- Guide price
- £120–£360
- Repair price
- Confirmed once the leak or damage is found
- Condition survey report
- £150–£310
- Coverage
- England, Wales, Scotland, NI
Somerset at a glance
- Largest towns
- Bath, Weston-super-Mare, Taunton, Yeovil
- Postcode areas
- BA, BS, TA
- Building control
- Bath & North East Somerset Council, North Somerset Council and Somerset Council
- Neighbouring areas
- Bristol · Wiltshire · Gloucestershire · Dorset
- Guide price region
- South West (+3% on West Midlands rates)
How much does a new roof edge or outlet cost in Somerset?
Guide prices including VAT at South West rates. We confirm the price once we've traced the leak or seen the damage.
| Job | Guide price inc VAT |
|---|---|
| Outlet or drainage repair | £120–£360 |
| Localised patch repair | £150–£520 |
| Upstand or flashing repair | £260–£670 |
| Emergency temporary weatherproofing visit | £190–£460 |
| Condition survey and leak investigation | £150–£310 |
Which flat roofs are common in Somerset?
Flat roofs in Somerset sit on bungalows with flat-roofed side extensions and dormers, 1930s semis with flat-roofed garages and kitchen extensions and newer estates where the first extension roofs are now being replaced. The South West averages roughly 1,260 mm of rain a year and many roofs face wind off the Atlantic, so we specify fixings and edge details for wind uplift as well as drainage. Approximate 1991–2020 regional averages based on Met Office data.
Building regulations in England
Replacing more than half of a roof over a heated room usually counts as renovating a thermal element, so it is insulated to current standards and notified to building control. Renovated roofs over heated rooms are insulated to around 0.16 W/m²K where that's feasible, and new extension roofs are built to 0.15 W/m²K. In Somerset the application goes to Bath & North East Somerset Council, North Somerset Council and Somerset Council. More on the rules.
How long do flat roof trims and outlets last?
Properly fixed GRP or aluminium trims and well-installed outlets should last about as long as the waterproofing they are part of. What shortens their life is poor fixing, movement in a rotten deck edge and blockages that are never cleared.
A quick check of outlets and gutters each autumn, and again after storms, prevents most drainage problems. Look for leaves and silt in outlets, gutters pulling away from the fascia, trims that have lifted or split at joints and staining on the wall below the edge. The maintenance guide lists what to check and when. Only check what you can see safely from the ground, a window or a ladder at the edge, and never walk on a roof that isn't designed for it.
Why does water sit on my flat roof?
Water sits on a flat roof because it can't drain off fast enough: the falls are too shallow, part of the roof slopes the wrong way, the deck has sagged between joists, or an outlet is blocked or set too high.
Current guidance on flat roof design (BS 6229) means most roofs need to achieve a finished fall of at least 1:80, and roofs are commonly designed with a steeper fall, such as 1:60, so that building tolerances and deck deflection still leave enough slope. Many older roofs were built with less, or have settled over time.
A small amount of water that clears within a day or two of rain is often tolerable. Deeper ponding that lingers adds weight, holds dirt and debris, can shorten the life of some coverings and turns any small defect into a leak. A patch won't fix it, because the problem is the shape of the roof. The fix is to correct the falls, either with firring pieces under a new deck or with tapered insulation in a warm roof, or to add or lower outlets so water has somewhere to go. Our ponding water guide explains this in more detail.
Which towns in Somerset do we cover?
Edge trims, outlets and drainage in Somerset: questions
Which towns in Somerset do you cover?
All of Somerset. The main towns have their own pages below, and if yours isn't listed we still cover it: send your postcode and we'll confirm.
How much does a new roof edge or outlet cost in Somerset?
£120–£360 for an outlet or drainage repair, at South West guide rates including VAT. We confirm the price once we've traced the leak or seen the damage.
Which postcode areas do you cover in Somerset?
All of Somerset, including the BA, BS, TA postcode areas. Send your full postcode and we'll confirm.
Can you add a new outlet to an existing flat roof?
Usually, yes. The outlet is cut in at a low point, connected to a downpipe or gutter, and the waterproofing is dressed into it with compatible materials. Whether it solves ponding depends on whether water can actually reach it.
Is some standing water on a flat roof normal?
A thin film that clears within a day or two of rain is common and usually harmless. Deeper water that lingers for days points to poor falls, a sagging deck or a blocked outlet and should be looked at.
What's the difference between a drip trim and an edge trim?
An edge trim finishes the edge of the roof and holds the waterproofing down. A drip trim has a profile that throws water clear into the gutter. On many roofs a single trim does both jobs.
Everything about edge trims, outlets and drainage → · All flat roofing in Somerset →