17 Lyonsdown Avenue Barnet EN5 1DU

1. 7 Aug 2026

   Received by Barnet

2. 10 Aug 2026

   Validated

   Checked as complete and ready for consideration.

3. 10 Aug 2026

   Added to PlanIndex

4. Decision

   Awaiting decision

   Decision expected by 5 October 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.

   Barnet took a median of 46 days over the applications it decided in the last year.

This application is with Barnet for determination, against a statutory target of eight weeks. Over the last year Barnet decided householder applications in a median of 56 days. More in our guide to how long planning decisions take.

Householder applications cover work to an existing house and its garden, such as extensions, lofts and outbuildings, and cannot create a separate dwelling or change what the building is used for. More in our guide to planning application types.

• 29 Monks Avenue Barnet EN5 1BZ

  26/1299/HSE Submitted 8 Apr 2026 150 yards away

  77% historically approved · decision due ~3 Jun

  Single storey side and rear infill extension including new front porch following demolition of the side/rear storage. Demolition of the side/rear storage and erection of a single storey infill rear and side extension including the front porch Demolition of the side/rear storage and erection of a single storey infill rear and side extension including the front porch

  Awaiting decision Householder Extension Demolition 9 docs
  Small domestic

• 29 Monks Avenue Barnet EN5 1BZ

  26/0605/192 Submitted 17 Feb 2026 150 yards away

  Roof extension involving hip to gable, rear dormer window and 3no. front facing rooflights

  Granted Lawful development Extension Loft or dormer +1 8 docs

• 96 Longmore Avenue Barnet EN5 1JY

  26/2300/HSE Submitted 18 Jun 2026 150 yards away

  77% historically approved · decision due ~13 Aug

  Single storey rear extension with raised patio and associated privacy screens. Side and front extension and new front porch following the demolition of existing garage, conservatory and shed

  Decided Householder Extension Demolition
  Small domestic

• 96 Longmore Avenue Barnet EN5 1JY

  25/4714/HSE Submitted 25 Nov 2025 150 yards away

  77% historically approved · decision due ~21 Jan

  Single storey side and rear extension with new patio area with associated steps following demolition of the existing conservatory, garage and shed. Single storey front porch extension

  Awaiting decision Householder Extension Demolition 10 docs
  Small domestic

• 29 Monks Avenue Barnet EN5 1BZ

  26/3800/HSE Submitted 20 Oct 2026 150 yards away

  77% historically approved · decision due ~15 Dec

  Single storey side and rear infill extension including new front porch following demolition of the side/rear storage.

  Awaiting decision Householder Extension Demolition
  Small domestic

• 8 Eversleigh Road Barnet EN5 1NE

  25/4038/192 Submitted 6 Oct 2025 200 yards away

  80% historically approved · decision due ~2 Dec

  Raised decking area with access steps and associated railings and balustrades to existing patio. New fence to side of patio area

  Awaiting decision Lawful development 2 docs
  Small domestic

• 26/3827/HSE Awaiting decision

  43 Hermitage Lane London NW2 2HE

  Single storey rear extension with 3no. rooflights following demolition of the existing conservatory. Replacement front bay window and entrance porch. First floor rear juliette balcony. Changes to fenestration including new window openings and enlarged front rooflight

  22 Oct 2026 Householder
• 26/3833/HSE Awaiting decision

  47 Holne Chase London N2 0QG

  Single storey rear extension. Replacement of single glazed windows with double glazing. Alterations to side/rear fenestration. Alterations and replacement of existing rear dormer window addition of 2no. side dormer windows and 3no. rooflights. Installation of cameras and wall lights. Replacement of the front entrance and garage doors, installation of timber side garden gates

  22 Oct 2026 Householder
• 26/3815/HSE Awaiting decision

  17 Hurstwood Road London NW11 0AS

  Single storey rear extension

  21 Oct 2026 Householder
• 26/3800/HSE Awaiting decision

  29 Monks Avenue Barnet EN5 1BZ

  Single storey side and rear infill extension including new front porch following demolition of the side/rear storage.

  Received 20 Oct, published by the council 21 Oct 2026 Householder
• 26/3791/HSE Awaiting decision

  149 Montrose Avenue Edgware HA8 0DZ

  New front hardstanding and vechicular access to provide off-street parking

  Received 20 Oct, published by the council 21 Oct 2026 Householder