Appeal 3338884
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
10 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 on the application form as ‘alteration and additional floor over existing garage/new car garage to the side.’
Section 02
Decision
The appeal is dismissed.
Section 03
Preliminary Matters
Notwithstanding the description of development set out above, which is taken from the application form, it is clear from the plans and accompanying details that the development comprises a garage conversion, first floor extension over existing garage, 1no. detached garage and alterations to fenestration. The Council dealt with the proposal on this basis and so shall [name], the appellant has used this description in their appeal form.
Section 04
[name]
The main issues are: • whether the proposal would be inappropriate development in the Green Belt and the effect of the proposal on openness; • the effect of the proposed development on protected species; and • whether the harm by reason of inappropriateness, and any other harm, would be clearly outweighed by other considerations so as to amount to the very special circumstances required to justify the proposal.
Section 05
Whether inappropriate development and openness
The appeal site comprises a two-storey property, located off [address]. The property is positioned in a relatively large plot and has been extended in the past.
National Green Belt policy in the National Planning Policy Framework (the Framework) sets out that inappropriate development is, by definition, harmful to the Green Belt and should not be approved ‘except in very special circumstances.’ There are, however, certain exceptions. One of those, at paragraph 154, is the extension or alteration of a building, provided it does not result in disproportionate additions over and above the size of the original building. Policy QP5 of the Borough Local Plan 2013-2033 (LP, 2022) conforms to the general thrust of national Green Belt policy.
Neither the Framework nor the LP provide a definition of ‘disproportionate addition’. Therefore, an assessment of whether a proposal would amount to a disproportionate addition over and above the size of the original building is a matter of planning judgement.
The Council estimates that the cumulative floorspace of the dwelling, including both existing and proposed additions, would be approximately 184sqm. This appeal scheme proposal amounts to an increase of approximately 59.4%. These figures are accepted by the appellant.
Based on the evidence before me and my observations on site, I consider the proposed first floor extension, in isolation, not to form a disproportionate addition to the original dwelling, albeit in this instance this would be at the upper end of what could reasonably be considered proportionate. I accept that the first floor extension would increase the overall volume of the property. However, its footprint would not change and the overall scale of the extension, to my mind, would be limited in extent relative to [address].
However, the floorspace and volume of the proposed triple garage structure do not appear to have been included in the above measurements. This element of the scheme would clearly be detached from the main dwelling and could not therefore be considered an extension. There is no substantive evidence before me to demonstrate that the garage structure would meet any other exceptions under paragraph 154.
Taken together, the proposed development would be inappropriate development in the Green Belt which is, by definition, harmful. The proposed development would therefore conflict with the relevant provisions of LP Policy QP5, which in summary seeks to protect the Green Belt from inappropriate development. This is consistent with the Framework insofar as development in the Green Belt is concerned.
Section 06
Openness
The Framework indicates that openness is an essential characteristic of the Green Belt and a fundamental aim of Green Belt policy is to keep land permanently open. The openness of the Green Belt has both a physical and visual dimension. ‘Open’ can mean the absence of development in spatial terms, and it follows that openness can be harmed even when development is not readily visible from the public realm.
The appeal property is visible, in part, from the adjacent highway and neighbouring properties, and notwithstanding the existence of other properties near to the appeal site, the openness of the Green Belt is readily apparent beyond.
[name] have concluded that the first floor addition would not constitute inappropriate development, I have concluded that the garage structure would be inappropriate development. [name] accept that the proposed garage is relatively limited in its overall scale and mass, at single storey, and has been designed with sensitivity to prevailing building forms, materials and detailing, it would nonetheless result in built volume and massing where this does not presently exist. It would also draw development closer to the site entrance than is currently the case. For these reasons, the proposed garage structure would inevitably lead to a loss of openness, both physically and visually. Accordingly, the proposed development would cause harm to the openness of the Green Belt. This harm could reasonably be described as moderate.
Section 07
Protected species
A document entitled [name] (PEA), [name] (HSI) and Public Records Search, dated February 2024, has been submitted in support of the appeal.
This report, in summary, concludes that the proposed development would have no or minor adverse impacts on ecology & biodiversity. I have no reason to disagree with those findings.
Overall, based on the evidence before me, I conclude that the proposed development would have an acceptable effect on protected species and biodiversity, in accordance with the relevant provisions of LP Policy NR2. This policy, in summary, seeks to ensure that protected species and habitats are safeguarded from harm or loss. This is in a similar vein to the provisions of the Framework insofar as the protection of biodiversity and habitats is concerned.
Section 08
Other considerations
I have had due regard to the Public Sector Equality Duty (PSED) contained in section 149 of the Equality Act 2010, which sets out the need to eliminate unlawful discrimination, harassment and victimisation, and to advance equality of opportunity and foster good relations between people who share a protected characteristic and people who do not share it. Wider planning considerations are paramount but nevertheless the particular effects of the proposed development in this location are a matter to which I give significant weight in assessing the proposal.
The extension is proposed as accommodation required for the carers of the occupiers of the dwelling. The dismissal of the appeal means that the occupiers would be unable to derive the benefits of the accommodation as proposed. Therefore, the appeal decision has the potential to disproportionally effect the existing residents and these equality implications add considerable weight in favour of allowing the appeal.
However, I have no evidence before me to indicate that suitable carers accommodation could not be provided elsewhere within the previously extended main house, or if there is a need for a carer to stay at the property overnight. Moreover, I have no substantive evidence before me that demonstrates that the extension must be of the size that is proposed.
Section 09
Green Belt Balance
The development would constitute inappropriate development which, by definition, causes harm to the Green Belt. Substantial weight must be given to inappropriate development.
The development would provide accommodation which is contended to be required for carers. Nevertheless, personal circumstances seldom provide the sole basis for finding of very special circumstances. [name] find in this case that the combination of other considerations should be given considerable weight, this does not clearly and demonstrably outweigh the substantial weight that must be attached to the harm to the Green Belt. Looking at the case as a whole, very special circumstances do not exist.
Section 10
Conclusion
The proposed development would be inappropriate development in the terms set out by the Framework and would result in harm to the openness of the Green Belt. The Framework requires that substantial weight should be given to any harm to the Green Belt.
The harm identified would not be clearly outweighed by the other considerations and, therefore, the very special circumstances necessary to justify the proposed development do not exist. Consequently, 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 325No official casework-database value to compare
- Extracted decision date · page 1
- 8 October 2024Matches the official casework database
- Extracted site visit dates
- 4 October 2024 (page 1)
Reference and authority
Official identifiers and the planning authority recorded against this case.
- Case reference
- 3338884
- Application reference
- 23/02828
- 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
- 1. Refused planning permission
- Appeal reason
- Refusal
- Type detail
- Unknown
- Jurisdiction
- Transferred
- Link status
- Not Linked
Site and development
Published appeal-site measurements and planning designations, without the withheld precise location fields.
- Site area
- Not recorded
- Floor space
- 42 m²
- Number of residences
- 0
- Site in Green Belt
- Yes
- Agricultural holding
- No
- Affects setting of a listed building
- Not recorded
- 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
- 15 February 2024
- Valid date
- 15 February 2024
- Start date
- 18 April 2024
- Planning authority decision date
- 24 January 2024
- Appeal decision date
- 8 October 2024
Case administration
Published recovery, call-in, costs and enforcement information for this case.
- Redetermined
- No
- Bespoke
- No
- Date recovered
- Not recorded
- Date not recovered or derecovered
- Not recorded
- Call-in date
- Not recorded
- Costs applied for
- Not recorded
- 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
- Horizon
- Dataset status
- Current release
- Catalogue record ID
- 58106
- First seen
- 20 August 2026 at 14:24
- Last seen
- 20 August 2026 at 16:28
- Removed from release
- Not recorded
- Record created
- 20 August 2026 at 14:24
- Record updated
- 24 August 2026 at 16:21