Greenwich at a glance
- Postcode districts
- SE18, SE7, SE28, SE2, SE3, SE9
- Council area
- Royal Borough of Greenwich
- Building approval
- Royal Borough of Greenwich building control, or a registered building control approver
- Guide price region
- London (+20% on West Midlands rates)
When is a repair the right answer in Greenwich?
Small businesses in Greenwich with a flat-roofed shop, office or unit can't leave a leak running over stock or equipment. A repair stops the water at its entry point, and our inspection tells you whether the rest of the roof needs attention soon or can safely be left for now.
In and around Greenwich, flat roofs are typically found on Victorian and Edwardian terraces with flat-roofed back additions, and on kitchen extensions and roof terraces behind period houses. The Thames basin is one of the drier parts of Britain at roughly 730 mm of rain a year, but summer heat is the bigger test here: dark membranes on south-facing roofs swing a long way in temperature.
How much does a flat roof repair cost in Greenwich?
At London guide rates, a localised patch repair comes to £180–£600 including VAT. We confirm the price once we've traced the leak or seen the damage.
| Job | Guide price inc VAT |
|---|---|
| Localised patch repair | £180–£600 |
| Upstand or flashing repair | £300–£780 |
| Outlet or drainage repair | £140–£420 |
| Emergency temporary weatherproofing visit | £220–£540 |
| Condition survey and leak investigation | £180–£360 |
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?
- Upstands, flashings, laps and seams made good
- Inspection of the whole roof, not just the wet patch
- Leak path traced from the stain back to the entry point
- Repairs with materials compatible with your roof system
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?
- Newham · 3 mi
- Bexley · 4 mi
- Tower Hamlets · 5 mi
- Lewisham · 5 mi
- Barking and Dagenham · 5 mi
- Redbridge · 5 mi
Flat roof repairs in Greenwich: questions
Do you cover Greenwich?
Yes. Greenwich is part of our London coverage, including postcode districts SE18, SE7, SE28, SE2, SE3, SE9. 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 Greenwich?
Where the work needs approval it goes to Royal Borough of Greenwich 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 Greenwich?
£180–£600 for a localised patch repair, at London guide rates including VAT. We confirm the price once we've traced the leak or seen the damage.
Why does my flat roof only leak in heavy rain?
Usually because water only reaches a weak point when it builds up: a partly blocked outlet, a low spot where water ponds, or an upstand that is too low for the depth of water. Wind-driven rain against a wall above the roof is another common cause.
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.