20 Castle Hill Avenue Berkhamsted Hertfordshire HP4 1HJ Data via plota.co.uk

26/02224/NMA - Non-Material Amendment Approved
Admin / procedural

Proposal

Non material amendment attached to planning permission 25/01665/FHA Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
12 Oct 2026
✓
Approved
22 Oct 2026

Approved on 22 Oct 2026 · Delegated · Last checked 23 Oct 2026

Documents 6

Decision & officer reports 2

PDF Nma - grant (decision notice) Decision Notice · 22 Oct 2026 View ↗ PDF Upload delegated report Delegated Report · 22 Oct 2026 View ↗

Plans & drawings 3

PDF Proposed elevations 2 Proposed Elevations · 9 Oct 2026 View ↗ PDF Proposed elevations 1 Proposed Elevations · 9 Oct 2026 View ↗ PDF Proposed roof plan Proposed Plans · 9 Oct 2026 View ↗

Application forms 1

PDF Applicationformredacted Application Form Redacted · 9 Oct 2026 View ↗

All documents on the council site ↗

Associated applications 2

Site constraints 4

Also on the record
National landscape 160 m away: Chilterns; Scheduled monument 176 m away: Berkhamsted motte and bailey castle; Radon affected area, class 3; Inside the Berkhamsted built-up area.
Not affected
Outside flood zones 2 and 3 · Not green belt · No listed building at the site

Checked on 14 October 2026. 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.

Sales history 1

Last sold for £1,075,000 in May 2023. Detached house, freehold.

31 May 2023£1,075,000

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

Building

Floor area110 m² (1,184 sq ft)
Energy ratingC (70 out of 100), could reach B
PropertyDetached house, 7 habitable rooms
Built1950 to 1966
HeatingBoiler and radiators, mains gas
WallsCavity wall, filled cavity

From the energy performance certificate lodged in November 2022, the latest held for this property. The building may have changed since. View the certificate

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Important details

Council
Dacorum
Application type
Non-Material Amendment
Postcode
HP4 1HJ
Received
12 Oct 2026
Validated
12 Oct 2026
Ward
Berkhamsted Castle
Parish
Berkhamsted Town Council
Case officer
Show
Decision
Grant Permission/Consent
Decision date
22 Oct 2026
Decision level
Delegated
Applicant
Show
Agent
Blackwood Architects Ltd

Public comments

No public comments yet.

Last counted 23 Oct 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-15286596
Planning Portal ref
PP-15286596
Env. assessment
No

Historical activity at this location

27 previous applications on record - archival context, not part of the live application.

This property

Previous applications at this address

2025 Approved
Two storey front, side and rear extension. Roof extensions. New front bay window and porc…
25/01665/FHA
2025 Approved
Two storey front, side and rear extension. Roof extensions. New front bay window and porc…
25/01665/FHA
Within ~100m

Nearby activity

2025 Refused
Plot Adjacent To 22 Castle Hill Avenue Berkhamsted Hertfordshire HP4 1HJ
Construction of a self-build dwelling
25/01365/FUL
2025 Refused
Plot Adjacent To 22 Castle Hill Avenue Berkhamsted Hertfordshire HP4 1HJ
Construction of a self-build dwelling
25/01365/FUL
2025 Withdrawn
Castle Hill Avenue Berkhamsted Hertfordshire
Works to trees in Castle Hill Avenue
25/01380/TPO
2025 Withdrawn
Castle Hill Avenue Berkhamsted Hertfordshire
Works to trees in Castle Hill Avenue
25/01380/TPO
2024 Withdrawn
Plot Adjacent To 22 Castle Hill Avenue Berkhamsted Hertfordshire HP4 1HJ
Construction of a self-build dwelling
24/02910/FUL
2024 Approved
17 Castle Hill Berkhamsted Hertfordshire HP4 1HE
Proposed new side windows and door. Removal of existing side door.
24/01399/LDP
2024 Approved
34 Castle Hill Avenue Berkhamsted Hertfordshire HP4 1HJ
Two new rooflights - front and side. New landing window on side elevation. Alterations to…
24/00925/FHA
2023 Approved
16 Castle Hill Avenue Berkhamsted Hertfordshire HP4 1HJ
Two storey rear extension, single storey side extension, new dormers to front and replace…
23/02904/FHA
2023 Approved
16 Castle Hill Avenue Berkhamsted Hertfordshire HP4 1HJ
Two storey rear extension, single storey side extension, new dormers to front and replace…
23/02904/FHA
2023 Approved
22 Castle Hill Avenue Berkhamsted Hertfordshire HP4 1HJ
First floor side extension. Insertion of one side velux and one rear dormer, and one fron…
23/02519/FHA
2023 Approved
22 Castle Hill Avenue Berkhamsted Hertfordshire HP4 1HJ
First floor side extension. Insertion of one side velux and one rear dormer, and one fron…
23/02519/FHA
2023 Approved
19 Castle Hill Berkhamsted Hertfordshire HP4 1HE
Works to tree.
23/02082/TPO
2023 Approved
19 Castle Hill Berkhamsted Hertfordshire HP4 1HE
Works to tree.
23/02082/TPO
2023 Approved
22 Castle Hill Avenue Berkhamsted Hertfordshire HP4 1HJ
First floor side extension. Insertion of one side dormer and one rear dormer, and one fro…
23/00234/FHA
2023 Approved
22 Castle Hill Avenue Berkhamsted Hertfordshire HP4 1HJ
First floor side extension. Insertion of one side dormer and one rear dormer, and one fro…
23/00234/FHA
2022 Approved
26 Bridgewater Road Berkhamsted Hertfordshire HP4 1HN
Proposed single storey front porch extensions, ground and 1st floor side extensions and 1…
22/01816/FHA
2022 Approved
26 Bridgewater Road Berkhamsted Hertfordshire HP4 1HN
Proposed single storey front porch extensions, ground and 1st floor side extensions and 1…
22/01816/FHA
2022 Approved
18 Castle Hill Avenue Berkhamsted Hertfordshire HP4 1HJ
Single storey front and rear extensions, 1st floor side extensions and loft conversion wi…
22/01260/FHA
2022 Approved
18 Castle Hill Avenue Berkhamsted Hertfordshire HP4 1HJ
Single storey front and rear extensions, 1st floor side extensions and loft conversion wi…
22/01260/FHA
2022 Refused
22 Castle Hill Avenue Berkhamsted Hertfordshire HP4 1HJ
First floor side extension and loft conversions including two new front velux windows, si…
22/00905/FHA
2016 Approved
9 Castle Hill Avenue Berkhamsted HP4 1HJ
Gable raise, rear dormer, rooflights to front elevation
4/02253/16/LDP
2016 Approved
14 Bridgewater Road Berkhamsted HP4 1HN
Summerhouse/shed
4/00857/16/LDP
2016 Approved
14 Bridgewater Road Berkhamsted HP4 1HN
Summerhouse/shed
4/00857/16/LDP
2016 Approved
18 Castle Hill Avenue Berkhamsted HP4 1HJ
Single storey front extension, two storey rear extension and garage Conversion.
4/00904/16/FHA
2016 Approved
18 Castle Hill Avenue Berkhamsted HP4 1HJ
Single storey front extension, two storey rear extension and garage Conversion.
4/00904/16/FHA
Dacorum
Planning Authority Score
7.3/10
Good
#51 of 296 councils
Relevant to this application:
Householder decisions

Dacorum is faster than most councils at deciding householder applications, ranking #50 out of 296. Only 22% of applications have the time limit extended, well below the 41% national average - the council usually decides on time. Householder applications are slightly more likely to be approved here (91%) than the national average (90%).

Faster than most councils
for householder decisions
These figures are council-wide context, not a prediction for this application. View full council performance
Dacorum decision statistics
Based on MHCLG data, the year to March 2026
88%
Overall approval rate
Above avg (87%) #150 of 296
91%
Householder approved
Above avg (90%) #171 of 296
78%
Decided in 8 weeks
Above avg (63%) #50 of 296
22%
Extended time limit
Below avg (41%) #22 of 296
76%
Minor dwellings approved
127 decided (1-9 homes)
79%
Major dwellings approved
14 decided (10+ homes)
71%
Change of use approved
21 decided
1,130
Total decisions
132 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.

Freehold boundary: © Crown copyright and database rights 2026, HM Land Registry. Polygons © Crown copyright and database rights 2026 Ordnance Survey 100026316. Conditions of use

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.