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Permitted2025/3787/PSubmitted over a year agoRear extension

Fitzjohn's Avenue Camden NW3 5JY

The proposal consists of a single story rear extension to a lower ground floor Flat located at 29 A Fitzjohn's avenue, NW3 5JY. The proposals for the new rear extension are centred around providing more living space to the flat whilst at the same time ensure that good daylight is provided and overlooking is restricted. In response to the conservation area guidelines the design of the extension retains a view along the side to the property to enable glimpses of the garden beyond. The new extension will provide 34.6 sq.m of new gross internal area in a single storey with a flat roof to ensure its subservience to the main building. The neighbouring flat 29B has a bedroom with two windows next to the proposed extension. The side window would be blocked by this proposal but the scheme proposes to increase the size of the bedroom window facing the rear of the property within an existing archway. This will enhance the quality of the light entering the bedroom. Additionally, the proposal also includes a new balcony space for flat C above. Access will be provided through alternations made to an existing rear casement window. The new balcony will be the same width as the existing window. Following pre-planning advice the balcony will be painted steel. In addition, it is noted that the existing window will be able to retain it’s upper stained glass panels. Only the lower casements will need to be re-made so that they extend down to form French doors to the balcony level The applicant for this proposal owns the Freehold of the whole property. In addition, they own the Leasehold of flats 29A, 29B at the Lower Ground Level and 29C at the Upper Ground Level.

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Progress

Submitted
3 Sept 2025
— completed
Validated
3 Sept 2025
— completed
Consultation
5 Oct 2025
— completed
Target date
29 Oct 2025
— completed
Decided
21 Oct 2025
— completed

Application details

Reference
2025/3787/P
Local authority
Camden
Postcode
NW3 5JY
Ward
Belsize
Application type
All Other
Property type
Flat

Key dates

Submitted
3 Sept 2025
Validated
3 Sept 2025
Comments close
5 Oct 2025
Target decision
29 Oct 2025
Decided
21 Oct 2025

Estimated project value

£84k–£140k

Based on the 34.6m² of floor area stated in the application, at inner London rates (2026). Source: FMB / Checkatrade 2026, single-storey extension £1,800-£3,000/m².

Floor area gained: 34.6

Recently sold nearby

New owners, recently moved in. First work on a house usually follows within months of completing. 5 recent sales are listed below.

Homes here go for about £1,840,000 — the median of the last 7 market sales in NW3 5JY, £1,185,000 to £8,200,000.

Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0. Sales are matched by postcode, not by property, so a sale listed here may be a neighbouring address. England and Wales only.

Planning constraints

No designations recorded at this location. This is not a formal search — always confirm with the local authority before relying on it.

Designations from planning.data.gov.uk, Open Government Licence v3.0. Indicative only — not a formal local authority search.

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