Appeal 6003589
Public case and site metadata stored from the official casework database, including fields that were empty in the source release.
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Official decision document
The decision, section by section
6 sections
Read the development description and the Inspector’s text from the official decision PDF in source order. Source headings are retained where available. Personal and contact details are removed by an automated privacy filter; this is source material, not Rules for You analysis.
Section 01
Development description
described as “A rear extension 4 metres at the apex. The rear elevation is currently stepped. The western half will be 5.2 metres from the existing elevation as already granted, and the eastern half will be 6m from the existing elevation. the application is designed to align the 2 sections of the rear elevation make an improved architectural form.”
Section 02
Decision
The appeal is dismissed.
Section 03
Appeal Procedure
The site visit was undertaken by a representative of the Inspector whose recommendation is set out below and to which the Inspector has had regard before deciding the appeal.
Section 04
Background, Main Issue and Reasons for Recommendation
Under Article 3(1) and Schedule 2, Part 1, Class A of the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended (the GPDO), planning permission is granted for the enlargement of a dwellinghouse subject to limitations and conditions.
The parties dispute whether the submitted plans correctly show what is ‘existing’, as they show an extension which is currently under construction, for which express planning permission has been granted. Class A of the GPDO dictates that the depth of rear enlargements is measured from the rear wall of the original dwellinghouse. Therefore, the proposed development is considered in relation to the original rear elevation of the appeal dwelling. This dispute regarding the existing plans has therefore not altered my recommendation.
Where an application is made for prior approval for development which exceeds the limits in paragraph A.1(f) but is allowed by paragraph A.1(g) of Class A, paragraph A.4(3) provides that the local planning authority (LPA) may refuse the application where it considers that the proposed development does not comply – or that the developer has provided insufficient information to enable the authority to establish whether the proposed development complies with the conditions, limitations or restrictions that are applicable to such permitted development.
There is nothing substantive before me to suggest that the proposed development would fail to meet the criteria at GPDO paragraphs A.1 (a), (b), (c), (d), (e), (h), (i) and (k). Given that the development would measure 7.35 metres in depth and would not exceed 4 metres at its highest point, the proposal would exceed the limits in GPDO paragraph A.1(f), but not those outlined in paragraph A.1(g). Accordingly, in these circumstances, the conditions contained within paragraph A.4 apply to the development.
The main issue is whether the prior approval application was made “before beginning the development” as required by paragraph A.4(10) which states that development must not begin before the occurrence of either A.4(10)(a), (b), or (c).
[name].4(10) (a) and (b) state development must not commence until either the LPA has notified the applicant that prior approval is not required or, where it is required, given written notice of their prior approval. [name].4(10)(c) states the development must not begin before the expiry of 42 days following the date on which the information referred to in paragraph A.4(2) was received by the LPA without the LPA notifying the developer as to whether prior approval is given or refused.
The Council refused prior approval, and there is no substantive evidence before me to suggest that the decision was made outside of the required period.
In effect, the requirements set out under [name].4(10) are pre-conditions, and development will not benefit from permitted development rights if those conditions are not met.
The appellant contends that the prior approval scheme is merely an enlargement of the single storey rear extension that has extant planning permission. However, it has not been demonstrated that the development for which prior approval is sought can be clearly severed from the development under construction, given that the two elements form part of a single, large, open plan living space. Accordingly, the entire scheme, all of which is included within the description of development for this appeal, is subject to the conditions of paragraph A.4(10).
I observed that a substantial amount of development had commenced on site including, but not limited to, the ground floor slab and side elevation walls of the development for which permission has already been granted. Whilst these may indeed be part of implementing the existing permission, within the context of the proposed appeal development as described, these elements also evidently form part of what has been applied for, as a single rear enlargement.
Given that it is a prerequisite that prior approval is granted before work commences, it is not possible for prior approval to be granted retrospectively through this appeal. As work has commenced on development which forms part of the development for which prior approval is sought, it follows not only that prior approval is not deemed to be granted, but also that prior approval cannot be granted.
The prior approval application was not therefore made “before beginning the development” as required by paragraph A.4(10), and consequently the appeal development is not development permitted by Class A, Schedule 2, Part 1 of the GPDO.
Section 05
Conclusion and Recommendation
For the reasons given above, the proposed development has failed to comply with the conditions of the GPDO, and I therefore recommend that the appeal should be dismissed.
Section 06
Inspector’s Decision
I have considered all the submitted evidence and my representative’s report and on that basis the appeal is dismissed.
Planning inspector and document dates
The official casework attribution is grouped under a one-way keyed hash and shown only by its local identifier. Decision-letter dates and page references are extracted by fixed first-page rules and checked against that authoritative record.
Appeal Decision
- Extracted inspector · page 1
- Inspector attribution ID 133No official casework-database value to compare
- Extracted decision date · page 1
- 10 June 2026Matches the official casework database
- Extracted site visit dates
- 26 March 2026 (page 1)
Reference and authority
Official identifiers and the planning authority recorded against this case.
- Case reference
- 6003589
- Application reference
- 25/02724/PDXL
- Lead case reference
- Not recorded
- Planning authority
- Royal Borough of Windsor and Maidenhead
- Planning authority code
- E06000040
Casework details
The casework, procedure, development and linking details supplied by the official record.
- Casework type
- Householder (HAS)
- Procedure
- Written Representations
- Development type
- Householder developments
- Appeal type reason
- Not recorded
- Appeal reason
- refused
- Type detail
- Prior Approval
- Jurisdiction
- No Jurisdiction Associated
- Link status
- Not recorded
Site and development
Published appeal-site measurements and planning designations, without the withheld precise location fields.
- Site area
- 0 hectares
- Floor space
- 1,200 m²
- Number of residences
- Not recorded
- Site in Green Belt
- Yes
- Agricultural holding
- Not recorded
- Affects setting of a listed building
- Yes
- Historic building grant made
- Not recorded
- Relates to a conservation area
- Not recorded
- Flooding is an issue
- Not recorded
- Site within an AONB
- Not recorded
- Site within an SSSI
- Not recorded
Decision and dates
The published outcome and every imported case date.
- Official decision
- Dismissed
- Decision category
- Dismissed
- Received date
- 14 January 2026
- Valid date
- 14 January 2026
- Start date
- 19 January 2026
- Planning authority decision date
- 1 December 2025
- Appeal decision date
- 10 June 2026
Case administration
Published recovery, call-in, costs and enforcement information for this case.
- Redetermined
- Not recorded
- Bespoke
- Not recorded
- Date recovered
- Not recorded
- Date not recovered or derecovered
- Not recorded
- Call-in date
- Not recorded
- Costs applied for
- No
- Enforcement grounds count
- Not recorded
- Enforcement grounds
- Not recorded
Source and catalogue history
When this record appeared in the rolling official release and when the catalogue stored it.
- Source
- Planning Inspectorate casework database
- Source data system
- Back Office
- Dataset status
- Current release
- Catalogue record ID
- 90162
- First seen
- 20 August 2026 at 14:25
- Last seen
- 20 August 2026 at 16:29
- Removed from release
- Not recorded
- Record created
- 20 August 2026 at 14:25
- Record updated
- 24 August 2026 at 16:21