Stanmore · Harrow
Loft conversion architects in Stanmore
Dormer, hip-to-gable and mansard loft conversions in Stanmore (HA3), planned around head height, stairs and Harrow Council's roof guidance.
What do I need to know about loft conversions in Stanmore?
A loft conversion in Stanmore is often permitted development (up to 40m³ extra volume for terraces, 50m³ for semis and detached houses, no dormers facing the street), but flats, conservation areas and mansards normally need planning permission from Harrow Council.
The rules at a glance
- Up to 40m³ (terrace) or 50m³ (semi/detached) under permitted development
- No dormer on the front roof slope facing the highway
- Lawful Development Certificate recommended for PD lofts
- Mansards and conservation areas: planning permission usually required
General national guidance; every address is checked individually before design.
Planning in Harrow
Harrow's suburban character policies steer extension design towards subordination, pitched roofs and matching brick.
Harrow's guide sets out depth, height and roof-form rules for extensions on its largely suburban 1920s–30s housing. We design to the Harrow Residential Design Guide SPD.
Typical housing we see in Stanmore:
- Period terraces and semis around Stanmore centre
- Post-war infill closer to the HA3 boundary
- Larger detached stock on the leafy northern edge
- Mixed-use frontages along the main high street
How we work
We start remotely: a Matterport scan gives an accurate 3D model of your home, we design options you review on video calls, then produce concept drawings. Planning and Building Regulations drawings follow only if your project needs them.
FAQs
Questions
Everything you need to know about working with DOR Architects.
Often not, if it stays within permitted development limits and the house isn't in a conservation area or Article 4 area. We check your address first and can apply for a Lawful Development Certificate.
As a rule of thumb you need about 2.2m from the top of the ceiling joist to the underside of the ridge. Our 3D scan confirms this precisely.
Our Stages 0–2 (survey, existing drawings and concept design) are offered as a fixed estimated fee; planning drawings (Stage 3) and Building Regulations drawings (Stage 4) are optional add-ons only if you need them.