Planning application
2026/2942/L
3 Holly Mount London Camden NW3 6SG
Proposal
Erection of mansard roof extension, raising of chimneys, opening of second-floor rear window, as well as internal works including removing of partition walls and expansion staircase
As published by the council, reference 2026/2942/L
Timeline
Dates from the published record
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13 Jul 2026
Received by Camden
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24 Jul 2026
Added to PlanIndex
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Decision
Awaiting decision
The statutory target is eight weeks for most applications and thirteen for major development. Extensions of time are common.
What happens while it is decided
The process from here
This application is with Camden for determination. The council publicises it, consults neighbours and technical bodies where required, and weighs the responses against local and national planning policy.
The statutory target is eight weeks for most applications and thirteen for major development, though extensions of time are common. Comments carry most weight while the case is undecided, so check the council portal for the deadline if you want to respond.
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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2026/2623/P Awaiting decision
3 Holly Mount London Camden NW3 6SG
Erection of mansard roof extension, raising of chimneys, opening of second-floor rear window, as well as various internal works
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2025/2158/L Awaiting decision
3 Holly Mount London NW3 6SG
Proposed internal alterations to the Ground floor and Lower ground floor. External alterations include; enclosure of the rear areaway, widening of openings at Ground floor, construction of parapet wall to the rear closet wing, reinstate window arch at 1st floor, installation of rooflight to the rear bathroom.
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2025/2123/P Awaiting decision
3 Holly Mount London Camden NW3 6SG
Proposed internal alterations to the Ground floor and Lower ground floor. External alterations include; enclosure of the rear areaway, widening of openings at Ground floor, construction of parapet wall to the rear closet wing, reinstate window arch at 1st floor, installation of rooflight to the rear bathroom.
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2023/1926/L Granted
4 Holly Mount London Camden NW3 6SG
Creation of en-suite bathroom within existing modern roof extension.
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2013/7576/L Granted
8 Holly Mount London NW3 6SG
Alterations including replacement of modern casement windows at basement, 1st, 2nd and 3rd floor levels with new timber framed casement windows, removal of modern bay and porch at ground level and reinstatement of sash window, plus internal alterations including the reinstatement of timber panelling.
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2013/7540/P Granted
8 Holly Mount London NW3 6SG
Alterations including replacement of modern casement windows at basement, 1st, 2nd and 3rd floor levels with new timber framed casement windows, removal of modern bay and porch at ground level and reinstatement of sash window.
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).