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Construction of a part single-storey, part two-storey rear and side extension following the demolition of the existing rear extension, side extension, and front garage. Ridgeline roof conversion featuring one front and one side conservation style rooflight. Installation of a swimming pool to the rear.

17, Ailsa Road, Twickenham, TW1 1QJ

The decision has been made on the application.Reference: PA26/2041London Borough of Richmond upon Thames

Last published check: 3 Oct 2026, 00:01. Check the council record for more recent changes.

Application location

17, Ailsa Road, Twickenham, TW1 1QJ

This record has no verified map location.

Application summary

Status
The decision has been made on the application.
Application type
Householder Application
Received
11 Jun 2026
Validated
15 Jun 2026
Determination deadline
10 Aug 2026
Local authority
London Borough of Richmond upon Thames

Application overview

Construction of a part single-storey, part two-storey rear and side extension following the demolition of the existing rear extension, side extension, and front garage. Ridgeline roof conversion featuring one front and one side conservation style rooflight. Installation of a swimming pool to the rear.

Proposal details

Reference
PA26/2041
Alternative references
PP-15003296
Ward
St. Margarets & North Twickenham Ward [SMN]
Agent
Space
UPRN
100022328750

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Documents 37 of 37

DocumentPublishedAction
Application Form - Without Personal DataApplication Form - Redacted11 Jun 2026View
The location planSubmitted Drawing11 Jun 2026View
Design, access and heritage statementReport11 Jun 2026View
Flood Risk AssessmentReport11 Jun 2026View
Fire Safety StatementReport11 Jun 2026View
Existing Block PlanSuperseded Drawing12 Jun 2026View
Proposed Block PlanSuperseded Drawing12 Jun 2026View
Existing/Proposed Basement PlanSuperseded Drawing12 Jun 2026View
Existing/Proposed Rear ElevationSuperseded Drawing12 Jun 2026View
Existing/Proposed Side ElevationsSuperseded Drawing12 Jun 2026View
Existing/Proposed Section AASuperseded Drawing12 Jun 2026View
Proposed Seciton AASuperseded Drawing12 Jun 2026View
Existing/Proposed Ground FloorSuperseded Drawing12 Jun 2026View
Existing/Proposed First Floor PlanSuperseded Drawing12 Jun 2026View
Existing/Proposed Loft Floor PlanSuperseded Drawing12 Jun 2026View
Existing/Proposed Roof PlanSuperseded Drawing12 Jun 2026View
Proposed Ground Floor PlanSuperseded Drawing12 Jun 2026View
Proposed First Floor PlanSuperseded Drawing12 Jun 2026View
Proposed Loft PlanSuperseded Drawing12 Jun 2026View
Existing/Proposed Front ElevationSuperseded Drawing12 Jun 2026View
Existing and Proposed Block PlansSuperseded Drawing15 Jun 2026View
Existing and Proposed Block PlansRevised Drawing30 Jun 2026View
Existing/Proposed First Floor Plan 03 ARevised Drawing30 Jun 2026View
Existing/Proposed Ground Floor Plan 02 ARevised Drawing30 Jun 2026View
Existing/Proposed Basement Floor Plan 01 ARevised Drawing30 Jun 2026View
Existing/Proposed Section BB 13 ARevised Drawing30 Jun 2026View
Existing/Proposed Section AA 12 ARevised Drawing30 Jun 2026View
Existing/Proposed Side Elevations 11 ARevised Drawing30 Jun 2026View
Existing/Proposed Rear Elevations 10 ARevised Drawing30 Jun 2026View
Existing/Proposed Front Elevations 09 ARevised Drawing30 Jun 2026View
Existing/Proposed Loft Floor Plan 04 ARevised Drawing30 Jun 2026View
Existing/Proposed Roof Plan 05 ARevised Drawing30 Jun 2026View
Existing/Proposed First Floor Plan 03 ARevised Drawing30 Jun 2026View
Proposed Ground Floor 06 ARevised Drawing30 Jun 2026View
Proposed First Floor 07 ARevised Drawing30 Jun 2026View
DecisionDecision Notice21 Jul 2026View
Officer ReportReport22 Jul 2026View

Documents open on the council website. Browse council documents if a link has changed.

Application timeline

Council milestones and published deadlines. A deadline passing does not confirm a decision.

  1. Application date

    Published milestoneCouncil source

  2. Received date

    Published milestoneCouncil source

  3. Registration date

    Published milestoneCouncil source

  4. Valid date

    Published milestoneCouncil source

  5. Press notice start date

    Published milestoneCouncil source

  6. Site notice date

    Published milestoneCouncil source

  7. Consultation expiry date

    Past published deadline

    A published target or deadline. It does not confirm an outcome.

    Council source

  8. Statutory expiry date

    Past published deadline

    A published target or deadline. It does not confirm an outcome.

    Council source

  9. Publicity end date

    Past published deadline

    A published target or deadline. It does not confirm an outcome.

    Council source

  10. Site notice end date

    Past published deadline

    A published target or deadline. It does not confirm an outcome.

    Council source

  11. Dispatch date

    Published milestoneCouncil source

  12. Decision date

    Published milestoneCouncil source

  13. Decision due date

    Past published deadline

    A published target or deadline. It does not confirm an outcome.

    Council source

Decision & conditions

Refused Permission
Decision
Planning conditions
  1. In accordance with paragraphs 38-42 of the National Planning Policy Framework, Richmond upon Thames Borough Council takes a positive and proactive approach to the delivery of sustainable development, by: {\b o} Providing a formal pre-application service {\b o} Providing written policies and guidance, all of which is available to view on the Council's website {\b o} Where appropriate, negotiating amendments to secure a positive decision {\b o} Determining applications in a timely manner. In this instance: {\b o} The applicants did not seek formal pre-application advice, and the scheme was found to be contrary to policy and guidance, and subsequently refused. The Council is ready to enter into discussions, through the Council's formal pre-application service, to advise the applicants of relevant policy and guidance; and where possible assist in the preparation of a new planning permission. More information on the pre-application service and relevant fees can be found online at www.richmond.gov.uk/pre-application_for_developers.
  2. For the avoidance of doubt the Drawing(s) No(s) to which this decision refers are as follows:- BP1 Rev A; BP2 Rev A; 01 Rev A; 02 Rev A; 03 Rev A; 04 Rev A; 05 Rev A; 06 Rev A; 07 Rev A; 08 Rev A; 09 Rev A; 10 Rev A; 11 Rev A; 12 Rev A; 13 Rev A; all received 30th June 2026. Location Plan; and Application Form, received 11th June 2026.
  3. The proposed two storey side extension, by reason of its siting and depth, would result in an unsympathetic and incongruous form of development that fails to preserve or enhance the character and appearance of the surrounding conservation area and host building of townscape merit. The scheme is therefore contrary to, in particular, policies 28, 29 & 30 of the Local Plan (2025), Supplementary Planning Document 'House Extensions and External Alterations' (2015) as supported by the St Margarets Conservation Area (CA19) Statement.
  4. The development, by reason of the absence of an Arboricultural Impact Assessment, Tree Protection Plan (TPP) and Arboricultural Method Statement has failed to demonstrate that the proposal would not detrimentally impact on the health and longevity of nearby trees to the detriment of the visual amenity of the locality and the character and appearance of the area. The proposal is contrary to the NPPF and, in particular, policies 28 and 42 of the Local Plan.
  5. By reason of its siting within areas of groundwater flooding and Flood Zone 2, and absence of a satisfactory Basement Screening Assessment/Basement Impact Assessment (as per the Basement Assessment User Guide), the application has failed to demonstrate that the proposed swimming pool will not increase or otherwise exacerbate flood risk on the site or beyond. The development is thereby contrary to the Local Plan policies 54 and 8, the Strategic Flood Risk Assessment (2021), Basement Assessment User Guide (2021) and the aims and objectives of the NPPF (2023).
  6. The development, by reason of the absence of an adequate sustainable drainage strategy, has failed to demonstrate the development will not increase flood risk elsewhere. The scheme is contrary to the NPPF, London Plan policy SI12 and SI13, Local Plan policy 8, as supported by the Council's Strategic Flood Risk Assessment.
  7. In the absence of a Preliminary Ecological Appraisal and Bat Roost Assessment, the scheme fails to demonstrate that habiats and species will not be adversely impacted, and thereby fails to comply with the aims and objectives of the NPPF and Development Plan policies, in particular, part IV of Circular 06/2005 and Local Plan policy 39.
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