Mill Hill · Barnet
Loft conversion architects in Mill Hill
Dormer, hip-to-gable and mansard loft conversions in Mill Hill (NW7), planned around head height, stairs and Barnet Council's roof guidance.
What do I need to know about loft conversions in Mill Hill?
A loft conversion in Mill Hill 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 Barnet 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 Barnet
London Borough of Barnet planners are focused on suburban character, garden depths, and rear-extension precedent under Barnet's Residential Design Guidance SPD.
Barnet officers look closely at rear projection, garden depth and the character of suburban streets, especially in Hampstead Garden Suburb and other conservation areas. We design to the Barnet Residential Design Guidance SPD.
Typical housing we see in Mill Hill:
- Period terraces and semis around Mill Hill centre
- Post-war infill closer to the NW7 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.