Sabie House 121 Marsh Lane London NW7 4LG

26/2695/HSEHouseholder ApplicationRefused

Householder

Refused on 1 October 2026

Approximate site (title boundary)

Boundary © HM Land Registry, © Ordnance Survey · details

This information is subject to Crown copyright and database rights 2026 and is reproduced with the permission of HM Land Registry. The polygons (including the associated geometry, namely x, y co-ordinates) are subject to Crown copyright and database rights 2026 Ordnance Survey AC0000851063. Conditions of use.

Proposal

Refurbishment of existing property including additional storey with butterfly roof and timber cladding, single storey rear and side extension with glazed link to existing outbuilding, refurbishment of outbuilding as pool plant room and changing area. Raised landscape area connecting house to garden. Relocation of existing swimming pool with raised boardwalk connecting pool to raised garden area

Received: 20 July 2026
Council: London Borough of Barnet
Ward: Edgwarebury
Agent: Pure Design UK

ReceivedReceived20 Jul
ValidatedValidated21 Jul
Consult.Consultation
TargetTarget Date15 Sep
DecidedDecided1 Oct

Decided in 72 days (council typically 56)

About this application

This is a full planning application for a side extension at Sabie House 121 Marsh Lane London NW7 4LG. Barnet has handled 4,516 applications of this type. This one was decided in 73 days, 2 weeks longer than Barnet's typical decision time. There have been 3 other applications at this address. In the past year there have been 50 applications across Edgwarebury. We hold 1,045 applications in total for the NW7 postcode area.

77% of full applications at London Borough of Barnet were approved. Across all application types, the council typically decides in about 8 weeks (median).

Based on decided applications received in the last 3 years.See what's approved near your address

Why it was refused

The proposed development, by reason of its cumulative design approach, architectural form, scale, massing, extensive areas of glazing, roof design, glazed link, terracing, retaining structures, landscape engineering operations and associated material palette, would appear as an unduly incongruous and visually intrusive form of development that fails to respond sensitively to the character, appearance and architectural identity of the existing dwelling or its surrounding context. The proposal would fundamentally alter the established relationship between the dwelling and its landscape setting, resulting in a prominent and overly concentrated form of development unsympathetic to its local context, contrary to Policies CDH01 and CDH05 of the LB Barnet Local Plan (2025), Policy D3 of the London Plan (2021) and the Sustainable Design and Development Guidance SPD (2026)
No Preliminary Roost Assessment has been undertaken and as such the Local Planning Authority is therefore unable to properly assess the likely presence/absence of protected species, including bats, and therefore any potential impact on protected species and their habitats. In the absence of detailed information it is considered that the proposed development could cause undue harm to protected species, contrary to the duty conferred by Section 40 of the Natural Environment and Rural Communities Act 2006, Policy G6 of the London Plan (2021), Policy ECC07 of the LB Barnet Local Plan (2025) and Section 19 of the NPPF (2026)

From the council's decision notice.

Application details

Postcode: NW7 4LG
Application type: Householder Application
Scale / size: Small

Planning application dates

Date validated: 21 July 2026
Consultation expiry: 20 August 2026
Target decision date: 15 September 2026

Applicant and agent

Agent: Pure Design UK
Agent address: 121 Selkirk Road Twickenham TW2 6PT

Planning decision

Statutory period: 56 days

Publicity

Site notice start: 30 July 2026
Site notice end: 20 August 2026

Additional information

Planning Portal ID: PP-15096540
Comments: 0
Documents: 21

Site constraints

Checking the site

2/3

Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

Article 4 direction: Article 4 Small Houses in Multiple Occupation (HMO) Area 1
Tree Preservation Order: Ref TRE/HE/42.1Part of the site · +2 more
Green belt: Barnet
Flood zone 1: Low probability (rivers and sea)

Also checked, none recorded (21)

flood storage areas, conservation areas, listed buildings, scheduled monuments, World Heritage Sites, World Heritage Site buffer zones, registered parks and gardens, registered battlefields, Heritage at Risk entries, nutrient neutrality catchments, national parks, National Landscapes, SSSIs, Special Areas of Conservation, Special Protection Areas, Ramsar sites, ancient woodland, national nature reserves, local nature reserves, heritage coasts and brownfield registers.

A guide only, from official open data; it is not a planning search. Flood zones cover rivers and sea, not surface water.

Data © Crown copyright and others · sources and licences

Contains public sector information from planning.data.gov.uk (MHCLG and local planning authorities), licensed under the Open Government Licence v3.0. © Crown copyright and database right 2026.

© Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026. The Historic England GIS Data contained in this material was obtained on 2026-11-03. The most publicly available up to date Historic England GIS Data can be obtained from HistoricEngland.org.uk.

Contains Ordnance Survey data © Crown copyright and database right 2026.

Planning history at this site

8 other applications at this property, newest first.

Source: Barnet

Contains public sector information from the Planning London Datahub, licensed under the Open Government Licence v3.0.

Track this application

Get email alerts when there is a planning decision or status change.

Get email alerts near NW7

New planning applications delivered to your inbox daily.

Around this site

Nearby applications

Discuss this application on r/PlanningPermissionUK

For applicants and trades

Contractors near this project

Find contractors for extensions near this site

View all contractors

What's been approved on your street?

See what the council approved and refused near this address for the project you have in mind, and the rules that apply here.

Get The Signal Report