Portishead at a glance
- Postcode districts
- BS20
- Population
- about 26,355 (GeoNames)
- Council area
- North Somerset Council
- Building approval
- North Somerset Council building control, or a registered building control approver
- Nearest main town
- Bristol, about 8 miles
- Guide price region
- South West (+3% on West Midlands rates)
What flat roof work do we do in Portishead?
Warm roof insulation upgrades
Kitchen extensions in Portishead, as elsewhere, produce a lot of moisture from cooking. Under a cold flat roof, that moisture can condense on the deck. A warm roof keeps the deck warm and puts a vapour control layer in the way, which lowers the risk considerably.
Liquid-applied roofing
Liquid systems suit balconies and walkways in Portishead because they form neatly at door thresholds, railings and drains, and some products are designed to take foot traffic. Converting a roof into a new terrace is a different matter, and usually needs planning permission first.
Green and sedum roofs
If you're replacing an old flat roof in Portishead, it's worth deciding whether to add sedum at the same time. If the structure can take it, that is the ideal moment, because the waterproofing is new and the green layers won't need lifting for a long time.
All flat roof services in Portishead:
- Balconies and roof terraces
- Flat roof repairs
- Flat roof surveys and leak tracing
- Flats, HMOs and block roofs
- Warm roof insulation upgrades
- Commercial flat roofing
- Flat roof replacement
- GRP fibreglass roofing
- Torch-on felt roofing
- Single-ply membrane roofing
- Green and sedum roofs
- Extension and kitchen roofs
- Liquid-applied roofing
- EPDM rubber roofing
- Dormer roofs
- Garage roofs
- Emergency leak repairs
How much does a flat roof cost in Portishead?
Guide prices at South West rates including VAT. New and replacement roofs get a fixed price after a free survey; repair prices are confirmed once we've found the problem.
| Job | Guide price inc VAT |
|---|---|
| Emergency temporary weatherproofing visit | £190–£460 |
| Single garage (18 m²), EPDM rubber | £1,650–£2,900 |
| Extension (20 m²), felt, new deck + insulation | £2,800–£4,850 |
| Condition survey and leak investigation | £150–£310 |
| Upstand or flashing repair | £260–£670 |
What flat roofs are typical in and around Portishead?
In a town like Portishead flat roofs are mostly on shops with flat-roofed rear stores below flats and lock-up garage blocks on estates. Local weather shapes the specification. 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.
Who approves flat roof work in Portishead?
Where approval is needed it goes to North Somerset Council building control, or a registered building control approver. 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. How the rules work.
Which places near Portishead do we cover?
Flat roofing in Portishead: questions
Do you cover Portishead?
Yes, including postcode districts BS20. Send your postcode with your enquiry and we'll arrange a survey.
Can you repair a leaking flat roof in Portishead?
Yes. We trace where the water is actually getting in first, because the leak inside is rarely under the defect outside, then repair with materials compatible with your roof.
How much is a new flat roof in Portishead?
A typical 18 m² EPDM garage roof is £1,650–£2,900 and a 20 m² insulated EPDM extension roof is £2,900–£5,050, at South West guide rates including VAT.
What's the best flat roof system for a house in Portishead?
For most garages and extensions it's EPDM or GRP; torch-on felt is the budget option and liquid suits detailed or overlay jobs. We recommend one at the survey.