1 Upper Cavendish Avenue London N3 3NN Data via plota.co.uk

Pending 26/3472/HSE
Extensions & alterations
Council
Barnet 6.2/10
Date received
24 Sept 2026
Date validated
24 Sept 2026
Postcode
N3 3NN

Description

Remodelling of existing single storey rear extension including replacement of pitched roof with flat roof. First floor rear extension and installation of 2no. side facing rooflights Data via plota.co.uk

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Last checked

Decision outlook

Plota predicts a decision between 7 Nov 2026 and 18 Nov 2026, from Barnet's recent extensions.

Day 11 of the 56-day target. Barnet usually decides extensions by day 52.

Day 1145 days to the 56-day target
87%decided within 8 weeks
75%approved
1,696decided in the last year

Plota live figures for extensions decided by Barnet in the last twelve months, from validation. Barnet decision record →

Site constraints 4

Article 4 direction
Article 4 Small Houses in Multiple Occupation (HMO) Area 1. Named permitted development rights are withdrawn here.
An Article 4 direction withdraws particular permitted development rights, so work that would normally need no application needs one here. Not every council has published its directions.
Air quality management area: Barnet AQMA
The council has declared the area as failing an air quality objective.
Schemes that add traffic, parking or combustion plant are assessed against the area's action plan and may need an air quality assessment.
Council record ↗
Also on the record
Scheduled monument about 248 m away: Manor House moated site, East End Road, Finchley; Inside the Barnet built-up area.
Not affected
Outside flood zones 2 and 3 · Not green belt

Checked on 30 September 2026. The pin for this application is the centre of its postcode rather than the building, so distances to nearby designations are measured from the postcode and can be out by the width of the postcode area. Historic England, the Environment Agency, Natural England and council datasets, Open Government Licence. A boundary can run through a site and the council holds the definitive record: confirm with the council before relying on this.

Sales history 4

Last sold for £860,000 in December 2012. Detached house, freehold.

13 December 2012£860,000
22 November 2005£620,000
24 February 2000£316,000
28 August 1997£294,000

Sale prices from HM Land Registry's price paid record, matched to this application by its address.

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Historical activity at this location

25 nearby applications on record - archival context, not part of the live application.

Within ~100m

Nearby activity

2025
35 Orchard Avenue London N3 3NL
Roof extension involving hip to gable, rear dormer window, 1no. rear and 2no. front facin…
25/3971/192
2025 Approved
28 Orchard Avenue London N3 3NL
Single storey side infill extension with new rooflight following demolition of existing s…
25/0994/HSE
2025
35 Orchard Avenue London N3 3NL
Part single, part two storey side and rear extension with 1no. rooflight following demoli…
25/1596/HSE
2024 Approved
31 Orchard Avenue London N3 3NL
Single storey rear extension with 2no. rooflights with alteration to existing single stor…
24/5451/HSE
2024 Approved
4 Upper Cavendish Avenue London N3 3NN
Single storey rear extension with 2no. rooflights following demolition of existing single…
24/1042/HSE
2024
2 Upper Cavendish Avenue London N3 3NN
Single storey rear extension
24/1159/HSE
2024 Approved
4 Upper Cavendish Avenue London N3 3NN
Roof extension involving hip to gable, rear dormer window, 2no front facing rooflights an…
24/1021/192
2023 Approved
48 Mountfield Road London N3 3NP
Single storey side extension. Roof extension involving hip to gable to one side, replacem…
23/2230/HSE
2023 Approved
44 Mountfield Road London N3 3NP
Conversion of 2no. self contained flats back to a single dwelling house
23/0295/192
2022 Approved
46 Mountfield Road London N3 3NP
Single storey rear extension following demolition of the existing rear addition
22/5669/HSE
2021 Refused
44A Mountfield Road London N3 3NP
Roof extension involving side and rear dormer window with Juliette Balcony
21/6531/FUL
2021 Refused
31 Holly Park Gardens London N3 3NG
Single storey front and side extension. Part single two storey rear extension. Single sto…
21/6095/HSE
2021 Refused
44A Mountfield Road London N3 3NP
Roof extension involving side and rear dormer window with Juliette Balcony
21/4968/FUL
2021 Approved
24 Holly Park Gardens London N3 3NJ
Single storey side and rear extension following partial demolition of existing garage. Re…
21/4557/HSE
2021 Approved
31 Holly Park Gardens London N3 3NG
Single storey front and side extension. Part single part two storey rear extension. Singl…
21/1230/HSE
2020 Approved
43 Mountfield Road London N3 3NR
Conversion of two residential properties into a single-family dwelling. Single storey rea…
20/2593/FUL
2019 Approved
24 Orchard Avenue London N3 3NL
Erection of single storey outbuilding to rear garden
19/4715/192
2019 Approved
32 Orchard Avenue London N3 3NL
New air conditioning unit to ground flat roof; external alterations involving re-renderin…
19/2447/HSE
2019 Approved
3 Upper Cavendish Avenue London N3 3NN
Single storey rear extension following demolition of the existing extension. Changes to f…
19/2850/HSE
2019 Approved
3 Upper Cavendish Avenue London N3 3NN
Roof extension involving hip to gable, rear dormer window, 1no front facing rooflight and…
19/2596/192
2016 Refused
5 Upper Cavendish Avenue London N3 3NN
Single storey rear extension with a proposed depth of 6 metres from original rear wall, e…
16/5317/PNH
2016 Refused
5 Upper Cavendish Avenue London N3 3NN
Single storey rear extension with a proposed depth of 6 metres from original rear wall, e…
16/4791/PNH
2016 Approved
50 Mountfield Road London N3 3NP
Single storey rear extension with a maximum depth of 6.1metres from the original rear wal…
16/2876/PNH
2016 Refused
50 Mountfield Road London N3 3NP
Single storey rear extension with a maximum depth of 6metres from the original rear wall…
16/2486/PNH
2016 Withdrawn
50 Mountfield Road London N3 3NP
Single storey rear extension
16/1647/192
Barnet
Planning Authority Score
6.2/10
Average
#90 of 296 councils
Relevant to this application:
Householder decisions

Barnet is faster than most councils at deciding householder applications, ranking #42 out of 296. Only 25% of applications have the time limit extended, well below the 41% national average - the council usually decides on time. Barnet is also one of the strictest councils - it refuses more householder applications than almost any other, with only 82% approved vs 90% nationally.

One of the strictest councils
only 82% approved vs 90% nationally
These figures are council-wide context, not a prediction for this application. View full council performance
Barnet decision statistics
Based on MHCLG data, the year to March 2026
75%
Overall approval rate
Below avg (87%) #285 of 296
82%
Householder approved
Below avg (90%) #264 of 296
79%
Decided in 8 weeks
Above avg (63%) #42 of 296
25%
Extended time limit
Below avg (41%) #29 of 296
55%
Minor dwellings approved
319 decided (1-9 homes)
90%
Major dwellings approved
21 decided (10+ homes)
41%
Change of use approved
132 decided
2,541
Total decisions
625 refused in the year to March 2026
Source: MHCLG planning statistics · See full council rankings

Sale prices: Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.