Planning Applications in Welwyn, Hertfordshire

Planning authority: Welwyn Hatfield Borough Council

Search current and historic planning applications in Welwyn, Hertfordshire, published by Welwyn Hatfield Borough Council - 41 in the last 90 days. Explore them on the map, apply detailed filters, or receive free alerts for new proposals.

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Showing 41 of 41 applications
1 Sept 2026 Under Consultation 6/2026/1526/HOUSE

32 Turpins Chase Welwyn AL6 0RR

Erection of a single storey side extension and a new garage on ground floor level, conversion of the existing garage and installation of an air source...

HOUSEHOLDER APPLICATION Welwyn Hatfield
27 Aug 2026 Under Consideration 6/2026/1514/TPO

6A Wendover Drive Welwyn AL6 9LT

T1 1 x Beech to remove in sections to ground level - Tree is almost dead and in poor condition T2 1 x Beech to reduce to clear property by 1.5m - Bran...

WORKS TO TREES WITH TREE PRESERVATION ORDER Welwyn Hatfield
27 Aug 2026 Refused 6/2026/1441/FULL

22 The Avenue Welwyn AL6 0PP

Erection of one two-storey five bedroom detached dwelling and eight two bedroom flats laid out within two two storey blocks of four and associated inf...

FULL PERMISSION Welwyn Hatfield
20 Aug 2026 Pending 6/2026/1470/TPO

Glebe House Ellesfield Welwyn AL6 9HB

TPO 1016 1 x White Poplar to reduce upper canopy by approximately 10m height - Reduce upper canopy due to large volume of regrowth from historical red...

WORKS TO TREES WITH TREE PRESERVATION ORDER Welwyn Hatfield
19 Aug 2026 Under Consultation 6/2026/1431/FULL

Lodge Farm 124 Harmer Green Lane Digswell Welwyn AL6 0ET

Erection of four 4-bedroom detached dwellings with associated landscaping and parking, following the demolition of the existing stable building

FULL PERMISSION Welwyn Hatfield
19 Aug 2026 Pending 6/2026/1467/LB

3 Holly Hall Court Church Street Welwyn AL6 9LH

Replacement like-for-like front door and one window

LISTED BUILDING Welwyn Hatfield
19 Aug 2026 Pending 6/2026/1466/HOUSE

36 Warren Way Digswell Welwyn AL6 0DN

Erection of two storey side extension, part single/two storey rear extension, insertion of two front dormer windows and front porch following the demo...

HOUSEHOLDER APPLICATION Welwyn Hatfield
18 Aug 2026 Under Consultation 6/2026/1440/TPO

10 Mardley Heights Welwyn AL6 0TX

4 x English Oak (Quercus robur), identified as T1, T2, T3 and T4 on the accompanying sketch plan, protected under TPO 641 (2017). Proposed works: Crow...

WORKS TO TREES WITH TREE PRESERVATION ORDER Welwyn Hatfield
18 Aug 2026 Pending 6/2026/1456/HOUSE

8 The Limberlost Welwyn AL6 9TS

Erection of single storey side extension and front porch canopy

HOUSEHOLDER APPLICATION Welwyn Hatfield
14 Aug 2026 Under Consultation 6/2026/1436/FULL

8 Robbery Bottom Lane Welwyn AL6 0UW

Erection of two 2-bed chalet bungalows (Use Class C3) following the subdivision of existing residential plot

FULL PERMISSION Welwyn Hatfield
14 Aug 2026 Under Consultation 6/2026/1432/TPO

1 Oaklands View Welwyn AL6 0RJ

TPO 203 & 879 - T1- Sweet chestnut tree to reduce all round by 2-3 metres for maintenance and light T2- Blue Atlantic Cedar tree- to cut back by 2-3 m...

WORKS TO TREES WITH TREE PRESERVATION ORDER Welwyn Hatfield
13 Aug 2026 Under Consultation 6/2026/1422/TPO

8 Bluebells Welwyn AL6 0XD

TPO 639 (2017) - Trim two Hornbeam Trees by 25 to 30%

WORKS TO TREES WITH TREE PRESERVATION ORDER Welwyn Hatfield
11 Aug 2026 Approved 6/2026/1416/TPO

43 Harmer Green Lane Digswell Welwyn AL6 0AP

TPO 658 - Fell dead pine tree and dying Silver birch tree

WORKS TO TREES WITH TREE PRESERVATION ORDER Welwyn Hatfield
6 Aug 2026 Pending 6/2026/1376/HOUSE

18 Briary Wood Lane Welwyn AL6 0TF

Erection of a single storey ground floor extension & part two storey rear, raising the roof and alterations to facilitate loft conversion to include n...

HOUSEHOLDER APPLICATION Welwyn Hatfield
6 Aug 2026 Pending 6/2026/1393/TPO

10 Bluebells Welwyn AL6 0XD

T1 & T2 Hornbeam reduce back to previous pruning points 25% or approximately 2.5m (TPO 639 2017)

WORKS TO TREES WITH TREE PRESERVATION ORDER Welwyn Hatfield
5 Aug 2026 Pending 6/2026/1390/HOUSE

38 Butterwick Way Welwyn AL6 9GH

Loft conversion with side facing dormer and 4 roof lights

HOUSEHOLDER APPLICATION Welwyn Hatfield
5 Aug 2026 Approved 6/2026/1370/LAWP

17-17A Mill Lane Welwyn AL6 9EU

Certificate of lawfulness for the change of use of offices to 3 x 2 bedroom flats

LAWFUL DEVELOPMENT - PROPOSED Welwyn Hatfield
5 Aug 2026 Pending 6/2026/1305/TPO

20 Mardley Avenue Welwyn AL6 0UD

Up to a 2m reduction to Cherry tree, to maintain its healthy station and prevent over extension, from growing too large. Fell, process and remove Yew ...

WORKS TO TREES WITH TREE PRESERVATION ORDER Welwyn Hatfield
31 Jul 2026 Under Consultation 6/2026/1355/FULL

Welwyn Pump Station School Lane Welwyn AL6 9PL

Erection of nine dwellings following demolition of existing garages and office building with associated access, internal roads, parking, landscaping, ...

FULL PERMISSION Welwyn Hatfield
31 Jul 2026 Under Consultation 6/2026/1330/HOUSE

7 Elmoor Close Welwyn AL6 9PF

Erection of single storey rear extension with undercroft storage and associated landscaping/land level alterations, alterations to fenestration and pa...

HOUSEHOLDER APPLICATION Welwyn Hatfield
29 Jul 2026 Approved 6/2026/1311/TC

West Manor House Ellesfield Welwyn AL6 9HB

G1 Group of Yew to lift to 5.5m over roadway, reduce lateral branches over road by 2m. G2 3 x Yew (raised bed - driveway) Prune lateral branches growi...

TREES IN CONSERVATION AREA Welwyn Hatfield
27 Jul 2026 Under Consideration 6/2026/1310/TPO

West Manor Ellesfield Welwyn AL6 9HB

T2 Horse Chestnut to reduce height to leave approximately 10m above ground level. This is due to a large decayed area in lower trunk. (covered by TPO ...

WORKS TO TREES WITH TREE PRESERVATION ORDER Welwyn Hatfield
22 Jul 2026 Under Consideration 6/2026/1288/LAWE

1 The Limberlost Welwyn AL6 9TS

Certificate of existing lawfulness for a single storey rear extension

LAWFUL DEVELOPMENT - EXISTING Welwyn Hatfield
20 Jul 2026 Approved 6/2026/1271/TPO

33 Oaklands Rise Welwyn AL6 0RN

Removal of dead hornbeam tree. (covered by TPO 673 (2017))

WORKS TO TREES WITH TREE PRESERVATION ORDER Welwyn Hatfield
13 Jul 2026 Under Consideration 6/2026/1200/HOUSE

98 Harmer Green Lane Digswell Welwyn AL6 0ES

Formation of front boundary gate with brick piers and erection of rear extension, rear orangery, side porch canopy, replacement front porch, alteratio...

HOUSEHOLDER APPLICATION Welwyn Hatfield
13 Jul 2026 Approved 6/2026/1229/TPO

2 Bracken Lane Welwyn AL6 0RB

Remove 1 x Oak. (covered by TPO 753 (2018))

WORKS TO TREES WITH TREE PRESERVATION ORDER Welwyn Hatfield
13 Jul 2026 Approved 6/2026/1205/TPO

12 Mardley Hill Welwyn AL6 0TN

TPO 24 T2 - 1 x Oak to remove in sections to ground level. Tree is suppressed by neighbouring tree leaving a high canopy, blocking lights to neighbour...

WORKS TO TREES WITH TREE PRESERVATION ORDER Welwyn Hatfield
10 Jul 2026 Under Consideration 6/2026/1198/HOUSE

9 Mardley Hill Welwyn AL6 0UE

Erection of single storey front, side and rear extension, raising the existing roof and formation of rear dormer. Alterations to the fenestration, inc...

HOUSEHOLDER APPLICATION Welwyn Hatfield
9 Jul 2026 Approved 6/2026/1182/TPO

18 Great North Road Welwyn AL6 0PS

T1 - Sweet Chestnut tree - Fell one dead sweet Chestnut tree to ground level

WORKS TO TREES WITH TREE PRESERVATION ORDER Welwyn Hatfield
8 Jul 2026 Under Consultation 6/2026/1033/MAJ

Sandyhurst 1 Welwyn By Pass Road Welwyn AL6 9HT

Erection of a 66 bedroom care home for the elderly (Use Class C2) with associated access, parking, landscaping and ancillary buildings following demol...

MAJOR DEVELOPMENT Welwyn Hatfield
3 Jul 2026 Under Consideration 6/2026/1067/FULL

The North Star 82 Great North Road Welwyn AL6 0TA

Use of an existing flat roof as a first-floor teaching terrace and installation of an external fire escape staircase

FULL PERMISSION Welwyn Hatfield
30 Jun 2026 Approved 6/2026/1121/HOUSE

45 New Road Digswell Welwyn AL6 0AQ

Garage conversion to habitable area, front extension within existing garage roof overhang, installation of rooflights and alterations to fenestration

HOUSEHOLDER APPLICATION Welwyn Hatfield
26 Jun 2026 Approved 6/2026/1108/TPO

16 Mardley Hill Welwyn AL6 0TN

T1 - 1 x Oak to reduce by approximately 2m height and width, ensuring to cut back clearing the house sufficiently. Oak reducing due to canopy in close...

WORKS TO TREES WITH TREE PRESERVATION ORDER Welwyn Hatfield
26 Jun 2026 Approved 6/2026/1095/TPO

31 Parkside Welwyn AL6 9DQ

T1 Goat Willow Pollard back to previous trimming points which is approx 3-4m off T2 Cedar Crown reduction by 2-3m approx back to previous pruning poin...

WORKS TO TREES WITH TREE PRESERVATION ORDER Welwyn Hatfield
25 Jun 2026 Approved 6/2026/1099/HOUSE

10 Windsor Close Welwyn AL6 9JZ

Erection of a single storey front extension with alterations to fenestration following the demolition of existing front porch

HOUSEHOLDER APPLICATION Welwyn Hatfield
24 Jun 2026 Approved 6/2026/1094/HOUSE

89 Warren Way Digswell Welwyn AL6 0DL

Erection of single storey side/rear extension, new front porch/level access, new garage, new side window, widening of driveway and accessible ramp dow...

HOUSEHOLDER APPLICATION Welwyn Hatfield
18 Jun 2026 Approved 6/2026/1063/TC

The Coach House Ellesfield Welwyn AL6 9HB

Reduce 1 x Horse chestnut by 2m. Cut back 1 x Sycamore to 1m beyond boundary line.

TREES IN CONSERVATION AREA Welwyn Hatfield
17 Jun 2026 Approved 6/2026/1056/TC

16 The Green Welwyn AL6 9EA

Fell 1 x weeping willow.

TREES IN CONSERVATION AREA Welwyn Hatfield
16 Jun 2026 Withdrawn 6/2026/1049/TC

41 High Street Welwyn AL6 9EF

Birch tree in corner of boundary next to residential homes, reduction in size by 30% to the overall size of the tree

TREES IN CONSERVATION AREA Welwyn Hatfield
16 Jun 2026 Withdrawn 6/2026/1036/LAWE

25 Bluebells Welwyn AL6 0XD

Certificate of Lawfulness for the erection of a first floor external balcony to the rear of the house

LAWFUL DEVELOPMENT - EXISTING Welwyn Hatfield
15 Jun 2026 Approved 6/2026/1037/TC

6 Hobbs Hill Welwyn AL6 9DS

Fell birch.

TREES IN CONSERVATION AREA Welwyn Hatfield
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Data updated daily. Source: Welwyn Hatfield Borough Council planning portal.