18 Bell Lane Brookmans Park AL9 7AY Data via plota.co.uk

6/2026/1748/HOUSE - HOUSEHOLDER APPLICATION Under Consultation
Extensions & alterations

Proposal

Alterations and raising the ridge height to create a crown roof with front and rear dormer windows Data via plota.co.uk

Track application Save this application and get an email when its status or decision changes. Alerts nearby Get email alerts for new planning applications near this address.
View original council record ↗Last checked

Application progress

✓
Received
1 Oct 2026
✓
Validated
2 Oct 2026
Decision
Expected by 27 Nov 2026

Under consideration

No decision has been issued yet. Plota predicts a decision around 27 Nov 2026, from Welwyn Hatfield's recent extensions.

Comments are open until 9 Nov 2026

Comment on this application ↗

Documents 16

Statements & assessments 2

PDF 18 Bell Lane-Brookmans Park-AL9 7AY -- Supporting Planning Statement.pdf (2526 kb) Document · 1 Oct 2026 View ↗ PDF 18 Bell Lane-Brookmans Park-AL9 7AY -- Planning Flood Map-Zone 1.pdf (671 kb) Document · 1 Oct 2026 View ↗

Plans & drawings 12

PDF 024-100A - Site Location and Block Plans.pdf (352 kb) Document · 1 Oct 2026 View ↗ PDF 024-102A - Existing Roof Plan.pdf (509 kb) Document · 1 Oct 2026 View ↗ PDF 024-105A - Existing Sections.pdf (377 kb) Document · 1 Oct 2026 View ↗ PDF 024-103A - Existing Front and Rear Elevations.pdf (803 kb) Document · 1 Oct 2026 View ↗ PDF 024-104A - Existing Side Elevations.pdf (541 kb) Document · 1 Oct 2026 View ↗ PDF 024-101A - Existing Plans.pdf (518 kb) Document · 1 Oct 2026 View ↗ PDF 024-201A - Proposed Plans.pdf (520 kb) Document · 1 Oct 2026 View ↗ PDF 024-202A - Proposed Plans.pdf (373 kb) Document · 1 Oct 2026 View ↗ PDF 024-203A - Proposed Roof Plan.pdf (524 kb) Document · 1 Oct 2026 View ↗ PDF 024-206A - Proposed Sections.pdf (398 kb) Document · 1 Oct 2026 View ↗ PDF 024-205A - Proposed Side Elevations.pdf (544 kb) Document · 1 Oct 2026 View ↗ PDF 024-204A - Proposed Front and Rear Elevations.pdf (815 kb) Document · 1 Oct 2026 View ↗

Other documents 2

PDF Site Notice_620261748HOUSE.pdf (104 kb) Document · 14 Oct 2026 View ↗ PDF ApplicationFormRedacted.pdf (273 kb) Document · 1 Oct 2026 View ↗

All documents on the council site ↗

Site constraints 4

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 ↗
Also on the record
1 listed building within 150 m; Inside the Brookmans Park 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 13 October 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.

Sales history 1

Last sold for £1,100,000 in October 2023. Detached house, freehold.

27 October 2023£1,100,000

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

Building

Floor area180 m² (1,938 sq ft)
Energy ratingD (56 out of 100), could reach C
PropertyDetached house, 6 habitable rooms
Built1950 to 1966
HeatingBoiler and radiators, mains gas
WallsCavity wall, as built, no insulation (assumed)

From the energy performance certificate lodged in September 2023, the latest held for this property. The building may have changed since. View the certificate

Work with planning data?

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

About Plota's data service

Other new applications on this street

16 Oct 2026Pending

12-14 Bell Lane Brookmans Park AL9 7AY

Erection of one dwelling, with garage wing, external landscaping and associated ...

6/2026/1761/FULL
7 Sept 2026Pending

58 Bell Lane Brookmans Park AL9 7AY

Submission of details pursuant to condition number 5 (energy statement) on plann...

6/2026/1555/COND
18 Aug 2026Pending

Land North of 58 Bell Lane Brookmans Park AL9 7AY

Permission in principle for the erection of a single dwelling

6/2026/1448/PIP
5 Jun 2026Pending

Water Tower Bell Lane Brookmans Park AL9 7AY

Proposed demolition of existing water tower

6/2026/0992/FULL

Nearby new applications

16 Oct 2026Pending

12-14 Bell Lane Brookmans Park AL9 7AY

Erection of one dwelling, with garage wing, external landscaping and associated ...

6/2026/1761/FULL
23 Sept 2026Pending

White Lodge Farm The Bellbrook Bulls Lane Hatfield AL9 7AZ

Erection of proposed stable block and alteration to existing access road for the...

6/2026/1684/FULL
7 Sept 2026Pending

58 Bell Lane Brookmans Park AL9 7AY

Submission of details pursuant to condition number 5 (energy statement) on plann...

6/2026/1555/COND
18 Aug 2026Pending

Land North of 58 Bell Lane Brookmans Park AL9 7AY

Permission in principle for the erection of a single dwelling

6/2026/1448/PIP
6 Aug 2026Pending

53 Pine Grove Brookmans Park AL9 7BL

T1 Horse Chestnut 1m full crown reduction T2 Hornbeam 2m full crown reduction (c...

6/2026/1347/TPO
29 Jul 2026Pending

58 Bell Lane Brookmans Park AL9 7AY

Submission of details pursuant to Condition 3 (materials), 4 (refuse and recycli...

6/2026/1317/COND

Important details

Council
Welwyn Hatfield
Application type
HOUSEHOLDER APPLICATION
Postcode
AL9 7AY
Received
1 Oct 2026
Validated
2 Oct 2026
Parish
North Mymms
Case officer
Show
Decision level
Delegated
Applicant
Show
Agent
Show

Decision outlook

Day 26 of the 56-day target. Welwyn Hatfield usually decides extensions by day 56.

Day 2630 days to the 56-day target
68%decided within 8 weeks
88%approved
693decided in the last year

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

Consultation & key dates

Comments by
9 Nov 2026

Historical activity at this location

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

Within ~100m

Nearby activity

2024 Approved
20 Bell Lane Brookmans Park AL9 7AY
Erection of new detached dwelling with basement and installation of heat pump following t…
6/2024/2114/FULL
2024 Approved
32 Bell Lane Brookmans Park AL9 7AY
Erection of single storey rear extension following the demolition of existing extension a…
6/2024/1097/HOUSE
2024 Refused
20 Bell Lane Brookmans Park AL9 7AY
Erection of ground and first floor side extension, ground and first floor rear extension…
6/2024/0375/HOUSE
2023 Refused
20 Bell Lane Hatfield AL9 7AY
Erection of two storey rear and side extension with formation of basement plant room with…
6/2023/1575/HOUSE
2023 Refused
20 Bell Lane Hatfield AL9 7AY
Erection of two storey rear and side extension with formation of basement plant room with…
6/2023/1575/HOUSE
2023 Approved
38 Bell Lane Brookmans Park AL9 7AY
Erection of part first floor side extension, installation of rear dormer, four rooflights…
6/2023/0992/HOUSE
2023 Approved
38 Bell Lane Brookmans Park AL9 7AY
Erection of part first floor side extension, installation of rear dormer, four rooflights…
6/2023/0992/HOUSE
2022 Approved
16 Bell Lane Brookmans Park Hatfield AL9 7AY
Demolition of existing dwelling and construction of a two storey 3 bedroom dwelling
6/2022/1593/FULL
2022 Approved
16 Bell Lane Brookmans Park Hatfield AL9 7AY
Demolition of existing dwelling and construction of a two storey 3 bedroom dwelling
6/2022/1593/FULL
2020 Approved
50 Bell Lane Hatfield AL9 7AY
Erection of a single storey rear extension and increase of height of side garage
6/2020/3107/HOUSE
2020 Approved
50 Bell Lane Hatfield AL9 7AY
Erection of a single storey rear extension and increase of height of side garage
6/2020/3107/HOUSE
2020
50 Bell Lane Bell Bar Hatfield AL9 7AY
Erection of single storey rear extension
6/2020/1648/LAWP
2020
50 Bell Lane Bell Bar Hatfield AL9 7AY
Erection of single storey rear extension
6/2020/1648/LAWP
2020 Approved
50 Bell Lane Hatfield AL9 7AY
Erection of single storey rear extension
6/2020/0089/HOUSE
2020 Approved
50 Bell Lane Hatfield AL9 7AY
Erection of single storey rear extension
6/2020/0089/HOUSE
2016 Approved
38 Bell Lane, Brookmans Park, Hatfield, AL9 7AY
Erection of a single storey rear extension
6/2016/2381/HOUSE
2016 Approved
38 Bell Lane, Brookmans Park, Hatfield, AL9 7AY
Erection of a single storey rear extension
6/2016/2381/HOUSE
2016 Refused
38 Bell Lane, Brookmans Park, Hatfield, AL9 7AY
Erection of single storey rear extension
6/2016/1093/HOUSE
2016 Refused
38 Bell Lane, Brookmans Park, Hatfield, AL9 7AY
Erection of single storey rear extension
6/2016/1093/HOUSE
2024 Approved
20 Bell Lane Hatfield AL9 7AY
Certificate of lawfulness for the erection of a single storey rear extension, a single st…
6/2024/1056/LAWP
2024 Refused
32 Bell Lane Brookmans Park AL9 7AY
Prior approval for the erection of a single storey rear extension measuring 5m in depth…
6/2024/0668/PN8
2024 Approved
20 Bell Lane Brookmans Park AL9 7AY
Prior approval for single storey rear extension measuring 8m in depth, 4m in height and 3…
6/2024/0373/PN8
2024 Approved
32 Bell Lane Brookmans Park AL9 7AY
Certificate of lawfulness for hip to gable loft conversion with front rooflights and rear…
6/2024/0252/LAWP
2023 Refused
20 Bell Lane Brookmans Park AL9 7AY
Prior approval for the erection of a single storey rear extension measuring 8m in depth…
6/2023/2495/PN8
2023 Refused
20 Bell Lane Brookmans Park AL9 7AY
Prior approval for the erection of a single storey rear extension measuring 8m in depth…
6/2023/2495/PN8
Welwyn Hatfield
Planning Authority Score
2.1/10
Poor
#272 of 296 councils
Relevant to this application:
Householder decisions

Welwyn Hatfield is slower than most councils at deciding householder applications, ranking #224 out of 296. 50% of applications have the time limit extended, above the 41% national average. Householder applications are slightly less likely to be approved here (86%) 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
Welwyn Hatfield decision statistics
Based on MHCLG data, the year to March 2026
86%
Overall approval rate
Below avg (87%) #200 of 296
86%
Householder approved
Below avg (90%) #246 of 296
53%
Decided in 8 weeks
Below avg (63%) #224 of 296
50%
Extended time limit
Above avg (41%) #229 of 296
84%
Minor dwellings approved
63 decided (1-9 homes)
83%
Major dwellings approved
12 decided (10+ homes)
73%
Change of use approved
22 decided
633
Total decisions
87 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.