Planning application
2026/2009/P
3 Princess Mews London NW3 5AP
Proposal
Removal of rear roofslope to extend the second floor and enlarge the roof terrace above, replacement access structure to roof and new second floor window to rear wall.
As published by the council, reference 2026/2009/P
Timeline
Dates from the published record
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20 May 2026
Received by Camden
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15 Jul 2026
Decision issued: Granted
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24 Jul 2026
Added to PlanIndex
What a grant of permission means
The process from here
Permission has been granted, usually subject to conditions listed on the decision notice, some of which must be discharged before work starts. The decision notice on the council portal sets out exactly what was approved.
Work must normally begin within three years of the decision or the permission lapses. Neighbours cannot appeal a grant; challenging one means judicial review of how the decision was made, within tight time limits.
About householder applications
How this application type works
Householder applications cover work to an existing house and its garden: extensions, loft and garage conversions, porches, outbuildings and similar alterations within the boundary of the home. They cannot be used to create a separate dwelling or change what the building is used for. Councils aim to decide them within eight weeks, and immediate neighbours are usually notified and given a chance to comment.
Nearby applications
Within 500 metres
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2016/6553/P Granted
4 Princess Mews London NW3 5AP
Alteration to rear slope of existing mansard roof to provide additional living space; erection of glazed roof access extension; installation of four obscure glazed windows to rear elevation; other alterations to front facade
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2017/2916/P Granted
4 Princess Mews London NW3 5AP
Details of materials of glazed roof structure in relation to condition 5 of planning permission 2016/6553/P (dated 15/02/2017) for Alteration to rear slope of existing mansard roof; erection of glazed roof access extension; and other alterations
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2018/3842/P Granted
4 Princess Mews London NW3 5AP
Installation of 1 air-conditioning unit and associated acoustic enclosure on roof terrace (retrospective)
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2022/4945/P Granted
Rear 1st and 2nd Floors (Flat 4) 58 A Belsize Lane London NW3 5AR
Amendment to planning permission (2021/5411/P) dated 31/01/2022 (for Installation of oriel bay window and replacement of two existing windows at the rear and on the side of the building), namely to change the appearance of the oriel bay window from glass to lead cladded solid wall and increase the oriel bay window footprint.
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2021/5411/P Granted
Rear 1st and 2nd Floors (Flat 4) 58A Belsize Lane London NW3 5AR
Installation of oriel bay window and replacement of two existing windows at the rear and on the side of the building.
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2017/3412/P Granted
56 Belsize Lane London NW3 5AR
Removal of condition 3 (personal permission) of planning permission ref: 2014/3227/P (dated 24/07/2014 ) for the change of use from retail (A1) to a veterinary surgery (sui generis).
Other householder applications
In Camden
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2026/3241/P Awaiting decision
15 Eton Villas London NW3 4SG
Single storey rear extension, installation of double-glazed windows and doors, new air-conditioning units, landscaping to rear garden and erection of outbuilding amongst other alterations to the property.
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2026/1084/P Granted
13 Hampstead Hill Gardens London NW3 2PH
Erection of a single storey lower ground floor rear extension following demolition of existing orangery, part enclosure of the existing inset terraces and installation of enlarged rooflight at rear roof level, new window at rear first floor level, replacement roof and installation of rooflight to convert existing garage into habitable space with cycle storage, and replacement windows and doors to all external elevations.
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2026/3200/P Awaiting decision
22 Redington Road London NW3 7RG
Retrospective application for the erection of replacement bin store.
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2026/3150/P Awaiting decision
16 Alvanley Gardens London NW6 1JD
Erection of side and rear extensions at ground and first-floor levels; alterations to the roof including the installation of four rooflights, eight solar panels and four dormer windows to the side and rear roof slopes; installation of external solar shading; replacement of existing single-glazed windows with triple-glazed windows; and installation of external wall insulation to the side and rear elevations to improve the building's energy efficiency.
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2026/3145/P Awaiting decision
3 Christchurch Hill London NW3 1JY
Excavation of the existing front vaults to provide additional amenity floorspace, enlargement of the existing front and rear roof dormers, alterations to the front boundary treatment and associated landscaping, alterations to the rear hard landscaping, including the creation of a new garden with level access; infilling of the first-floor rear balcony to create a new study; installation of a rain garden on the roof of the existing first-floor rear outshot; replacement of existing timber windows and lead roofing; and relocation of the existing rooflight at third-floor level.