation survey across Rotherham & South Yorkshire.