L-Shaped Dormers in Edinburgh and the Lothians
From the first measured survey to the completion certificate, we run l-shaped dormers projects in Edinburgh and the Lothians as a single, managed piece of work.
L-Shaped Dormers — indicative geometry
L-Shaped Dormers for Edinburgh and the Lothians homes
Most of the dormer work we take on around Edinburgh and the Lothians is on Victorian and Edwardian terraces, interwar semi-detached houses and post-war bungalows, where the ridge height and the position of the existing purlins set the limits.
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 Edinburgh and the Lothians
Rear dormers on houses often sit inside permitted development, but the volume allowance is consumed by any previous loft or rear extension — so we check the planning history for the address before we say yes.
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 Edinburgh and the Lothians use us
We would rather tell you at survey that your ridge height will not take what you want than take a deposit and find out in week three.
The quickest route is a photograph of the rear elevation over WhatsApp — we can usually tell you what is feasible before anyone visits.
Other dormer work in Edinburgh and the Lothians
- Full-Width Rear Dormers in Edinburgh and the Lothians
- Cat Slide Dormers in Edinburgh and the Lothians
- Velux to Dormer Conversions in Edinburgh and the Lothians
- uPVC Dormer Windows in Edinburgh and the Lothians
- Sash Dormer Windows in Edinburgh and the Lothians
- GRP Fibreglass Dormer Roofing in Edinburgh and the Lothians
- Flat Roof Dormers in Edinburgh and the Lothians
- Hipped Roof Dormers in Edinburgh and the Lothians
FAQs
L-Shaped Dormers in Edinburgh and the Lothians — FAQs
Do you handle the planning application?
Yes. We prepare measured drawings, elevations and sections, submit the application or the lawful development certificate, and deal with the case officer's queries. On conservation and listed work we also put together the heritage justification the application needs.
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.
Find out what your roof will take
A free measured survey in Edinburgh and the Lothians tells you what is achievable, what it needs, and what it costs — before you commit to anything.