Side return extension in Camden

Almost certainly yes — assume a full householder application.

Usually a full application — and the roof form decides it.

Yes — assume a full planning application, and expect Camden's strict basement policy.

If your Hampstead property is listed — and a high proportion of the village's Georgian and early-Victorian houses are — then listed building consent is needed for any works that affect its special character, inside and out, separately from and on top of planning permission.

Usually a full householder application — and your tenure is the first question.

Usually a full application — and often not available at all if you're in a converted flat.

Yes — a full planning application, under Camden's strict basement policy.

Some of Belsize Park's grand villas are listed, and if yours is, listed building consent is needed for works affecting its character inside and out — separate from and additional to planning permission.

Usually a full householder application, and the constraint is as much the neighbours as the conservation area.

Usually a full application — permitted-development loft rights are removed in the conservation area and the Article 4 directions reinforce it.

Yes — a full planning application under Camden's strict basement policy, and the tight terraces make the party-wall and neighbour dimension acute.

A number of Primrose Hill's terraces are listed, and if yours is, listed building consent is required for works affecting its character inside and out — additional to planning permission.

NW1 runs from the Nash terraces around Regent's Park through Camden Town to Somers Town.

NW3 is one of the most constrained districts in London: most of Hampstead village, Belsize Park and the Fitzjohns/Netherhall area falls within conservation areas, with Article 4 directions stripping permitted development from many streets.

NW5's flat-fronted Victorian terraces are classic side-return and loft territory.

NW6 straddles Camden and Brent, with West Hampstead's mansion blocks and Victorian terraces on the Camden side.

WC1 is Georgian Bloomsbury: garden squares, listed terraces and institutional ownership.

EC1N is Hatton Garden and the streets around Leather Lane: narrow historic plots, jewellery workshops and showrooms at street level, and later commercial infill running down to the Camden/City of London boundary.

N1C is King's Cross Central — the old railway lands behind King's Cross and St Pancras, rebuilt as a masterplanned quarter of new apartment blocks, converted gasholders and repurposed goods buildings around Granary Square and the canal.

W1T is eastern Fitzrovia: Georgian terraces above shops around Charlotte Street and Goodge Street, later blocks of flats, and a thick layer of post-war and media-industry offices.

WC1A is the commercial seam where Bloomsbury meets Holborn — New Oxford Street, Bloomsbury Way and Museum Street, where shops, offices and university buildings hold the ground floors and the residents live in flats above them or in side-street mansion blocks.

WC1B is Bloomsbury at its most intact: Georgian terraces around Bedford Square and Great Russell Street, garden squares in institutional and estate ownership, and the British Museum anchoring the middle of it.

WC1E is the university quarter — Gower Street, Store Street and Torrington Place, where UCL and its faculty buildings sit among long runs of brown-brick Georgian terrace.

WC1H covers northern Bloomsbury towards Euston and King's Cross — the Gordon and Tavistock Square terraces, the crescent at Cartwright Gardens, Judd Street, and the post-war blocks and student halls filling the gaps.

WC1N is eastern Bloomsbury — Queen Square, Great Ormond Street, Guilford Street and Lamb's Conduit Street — where hospitals and Georgian terraces share the same blocks.

WC1R is legal London: the gardens and chambers of Gray's Inn, the wide Georgian frontages of Bedford Row and Jockey's Fields, and the streets around Red Lion Square.

WC1V is largely commercial — the office frontages of High Holborn and the blocks around Procter Street, running down towards the City boundary — with a small residential population in flats above and behind the main street.

WC1X is the most residential slice of WC1 — Georgian terraces and squares off Gray's Inn Road, the Calthorpe and Lloyd Baker streets climbing towards Clerkenwell, mansion blocks, and Mount Pleasant on the eastern side.

WC2A is the legal quarter: Lincoln's Inn and Lincoln's Inn Fields, barristers' chambers, the Royal Courts of Justice, Chancery Lane and the LSE campus, with the district's edges reaching Westminster, Islington and the City.

WC2B is the Kingsway–Aldwych spine and the streets behind it — Drury Lane, Great Queen Street and Freemasons' Hall, on the northern fringe of Covent Garden.

WC2H runs from Seven Dials and Denmark Street across Cambridge Circus to Charing Cross Road and Leicester Square, with the Westminster boundary close by.