Planning application
25 Park Avenue London NW11 7SL
Works: Extension Loft or dormer Windows or glazing
Permission granted. Work must normally begin within three years of the decision or the permission lapses.
Proposal
Alterations to 3no. existing chimneys and minor alterations to existing side dormer (Phase 1) Roof extensions and alterations involving 2no. side facing hip to gable extensions, 3no. front facing dormer windows, 2 no. rear facing dormer windows, new side gable windows and 2no. rear facing rooflights (Phase 2)
As published by the council, reference 26/1354/192
Application record
- Reference
- 26/1354/192
- Type
- Proposed Lawful Development Certificate
- Status
- Lawful
- Decision
- Lawful
- Received
- 13 Apr 2026
- Validated
- 14 Apr 2026
- Decided
- 11 May 2026
- Ward
- Childs Hill
- Decision by
- Delegated Decision
- Postcode
- NW11 7SL
Site history
Applications at this address on the Barnet register
This site has had 2 applications since 2026: 1 approved, 0 refused.
-
26/2656/HSE Awaiting decision
25 Park Avenue London NW11 7SL
Roof extension including hip to gable to both sides with gable windows, 3no. dormer windows to front elevation, 2no. dormer windows and 2no. rooflights to rear elevation. Alterations to existing chimneys. Replacement of existing ground and first floor windows
Timeline
Dates from the published record
-
13 Apr 2026
Received by Barnet
-
14 Apr 2026
Validated
Checked as complete and ready for consideration.
-
11 May 2026
Decision issued: Lawful
-
25 Jul 2026
Added to PlanIndex
Who's behind it
Company information only, from the register and Companies House
MARKTX Agent, registered in Chelmsford
Active · incorporated 2017 · Chelmsford
4 applications on PlanIndex
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See their track recordDocuments
Plans, drawings, consultee responses and the officer's report
23 documents on file for this application
A planning file usually holds the application form, drawings and site plans, consultee responses, the officer's report and the decision notice.
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Open the documentsWhat this grant of permission means
Barnet granted permission on 11 May 2026, subject to any conditions on the decision notice. Work must normally begin within three years or the permission lapses. More in our guide to what happens after a planning decision.
About lawful development applications
A lawful development certificate is a legal determination that existing or proposed works do not need planning permission; the merits of the scheme are not considered. More in our guide to planning application types.
Nearby applications
Within 500 metres
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16 Park Avenue London NW11 7SJ
Roof extension involving hip to gable with rear dormer window. Single storey side and rear extension insertion of 1no. rooflight, new front hardstanding to driveway and walkway with new pedestrian gate, new bin store to front (Approved under 24/3493/HSE)
Withdrawn Lawful development Extension Loft or dormer +1 12 docsSmall domestic -
25 Park Avenue London NW11 7SL
77% historically approved · decision due ~11 Sep
Roof extension including hip to gable to both sides with gable windows, 3no. dormer windows to front elevation, 2no. dormer windows and 2no. rooflights to rear elevation. Alterations to existing chimneys. Replacement of existing ground and first floor windows
Awaiting decision Householder Extension Loft or dormer +1 20 docsDomestic -
3 Park Avenue London NW11 7SL
61% historically approved · decision due ~8 Sep
Demolition of existing dwellinghouse and construction of new two storey detached dwellinghouse with room in the roof, associated amenity space, off-street parking, refuse and cycle parking and installation of air source heat pump within a timber enclosure
Decided Full applications Demolition 16 docsDomestic -
9 Park Avenue London NW11 7SL
Single storey rear extension with 1no. rooflight. Alterations to roof above kitchen. External level drop down with new steps. New terrace area with new garden retaining wall
Granted Householder Extension Loft or dormer 24 docsSmall domestic -
79 North End Road London NW11 7RL
Sub-division of the existing dwelling into 2no. self-contained flats (Retrospective) Internal alterations to upper flat into 2 bed flat
Refused Amendments New dwelling 12 docsDomestic -
Gatepost Lodge 1 Wellgarth Road London NW11 7HP
1 x Dead Cotinus (applicants ref, T2) - Remove. (amended description) Exempt works
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Other lawful development applications
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26/2679/192 Granted
21 Myddelton Park London N20 0JH
Single storey rear extension and increase in ridge height of existing rear outrigger (Amended description).
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26/1907/191 Granted
8 Golders Manor Drive London NW11 9HT
Use of the property as a self-contained residential unit at ground floor level and the first and second floors as a 4-bedroom, 4-person House in Multiple Occupation (Sui Generis) (AMENDED DESCRIPTION)
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26/2059/192 Refused
Low Ridge Rowley Lane Barnet EN5 3HS
Erection of a rear outbuilding
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26/2066/192 Granted
355 Hendon Way London NW4 3NB
Roof extension involving rear dormer window and 3no. front facing rooflights. Removal of chimney on rear elevation (AMENDED DESCRIPTION)
-
26/2525/192 Granted
39 Ridgeway Avenue Barnet EN4 8TN
Single storey rear extension