Harpenden at a glance
- Postcode districts
- AL5
- Population
- about 30,674 (GeoNames)
- Council area
- St Albans City and District Council
- Building approval
- St Albans City and District Council building control, or a registered building control approver
- Nearest main town
- St Albans, about 5 miles
- Guide price region
- East of England (+5% on West Midlands rates)
What flat roof work do we do in Harpenden?
Extension and kitchen roofs
Extension roofs in Harpenden are often replaced because the original was built cheaply: thin chipboard decks, little or no insulation and felt turned up the wall without a proper flashing. Twenty or thirty years on, those weaknesses show up as leaks at the back wall and a cold, damp ceiling.
Dormer roofs
If your dormer in Harpenden was added years ago with a basic felt roof and little insulation, it will tend to fail at the edges first, and they leave the loft room cold in winter and hot in summer. A warm-roof replacement deals with both problems at once.
Balconies and roof terraces
Settled, rocking or cracked paving is a common reason to re-waterproof a terrace in Harpenden. Slabs bedded directly on the membrane can damage it over time. Relaying them on adjustable pedestals protects the waterproofing and gives a level surface that drains underneath.
All flat roof services in Harpenden:
- Dormer roofs
- Flats, HMOs and block roofs
- Emergency leak repairs
- Balconies and roof terraces
- Single-ply membrane roofing
- Liquid-applied roofing
- Garage roofs
- Flat roof surveys and leak tracing
- Torch-on felt roofing
- Warm roof insulation upgrades
- Commercial flat roofing
- GRP fibreglass roofing
- Extension and kitchen roofs
- Green and sedum roofs
- Flat roof repairs
- EPDM rubber roofing
- Flat roof replacement
How much does a flat roof cost in Harpenden?
Guide prices at East of England 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–£470 |
| Porch or bay (4 m²), EPDM | £800–£1,300 |
| Extension (20 m²), EPDM, insulation + 1 rooflight upstand | £3,150–£5,500 |
| Single garage (18 m²), EPDM rubber | £1,700–£2,950 |
| Extension (20 m²), EPDM, new deck + insulation | £2,950–£5,150 |
What flat roofs are typical in and around Harpenden?
In a town like Harpenden flat roofs are mostly on shops with flat-roofed rear stores below flats and lock-up garage blocks on estates. Rain and wind decide how a flat roof is detailed. 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. Approximate 1991–2020 regional averages based on Met Office data.
Who approves flat roof work in Harpenden?
Where approval is needed it goes to St Albans City and District 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 Harpenden do we cover?
- St Albans · 5 mi
- Luton · 5 mi
- Hemel Hempstead · 6 mi
- Welwyn Garden City · 7 mi
- Hatfield · 7 mi
- Dunstable · 9 mi
Flat roofing in Harpenden: questions
Do you cover Harpenden?
Yes, including postcode districts AL5. Send your postcode with your enquiry and we'll arrange a survey.
How much is a new flat roof in Harpenden?
A typical 18 m² EPDM garage roof is £1,700–£2,950 and a 20 m² insulated EPDM extension roof is £2,950–£5,150, at East of England guide rates including VAT.
Can you repair a leaking flat roof in Harpenden?
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.
Do you also cover St Albans?
Yes. St Albans is about 5 miles from Harpenden and we cover it too.