40 Dellsome Lane Welham Green Hatfield AL9 7ND Data via plota.co.uk
Proposal
Certificate of lawfulness for Class A - Larger single storey rear extension (previously subject to prior approval application ref: ), Class B - Roof extension/hip to gable conversion, Class C - Other alterations to roof Data via plota.co.uk
Application progress
This application is under consideration - no decision has been issued yet. Plota predicted a decision around 14 Sept 2026; it is now day 59.
Documents 9
Plans & drawings 7
Site constraints 2
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.
Every application in Welwyn Hatfield - and every UK council - as a live feed, an API, or a bulk CSV export.
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Important details
- Council
- Welwyn Hatfield
- Application type
- LAWFUL DEVELOPMENT - PROPOSED
- Postcode
- AL9 7ND
- Received
- 16 Jul 2026
- Validated
- 17 Jul 2026
- Parish
- North Mymms
- Case officer
- Show
- Decision level
- Delegated
- Applicant
- Show
- Agent
- Show
Decision outlook
Day 59, past the statutory target. 92% of extensions in Welwyn Hatfield are decided within thirteen weeks, which runs to 16 Oct 2026; extensions of time are common, and the council need not decide on the day. Last seen undecided on 7 Sept 2026.
Plota live figures for extensions decided by Welwyn Hatfield in the last twelve months, from validation. Welwyn Hatfield decision record →
Historical activity at this location
21 previous applications on record - archival context, not part of the live application.
Previous applications at this address
Nearby activity
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%).
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40 Dellsome Lane Welham Green Hatfield AL9 7ND
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Referenced application