Planning Applications in AL9

Planning authority: Welwyn Hatfield Borough Council

See all 2,791 planning applications in the AL9 postcode district since 2016, 49 in the last 90 days. Search and filter them by date, status, development type or number of homes, see the latest on the map, or get a free alert for new applications.

Date received
Get alerts for AL9

Filter applications

Date receivedLast 90 days
Date receivedLast 90 days
Select one year, or two for a range.
Number of homesAny
StatusAny
Application routeAny
Application typeAny
KeywordsNone
Match

Matches words or phrases in the application address and description.

Showing 49 of 49 applications
21 Oct 2026 Approved 23 Oct 6/2026/1892/TPO

Bedwell End School Lane Essendon Herts AL9 6HL

To fell a dangerous tree diagnosed with Sycamore Anthracnose leaning towards garage (TPO3 W4)

WORKS TO TREES WITH TREE PRESERVATION ORDER Welwyn Hatfield
16 Oct 2026 Under Consultation 6/2026/1761/FULL

12-14 Bell Lane Brookmans Park AL9 7AY

Erection of one dwelling, with garage wing, external landscaping and associated works following demolition of existing dwelling and outbuildings

FULL PERMISSION Welwyn Hatfield
7 Oct 2026 Under Consultation 6/2026/1784/FULL

Colonial House 87 Great North Road AL9 5DA

Replacement bin store

FULL PERMISSION Welwyn Hatfield
2 Oct 2026 Under Consultation 6/2026/1748/HOUSE

18 Bell Lane Brookmans Park AL9 7AY

Alterations and raising the ridge height to create a crown roof with front and rear dormer windows

HOUSEHOLDER APPLICATION Welwyn Hatfield
1 Oct 2026 Under Consultation 6/2026/1731/HOUSE

Lakeside Manor West End Lane Essendon Hatfield AL9 6AZ

Erection of a basement extension, fenestration alteration and wall and roof replacement

HOUSEHOLDER APPLICATION Welwyn Hatfield
1 Oct 2026 Under Consultation 6/2026/1678/HOUSE

Sunnyside Essendon Hill Essendon Hatfield AL9 6AJ

Installation of front dormer and insertion of bi folding doors to rear

HOUSEHOLDER APPLICATION Welwyn Hatfield
1 Oct 2026 Under Consultation 6/2026/1735/MAJ

Royal Veterinary College Hawkshead Lane North Mymms AL9 7TA

Erection of a small animals teaching hospital (Use Class F1), together with associated parking, landscaping, servicing, plant and associated works fol...

MAJOR DEVELOPMENT Welwyn Hatfield
30 Sept 2026 Under Consultation 6/2026/1723/PN24

Bays 1-2 Travellers Lane Welham Green Hatfield AL9 7EX

Prior approval for the installation of 2051 solar panels to the roof of the building and associated electrical works

Solar Panels/PV - PRIOR APPROVAL Welwyn Hatfield
30 Sept 2026 Approved 7 Oct 6/2026/1727/TC

The Manor House Essendon Hill Essendon Hatfield AL9 6AJ

Fell Birch Tree (5 day notice)

TREES IN CONSERVATION AREA Welwyn Hatfield
24 Sept 2026 Under Consultation 6/2026/1649/FULL

17A The Broadway Hatfield AL9 5HZ

Erection of canopy

FULL PERMISSION Welwyn Hatfield
23 Sept 2026 Under Consultation 6/2026/1684/FULL

White Lodge Farm The Bellbrook Bulls Lane Hatfield AL9 7AZ

Erection of proposed stable block and alteration to existing access road for the use of land for keeping horses for personal leisure use.

FULL PERMISSION Welwyn Hatfield
22 Sept 2026 Under Consultation 6/2026/1596/HOUSE

39 Station Road Welham Green Hatfield AL9 7PF

Erection of first floor side extension and timber cladding and rendering to existing front elevation

HOUSEHOLDER APPLICATION Welwyn Hatfield
22 Sept 2026 Under Consideration 6/2026/1675/HOUSE

20 Moffats Lane Brookmans Park AL9 7RU

Erection of garden room to rear elevation

HOUSEHOLDER APPLICATION Welwyn Hatfield
21 Sept 2026 Under Consultation 6/2026/1632/FULL

19 Pine Grove Brookmans Park AL9 7BP

Erection of dwelling following the demolition of existing dwelling

FULL PERMISSION Welwyn Hatfield
21 Sept 2026 Under Consultation 6/2026/1646/LB

Hatfield House Hatfield Park Great North Road Hatfield AL9 5NF

Roof repairs and ancillary works associated with the Grade I Listed Hatfield House

LISTED BUILDING Welwyn Hatfield
17 Sept 2026 Under Consideration 6/2026/1629/TC

Horse And Groom 21 Park Street Hatfield AL9 5AT

1 x Ash to lift to 5m above ground level. Reduce lateral branches by 1.5m height & width

TREES IN CONSERVATION AREA Welwyn Hatfield
17 Sept 2026 Approved 22 Oct 6/2026/1616/TPO

HMWT Gobions Wood Nature Reserve Off Mymms Drive Potters Bar AL9 7AF

Mature Ash tag 895 with multiple cavities and evidence of long term Inonotus hispidus decay with multiple fruiting bodies on stem and around the tree ...

WORKS TO TREES WITH TREE PRESERVATION ORDER Welwyn Hatfield
16 Sept 2026 Under Consideration 6/2026/1609/TPO

Northfield Woodfield Lane Hatfield AL9 6JJ

TPO3 G62 T1 – Oak – height 20m – spread 16m – Living, but dying crown - Tree to be pollarded - the pollard framework new height will be approx. 18m

WORKS TO TREES WITH TREE PRESERVATION ORDER Welwyn Hatfield
16 Sept 2026 Approved 1 Oct 6/2026/1537/COND

Land south of Welham Manor and west of Station Road, including 26 Station Road Welham Green AL9 7EL

Submission of details pursuant to Condition 15 (Fire Hydrants) on planning permission 6/2024/2418/MAJ

APPROVAL OF DETAILS RESERVED BY CONDITION Welwyn Hatfield
14 Sept 2026 Under Consultation 6/2026/1550/FULL

73 Mymms Drive Brookmans Park AL9 7AA

Erection of dwelling following demolition of existing dwelling

FULL PERMISSION Welwyn Hatfield
11 Sept 2026 Under Consideration 6/2026/1576/HOUSE

28 Peplins Way Brookmans Park AL9 7UU

Erection of two-storey front and side extension, single-storey rear extension and a flat roof incorporating a glazed rooflight

HOUSEHOLDER APPLICATION Welwyn Hatfield
11 Sept 2026 Under Consideration 6/2026/1592/HOUSE

3 Lysley Place Brookmans Park AL9 6NZ

Erection of front porch canopy

HOUSEHOLDER APPLICATION Welwyn Hatfield
9 Sept 2026 Approved 19 Oct 6/2026/1572/COND

83 Brookmans Avenue Brookmans Park AL9 7QG

Submission of details pursuant to condition number 1 (Demolition and Construction Management Plan) on planning permission 6/2026/0138/FULL

APPROVAL OF DETAILS RESERVED BY CONDITION Welwyn Hatfield
8 Sept 2026 Approved 23 Oct 6/2026/1559/LAWP

28 Pleasant Rise Hatfield AL9 5DU

Certificate of lawfulness for construction of a new detached, single-storey garden room/summerhouse within an existing rear garden

LAWFUL DEVELOPMENT - PROPOSED Welwyn Hatfield
7 Sept 2026 Under Consideration 6/2026/1378/FULL

1 Meadow Close Welham Green Hatfield AL9 7NZ

Enclosing existing amenity land with a 1.5m fence on 0.3m gravel boards

FULL PERMISSION Welwyn Hatfield
7 Sept 2026 Under Consideration 6/2026/1555/COND

58 Bell Lane Brookmans Park AL9 7AY

Submission of details pursuant to condition number 5 (energy statement) on planning permission 6/2025/2133/FULL

APPROVAL OF DETAILS RESERVED BY CONDITION Welwyn Hatfield
3 Sept 2026 Under Consultation 6/2026/1538/TPO

Chine House Wild Hill Hatfield AL9 6EB

Ground works and associated root pruning/ severance of T3 (Oak) and other trees not advised to be the subject of a TPO to facilitate installation of a...

WORKS TO TREES WITH TREE PRESERVATION ORDER Welwyn Hatfield
2 Sept 2026 Under Consideration 6/2026/1533/ADV

37-39 Bradmore Green Brookmans Park AL9 7QR

Remove old signage & replace with new

ADVERT CONSENT Welwyn Hatfield
26 Aug 2026 Under Consideration 6/2026/1502/HOUSE

143 The Ryde Hatfield AL9 5DP

Erection of single storey rear extension with raising of roof to existing extension, and alterations to openings to rear and side elevations

HOUSEHOLDER APPLICATION Welwyn Hatfield
26 Aug 2026 Under Consideration 6/2026/1022/VAR

91 The Ryde Hatfield AL9 5DN

Variation of condition 2 (approved plans) on planning permission 6/2025/1670/HOUSE

VARIATION OF CONDITION Welwyn Hatfield
26 Aug 2026 Approved 20 Oct 6/2026/1503/LAWE

27 Batterdale Hatfield AL9 5JG

Certificate of lawfulness for the existing like-for-like replacement of damaged and aged windows on the front and rear elevations

LAWFUL DEVELOPMENT - EXISTING Welwyn Hatfield
24 Aug 2026 Approved 18 Sep 6/2026/1478/COND

27 The Grove Brookmans Park AL9 7RL

Submission of details pursuant to Condition 1 (details of external render) and Condition 2 (details of windows and doors) on planning permission 6/202...

APPROVAL OF DETAILS RESERVED BY CONDITION Welwyn Hatfield
21 Aug 2026 Approved 16 Oct 6/2026/1477/HOUSE

4 Brookmans Avenue Brookmans Park AL9 7QJ

Retention of single storey timber structure as gym and addition of storm porch

HOUSEHOLDER APPLICATION Welwyn Hatfield
21 Aug 2026 Approved 12 Oct 6/2026/1473/COND

38 The Grove Brookmans Park AL9 7RN

Submission of details pursuant to Condition 2 (boundary treatments) on planning permission 6/2025/0285/HOUSE

APPROVAL OF DETAILS RESERVED BY CONDITION Welwyn Hatfield
20 Aug 2026 Call In/Major Objection 6/2026/0570/FULL

Thunderbridge Yard Bulls Lane Hatfield AL9 7BB

Change of use of land to enable the formation of 4 Gypsy/Traveller pitches (comprising the stationing of 1 static caravan and storage of 1 touring car...

FULL PERMISSION Welwyn Hatfield
18 Aug 2026 Under Consideration 6/2026/1449/COND

4 Brookmans Avenue Brookmans Park AL9 7QJ

Submission of details pursuant to Condition 4 (landscaping) on planning permission 6/2023/0622/FULL

APPROVAL OF DETAILS RESERVED BY CONDITION Welwyn Hatfield
18 Aug 2026 Under Consultation 6/2026/1448/PIP

Land North of 58 Bell Lane Brookmans Park AL9 7AY

Permission in principle for the erection of a single dwelling

PERMISSION IN PRINCIPLE Welwyn Hatfield
13 Aug 2026 Under Consideration 6/2026/1428/HOUSE

7 Pleasant Rise Hatfield AL9 5DR

Erection of single storey rear garage extension

HOUSEHOLDER APPLICATION Welwyn Hatfield
12 Aug 2026 Call In/Major Objection 6/2026/1421/FULL

Thunderbridge Farm Bulls Lane Hatfield AL9 7BB

Erection of an agricultural building.

FULL PERMISSION Welwyn Hatfield
12 Aug 2026 Approved 20 Oct 6/2026/1417/HOUSE

15 Ramsey Close Brookmans Park AL9 6NP

Erection of single storey side and first floor rear extensions, front porch extension, door and fenestration alterations to rear elevation, new front ...

HOUSEHOLDER APPLICATION Welwyn Hatfield
11 Aug 2026 Approved 5 Oct 6/2026/1408/HOUSE

Wytmead Essendon Hill Essendon Hatfield AL9 6AW

Reinstatement of the previously truncated chimney

HOUSEHOLDER APPLICATION Welwyn Hatfield
11 Aug 2026 Under Consideration 6/2026/1407/FULL

11 Georges Wood Road Brookmans Park AL9 7BY

Erection of new dwelling and associated hard and soft landscaping following demolition of the existing dwelling and the detached garage.

FULL PERMISSION Welwyn Hatfield
11 Aug 2026 Approved 16 Sep 6/2026/1406/COND

Bothys Field Holwell Court Farm

Submission of details pursuant to condition 1 (Biodiversity Net Gain Plan) and condition 2 (Landscape and Ecology Management Plan) on planning applica...

APPROVAL OF DETAILS RESERVED BY CONDITION Welwyn Hatfield
7 Aug 2026 Approved 30 Sep 6/2026/1402/COND

Wytmead Essendon Hill Essendon Hatfield AL9 6AW

Submission of details pursuant to Condition 1 (samples of the roof tiles) and condition 3 (rooflights) on listed building consent 6/2026/0690/LB

APPROVAL OF DETAILS RESERVED BY CONDITION Welwyn Hatfield
7 Aug 2026 Approved 1 Oct 6/2026/1264/FULL

53 Brookmans Avenue Brookmans Park AL9 7QG

Erection of dwelling with boundary wall and gates following demolition of existing property

FULL PERMISSION Welwyn Hatfield
6 Aug 2026 Under Consideration 6/2026/1347/TPO

53 Pine Grove Brookmans Park AL9 7BL

T1 Horse Chestnut 1m full crown reduction T2 Hornbeam 2m full crown reduction (covered by TPO468, TPO1054 (2023) &TPO981)

WORKS TO TREES WITH TREE PRESERVATION ORDER Welwyn Hatfield
5 Aug 2026 Approved 3 Sep 6/2026/1263/COND

Land south of Welham Manor and west of Station Road, including 26 Station Road Welham Green AL9 7EL

Submission of details pursuant to Condition 24 (External Lighting) on planning permission 6/2024/2418/MAJ

APPROVAL OF DETAILS RESERVED BY CONDITION Welwyn Hatfield
3 Aug 2026 Refused 11 Sep 6/2026/1335/PN8

31 Kentish Lane Brookmans Park AL9 6NG

Prior approval for 2x single storey rear extensions and 1x single storey side/rear extension measuring 8m in depth, 2.85m to the eaves and the maximum...

Class A – enlargement, improvement or other alteration of a dwellinghouse - PRIOR APPROVAL Welwyn Hatfield
3 Aug 2026 Approved 28 Sep 6/2026/1337/FULL

Royal Veterinary College Hawkshead Lane North Mymms AL9 7TA

Relocation of the Transfusion Medicine Vet Pod and associated parking, landscaping and associated works

FULL PERMISSION Welwyn Hatfield
Recency
Last 2 weeks
2-4 weeks
1-2 months
Older

Get free email alerts for new planning applications in the AL9 area

Data updated daily. Source: Welwyn Hatfield Borough Council planning portal.