Single-storey side extensions in Barnet
Barnet approved 217 of the 246 planning applications for single-storey side extensions it decided in the last five years (88%), and the typical decision took 56 days.
London Borough of Barnet · planning applications received Oct 2021 to Oct 2026 · updated 25 Oct 2026
Approved
217 of 246
88% of decided applications; 11 withdrawn, 21 undecided
Typical time to a decision
56 days
median, from 246 decisions with both dates published
Decided within 8 weeks
147 of 246
8 weeks is the usual statutory period; councils can agree extensions
See what was approved near your own address
The The Signal Report shows approvals and refusals for single-storey side extensions within 250 m, 500 m and 1 km of your home, the council's reasons for refusing similar schemes, your property's planning history and the constraints on the plot. Free preview for any address.
Recent decisions
First and second storey side extension with gabled roof end . Alterations to existing ground floor side extension. New 2no. front rooflight…
26/3131/HSE · decided 20 Oct 2026
Garage conversion with replacement of garage door with new timber door. Changes to fenestration to include: Replacement of existing front d…
26/3093/HSE · decided 14 Oct 2026
Single storey side extension to provide bike store. Addition of a canopy above side door. New timber gates to side. Roof extension involvin…
26/2575/HSE · decided 12 Oct 2026
Part single and part two-storey side extension following demolition of the existing garage; single-storey side/front extension; additional…
26/1382/HSE · decided 21 Aug 2026
Single storey side extension to provide new garage and formation of driveway/hardstanding following removal of timber shed; Insertion of 2n…
26/1784/HSE · decided 15 Jul 2026
Why Barnet refuses single-storey side extensions
The council's own words, quoted from recent decision notices.
39, Old Fold View, Grimsdyke Cres To No Sixty Seven, EN5 4EA
“1 The proposed extensions, by reason of their cumulative scale, excessive height, bulk and unsympathetic design, would result in unduly prominent, incongruous, insubordinate and disproportionate additions to the dwellinghouse. As such, the proposal would be detrimental to the character and appearance of the host property, neighbouring properties, the street scene and the wider locality. The proposal would therefore be contrary to Policies D3 and D4 of the London Plan (2021), Policies CDH01 and CDH05 of the Barnet Local Plan (2025), the principles of the National Planning Policy Framework (202…”
Other home extensions in Barnet
- Loft conversions
625 of 900 approved (69%)
- Single-storey rear extensions
1,010 of 1,249 approved (81%)
- Two-storey and first-floor extensions
720 of 1,042 approved (69%)
How these figures are made
Planning applications London Borough of Barnet received Oct 2021 to Oct 2026, from the council's public planning register as collected by Planning Signal. An application counts as a single-storey side extension when its own description says so (rules-based classification, tested against blind labelled samples). Duplicate records of one application are counted once. The approval figure counts approved and refused planning applications only: withdrawn and undecided ones, lawful development certificates and prior approvals are left out. Decision times use the received (or validated) date and the decision date the council published.
Past decisions describe what happened to other applications. They are not a prediction for yours: every application is decided on its own design and the council's current policies.