Flat Roof Dormers in Glasgow and Clyde
We are a dormer specialist, not a general builder who occasionally does roofs — and across Glasgow and Clyde that focus shows up in the detailing.
Flat Roof Dormers — indicative geometry
Flat Roof Dormers for Glasgow and Clyde homes
Glasgow and Clyde is a mix of Victorian and Edwardian terraces, interwar semi-detached houses and post-war bungalows, and each of those wants a different dormer form — which is why we survey before quoting rather than pricing off a photograph.
A flat roof dormer projects square from the roof slope with a shallow-fall flat top, usually finished in GRP fibreglass, EPDM or single-ply membrane. Because the walls are vertical and the ceiling is level, you keep full standing height right up to the window — which is why it is the default choice on rear elevations where planning is under permitted development.
Key specification
| Typical projection | 1.8m – 6.0m wide |
|---|---|
| Roof fall | 1:80 minimum to the rear |
| Roof finish | GRP, EPDM or single-ply membrane |
| Cheek finish | Tile-hung, GRP, lead, zinc or timber |
Planning and building control in Glasgow and Clyde
We run the permitted development test on your specific property: set-back from the eaves, height against the ridge, volume allowance and whether an Article 4 direction applies locally.
Building regulations approval is separate and always required. We submit the application, book the inspections around the programme and hand you the completion certificate at the end — the document a buyer's surveyor will ask to see.
Why homeowners in Glasgow and Clyde use us
We only do dormers. That sounds like a limitation until you have watched a general builder improvise a back gutter on a wet Thursday.
Send us the address and roughly what you are hoping to gain, and we will come back with a realistic answer rather than an optimistic one.
Other dormer work in Glasgow and Clyde
- Aluminium Dormer Windows in Glasgow and Clyde
- Dormer Cladding in Glasgow and Clyde
- Dormer Window Repairs in Glasgow and Clyde
- Hipped Roof Dormers in Glasgow and Clyde
- L-Shaped Dormers in Glasgow and Clyde
- Cat Slide Dormers in Glasgow and Clyde
- Velux to Dormer Conversions in Glasgow and Clyde
- uPVC Dormer Windows in Glasgow and Clyde
FAQs
Flat Roof Dormers in Glasgow and Clyde — FAQs
How wide can a dormer be?
Structurally, as wide as the roof — full-width rear dormers regularly run six to eight metres, carried on a steel ridge beam. The limits are usually planning volume allowances and the setbacks needed at eaves and ridge, rather than what can be built.
What guarantees do you provide?
Structural work carries a ten-year guarantee, GRP and EPDM flat roofing twenty years, windows ten years on frames and sealed units, and lead and zinc work is covered for workmanship for ten years. You also receive the building control completion certificate, which is the document that actually matters when you sell.
Can you build a dormer in winter?
Yes, with adjustments. Temporary weather protection over the scaffold lets structural work continue in most conditions. GRP roofing needs dry conditions above about 5°C to cure properly, so in a cold spell we either sequence it differently or specify EPDM, which is unaffected.
How much does a dormer window cost?
A single flat roof dormer typically runs from around £9,000 to £20,000 supplied and fitted, depending on width, cladding finish and access. A full-width rear dormer on a semi is usually £28,000 to £45,000, and a complete dormer loft conversion including stairs, insulation, plaster and building control sign-off is more commonly £40,000 to £70,000. Our online guide-price tool gives you an indicative range in about a minute.
Does a dormer need building regulations approval?
Yes, always — permitted development covers planning, not building control. A dormer needs approval for structure, thermal performance under Part L, fire escape and protected route under Part B, and stairs under Part K if a staircase is involved. We handle the application, the inspections and the completion certificate.
Find out what your roof will take
A free measured survey in Glasgow and Clyde tells you what is achievable, what it needs, and what it costs — before you commit to anything.