Appeal 3267016
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
a loft conversion and ground floor rear extensions.
Section 02
Decision
The appeal is dismissed.
Section 03
Preliminary Matters
The description in the banner heading above is taken from the appellant’s original application form, noting that the Council in their decision notice used a longer version which listed all parts of the proposed development. However, under s.192 there is no implied power to modify the description of the proposed development.
The application sought is a certificate of lawfulness for a proposed development. The purpose of an application made under s.192 of the Act is to find out whether proposed development, as described in the application form and shown on the drawings, would be lawful if instituted or begun at the time of the application, it is not the equivalent, in law, of a planning permission. The burden of proof rests with the appellant and the appropriate test of the evidence is the balance of probabilities.
The planning merits of the proposed development are not relevant to this appeal. My decision rests on the facts of the case and the interpretation of any relevant planning law.
In reviewing the file, it appeared that the appeal could be determined without a site visit – without causing prejudice to any party. This is because the parties have submitted sufficient evidence to understand the nature of the site and the proposed development given the points in dispute.
The proposed development includes two single-storey extensions to the rear, a wrap-around rear dormer and two rooflights in the front roof slope.
Planning permission is granted by virtue of permitted development rights for certain types of development subject to specified conditions and limitations. Article 3 Schedule 2 Part 1 of the Town and Country Planning (General Permitted Development) (England) Order 2015 (as amended) (the GPDO) relates to development within the curtilage of a dwellinghouse and grants permission for the enlargement, improvement or other alteration of a dwellinghouse, including additions and alterations to the roof.
There is no dispute that the proposed single-storey extension, off the existing dining room, would constitute permitted development by virtue of Article 3 Schedule 2 Part 1 Class A of the GPDO and, that the rooflights would constitute permitted development by virtue of Class C of the GPDO.
The house is a terrace for the purposes of the definition in the Government’s Technical Guidance1. Therefore, in order to constitute permitted development by virtue of Part 1 Class B of the GPDO, amongst other criterion, the cubic content of the dormer should not exceed 40 cubic metres (B.1.(d)(i)).
In the original application form the appellant stated that the volume of the dormer would be no more than 50 cubic metres. However, the Council’s own calculations indicate that it would be 39.82 cubic metres and therefore would comply with the Class B.1.(d)(i) requirement and would constitute permitted development by virtue of Part 1 Class B.
The sole reason for refusal relates to the proposed single-storey extension to the rear of the two-storey outrigger, on the basis that the proposal would see the enlarged part of the dwellinghouse extend beyond a wall forming a side elevation of the original dwellinghouse and would have a width greater than half the width of the original dwellinghouse.
Section 04
Main Issue
I consider that the main issue is whether the Council’s decision to refuse to grant an LDC was well-founded.
Section 05
Reasons
The appeal property is an end of terrace house with a two-storey outrigger to the rear, with the rear of the outrigger including a further two-storey projection. Consequently, the rear is stepped and there is more than one wall which forms ‘the rear wall of the original dwellinghouse’. However, this also means that the dwelling has more than one side elevation wall.
[name].1.(j)(iii) of Class A of the GPDO states that development is not permitted if the enlarged part of the dwellinghouse would extend beyond a wall forming a side elevation of the original dwellinghouse and would have a width greater than half the width of the original dwellinghouse.
The Technical Guidance indicates that a wall forming a side elevation of a house will be any wall that cannot be identified as being a front or rear wall. In this case whilst the two-storey projection is a detail of the outrigger and although the depth of this element at around 60cm may be relatively limited, it nevertheless creates two walls which cannot be identified as a front or rear wall. 1 Permitted development rights for householders Technical Guidance Ministry of Housing, Communities and Local Government September 2019
The proposal includes the erection of a single-storey extension which would be the full width of the outrigger and would ‘wrap around’ and therefore extend beyond the side walls of the two-storey projection.
Accordingly, since the proposal would see the enlarged part of the dwellinghouse extend beyond a wall forming a side elevation of the original dwellinghouse, and would have a width greater than half the width of the original dwellinghouse, it would fail to meet the Class A.1.(j)(iii) requirement. Hence it would not be permitted by Class A of Part 1 of Schedule 2 of the GPDO.
The appellant referred to another appeal decision however, that case supports my judgement. Indeed, in that case the wall was only 10cm in depth and was considered to constitute a side elevation.
Section 06
Conclusion
The proposal does not comply with all the limitations and conditions in Class A and therefore is not permitted by the GPDO. It follows that the Council’s decision to refuse to grant a certificate of lawful use or development in respect of the proposal was well-founded and that the appeal should fail. I will exercise accordingly the powers transferred to me in section 195(3) of the 1990 Act as amended.
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 475No official casework-database value to compare
- Extracted decision date · page 1
- 14 July 2021Matches the official casework database
Reference and authority
Official identifiers and the planning authority recorded against this case.
- Case reference
- 3267016
- Application reference
- P/4161/20
- Lead case reference
- Not recorded
- Planning authority
- London Borough of Harrow
- Planning authority code
- E09000015
Casework details
The casework, procedure, development and linking details supplied by the official record.
- Casework type
- Lawful Development Certificate
- Procedure
- Written Representations
- Development type
- Householder developments
- Appeal type reason
- 1. The decision of the LPA refusing/refusing in part to grant a certificate of lawful use or development
- 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
- Not recorded
- Number of residences
- 0
- Site in Green Belt
- No
- Agricultural holding
- Not recorded
- 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 January 2021
- Valid date
- 15 January 2021
- Start date
- 11 March 2021
- Planning authority decision date
- 12 January 2021
- Appeal decision date
- 14 July 2021
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
- 683
- First seen
- 20 August 2026 at 14:24
- Last seen
- 20 August 2026 at 16:25
- Removed from release
- Not recorded
- Record created
- 20 August 2026 at 14:24
- Record updated
- 20 August 2026 at 16:25