Planning application
2010/2894/L
Chatham House 90 Heath Street London NW3 1DP
Proposal
Works in association with erection of single conservatory extension at rear lower ground floor level; alterations to side elevation rear, window at ground floor level to be relocated into new opening to rear elevation, and installation of two rooflights to rear slope roof of dwelling house (Class C3).
As published by the council, reference 2010/2894/L
Timeline
Dates from the published record
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23 Sep 2010
Decision issued: Granted
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22 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 heritage and listed buildings applications
How this application type works
Heritage applications concern listed buildings and conservation areas. Listed building consent is needed for works, inside or out, that affect the special interest of a listed building, and carrying out such works without consent is a criminal offence. The council weighs harm to the heritage asset against any public benefit of the proposal.
More on heritage and listed buildings applications in our guide
Nearby applications
Within 500 metres
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2016/2238/P Granted
Chatham House 90 Heath Street London NW3 1DP
Replacement rear conservatory, insertion of first floor rear sash window, insertion x2 rear roof lights, replace rear timber sash windows and replace the front lightwell timber staircase with a metal stair case.
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2016/6118/L Granted
Chatham House 90 Heath Street London NW3 1DP
Discharge of condition 4 (detailed drawings and samples as appropriate) granted under reference 2016/2478/l dated 05/07/16 for replacement rear conservatory, insertion of first floor rear sash window, insertion x 2 rear roof lights, replacement timber sash window on rear closet wing, enlargement of openings to lower ground floor internal walls; spiral stair case to loft space; reinstatement of window joinery and bricking of side facing windows on rear elevation and replace the front lightwell timber staircase with metal affecting a Grade II Listed Building.
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2010/2487/L Granted
90 Chatham House Heath Street London NW3 1DP
Internal alteration to include the creation of an opening between underground center and north vault at front of dwelling (Class C3).
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2010/2881/P Granted
Chatham House 90 Heath Street London NW3 1DP
Erection of single storey conservatory extension at rear lower ground floor level; alterations to side elevation rear, new rooflights to rear roofslope of dwelling house (Class C3).
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2016/2478/L Granted
Chatham House 90 Heath Street London NW3 1DP
Replacement rear conservatory, insertion of first floor rear sash window, insertion x2 rear roof lights, replacement timber sash window on rear closet wing, enlargement of openings to lower ground floor internal walls; spiral stair case to loft space; reinstatement of window joinery and bricking of side facing windows on rear elevation and replace the front lightwell timber staircase with metal.
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2010/0457/L Withdrawn
90 Chatham House Heath Street London NW3 1DP
Internal and external works in association with erection of lower ground and ground floor extensions to rear, two heritage / conservation rooflights to rear roofslope to existing dwelling house (Class C3).
Other heritage and listed buildings applications
In Camden
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2026/3248/L Awaiting decision
15 Eton Villas London NW3 4SG
Single storey rear extension, internal reconfigurations, 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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2026/3213/L Awaiting decision
51, 53, 55, 57 Lamb's Conduit Street London Camden WC1N 3NB
Installation of gas infrastructure including an external gas riser, associated pipework, and internal alterations comprising the relocation of gas meters and associated connections
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2026/2318/L Granted
90 Frognal London NW3 6XB
Structural strengthening of underground vault and underpinning of northern side of ground-floor boot room.
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2026/2136/L Granted
45 Downshire Hill London NW3 1NU
Proposed repair and replacement of front elevation windows with matching single glazed timber sash units. Replacement modern French doors in slim-profile double glazing. Rear windows retained, and repaired as required.
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2026/2122/L Granted
6 Royal College Street London NW1 0TH
Various internal and external changes, including replacement and alteration to timber windows, adjustments to internal layout, installation of fire-rated doors and emergency lighting, relocation and rearrangement of bathroom and kitchen (retrospective).