Front and side extension at 17 Lyonsdown Avenue, Barnet

What was proposed

The application proposed a single-storey front and side extension after demolishing the garage, including one new front window.

“Proposal: Single storey front/side extension following demolition of the existing garage and the insertion of 1no. front window…”

Officer report

The site

The site is a semi-detached house with trees protected by tree preservation orders near its rear boundary.

“The application site comprises of a semi-detached dwellinghouse, within the Barnet Vale ward. The site is not located within any Conservation Area, nor does it contain or lie in close proximity of any Listed Building.”

“There are TPOs sited at/near the rear boundary of the site.”

Officer report

Earlier planning history

An earlier application for a single-storey side and rear extension with a roof lantern was granted as lawful in 2012.

“Reference: B/02249/12 Address: 17 Lyonsdown Avenue, Barnet, EN5 1DU Decision: Lawful Decision Date: 21.08.2012 Description: Single storey side/rear extension with a roof lantern.”

Officer report

Officers’ recommendation

Officers recommended approval because the extension would be subordinate, complement the house and avoid undue harm to neighbouring amenities.

“This property is located southwest of the subject site and the proposed is sited along the common boundary with No.19. The proposed will have a maximum height sited at the front elevation of 3.50m due to the false pitched roof and the flat roof will be approximately 3.26m in height. Due to the existing garage that abuts the boundary with No.19 the additional 1.68m forward projection is not considered to give rise to undue harm to the amenities of No.19.”

“This property is located northeast of the subject site and is the adjoining property. Due to the siting of the proposed it will not be visible from No.15 and therefore it is not considered to cause undue harm to the amenities of neighbouring property No.15.”

Officer report

Consultation responses

Trees and landscaping officers requested tree protection and landscaping details, while no public comments were received.

“Trees and Landscaping officers were consulted due to the presence of established shrubs and an early mature pine tree located within the front garden. They requested that a tree protection plan would need to be submitted to ensure that the pine tree is not harmed as well as a soft and hard landscaping plan for the frontage. These considered the proposal acceptable subject to the inclusion of conditions to this application.”

“A site notice was initially posted on the 13.08.2026 and second notice with the revised description posted on the 27.08.2026 within the vicinity of the application site.”

Officer report

Who spoke

The planning officer presented the report, and committee members could ask officers questions.

The decision

The application was approved subject to conditions, with delegated authority for minor changes to the conditions or reasons.

“RESOLVED the application be APPROVED subject to conditions AND the Committee grants delegated authority to the Service Director – Planning and Building Control to make any minor alterations, additions or deletions to the recommended conditions/obligations or reasons for refusal as set out in this report and addendum provided this authority shall be exercised after consultation with the Chair (or in their absence the Vice-Chair) of the Committee (who may…”

Minutes