Planning application
2012/1255/L
20 Mecklenburgh Square London WC1N 2AD
Proposal
Demolition of an existing two-storey closet wing and replacement with the erection of a two-storey rear extension, a new glazed staircase enclosure and roof garden on the flat roof of the proposed rear extension, including a new glass balustrade at first floor level, and internal and external alterations including retrospective consent for works to the main stone staircase to existing flat (Class C3).
As published by the council, reference 2012/1255/L
Timeline
Dates from the published record
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9 May 2012
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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2014/2928/P Granted
20 Mecklenburgh Square London WC1N 2AD
Non-material amendment to change cladding and covering materials in rear extension, change of plan layout of upper ground floor to rear extension by replacing drawing numbers 220_G_020G, 021H and 022G with drawing numbers 220_G_020K, 021K and 022H pursuant to pursuant to approved permission reference 2012/1012/P dated 09/05/2012
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2016/1167/L Granted
Flat 1 20 Mecklenburgh Square London WC1N 2AD
Minor internal alterations including; replace glazed doors on extension with a contemporary design, replace window and door to yard in lower ground floor kitchen with contemporary design replacement, change floor covering of yard from limestone to slate and replace timber cladding on recent extension with render and replace glass balustrade to extension with black metal railings.
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2016/0553/P Granted
Flat 1 20 Mecklenburgh Square London WC1N 2AD
Minor internal alterations including; replace contemporary designed glazed doors on extension with a contemporary design, replace window and door to yard in lower ground floor kitchen with contemporary design, change floor covering of yard from limestone to slate and replace timber cladding on recent extension with render and replace glass balustrade to extension with black metal railings.
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2010/3428/P Granted
20 Mecklenburgh Square London WC1N 2AD
Replacement of first floor rear sash window with French door and fixed lights to non self contained maisonette (Class C3).
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2010/3452/L Granted
20 Mecklenburgh Square London WC1N 2AD
Internal and external alterations to non self contained maisonette (Class C3) at basement, ground and first floor levels including replacement of first floor rear sash window with French door and fixed lights.
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2014/3480/L Granted
20 Mecklenburgh Square London WC1N 2AD
Alterations to cladding and minor change of plan layout to the upper ground floor of the rear extension approved on 09/05/12 (ref: 2012/1255/L). Retrospective.
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).