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Planning application

62 Illingworth Windsor SL4 4UP

Refused Windsor and Maidenhead 20/03162/CPD Cert of Lawfulness of Proposed Dev

Works: Extension Windows or glazing Small domestic

Read from the description, not a valuation. How we read the register

Refused. Only the applicant can appeal, within the statutory time limit, and a revised scheme can be submitted instead.

Proposal

Certificate of lawfulness to determine whether the proposed single storey rear extension and alterations to rear fenestration is lawful.

As published by the council, reference 20/03162/CPD

Application record

Reference
20/03162/CPD
Type
Cert of Lawfulness of Proposed Dev
Status
Decided
Decision
Refuse
Received
25 Nov 2020
Validated
25 Nov 2020
Decided
19 Jan 2021
Ward
Clewer And Dedworth East
Parish
Windsor Unparished
Decision by
Delegated
Postcode
SL4 4UP

Site history

Applications at this address on the Windsor and Maidenhead register

This site has had 3 applications since 2020: 2 approved, 1 refused.

  • 25/03001/FULL Granted

    62 Illingworth Windsor SL4 4UP

    First floor front/side extension.

    Decided 16 Feb 2026 Full applications
  • 21/00159/FULL Granted

    62 Illingworth Windsor SL4 4UP

    Single storey rear extension.

    Decided 4 Mar 2021 Full applications

Timeline

Dates from the published record

  1. 25 Nov 2020

    Received by Windsor and Maidenhead

  2. 19 Jan 2021

    Decision issued: Refuse

  3. 12 Sep 2026

    Added to PlanIndex

Who's behind it

Company information only, from the register and Companies House

ASS-Tech Design Consultancy Agent, a design practice

34 applications on PlanIndex · across 7 councils · 79% granted

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Documents

Plans, drawings, consultee responses and the officer's report

7 documents on file for this application

A planning file usually holds the application form, drawings and site plans, consultee responses, the officer's report and the decision notice.

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What this refusal means

Windsor and Maidenhead refused this application for the reasons on the decision notice; only the applicant can appeal, and refused schemes often return in revised form. More in our guide to what happens after a planning decision.

About lawful development applications

A lawful development certificate is a legal determination that existing or proposed works do not need planning permission; the merits of the scheme are not considered. More in our guide to planning application types.

Nearby applications

Within 500 metres

  • 62 Illingworth Windsor SL4 4UP

    25/03001/FULL Submitted 13 Nov 2025 1m away

    First floor front/side extension.

    Granted Full applications Extension 16 docs

  • 62 Illingworth Windsor SL4 4UP

    21/00159/FULL Submitted 21 Jan 2021 1m away

    Single storey rear extension.

    Granted Full applications Extension 11 docs
    Small domestic

  • 64 Illingworth Windsor SL4 4UP

    23/00916/TPO Submitted 13 Apr 2023 19m away

    (T1) Oak - reduce crown by 4m to leave a spread of 10m and a height of 10m, remove deadwood and (T2) Oak - reduce crown by 4m to leave a spread of 8m and a height of 17m. (005/1960/TPO).

    Split decision Trees 6 docs

  • 66B Illingworth Windsor SL4 4UP

    23/01625/TPO Submitted 3 Jul 2023 32m away

    Oak tree - fell (005/1960/TPO).

    Granted Trees 8 docs

  • 66B Illingworth Windsor SL4 4UP

    21/02089/TPO Submitted 6 Jul 2021 35m away

    Oak - reduction of the branches to no closer than 1m to the point of previous reduction, by pruning back to another side branch/twig (TPO 5 of 1960).

    Granted Trees 17 docs

  • 68 Illingworth Windsor SL4 4UP

    21/00887/FULL Submitted 22 Mar 2021 48m away

    Part single/part two storey side/rear extension with Juliet balcony to rear elevation.

    Granted Full applications Extension 16 docs

In Windsor and Maidenhead

  • 26/01743/CPD Refused

    1 Aston Mead Windsor SL4 5PW

    Certificate of lawfulness to determine whether the proposed replacement single storey rear extension is lawful.

    16 Jul 2026 Lawful development
  • 26/01828/CPU Granted

    Concorde Park Concorde Road Maidenhead SL6 4FJ

    Certificate of lawfulness to determine whether a private hire operators licence for taxi services is lawful.

    27 Jul 2026 Lawful development
  • 26/01853/CPU Granted

    20 Craufurd Rise Maidenhead SL6 7LS

    Certificate of lawfulness to determine whether the proposed use of a room on the ground floor as private hire operators licence is lawful.

    27 Jul 2026 Lawful development
  • 26/01781/CPD Refused

    163 Arthur Road Windsor SL4 1RZ

    Certificate of lawfulness to determine whether the proposed rear L shaped dormer with Juliet balcony and new air source heat pump are lawful.

    21 Jul 2026 Lawful development
  • 26/01553/CLU Granted

    64 Priors Way Maidenhead SL6 2EN

    Certificate of lawfulness to determine whether the existing use of building as self-contained residential dwelling as per details set out in Statutory Declaration is lawful.

    24 Jun 2026 Lawful development