Loft conversions in Barnet
Barnet approved 625 of the 900 planning applications for loft conversions it decided in the last five years (69%), and the typical decision took 56 days.
London Borough of Barnet · planning applications received Oct 2021 to Oct 2026 · updated 25 Oct 2026
Approved
625 of 900
69% of decided applications; 63 withdrawn, 102 undecided
Typical time to a decision
56 days
median, from 899 decisions with both dates published
Decided within 8 weeks
526 of 899
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 loft conversions 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
Part single, part two storey side and rear extension following the demolition of existing chimney stack and ground floor additions. Roof ex…
26/3171/HSE · decided 23 Oct 2026
Roof extension including hip to gable, rear dormer window, and pitch roof over existing two storey flat roofed side extension with 3no. fro…
26/3179/HSE · decided 23 Oct 2026
Single storey side/rear wrap-around extension including alterations to the patio area and 1no. rooflight. Roof extension involving hip to g…
26/3017/HSE · decided 22 Oct 2026
Roof extension involving side and rear dormer windows with south terrace area with glass balustrade and hand rail
26/3159/HSE · decided 22 Oct 2026
Enlargement of basement/lower ground floor, Part single, part two storey side/rear extensions. Conversion of garage into habitable space, i…
26/3102/HSE · decided 19 Oct 2026
Why Barnet refuses loft conversions
The council's own words, quoted from recent decision notices.
Tenterden Lodge Tenterden Grove London NW4 1SY
“1 Insufficient ecological and Biodiversity Net Gain (BNG) information has been submitted to enable the Local Planning Authority to fully assess the impact of the proposal on biodiversity and protected species. In particular, the absence of a Preliminary Roost Appraisal and a Biodiversity Net Gain Assessment and statuary metric prevents a determination of compliance with Biodiversity Net Gain requirements. As such, the proposal fails to demonstrate compliance with relevant biodiversity legislation and planning policy contrary to Policy G6 of the London Plan (2021) and Policy ECC07 of the Barne…”
30, Greenway Close, Totteridge, N20 8EN
“1 The proposed two storey side and rear extension and dormer roof extension, by reason of their size, scale, massing, bulk, altered pitch, design and siting in an elevated position on a prominent corner location, would result in a disproportionate and unsympathetic addition that would fail to respond sensitively to the established pattern of development and appear unduly incongruous, to the detriment of the character and appearance of the host property, street scene and surrounding area, contrary to Policies D3 of the London Plan (2021), Policies CDH01 and CDH05 of the LB Barnet Local Plan (2…”
275, Oakleigh Road North, Whetstone, N20 0DG
“1 The proposed two-storey rear outbuilding, by reason of its height, scale, bulk, massing, mansard roof design and siting, would fail to appear duly subordinate to the host dwelling and would represent an overly dominant form of development within the rear garden, incongruous to the established pattern of development and detrimental of the character and appearance of the site and surrounding area, 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) 2 The proposed two-storey…”
Other home extensions in Barnet
- Single-storey rear extensions
1,010 of 1,249 approved (81%)
- Single-storey side extensions
217 of 246 approved (88%)
- 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 loft conversion 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.