Belsize Lane Camden NW3 5AB
PROPOSAL Replacement of existing single storey extension at lower ground level and associated alterations to rear elevation including installation of external stairs. Alterations to façade and roof of existing outbuilding facing main building. DESCRIPTION OF PROPOSED ALTERATIONS UPPER GROUND FLOOR Partial removal of internal partitions dividing the living room and the dining room to enhance the connection between these spaces and the activities therein, as well as emphasising the dual front quality of these spaces. LOWER GROUND FLOOR Alteration of internal partitions to link the bedroom area with the rear patio/terrace. The proposal includes the reinstatement of a sash window in the northern bedroom that was blocked in a previous refurbishment. The rear façade alterations at the lower ground floor also include a small north facing clerestory window. REAR EXTENSION The volume of the rear extension is located at a sunken patio and mostly hidden in the lower ground floor as the adjacent garden and properties are at a higher level. The height of the adjacent boundary walls and fences prevents direct side views from the adjacent properties. There are no adjacent properties with a direct frontal view of the rear extension. The aim of the proposed alteration is to create a more rational volume, by straightening its angles, and to provide a connection between the new proposed study areas and the rear patio/terrace with the introduction of sliding doors. A new external staircase is proposed to allow for a better, more immediate connection between the upper ground floor dining room and raised terrace, and the lower ground floor rear patio/terrace and new study areas. The material of the proposed alterations of the rear extensions are red glazed ceramic, referencing architectural landmarks such as iconic Belsize Park tube station as well as the red brick which is part of the palette of the local vernacular; combined with powder-coated steel and aluminium claddings and door frames, coloured in red RAL 3024, referencing the iconic Royal Mail post boxes. The existing glazed balustrade will be replaced with a steel railing powder coated painted to match the colour scheme of the proposed extension. OUTBUILDING The proposal includes an alteration of the front façade of the outbuilding, to enhance the interior space and to provide with a better access and connection to the adjacent garden and terraces; and a new slightly pitched roof to solve current drainage issues with the existing flat roof. The proposed pitched roof includes clerestory windows to enhance access to natural light and ventilation; these clerestory windows don't increase any views towards adjacent properties. The material for the proposed roof alteration is Zinc with standing seams, colour Anthracite.
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Progress
Application details
- Reference
- 2023/4957/P
- Local authority
- Camden
- Postcode
- NW3 5AB
- Ward
- Belsize
- Application type
- Householder
- Property type
- Flat
Key dates
- Submitted
- 10 Jan 2024
- Validated
- 10 Jan 2024
- Comments close
- 11 Feb 2024
- Target decision
- 22 Mar 2024
- Decided
- 22 Mar 2024
Estimated project value
£41k–£75k
Typical UK cost for this job type, at inner London rates (2026). Estimated from the proposal description — planning applications do not state build cost. Source: MyJobQuote / Checkatrade 2026, ~20m² at £1,800-£3,000/m².
Recently sold nearby
Inside the two years most owners do their major work — kitchens, bathrooms, rewires and lofts. 2 recent sales are listed below.
- 16 - 18A BELSIZE LANE, LONDON, NW3 5ABFlat or maisonette · Leasehold · £954,00010 months ago17 Oct 2025
- FLAT 2, ROSSLYN HEIGHTS, 2 BELSIZE LANE, LONDON, NW3 5ABFlat or maisonette · Leasehold · £1,350,00022 months ago14 Oct 2024
- FLAT 5, ROSSLYN HEIGHTS, 2 BELSIZE LANE, LONDON, NW3 5ABFlat or maisonette · Leasehold · £1,925,0002 years ago12 Apr 2024
- 18 BELSIZE LANE, LONDON, NW3 5ABFlat or maisonette · Leasehold · £825,0002 years ago24 Nov 2023
- 22 BELSIZE LANE, LONDON, NW3 5ABSemi-detached · Leasehold · £3,250,0003 years ago11 Aug 2023
- FLAT 4, 8 BELSIZE LANE, LONDON, NW3 5ABFlat or maisonette · Leasehold · £831,0004 years ago7 Jul 2022
- FLAT 1, 8 BELSIZE LANE, LONDON, NW3 5ABFlat or maisonette · Leasehold · £1,495,0004 years ago17 Nov 2021
- FLAT 3, ROSSLYN HEIGHTS, 2 BELSIZE LANE, LONDON, NW3 5ABFlat or maisonette · Leasehold · £1,330,0004 years ago15 Sept 2021
Homes here go for about £1,340,000 — the median of the last 8 market sales in NW3 5AB, £825,000 to £3,250,000.
Contains HM Land Registry data © Crown copyright and database right 2025. 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.
Nearby applications
- Belsize Lane Camden NW3 5ABPermittedNext door
- Belsize Lane Camden NW3 5ABPermittedNext door
- Belsize Lane Camden NW3 5ABPermittedNext door
- Flat 2 26 Belsize Lane London NW3 5ABPermittedAdjoining
- 26 Belsize Lane London NW3 5ABUnknownAdjoining
- Flat 2 26 Belsize Lane London NW3 5ABPermittedAdjoining