18 Kemprow Aldenham Watford Hertfordshire WD25 8BP Data via plota.co.uk
26/1077/HSE - Householder Application
Awaiting decision
Proposal
Single story rear extension, erection of a new porch, new raised roof incorporating conversion of loft to habitable space with front dormer and 5x roof lights,and associated external works. Data via plota.co.uk
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View original council record ↗Last checked
Application progress
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Received
31 Jul 2026
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Consultation
19 Aug 2026
Decision
Expected by 25 Sept 2026
This application is under consideration - no decision has been issued yet. Plota predicts a decision around 24 Sept 2026, from Hertsmere's recent extensions. The consultation period closed on 9 Sept 2026.
Documents 13
Plans & drawings 12
PDF
Location plan
Drawing/Plans · 31 Jul 2026
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PDF
18kp/lp01 Location plan
Drawing/Plans · 31 Jul 2026
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PDF
18kp/ex-01 Existing site plan
Drawing/Plans · 31 Jul 2026
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18kp/ex-02 Existing ground floor plan
Drawing/Plans · 31 Jul 2026
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PDF
18kp/ex-03 Existing roof plan
Drawing/Plans · 31 Jul 2026
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PDF
18kp/ex-04 Existing elevations
Drawing/Plans · 31 Jul 2026
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PDF
18kp/200 Proposed site plan
Drawing/Plans · 31 Jul 2026
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PDF
18kp/201 Proposed ground floor plan
Drawing/Plans · 31 Jul 2026
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PDF
18kp/202 Proposed loft plan
Drawing/Plans · 31 Jul 2026
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PDF
18kp/203 Proposed roof plan
Drawing/Plans · 31 Jul 2026
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PDF
18kp/204 Proposed elevations
Drawing/Plans · 31 Jul 2026
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PDF
18kp/205 Proposed street scene
Drawing/Plans · 31 Jul 2026
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Application forms 1
Site constraints 3
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.
Also on the record
Inside the Aldenham built-up area; the 1970s provisional farmland map 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 listed building at the site · No scheduled monument at the site
Checked on 11 September 2026. 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.
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Important details
Decision outlook
Day 45 of the 56-day target. Hertsmere usually decides extensions by day 55.
Day 4511 days to the 56-day target
66%decided within 8 weeks
83%approved
393decided in the last year
Plota live figures for extensions decided by Hertsmere in the last twelve months, from validation. Hertsmere decision record →
Public comments
No public comments yet.
6 neighbours consulted · Last counted 12 Sept 2026
Consultation & key dates
- Alt. reference
- PP-15108396
- Neighbours
- 13 Aug 2026
- Consultation
- 19 Aug 2026
- Comments by
- 9 Sept 2026
- Statutory expiry
- 25 Sept 2026
- Env. assessment
- No
Historical activity at this location
25 nearby applications on record - archival context, not part of the live application.
Within ~100m
Nearby activity
2021
Approved
High Cross Garage High Cross Aldenham Watford Hertfordshire WD25 8BN
Demolition of commercial workshop premises and construction of a new detached 4-bed dwell…
2021
Approved
High Cross Garage High Cross Aldenham Watford Hertfordshire WD25 8BN
Demolition of commercial workshop premises and construction of a new detached 4-bed dwell…
2021
Refused
High Cross Garage High Cross Aldenham Watford Hertfordshire WD25 8BN
Demolition of commercial workshop premises and construction of a new detached 4-bed dwell…
2020
Refused
High Cross Garage High Cross Aldenham Watford Hertfordshire WD25 8BN
Demolition of commercial workshop premises and construction of a new detached 4-bed dwell…
2020
Refused
High Cross Garage High Cross Aldenham Watford Hertfordshire WD25 8BN
Demolition of commercial workshop premises and construction of a new detached 4-bed dwell…
2019
Refused
High Cross Garage High Cross Aldenham Watford Hertfordshire WD25 8BN
Demolition of commercial workshop premises and construction of a new detached 4-bed dwell…
2019
Approved
20 Kemprow Aldenham Watford Hertfordshire WD25 8BP
Installation of dormers to side elevations and balcony to rear elevation.
2019
Approved
6 Kemprow Aldenham Watford Hertfordshire WD25 8BP
Erection of first floor rear extension.
2019
Approved
16 Kemprow Aldenham Watford Hertfordshire WD25 8BP
Single Storey rear extension Depth: 8m Height: 3m Eaves: 2.6m
2018
Approved
The White House High Cross Aldenham Watford Hertfordshire WD25 8BN
Installation of entrance gates - retrospective application
2018
Approved
6 Kemprow Aldenham Watford Hertfordshire WD25 8BP
Single storey rear extension Depth: 6m Height: 4m Eaves: 3m
2018
Refused
Kemprow High Cross Aldenham Watford Hertfordshire
Amendments to front entrance wall and gate design and increase in height of approved bin/…
2018
Approved
Kemprow High Cross Aldenham Watford Hertfordshire
Erection of front boundary wall and associated brick piers with front entrance gate (amen…
2017
Refused
High Cross Garage High Cross Aldenham Watford Hertfordshire WD25 8BN
Demolition of existing building and construction of 3 x 2 bed terrace dwellings with asso…
2017
Withdrawn
16 Kemprow Aldenham Watford Hertfordshire WD25 8BP
Erection of new front porch; Two storey side extension and single storey rear extension i…
2016
Approved
Kemprow High Cross Aldenham Watford Hertfordshire
Demolition of existing sheds and construction of detached 2 storey, 4 bed dwelling utilis…
2016
Approved
Kemprow High Cross Aldenham Watford Hertfordshire
Demolition of existing sheds and construction of detached 2 storey, 4 bed dwelling utilis…
2016
Approved
8 Kemprow Aldenham Watford Hertfordshire WD25 8BP
First floor rear extension incorporating Juliet balcony
2016
Approved
8 Kemprow Aldenham Watford Hertfordshire WD25 8BP
First floor rear extension incorporating Juliet balcony
2016
Refused
Kemprow High Cross Aldenham Watford Hertfordshire
Construction of detached, 2 storey, 4 bed dwelling. (Amended Description).
2023
Approved
High Cross Garage High Cross Aldenham Watford Hertfordshire WD25 8BN
Application for variation of condition 2 (plans) to allow for the omission of the chimney…
2023
Approved
High Cross Garage High Cross Aldenham Watford Hertfordshire WD25 8BN
Application for variation of condition 2 (plans) to allow for the omission of the chimney…
2022
Approved
High Cross Garage High Cross Aldenham Watford Hertfordshire WD25 8BN
Application for approval of details reserved by conditions 3 (materials), 4 (walls, fence…
2022
Approved
High Cross Garage High Cross Aldenham Watford Hertfordshire WD25 8BN
Application for approval of details reserved by conditions 3 (materials), 4 (walls, fence…
2018
Approved
Kemprow High Cross Aldenham Watford Hertfordshire
Application for variation of condition 10 to delay the requirement for a fire hydrant fol…
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
Track this application
18 Kemprow Aldenham Watford Hertfordshire WD25 8BP
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