11 Mardley Hill Welwyn AL6 0UE Data via plota.co.uk

6/2026/1641/TPO - WORKS TO TREES WITH TREE PRESERVATION ORDER Under Consideration
Trees & landscaping

Proposal

Oak tree on the edge of our boundary at 11 Mardley Hill, Oaklands AL6 0UE, reduced by one third for maintenance and it hangs over the B197 main road 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
21 Sept 2026
✓
Validated
22 Sept 2026
Decision
Expected by 17 Nov 2026

Under consideration

No decision has been issued yet. Plota predicts a decision between 3 Nov 2026 and 13 Nov 2026, from Welwyn Hatfield's recent tree and landscaping works.

The consultation period closed on 15 Oct 2026.

Documents 2

Plans & drawings 1

IMG Tree plan 200926.png (485 kb) Document · 21 Sept 2026 View ↗

Other documents 1

PDF ApplicationFormRedacted.pdf (223 kb) Document · 21 Sept 2026 View ↗

All documents on the council site ↗

Site constraints 5

Local nature reserve 48 m away: Mardley Heath
Work nearby can need a habitats assessment.
Harm to a protected site is only accepted where there is no alternative and an overriding public interest.
Habitat network: Network Enhancement Zone 2
Where habitat is joined up enough to work as a network. Context, not a constraint on its own.
Also on the record
Radon affected area, class 2; Inside the Woolmer Green built-up area; Priority habitat 40 m away: Deciduous woodland.
Not affected
Outside flood zones 2 and 3 · Not green belt · No listed building at the site

Checked on 16 October 2026. Historic England, the Environment Agency, Natural England, the British Geological Survey and UK Health Security Agency (radon, contains BGS materials © UKRI) 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

10 Jul 2026Approved

9 Mardley Hill Welwyn AL6 0UE

Erection of single storey front, side and rear extension, raising the existing r...

6/2026/1198/HOUSE
13 Jul 2026Approved

12 Mardley Hill Welwyn AL6 0TN

TPO 24 T2 - 1 x Oak to remove in sections to ground level. Tree is suppressed by...

6/2026/1205/TPO
26 Jun 2026Approved

16 Mardley Hill Welwyn AL6 0TN

T1 - 1 x Oak to reduce by approximately 2m height and width, ensuring to cut bac...

6/2026/1108/TPO

Nearby new applications

16 Oct 2026Pending

The North Star 82 Great North Road Welwyn AL6 0TA

Submission of details pursuant to condition 9 (Noise Management Plan) and condit...

6/2026/1878/COND
29 Sept 2026Pending

24 Marlborough Close Welwyn AL6 0UG

1 x Oak to reduce lateral branches over the garden of No.24 & 22 by approx 2m, u...

6/2026/1716/TPO
28 Sept 2026Pending

28 Marlborough Close Welwyn AL6 0UG

T1 - Horse Chestnut - re pollard back to previous growth points and remove any m...

6/2026/1704/TC
28 Sept 2026Pending

12 Pine Crest Welwyn AL6 0EQ

Erection of a single storey rear extension and additional floor to existing bung...

6/2026/1700/HOUSE
22 Sept 2026Pending

2 Mardley Avenue Welwyn AL6 0UD

Reduce 1 x Hornbeam by 40% crown reduction covered by TPO 643 Branches overgrown...

6/2026/1677/TPO
16 Sept 2026Pending

The North Star 82 Great North Road Welwyn AL6 0TA

Submission of details pursuant of conditions 5 (noise), 6 (EV charging points), ...

6/2026/1611/COND

Important details

Council
Welwyn Hatfield
Application type
WORKS TO TREES WITH TREE PRESERVATION ORDER
Postcode
AL6 0UE
Received
21 Sept 2026
Validated
22 Sept 2026
Parish
Welwyn
Case officer
Show
Decision level
Delegated
Applicant
Show
Agent
Show

Decision outlook

Day 36 of the 56-day target. Welwyn Hatfield usually decides tree and landscaping works by day 48.

Day 3620 days to the 56-day target
71%decided within 8 weeks
98%approved
559decided in the last year

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

Consultation & key dates

Comments by
15 Oct 2026

Historical activity at this location

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

This property

Previous applications at this address

2017 Approved
Certificate of lawfulness for the conversion of garage into habitable space
6/2017/0202/LAWP
Within ~100m

Nearby activity

2025 Approved
12 Marlborough Close Welwyn AL6 0UG
TPO 643 - Two ash trees at front of property to crown reduce by 25%. They are getting too…
6/2025/0606/TPO
2025 Approved
12 Marlborough Close Welwyn AL6 0UG
TPO 643 - Two ash trees at front of property to crown reduce by 25%. They are getting too…
6/2025/0606/TPO
2024 Approved
2A Hangmans Lane Welwyn AL6 0TJ
TPO 677 (2017) - Trim oak tree by 25% - 30% of the total existing tree cover. In particul…
6/2024/1845/TPO
2024 Approved
8 Mardley Hill Welwyn AL6 0TN
T1 - Spruce / Fir - 2 Meter crown reduction and removal of dead wood. Reason for Work to…
6/2024/0595/TPO
2023 Approved
8 Mardley Hill Welwyn AL6 0TN
T23 Oak, T25 Oak and T28 Oak - crown reduction by 2 metres due to blocking sunlight for t…
6/2023/2245/TPO
2023 Approved
8 Mardley Hill Welwyn AL6 0TN
T23 Oak, T25 Oak and T28 Oak - crown reduction by 2 metres due to blocking sunlight for t…
6/2023/2245/TPO
2022 Approved
1A Marlborough Close Welwyn AL6 0UG
Erection of front porch, and part two, part single storey side and rear extension incorpo…
6/2022/2782/HOUSE
2022 Approved
1A Marlborough Close Welwyn AL6 0UG
Erection of front porch, and part two, part single storey side and rear extension incorpo…
6/2022/2782/HOUSE
2022 Approved
10 Mardley Hill Welwyn AL6 0TN
T1 - English Oak - tree is located on the right hand side of the front driveway of the pr…
6/2022/1764/TPO
2022 Approved
10 Mardley Hill Welwyn AL6 0TN
T1 - English Oak - tree is located on the right hand side of the front driveway of the pr…
6/2022/1764/TPO
2022 Approved
15 Mardley Hill Welwyn AL6 0UE
Two beech trees (either end of a set of three) to crown lift to 4m above ground level, an…
6/2022/1753/TPO
2022 Approved
15 Mardley Hill Welwyn AL6 0UE
Two beech trees (either end of a set of three) to crown lift to 4m above ground level, an…
6/2022/1753/TPO
2021 Approved
1 Mardley Hill Welwyn AL6 0UE
Conversion of Staff Room/Store to Nursery Room and erection of 1 x Standing Staff Room
6/2021/3340/FULL
2021 Approved
1 Mardley Hill Welwyn AL6 0UE
Conversion of Staff Room/Store to Nursery Room and erection of 1 x Standing Staff Room
6/2021/3340/FULL
2020 Approved
10 Marlborough Close Welwyn AL6 0UG
Reduce 1 x oak by 20% covered by TPO24
6/2020/0496/TPO
2020 Approved
10 Marlborough Close Welwyn AL6 0UG
Reduce 1 x oak by 20% covered by TPO24
6/2020/0496/TPO
2019 Approved
1A Marlborough Close Welwyn AL6 0UG
Erection of front porch, single storey side extension, two storey side and rear extension…
6/2019/2827/HOUSE
2019 Withdrawn
1A Marlborough Close Welwyn AL6 0UG
Erection of a two storey side extension and replacement entrance porch
6/2019/1257/HOUSE
2019 Approved
1A Marlborough Close Welwyn AL6 0UG
Erection of a single storey side and rear extension and conversion of existing garage int…
6/2019/0171/HOUSE
2018 Approved
15 Mardley Hill Welwyn AL6 0UE
Erection of single storey side extension following demolition of garage
6/2018/3275/HOUSE
2017 Approved
8 Mardley Hill Welwyn AL6 0TN
Installation of 3 front rooflights, 3 rear dormer windows and raising of roof height to f…
6/2017/2919/HOUSE
2017 Approved
12 Marlborough Close Welwyn AL6 0UG
Reduce 2 x Ash trees by up to 30% covered by TPO 599 (2016)
6/2017/1630/TPO
2017 Approved
1 Marlborough Close Welwyn AL6 0UG
Crown reduce Oak tree by 20% covered by TPO 599 (2016)
6/2017/0944/TPO
2016 Approved
8 Mardley Hill Welwyn AL6 0TN
Reduce 4 Oak trees T23, T24, T25 and T28 by 33% and remove lower branches covered by TPO…
6/2016/1805/TPO
2016 Approved
8 Mardley Hill Welwyn AL6 0TN
Reduce 4 Oak trees T23, T24, T25 and T28 by 33% and remove lower branches covered by TPO…
6/2016/1805/TPO
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

Freehold boundary: © Crown copyright and database rights 2026, HM Land Registry. Polygons © Crown copyright and database rights 2026 Ordnance Survey 100026316. Conditions of use