Merton has relatively straightforward PD conditions for loft conversions. The Edwardian semis in this part of Wimbledon are not within any Article 4 direction zones, meaning the standard 40m³ PD allowance applies. The full-width rear dormer added 36.8m³ — within the limit with headroom to spare.
The key dimension to check on full-width dormers is the setback from the side elevation. PD rules require the dormer to be set at least 200mm from the party wall boundary projection. On a full-width configuration, this means the dormer is typically narrower than the full width of the rear elevation — we make this clear in the drawings to avoid ambiguity at LDC application stage.
Merton's planning validation team asked for one additional document — a photograph of the existing roof taken from the rear garden, to confirm the roof pitch. We submitted this within the day, and the LDC was granted without further queries.
The client subsequently instructed a local structural engineer directly for the loft structure. We provided the engineer with our drawings at no additional charge, which is our standard practice to ensure the structural scheme is coordinated with the approved LDC drawings.
If you have a similar project in Merton (SW19), Loft Conversion Drawings in Merton starts from £1,225. Get a free quote in 60 seconds — we respond within 2 hours.