20, Duncan Terrace, London, N1 8BZ Data via plota.co.uk

P2026/2453/LBC - Listed Building VALIDATED

Proposal

Installation of an external air-conditioning unit to the rear outrigger elevation at basement level, and serving five internal units within the existing residential accommodation. Data via plota.co.uk

View original council record ↗Last checked

Application progress

✓
Received
17 Sept 2026
✓
Validated
9 Nov 2026
✓
Consultation
12 Nov 2026
Decision
Expected by 11 Nov 2026

Under consideration

No decision has been issued yet. Plota predicts a decision between 30 Dec 2026 and 18 Jan 2027, from Islington's recent listed building works.

Comments are open until 2 Dec 2026

Comment on this application ↗

Site constraints 21

Article 4 directionCAZCentral Activities ZoneLocal Plan Strategic and Development Management Policies - Policy B1 DeliveringAlexandra Palace viewing terrace to St Paul's CathedralCrossrail 2Site within 100m of a TLRN RoadDuncan Terrace/Colebrooke RowWithin 50m ofII
Grade II listed: Numbers 16-21 (Consecutive) and Attached Railings
List entry 1208787 · 17 m away · 14 more listed buildings within 150 m (14 Grade II)
Listed building consent is needed for work that affects the special interest of a listed building, inside or out, on top of planning permission. Setting can be a consideration for buildings nearby; there is no fixed radius.
Show the other 14 with distances
Historic England ↗
Duncan Terrace/Colebrooke Row conservation area
Demolition needs planning permission and permitted development is restricted.
The council must give weight to preserving or enhancing the area's character and appearance. Not every council has published its boundaries as open data.
Council document ↗
Air quality management area: Islington 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 ↗
Central activities zone
The core of central London in the London Plan.
Offices, culture and the other strategic functions of the centre take priority over new housing here.
Article 4 directionCouncil record
Some permitted development rights are withdrawn. The direction is on the council's register but not published as open data.
Council site ↗
CAZCouncil record
Recorded by the council for this site.
Council site ↗
Central Activities ZoneCouncil record
Recorded by the council for this site.
Council site ↗
Local Plan Strategic and Development Management Policies - Policy B1 DeliveringCouncil record
Recorded by the council for this site.
Council site ↗
Alexandra Palace viewing terrace to St Paul's CathedralCouncil record
Recorded by the council for this site.
Council site ↗
Crossrail 2Council record
Recorded by the council for this site.
Council site ↗
Site within 100m of a TLRN RoadCouncil record
Recorded by the council for this site.
Council site ↗
Duncan Terrace/Colebrooke RowCouncil record
Recorded by the council for this site.
Council site ↗
Within 50m ofCouncil record
Recorded by the council for this site.
Council site ↗
IICouncil record
Recorded by the council for this site.
Council site ↗
Also on the record
Wider setting of protected view 1A.2 Alexandra Palace viewing terrace to St Paul's Cathedral; Inside the Islington built-up area; Public transport access: PTAL 6a (excellent), TfL 2023, for the 100 m square; Town centre 18 m away: Angel; Priority habitat 31 m away: Deciduous woodland; Designated open space 31 m away; National infrastructure project 1926 m away: London Strategic Heat Main Project, at pre-application.
Not affected
Outside flood zones 2 and 3 · Not green belt · No scheduled monument at the site

Checked on 10 November 2026. Historic England, the Environment Agency, Natural England, the Planning Inspectorate, Transport for London (public transport access levels, Powered by TfL Open Data, OGL v3.0, contains OS data © Crown copyright and database right 2025) 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 1

Last sold for £2,400,000 in December 2007. Terraced house, freehold.

10 December 2007£2,400,000

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

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Important details

Council
Islington
Application type
Listed Building
Postcode
N1 8BZ
Received
17 Sept 2026
Validated
9 Nov 2026
Ward
St Peter's & Canalside
Case officer
Show
Target decision
11 Nov 2026
Applicant
Show

Decision outlook

Day 2 of the 56-day target. Islington usually decides listed building works by day 57.

Day 255 days to the predicted decision (day 57)
50%decided within 8 weeks
94%approved
347decided in the last year

Plota live figures for listed building works decided by Islington in the last twelve months, from validation. Islington decision record →

Consultation & key dates

Alt. reference
PP-15232533
Comments by
2 Dec 2026
Site or press notice
12 Nov 2026
Islington
Planning Authority Score
2.9/10
Poor
#237 of 296 councils
Relevant to this application:
Other decisions

Islington is slower than most councils at deciding householder applications, ranking #260 out of 296. 53% of applications have the time limit extended, above the 41% national average. Householder applications are slightly more likely to be approved here (93%) than the national average (90%).

Slower than most councils
for householder decisions
These figures are council-wide context, not a prediction for this application. View full council performance
Islington decision statistics
Based on MHCLG data, the year to March 2026
89%
Overall approval rate
Above avg (87%) #132 of 296
93%
Householder approved
Above avg (90%) #130 of 296
43%
Decided in 8 weeks
Below avg (63%) #260 of 296
53%
Extended time limit
Above avg (41%) #241 of 296
89%
Minor dwellings approved
499 decided (1-9 homes)
100%
Major dwellings approved
1 decided (10+ homes)
89%
Change of use approved
19 decided
1,488
Total decisions
167 refused in the year to March 2026

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