24 Hawkshead Lane North Mymms AL9 7TB Data via plota.co.uk

6/2026/0700/HOUSE - HOUSEHOLDER APPLICATION Refused
Extensions & alterations

Proposal

Alteration and extension to roof with the insertion of a new rooflight. Garage conversion involving the replacement of garage door with window 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
20 Apr 2026
✗
Refused
15 Jun 2026
Appeal
Not lodged

Refused on 15 Jun 2026 · Delegated · Last checked 8 Sept 2026

Documents 10

Decision & officer reports 2

PDF Decision Notice_620260700HOUSE.pdf (133 kb) Document · 15 Jun 2026 View ↗ PDF Delegated Report_620260700HOUSE(1).pdf (193 kb) Document · 15 Jun 2026 View ↗

Plans & drawings 2

PDF LocationPlan.pdf (534 kb) Document · 20 Apr 2026 View ↗ PDF 053-PL-2025-A1-03 Proposed Garage Proposed Elevations and Section.pdf (336 kb) Document · 20 Apr 2026 View ↗

Other documents 6

PDF 6_2026_0700_HOUSE.pdf (177 kb) Document · 20 May 2026 View ↗ PDF Site Notice_620260700HOUSE.pdf (86 kb) Document · 20 May 2026 View ↗ PDF ApplicationFormRedacted.pdf (272 kb) Document · 20 Apr 2026 View ↗ PDF 053-PL-2025-A3-00.pdf (693 kb) Document · 20 Apr 2026 View ↗ PDF 053-PL-2025-A1-01.pdf (398 kb) Document · 20 Apr 2026 View ↗ PDF 53PL2025-A1-02.pdf (1232 kb) Document · 20 Apr 2026 View ↗

All documents on the council site ↗

Site constraints 5

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.
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
1 listed building within 150 m; Inside the North Mymms 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 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.

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

30 Jul 2026Pending

Royal Veterinary College Hawkshead Lane North Mymms AL9 7TA

Relocation of the Transfusion Medicine Vet Pod and associated parking, landscapi...

6/2026/1337/FULL

Nearby new applications

30 Jul 2026Pending

Royal Veterinary College Hawkshead Lane North Mymms AL9 7TA

Relocation of the Transfusion Medicine Vet Pod and associated parking, landscapi...

6/2026/1337/FULL

Important details

Council
Welwyn Hatfield
Application type
HOUSEHOLDER APPLICATION
Postcode
AL9 7TB
Received
20 Apr 2026
Validated
20 Apr 2026
Parish
North Mymms
Case officer
Show
Decision
Refused
Decision date
15 Jun 2026
Decision level
Delegated
Applicant
Show
Agent
Show

How this decision compares

Decided in 56 days from validation, about the council's usual 56 days. Refused, as 13% of extensions here are.

68%decided within 8 weeks
87%approved
636decided 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
11 Jun 2026

Historical activity at this location

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

This property

Previous applications at this address

2025 Withdrawn
Erection of first floor side and front extension
6/2025/1330/HOUSE
2025 Withdrawn
Erection of first floor side and front extension
6/2025/1330/HOUSE
Within ~100m

Nearby activity

2020 Approved
10 Hawkshead Lane North Mymms Hatfield AL9 7TB
Submission of details pursuant to condition 2 (landscaping) on planning permission 6/2020…
6/2020/3438/COND
2020 Approved
10 Hawkshead Lane North Mymms Hatfield AL9 7TB
Submission of details pursuant to condition 2 (landscaping) on planning permission 6/2020…
6/2020/3438/COND
2020 Approved
10 Hawkshead Lane Hatfield AL9 7TB
Variation of condition 5 (approved plans) on planning permission 6/2017/2346/MAJ
6/2020/2633/VAR
2020 Approved
10 Hawkshead Lane Hatfield AL9 7TB
Variation of condition 5 (approved plans) on planning permission 6/2017/2346/MAJ
6/2020/2633/VAR
2019 Approved
10 Hawkshead Lane North Mymms Hatfield AL9 7TB
Submission of details pursuant to condition 2 (Landscaping) on planning permission 6/2017…
6/2019/0497/COND
2017 Approved
10 Hawkshead Lane North Mymms Hatfield AL9 7TB
Subdivision of existing single dwelling into two dwellings and erection of two porches fo…
6/2017/2346/MAJ
2017 Approved
10 Hawkshead Lane North Mymms Hatfield AL9 7TB
Subdivision of existing single dwelling into two dwellings and erection of two porches fo…
6/2017/2346/FULL
2017 Approved
12 Hawkshead Lane North Mymms Hatfield AL9 7TB
Erection of a single storey rear extension with pitched roof adjoining existing extension…
6/2017/2127/HOUSE
2017 Approved
47 Hawkshead Lane North Mymms Hatfield AL9 7TD
Erection of orangery following demolition of existing conservatory
6/2017/1320/HOUSE
2017 Refused
10 Hawkshead Lane, North Mymms, Hatfield, AL9 7TB
Subdivision of existing single dwelling into two dwellings and erection of two porches fo…
6/2017/0420/FULL
2016 Approved
The Old Cottage, 10 Hawkshead Lane, North Mymms, Hatfield, AL9 7TB
Certificate of lawfulness for the retention of the Old Cottage as a self contained dwelli…
6/2016/0132/LAWE
2016 Approved
The Old Cottage, 10 Hawkshead Lane, North Mymms, Hatfield, AL9 7TB
Certificate of lawfulness for the retention of the Old Cottage as a self contained dwelli…
6/2016/0132/LAWE
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