Edwardian semis in Chiswick frequently have a narrow side return — a gap between the house and the side boundary — that can be incorporated into an L-shaped extension. The side element is not covered by permitted development on a semi because it extends beyond the rear wall of the existing side wing.
Hounslow's planning policy for side returns requires that the extension does not result in a terracing effect — i.e. the extension should not read as a continuation of the neighbouring terrace. We set the side element 150mm back from the front face of the existing side wing to maintain the visual distinction.
The rear element extended 3m at full width, with a parapet wall and roof terrace above. Hounslow officers raised one pre-decision query about the materials for the parapet coping — we responded within 24 hours with a materials sample note, and the application was approved without condition.
The combined package cost £840 for planning drawings and the clients then instructed us for building regulations drawings at £1,095. Having the same practice handle both stages ensured continuity — the building regs drawings were coordinated with the approved planning drawings from the start.
If you have a similar project in Hounslow (W4), Planning Drawings in Hounslow starts from £840. Get a free quote in 60 seconds — we respond within 2 hours.