L-Shaped Dormers in Greater Manchester
From the first measured survey to the completion certificate, we run l-shaped dormers projects in Greater Manchester as a single, managed piece of work.
L-Shaped Dormers — indicative geometry
L-Shaped Dormers for Greater Manchester homes
Roofs across Greater Manchester are dominated by dense Victorian and Edwardian terraces alongside 1930s and 1950s semi-detached suburbs, and that mix decides almost everything about what a dormer here needs to look like and how it has to be built.
On a Victorian or Edwardian terrace with a rear outrigger, an L-shaped dormer wraps the main rear slope and the back addition into a single continuous structure. It is the only way to get two bedrooms plus a bathroom out of a narrow London-style terrace loft. The junction between the two arms is where these live or die — it needs a properly designed valley and a single continuous membrane.
Key specification
| Configuration | Main rear dormer + outrigger dormer |
|---|---|
| Typical footprint | 18m² – 30m² gained |
| Critical detail | Valley junction and continuous membrane |
| Structure | Two ridge beams plus valley beam |
Planning and building control in Greater Manchester
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 Greater Manchester 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.
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 Greater Manchester
- Pitched Roof Dormers in Greater Manchester
- Shed Dormers in Greater Manchester
- Eyebrow Dormers in Greater Manchester
- Bungalow Dormer Conversions in Greater Manchester
- Dormer Window Replacement in Greater Manchester
- Aluminium Dormer Windows in Greater Manchester
- Dormer Cladding in Greater Manchester
- Dormer Window Repairs in Greater Manchester
FAQs
L-Shaped Dormers in Greater Manchester — FAQs
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.
Can you build a dormer on a bungalow?
Usually yes, and bungalows often give the best results because the spans are wide and there are no party walls. The deciding factor is ridge height: you generally want at least 2.6m from the top of the ceiling joists to the underside of the ridge. We measure this at survey before committing to anything.
Find out what your roof will take
A free measured survey in Greater Manchester tells you what is achievable, what it needs, and what it costs — before you commit to anything.