Garages, extensions, dormers and roof junctions
Flat-roof repairs and replacements.
Flat roofs usually reveal problems at a seam, outlet, edge trim, penetration or where the roof meets the main building. The correct covering matters, but so do the falls, deck, insulation, drainage and every change in level.
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What homeowners notice
Flat-roof warning signs
- Ponding that remains after rain
- Cracks, blisters or open seams
- Damp at an upstand or wall junction
- Movement or softness in the deck
- Blocked or undersized outlets
- Repeated repairs in the same area
What we can help with
Work included in this service.
Full covering replacement
Deck condition and falls
Edge trims and upstands
Outlets and rainwater details
Warm-roof build-up discussion
Repair or replace?
The right option depends on what we find.
EPDM
A sheet membrane can reduce joints, but detailing, substrate preparation and roof shape still determine suitability.
GRP
A rigid seamless finish can suit some domestic roofs; movement, edge detailing and installation conditions need consideration.
Felt systems
Modern multi-layer systems remain a valid option where the roof, access and detail design suit the method.
What affects the quote
What changes the price.
The price depends on the size and condition of the roof, safe access, materials and any hidden damage found during the work.
- 01
Roof size and shape
- 02
Deck replacement
- 03
Insulation build-up
- 04
Number of upstands and penetrations
- 05
Drainage alterations
- 06
Access and disposal
How the job works
From first contact to completed work.
- 01
Find the failure point
Check whether the defect is in the field of the roof or at a junction.
- 02
Check the build-up
Understand the deck, falls, insulation and drainage before selecting a covering.
- 03
Choose repair or renewal
Compare a dependable local repair with the cost and disruption of replacement.
- 04
Detail and finish
Complete the field, edges, outlets and upstands as one system.
Read before you decide
Guides related to this job.
Flat Roofs
Flat Roof Materials: EPDM vs GRP vs Felt
Compare EPDM, GRP fibreglass, felt and single-ply flat-roof materials by deck condition, detailing, maintenance and cost drivers.
Flat Roofs
Flat Roof Replacement Cost Birmingham
Understand the cost drivers for felt, EPDM, GRP and single-ply flat roofs in Birmingham, including deck condition, insulation, outlets and access.
Extensions & Building
Flat vs Pitched Roof Extension: 2026 Birmingham Cost & Planning Guide
Compare flat and pitched extension roofs by available height, drainage, insulation, junctions, appearance, maintenance and planning context.
Practical answers
Flat roofs questions
Does standing water mean the flat roof must be replaced?
Not automatically. The depth, duration, roof construction and condition of the covering all matter.
Which flat-roof material is best?
There is no universal answer. Roof shape, use, movement, detail complexity, appearance and budget determine the sensible option.
Can insulation be improved during replacement?
Often it can, but the condensation and height details must be designed with the roof build-up rather than added as an afterthought.
Why does the leak appear beside the wall?
Upstands and abutments are common failure points because they handle movement and the transition between horizontal and vertical surfaces.
Get a flat roof quote
Send the postcode and roof details.
Tell J Dowd what you can see, when it started and anything that may affect access.