Full-Width Rear Dormers in South Yorkshire
South Yorkshire homeowners come to us for full-width rear dormers that are properly detailed at the junctions — because that is where dormers succeed or fail.
Full-Width Rear Dormers — indicative geometry
Full-Width Rear Dormers for South Yorkshire homes
South Yorkshire is a mix of terraced streets around the former steel and colliery districts plus 1930s ribbon development, and each of those wants a different dormer form — which is why we survey before quoting rather than pricing off a photograph.
A full-width rear dormer runs from party wall to party wall, squaring off the entire rear slope. On a standard terrace or semi it typically converts 12–18m² of crawl space into full-height room — enough for a double bedroom and an en-suite. Set back 200mm from the eaves and 500mm below the ridge, it usually falls inside permitted development on a house that has not been extended before.
Key specification
| Typical projection | 4.0m – 8.0m wide |
|---|---|
| Set-back | 200mm from eaves, 500mm below ridge |
| Structure | Steel ridge beam plus floor steels |
| Roof finish | GRP, EPDM or single-ply membrane |
Planning and building control in South Yorkshire
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 South Yorkshire 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.
Book the survey, get the fixed written price, and decide in your own time. Nothing about that process commits you to anything.
Other dormer work in South Yorkshire
- Shed Dormers in South Yorkshire
- Eyebrow Dormers in South Yorkshire
- Bungalow Dormer Conversions in South Yorkshire
- Dormer Window Replacement in South Yorkshire
- Aluminium Dormer Windows in South Yorkshire
- Dormer Cladding in South Yorkshire
- Dormer Window Repairs in South Yorkshire
- Gable-Fronted Dormers in South Yorkshire
FAQs
Full-Width Rear Dormers in South Yorkshire — FAQs
Is scaffolding included in the price?
Yes. Every quotation we issue includes scaffold design, erection, weekly inspection, hire for the programme and dismantling. Scaffold appearing as an extra afterwards is one of the more common complaints about dormer work, so we price it in from the start.
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.
Find out what your roof will take
A free measured survey in South Yorkshire tells you what is achievable, what it needs, and what it costs — before you commit to anything.