Cambridge at a glance
- Postcode districts
- CB5, CB21, CB22, CB23, CB24
- Population
- about 145,674 (GeoNames)
- Council area
- Cambridge City Council
- Building approval
- Cambridge City Council building control, or a registered building control approver
- Guide price region
- East of England (+5% on West Midlands rates)
When is a repair the right answer in Cambridge?
Older flat roofs in Cambridge, as elsewhere, are often covered in felt that has lost its chippings and dried out. One leak on a roof like that is a warning sign. We repair it, check the rest of the covering and tell you honestly whether replacement belongs in next year's budget.
In and around Cambridge, flat roofs are typically found on terraced streets with flat-roofed rear kitchens and bathrooms, and on shops with flat-roofed rear stores below flats. The East of England is the driest part of Britain, with parts of the Anglian region around 630 mm a year, so summer heat and UV, not rainfall, do most of the ageing on a felt roof.
How much does a flat roof repair cost in Cambridge?
For Cambridge we use East of England rates: £160–£530 is the guide for a localised patch repair, VAT included. We confirm the price once we've traced the leak or seen the damage.
| Job | Guide price inc VAT |
|---|---|
| Localised patch repair | £160–£530 |
| Upstand or flashing repair | £260–£680 |
| Outlet or drainage repair | £130–£370 |
| Emergency temporary weatherproofing visit | £190–£470 |
| Condition survey and leak investigation | £160–£320 |
Which repair materials work with my type of flat roof?
The repair has to use the same system as the roof, because many flat roof materials don't bond to each other and some damage each other.
- Torch-on felt: repaired with compatible bitumen membrane, cut back to sound felt and lapped well beyond the defect. Torching near timber, insulation or fascias needs care, and some details are better done with cold-applied methods.
- EPDM rubber: repaired with EPDM patches and the manufacturer's primer and seam tape. Bitumen products and many general-purpose sealants won't bond to EPDM and shouldn't be used on it.
- GRP fibreglass: the area is ground back, then new resin and glass matting are laid and finished with topcoat to match.
- Liquid-applied and single-ply: repaired with the same manufacturer's products wherever possible, as mixing systems can affect a material guarantee.
- Mastic asphalt: cracks and blisters are cut out and made good with new asphalt by an operative who works with it.
A tin of roof sealant or bitumen paint may stop a drip for a while, but on the wrong membrane it makes a proper repair harder later.
What's included?
- Outlets and gutters cleared while we're on the roof
- Inspection of the whole roof, not just the wet patch
- Upstands, flashings, laps and seams made good
- Leak path traced from the stain back to the entry point
Building regulations in England
Replacing more than half of a flat roof over a heated room usually counts as renovating a thermal element, so the roof is insulated to around 0.16 W/m²K where that's technically and economically feasible, and the work is notified to building control: the council or a registered building control approver, unless a registered competent person self-certifies it. A roof on a new extension is built to 0.15 W/m²K. Patch repairs, and most unheated detached garages, don't trigger the upgrade. Structural changes, or a new covering that adds 15% or more to the roof's weight, also need approval. More on the rules.
Which nearby areas do we also cover?
Flat roof repairs in Cambridge: questions
Do you cover Cambridge?
Yes. Cambridge is part of our Cambridgeshire coverage, including postcode districts CB5, CB21, CB22, CB23, CB24. Surveys and roofs are carried out by vetted roofing teams working under S&K Property Investments and Improvement Ltd.
Who checks building regulations for a flat roof in Cambridge?
Where the work needs approval it goes to Cambridge City Council building control, or a registered building control approver. We tell you at the survey whether your job needs it and deal with the paperwork as part of the quote.
How much does a flat roof repair cost in Cambridge?
£160–£530 for a localised patch repair, at East of England guide rates including VAT. We confirm the price once we've traced the leak or seen the damage.
Can you repair the roof if the ceiling is already damaged?
Yes. The roof is fixed first so the ceiling can dry out, and then a plasterer or decorator can make it good. Any wet insulation within the roof should be checked, as it may need replacing.
Will a repair affect my roof's guarantee?
It can. If the roof is still under a manufacturer's material guarantee, the repair should normally use that manufacturer's products and methods, so share any guarantee paperwork with us before work starts.