Box Dormers in Flintshire
Our teams install box dormers throughout Flintshire, handling structure, weatherproofing, glazing and finish as one job with one point of contact.
Box Dormers — indicative geometry
Box Dormers for Flintshire homes
Roofs across Flintshire are dominated by Victorian and Edwardian terraces, interwar semi-detached houses and post-war bungalows, and that mix decides almost everything about what a dormer here needs to look like and how it has to be built.
A box dormer is the plainest form there is: two cheeks, a flat or very shallow top, and a flat front. There is nothing clever about it, which is precisely the point — fewer junctions means fewer places to leak, and a shorter programme on site. Most single-room dormers on post-war housing are box dormers whether or not anyone calls them that.
Key specification
| Typical projection | 1.5m – 3.5m wide |
|---|---|
| Depth | 1.8m – 3.0m into the roof |
| Roof finish | GRP, EPDM or felt |
| Cheek finish | Tile-hung, GRP or vertical cladding |
Planning and building control in Flintshire
If the property is in a conservation area or the dormer faces the road, a full planning application is needed. We prepare the drawings and handle the submission either way.
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 Flintshire use us
Everything is priced from a measured survey, not a phone call — which is why our quotations tend to be the ones that still hold at the end of the job.
If you want to know what your roof will actually take, the survey is free and there is no obligation attached to it.
Other dormer work in Flintshire
FAQs
Box Dormers in Flintshire — FAQs
What is the difference between a dormer and a Velux?
A rooflight sits flush in the roof slope and gives you light without any extra height — you still have a sloping ceiling. A dormer projects out from the roof and creates vertical walls with a level ceiling behind them, so you gain genuinely usable standing space and floor area, not just daylight.
Do you work on listed buildings and in conservation areas?
Yes. That work is detail-led: matching sightlines, glazing bar widths, cill projections and cheek finishes to what survives, and specifying timber, lead and natural slate rather than modern equivalents. We prepare the drawings and heritage statement for listed building consent alongside the planning application.
Can a dormer include an en-suite?
Very often, yes — a full-width or L-shaped dormer usually has enough floor area for a bedroom plus a shower room. The practical constraints are getting soil and waste down to an existing stack, and whether the head height over the shower tray works. Both are settled at survey.
What happens to my existing loft insulation?
It comes out. Insulation at ceiling-joist level is in the wrong place once the loft is a room — the thermal line moves up to the new roof and dormer build-up. We remove and dispose of the old quilt and insulate the new envelope, which is also what makes the room comfortable to use in August.
How long does a dormer take to build?
A single box or flat roof dormer is typically three to five weeks on site. A full-width rear dormer runs five to eight weeks, and an L-shaped dormer on a terrace with an outrigger is closer to seven to ten. A complete dormer loft conversion including the staircase, services and finishes is usually eight to twelve weeks from scaffold up to sign-off.
Find out what your roof will take
A free measured survey in Flintshire tells you what is achievable, what it needs, and what it costs — before you commit to anything.