2 Police Cottages St Albans Road South Mimms Potters Bar Hertfordshire EN6 3PJ Data via plota.co.uk

26/0699/PD42 - PD- Prior Approval 42 day (Hsehold ext) Approved

Proposal

Single storey rear extension Depth: 4.95m, Height: 3.00m, Eaves: 3.00m. Data via plota.co.uk

View original council record ↗Last checked

Application progress

✓
Received
21 May 2026
✓
Consultation
3 Jun 2026
✓
Approved
17 Jul 2026

Approved on 17 Jul 2026 · Delegated Decision · Last checked 17 Jul 2026

Site constraints 6

Green belt: London
Inappropriate development needs very special circumstances.
Green belt policy allows a short list of exceptions, such as limited extensions and replacement buildings. Anything else needs very special circumstances that clearly outweigh the harm. Some green belt land can count as grey belt, where it does not strongly serve the green belt's purposes. The council decides this in its green belt assessment or on each application, so we do not mark it here.
Read the government guidance ↗
Habitat network: Network Expansion Zone
Where habitat is joined up enough to work as a network. Context, not a constraint on its own.
Also on the record
Radon affected area, class 3; Conservation area about 49 m away: South Mimms; Inside the South Mimms built-up area; Natural England's Provisional ALC map (1:250,000, 1970s) had this area as grade 3, but it predates the buildings here and the current map does not class it as farmland.
Not affected
Outside flood zones 2 and 3 · No scheduled monument at the site

Checked on 6 October 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, the British Geological Survey and UK Health Security Agency (radon, contains BGS materials © UKRI) 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.

Building

Floor area92 m² (990 sq ft)
Energy ratingD (66 out of 100), could reach C
PropertySemi-detached house, 6 habitable rooms
Built1930 to 1949
HeatingBoiler and radiators, mains gas
WallsSolid brick, as built, no insulation (assumed)

From the energy performance certificate lodged in January 2026, the latest held for this property, matched to this application by its address. The building may have changed since. View the certificate

Work with planning data?

Every application in Hertsmere - and every UK council - as a live feed, an API, or a bulk CSV export.

About Plota's data service

Important details

Council
Hertsmere
Application type
PD- Prior Approval 42 day (Hsehold ext)
Postcode
EN6 3PJ
Received
21 May 2026
Validated
21 May 2026
Ward
Shenley
Parish
The Parish Council South Mimms And Ridge
Case officer
Show
Target decision
2 Jul 2026
Decision
PD42 -Prior Approval Given
Decision date
17 Jul 2026
Decision level
Delegated Decision
Applicant
Show
Agent
Great Plans

How this decision compares

Decided in 57 days from validation, about the council's usual 55 days. Approved, as 86% of extensions here are.

70%decided within 8 weeks
86%approved
475decided in the last year

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

Consultation & key dates

Alt. reference
PP-14955081
Planning Portal ref
PP-14955081
Neighbours
17 Jul 2026
Consultation
3 Jun 2026
Comments by
25 Jun 2026
Statutory expiry
2 Jul 2026
Env. assessment
No
Hertsmere
Planning Authority Score
3.3/10
Poor
#225 of 296 councils
Relevant to this application:
Householder decisions

Hertsmere is slower than most councils at deciding householder applications, ranking #243 out of 296. 55% of applications have the time limit extended, above the 41% national average. Householder applications are slightly more likely to be approved here (94%) 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
Hertsmere decision statistics
Based on MHCLG data, the year to March 2026
93%
Overall approval rate
Above avg (87%) #57 of 296
94%
Householder approved
Above avg (90%) #108 of 296
49%
Decided in 8 weeks
Below avg (63%) #243 of 296
55%
Extended time limit
Above avg (41%) #249 of 296
84%
Minor dwellings approved
102 decided (1-9 homes)
75%
Major dwellings approved
8 decided (10+ homes)
89%
Change of use approved
27 decided
742
Total decisions
55 refused in the year to March 2026

Energy performance: Energy performance certificates from the Energy Performance of Buildings Register, Ministry of Housing, Communities and Local Government. Contains public sector information licensed under the Open Government Licence v3.0. © Crown copyright 2026.