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

Pending 6/2026/1198/HOUSE
DemolitionExtensions & alterations
Council
Welwyn Hatfield 2.1/10
Date received
10 Jul 2026
Date validated
10 Jul 2026
Postcode
AL6 0UE

Description

Erection of single storey front, side and rear extension, raising the existing roof and formation of rear dormer. Alterations to the fenestration, including, installation of new windows and doors and external rendering and cladding, following the demolition of garage and porch… Data via plota.co.uk

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Other new applications on this street

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 - 10 Jul 2026

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 - 26 Jun 2026

Nearby new applications

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 - 10 Jul 2026

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 - 26 Jun 2026

The North Star 82 Great North Road Welwyn AL6 0TA

Use of an existing flat roof as a first-floor teaching terrace and installation ...

6/2026/1067/FULL - 19 Jun 2026

2 Woodacre Drive Welwyn AL6 0UA

T1 Oak Prune western aspect by 2 metres. (Covered by TPO24 A3 and TPO 642 (2017)...

6/2026/0974/TPO - 3 Jun 2026

69 Robbery Bottom Lane Welwyn AL6 0UL

Raising the existing roof line incorporating new rooflights, new dormer, externa...

6/2026/0943/HOUSE - 29 May 2026

Brambles Briary Wood End Welwyn AL6 0TD

TPO 800 T1 - Chestnut tree - crown reduce by approx 4-5m - tree is multi stem an...

6/2026/0825/TPO - 12 May 2026

Historical activity at this location

25 nearby applications on record - archival context, not part of the live application.

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 performance
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