Dormer flat roof replacement, lead cheek flashings and new dormer construction across Canterbury and East Kent. GRP & lead specialists. Conservation area experience. Free surveys.
A failing flat roof is usually ageing felt that has cracked, blistered or split at a seam or upstand. Here is how to tell whether yours needs a patch or a recover.
When it is not the answer: If a modern GRP or EPDM roof has a single localised puncture, a patch is enough — you do not need a full recover. Read the full guide.
We locate the failure and check the deck and the falls beneath the covering.
Fixed price for patch or full recover in GRP or EPDM, deck repair included if needed.
Most flat roofs are recovered in one visit; larger areas booked in.
Old covering off, deck repaired, new system laid with proper falls to the outlet.
Site cleared and the roof guaranteed.
| Job | Typical duration |
|---|---|
| Garage / small outbuilding | 1 day |
| Single-storey extension | 1–2 days |
| Dormer flat roof | 1 day |
| Large wrap-around extension | 2–3 days |
GRP needs a dry spell to cure; we schedule around the forecast and never lay onto a wet deck.
Most flat roofs are low and reached from a tower; scaffold only where the flat roof is at height or wraps a two-storey return. Scaffold is specified for: first-floor or wrap-around flat roofs, or where edge protection is needed - always itemised in your written quote, never a hidden extra, and we arrange it.
Canterbury’s medieval core and the Victorian terraces off Wincheap and St Dunstan’s often mean tight frontages, shared rear access and conservation-street constraints, so scaffold and skip placement take planning. Pavement scaffold and skip permits go through Canterbury City Council; allow a few working days on streets like Palace Street, Burgate, St Dunstan’s Street where space is tight.
GRP flat roof · Lead cheeks · New dormer construction · Canterbury CA experience
Canterbury's Victorian and Edwardian terraces are highly suitable for dormer loft conversions — the steep 40–45 degree roof pitch provides good natural head height, and the rear roof slope is typically away from street view, making permitted development consent straightforward in most cases. Dormers added to Canterbury terraces over the past 30 years are now reaching the age where their original flat roof coverings need replacement, and lead cheek flashings that were installed to minimum specification are failing on properties throughout the city.
We carry out the full range of dormer roofing work: GRP replacement of failed or end-of-life dormer flat roof sections, lead cheek and front flashing replacement on existing dormers, and new dormer construction as part of loft conversion projects. Canterbury's conservation areas require additional care in dormer specification — in particular, rear dormers on properties within the city centre conservation area must comply with Supplementary Planning Guidance on dormer size, materials and design, and we advise on this as part of every Canterbury dormer survey.
Failed felt dormer flat roofs on 1990s–2000s conversions on properties across Wincheap, St Dunstan's and the Old Dover Road corridor — these are now 20–30 years old and felt is not designed for this service life in Canterbury conditions. Lead cheek flashing failure on dormers where Code 3 lead was installed as the original specification. Blocked dormer gutters causing overflow behind the lead front flashing on properties where gutter access has not been maintained.
“Dormer flat roof on our Victorian Wincheap terrace had been leaking for two years. GRP replacement sorted it completely. They also replaced the lead cheeks at the same time. Properly done.”
“New dormer construction on our St Dunstan's terrace. Conservation area check done first, permitted development confirmed, job completed within six weeks of survey. Excellent from start to finish.”
“Lead cheek flashings had failed on our dormer — traced the bedroom leak to them. Canterbury Roofing replaced them in Code 5, problem solved. Good clear diagnosis.”
| Job | Typical range | Notes |
|---|---|---|
| Garage / outbuilding | £1,200–£2,000 | EPDM or GRP |
| Single-storey extension | £2,000–£4,000 | GRP for complex shapes |
| Large / wrap-around | £3,000–£6,000 | GRP seamless |
| Dormer flat roof | £800–£2,000 | Incl. lead junctions |
| Felt strip & deck repair | from £300 | Added if deck wet |
Worked example: A 12m² rear kitchen extension off Wincheap recovered in GRP with a soft-deck patch: about £2,600.
No deposit on small flat-roof repairs. Staged payment on larger recovers, materials on site first.
Covering CT1, CT2, CT3, CT4 and surrounding postcodes.
GRP and EPDM systems carry a 10-year workmanship guarantee and 20–35 year material life — far beyond the felt we replace.
If a fault appears in covered work, we come back and put it right. No quibbling, no re-charge.
Quiet, quick work confined to the flat area — minimal mess and usually done in a day. You do not need to stay home for external work - we just need power and access agreed in advance.
EPDM can go on in most conditions; GRP needs dry, so we watch the forecast. The Stour valley holds humidity, so drying times lengthen in autumn and moss returns fast on north-facing and tree-shaded roofs.
Flat-roof dormer re-covering in GRP typically costs £600–£1,400 depending on size. Lead cheek flashing replacement on an existing dormer runs £350–£700. Full dormer construction as part of a loft conversion starts at £4,000–£8,000 for a standard Victorian Canterbury terrace, though this varies significantly with dormer size and structural complexity. Free no-obligation surveys and fixed-price quotations provided.
GRP fibreglass is the recommended covering for dormer flat roof sections in Canterbury. Its seamless installation eliminates the joint failures common in felt, and it handles Canterbury's above-average rainfall without the ponding issues that accelerate felt deterioration. Lead remains the correct specification for dormer cheek flashings — Code 4 minimum, Code 5 on larger or more exposed dormers.
Dormers within the permitted development limits (not exceeding the existing roof plane at the front, not higher than the existing ridge) do not normally require planning permission. However, properties in Canterbury's conservation areas, listed buildings, and Article 4 direction areas may require consent. We always check the planning position as part of the survey for any Canterbury dormer project.
The most common causes on Canterbury period properties are: failed felt that has reached end of life (typical on 1970s–80s dormer additions); lead cheek flashing failure where the lead has cracked or lifted at the junction with the dormer wall; and blocked dormer gutter causing overflow into the dormer structure. We diagnose the cause on the free survey before quoting.
Yes. We carry out full dormer construction including structural work, roofing, lead flashings, window installation and internal finishing. All Canterbury dormer projects begin with a free feasibility survey and planning position check. We obtain permitted development certificates where applicable and advise on the full consent process where required.
No call-out fees. No obligation. An honest quote from a local Canterbury roofer who turns up when they say they will.
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