West Hampstead rear extensions more often start as terrace kitchen projects with party walls on both sides and shared rear drains, not as Heath-edge topography problems.
We confirm conservation and Article 4 for the exact street. Patchy coverage means two neighbouring roads can need different evidence packages.
Level terrace plots still fail when depth ignores established rear lines and neighbour windows. Sections remain the amenity proof, even without Hampstead slopes.
Station-adjacent mansion blocks and converted houses need freeholder analysis before any rear external change is drawn as householder PD.
Party wall notices and build-over agreements sit on the critical path for most terraces. We open those enquiries during design so tender is not surprised at dig.
Open-plan steel openings are coordinated with building regulations fire routes on multi-storey NW6 houses so the ground floor does not erase protected escape.
Where PD remains we prepare LDC drawings; where it does not we prepare Camden householder planning drawings with complete existing and proposed sheets.
Compared with Hampstead Heath-edge slopes, West Hampstead more often turns on terrace building lines and neighbour daylight on level plots. Compared with Highgate, authority is usually single-borough Camden.
Related routes include house extension architects, side-return extensions, and building regulations drawings.
A useful first pack is the address, rear photos, and whether the property is freehold house or leasehold flat. We will not freeze depth until designations and tenure are clear.
Delivery sequence: designations → tenure → survey → massing against terrace lines → PD/LDC or householder package → party wall and drainage → building regulations and tender.
Kilburn-edge streets can differ in grain from the West End Lane core; we write materials and bulk to the host terrace, not a single NW6 language.
Clients who arrive with a catalogue rear depth from another postcode get a pin-specific redraw: existing wing lines, drain positions and neighbour glazing first, furniture layout second. That order keeps West Hampstead rear packages honest under Camden validation.