Case study · Harrow
Flat roof re-covering over a rear extension in Wealdstone
The flat roof over a Wealdstone rear extension stripped and re-covered in six days in February 2026, with the water-damaged plaster inside patched once the roof was watertight.
- LocationWealdstone (Harrow), HA3
- PropertyHouse with a flat-roofed rear extension
- PhotographedFebruary 2026
- Estimated cost£2,150 to £4,600 + VAT
The starting point
The earliest photos at this address, from May 2025, show the roofline where the rear extension meets the main house, with a rotten fascia and a broken corrugated section along one edge. By February 2026 the flat roof covering over the extension had failed, and water had got in: inside, the plaster on one wall had blown and crumbled.
What we did
- The old covering and rotten timber were stripped off and bagged for removal.
- The roof was cleared and prepared for the new covering.
- A new covering was laid across the whole roof, dressed up the walls of the main house and finished with clean edges.
- Once the roof was watertight, the damp-damaged plaster inside was cut back, patched and made good.
The photos
Every photo was taken on site during the job. Click any photo to enlarge it.
Before
During the work
After
How long it took
The re-covering was photographed from 9 February 2026, when the strip-out started, to 14 February, when the finished roof and the patched wall inside were photographed. Six days.
What this job would cost at 2026 London rates
Estimated from the photographed scope, not the client's invoice
| Item | What the photos show | Estimate (ex VAT) |
|---|---|---|
| Strip and re-cover | Around 30 m² stripped and re-covered, edges and upstands included | £2,000 to £4,300 |
| Plaster patch repair | Blown plaster cut back and made good inside | £150 to £300 |
| Estimated total | £2,150 to £4,600 | |
Flat roof replacement: £60 to £120 per m² across felt, liquid and GRP systems (Trade2Base, MyJobQuote 2026), plus 10 to 20% for London (MyJobQuote). Plaster repair: half a day of plastering. The roof area is estimated from the photos. The roofline work seen in May 2025 is not priced here, because there are no after photos of it. Typical London market ranges, not fixed Soraiz Builders prices.
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