Grenville St Marys Hill Ascot SL5 9AP Data via plota.co.uk

26/01933/NMA - Non-material Amendment Approved
Admin / procedural

Proposal

Non material amendment to planning permission 25/03261/FULL for a reduction in the width and height of the side extension, increase in depth of side and rear extension and alterations to existing and proposed fenestration. Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
5 Aug 2026
✓
Validated
10 Aug 2026
✓
Approved
2 Sept 2026

Approved on 2 Sept 2026 · Delegated · Last checked 3 Sept 2026

Documents 5

Decision & officer reports 1

PDF Permit nma Councils Decision · 2 Sept 2026 View ↗

Statements & assessments 2

PDF Planning officers report Planning Officers Assessment · 2 Sept 2026 View ↗ PDF Supporting statement Planning Statement · 5 Aug 2026 View ↗

Other documents 2

PDF History log Property History · 10 Aug 2026 View ↗ PDF Application Forms Application Forms · 5 Aug 2026 View ↗

All documents on the council site ↗

Associated applications 2

  • Part of

    FullApprovedcouncil archive
    • AmendmentNon material amendment for a reduction in the width and height of the side extension, increase…This application26/01933/NMA

Site constraints 1

Also on the record
Inside the Ascot and Sunningdale built-up area.
Not affected
Outside flood zones 2 and 3 · Not green belt · No listed building at the site

Checked on 6 October 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.

Sales history 1

Last sold for £1,100,000 in March 2025. Detached house, freehold.

28 March 2025£1,100,000

Sale prices from HM Land Registry's price paid record, matched to this application by its address.

Building

Floor area126 m² (1,356 sq ft)
Energy ratingE (48 out of 100), could reach C
PropertyDetached house, 7 habitable rooms
Built1930 to 1949
HeatingBoiler and radiators, mains gas
WallsCavity wall, as built, no insulation (assumed)

From the energy performance certificate lodged in October 2024, the latest held for this property. The building may have changed since. View the certificate

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Other new applications on this street

14 Jul 2026Withdrawn

1 Ridgemount St Marys Hill Ascot SL5 9AT

(T4) - Oak - Reduce by 2m overall, to leave a finished height of 25m and a finis...

26/01728/TPO

Nearby new applications

10 Aug 2026Pending

Former 38 Woodend Drive Ascot SL5 9BG

1no. new dwelling, 1no. bin store, hardstanding, landscaping and new sliding gat...

26/01980/FULL
24 Jul 2026Pending

Novello Theatre 2 High Street Sunninghill Ascot SL5 9NE

New front parapet wall and entrance canopy, two single storey side extensions, p...

26/01819/FULL
11 Aug 2026Pending

Chasebury Brockenhurst Road Ascot SL5 9HA

Single storey side/rear orangery, following demolition of existing

26/01981/FULL
27 Jul 2026Pending

Cordes Hall High Street Sunninghill Ascot SL5 9NE

Single storey rear and infill extension to create a link to the Novello Theatre,...

26/01826/FULL
26 Aug 2026Pending

51 Upper Village Road Ascot SL5 7AJ

Single storey side extension following the demolition of the existing garage.

26/02120/FULL
14 Aug 2026Pending

51 Upper Village Road Ascot SL5 7AJ

Certificate of lawfulness to determine whether the existing hip to gable, 2no. f...

26/02011/CLD

Important details

Council
Windsor and Maidenhead
Application type
Non-material Amendment
Postcode
SL5 9AP
Received
5 Aug 2026
Validated
10 Aug 2026
Ward
Ascot & Sunninghill
Parish
Sunninghill And Ascot Parish
Case officer
Show
Target decision
6 Sept 2026
Decision
Application Permitted
Decision date
2 Sept 2026
Decision level
Delegated
Applicant
Show
Agent
Nicolas Blunt

Consultation & key dates

Alt. reference
PP-15136209
Planning Portal ref
PP-15136209
Statutory expiry
6 Sept 2026
Env. assessment
No

Historical activity at this location

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

This property

Previous applications at this address

2025 Approved
Single storey front extension and single storey rear/side extension following demolition…
25/03261/FULL
2025 Approved
Certificate of lawfulness to determine whether the proposed part garage conversion, singl…
25/02872/CPD
2025 Refused
Single storey front extension, single storey side extension, single storey rear extension…
25/02001/FULL
2023 Approved
Garage conversion, part single part two storey rear/side extension and alterations to fen…
23/02689/FULL
2023 Approved
Certificate of lawfulness to determine whether the proposed single storey side extension…
23/02760/CPD
2023 Refused
Alterations to front entrance canopy, single storey side extension, two storey side exten…
23/00870/FULL
Within ~100m

Nearby activity

2023 Approved
Marys Wood St Marys Hill Ascot SL5 9AP
T1 Pine - fell (036/1997/TPO).
23/01245/TPO
2021 Approved
4 Murray Court Ascot SL5 9BP
Extension of the existing front canopy, part garage conversion into habitable accommodati…
21/03353/FULL
2021 Approved
Court Cottage 33 Murray Court Ascot SL5 9BP
Certificate of lawfulness to determine whether the proposed erection of a single storey r…
21/02102/CPD
2021 Approved
4 Murray Court Ascot SL5 9BP
Extension of the existing front porch canopy, part garage conversion, single storey rear…
21/01291/FULL
2020 Approved
Errant Courtney St Marys Hill Ascot SL5 9AP
(T1) Large Oak -reprofile the canopy of the tree away from the house by a maximum length…
20/03083/TPO
2020 Approved
2 The Glade Ascot SL5 9BE
(T1) - Beech - Raise canopy to 4m from ground leve and provide maximum 2.5m branch cleara…
20/00739/TPO
2019 Approved
Badgers Wood St Marys Hill Ascot SL5 9AP
Non material amendments to planning permission 19/01913/FULL for the increase in size of…
19/03175/NMA
2019 Approved
Badgers Wood St Marys Hill Ascot SL5 9AP
New front porch, part single part two storey side extension with first floor rear balcony…
19/01913/FULL
2017 Approved
45 Woodend Drive Ascot SL5 9BD
Certificate of lawfulness to determine whether the existing garage conversion and alterat…
17/00565/CLU
2016 Approved
32 Murray Court Ascot SL5 9BP
Rear conservatory following demolition of existing conservatory.
16/03287/FULL
2016 Approved
3 The Glade Ascot SL5 9BE
Scots Pine (T1) Fell, cavities located between 5-10 metre in main stem with decay. Poor s…
16/00919/TPO
Windsor and Maidenhead
Planning Authority Score
5.3/10
Average
#135 of 296 councils
Relevant to this application:
Householder decisions

Windsor and Maidenhead is faster than most councils at deciding householder applications, ranking #82 out of 296. Only 28% of applications have the time limit extended, well below the 41% national average - the council usually decides on time. Windsor and Maidenhead is also one of the strictest councils - it refuses more householder applications than almost any other, with only 74% approved vs 90% nationally.

One of the strictest councils
only 74% approved vs 90% nationally
These figures are council-wide context, not a prediction for this application. View full council performance
Windsor and Maidenhead decision statistics
Based on MHCLG data, the year to March 2026
72%
Overall approval rate
Below avg (87%) #293 of 296
74%
Householder approved
Below avg (90%) #294 of 296
75%
Decided in 8 weeks
Above avg (63%) #82 of 296
28%
Extended time limit
Below avg (41%) #47 of 296
44%
Minor dwellings approved
156 decided (1-9 homes)
96%
Major dwellings approved
27 decided (10+ homes)
64%
Change of use approved
25 decided
1,530
Total decisions
434 refused in the year to March 2026
Source: MHCLG planning statistics · See full council rankings

Sale prices: Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.

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

Energy performance: Energy performance certificates from the Energy Performance of Buildings Register, Ministry of Housing, Communities and Local Government. Contains public sector information licensed under the Open Government Licence v3.0. © Crown copyright 2026.