Shed Dormers in Pembrokeshire
We design, build and weatherproof shed dormers for homeowners across Pembrokeshire, working from first survey through to building control sign-off.
Shed Dormers — indicative geometry
Shed Dormers for Pembrokeshire homes
Pembrokeshire 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 shed dormer has one plane, pitched more shallowly than the main roof, running back to meet it. Because there are no hips or valleys it is the cheapest wide dormer to build, and it can stretch across most of a rear elevation without looking like a bolted-on box. It suits 1930s semis and chalet bungalows particularly well.
Key specification
| Typical projection | 2.4m – 7.0m wide |
|---|---|
| Pitch | 15° – 25°, shallower than main roof |
| Roof finish | Interlocking tile, slate or membrane |
| Structure | Rafters spanning to a ridge beam |
Planning and building control in Pembrokeshire
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 Pembrokeshire 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 Pembrokeshire
- Gable-Fronted Dormers in Pembrokeshire
- L-Shaped Dormers in Pembrokeshire
- Cat Slide Dormers in Pembrokeshire
- Velux to Dormer Conversions in Pembrokeshire
- uPVC Dormer Windows in Pembrokeshire
- Sash Dormer Windows in Pembrokeshire
- GRP Fibreglass Dormer Roofing in Pembrokeshire
- Flat Roof Dormers in Pembrokeshire
FAQs
Shed Dormers in Pembrokeshire — FAQs
Do I need planning permission for a dormer window?
Rear dormers on a house often fall under permitted development, provided the dormer is set at least 200mm back from the eaves, sits below the ridge line, uses materials similar in appearance to the existing house, and stays within the volume allowance — 40m³ for a terrace, 50m³ for a semi or detached. Front-facing dormers, flats and maisonettes, listed buildings, conservation areas and any property with an Article 4 direction all need a full planning application. We check the constraints on your specific address before we quote.
Will my roof be open to the weather?
No. The roof is only opened once the scaffold, temporary weather protection and materials are all on site, and the dormer is made weathertight — structure, deck, membrane and temporary glazing — before the crew leaves at the end of the opening-up phase. We do not open a roof on a Friday afternoon.
What is the best roof covering for a flat dormer?
GRP fibreglass and EPDM rubber are the two we specify most. GRP cures into a single seamless laminate with bonded trims and suits small tops with several upstands. EPDM is a one-piece membrane that copes better with movement on larger spans. Both carry twenty-year guarantees; mineral felt is cheaper but has a materially shorter life.
What insulation do dormers need?
Current building regulations want around 0.15–0.18 W/m²K for a new dormer roof and 0.18 W/m²K for the cheeks and front. In practice that is a warm-roof build-up using 100–150mm of PIR insulation above or between the structure, with a continuous vapour control layer on the warm side. Getting the VCL continuous matters more than the insulation thickness.
Can you match my existing roof tiles?
Usually. Most common clay and concrete profiles are still in production or available reclaimed, and we source a match at survey stage so you see it before work starts. Where a discontinued profile cannot be matched exactly, we normally recommend taking tiles from a less visible slope for the dormer and using the closest new match on the hidden elevation.
Find out what your roof will take
A free measured survey in Pembrokeshire tells you what is achievable, what it needs, and what it costs — before you commit to anything.