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Planning application

25/02550/CPU

23 Cotsford Avenue New Malden KT3 5EU

Refused Kingston upon Thames Cert of Lawful Use/Operation - Proposed

Proposal

Erection of a single storey rear detached outbuilding to be used as a home office/garden room.

As published by the council, reference 25/02550/CPU

Timeline

Dates from the published record

  1. 30 Sep 2025

    Received by Kingston upon Thames

  2. 10 Dec 2025

    Decision issued: Refuse

  3. 3 Aug 2026

    Added to PlanIndex

What refusal means

The process from here

The council refused this application for the reasons set out on the decision notice, which the council portal holds in full. Only the applicant can appeal a refusal; the time limit runs from the decision date and is shorter for householder schemes.

Refusal does not prevent a fresh attempt. Applicants often address the reasons for refusal and resubmit, so a refused scheme is not necessarily the end of proposals for the site.

About lawful development applications

How this application type works

A lawful development certificate is a legal determination, not a planning judgement. It asks the council to confirm either that existing use or works are lawful, often through the passage of time, or that a proposal would not need planning permission at all. The applicant must prove the facts; the merits of the scheme are not considered.

More on lawful development applications in our guide

Nearby applications

Within 500 metres

  • 26/01304/FUL Awaiting decision

    21 Cotsford Avenue New Malden KT3 5EU

    Demolition of existing dwelling. Erection of replacement dwelling.

    18 Jun 2026 94m away Full applications
  • 22/03912/HOU Granted

    11 Cotsford Avenue New Malden KT3 5EU

    Erection of single storey rear, front porch and side extension. Erection of roof extension and installation of 2nos front. 2nos rear and 3nos side rooflights to facilitate loft conversion. Relocation of main entrance door.

    20 Dec 2022 94m away Householder
  • 21/02662/NMA Granted

    Lse Sports Ground Windsor Avenue New Malden KT3 5HB

    Application for Non-Material Amendment to Planning Permission ref: 19/01336/FUL (Installation of a new cold water storage tank and pumps). Amendments to include forming separate housing enclosure units

    17 Aug 2021 110m away Amendments
  • 21/04091/FUL Withdrawn

    71 Windsor Avenue New Malden KT3 5HE

    Erection of a 2 storey new dwelling house to the rear of the property with associated parking, cycle storage and bin storage

    24 Dec 2021 139m away Full applications
  • 21/02087/FUL Granted

    71 Windsor Avenue New Malden KT3 5HE

    Erection of 2 storey house to rear of existing property with formation of vehicular crossover, associated parking, amenity space, cycle parking and refuse/recycling store.

    29 Jun 2021 145m away Full applications
  • 21/02314/CLC Granted

    5 Cotsford Avenue New Malden KT3 5EU

    Details required for Condition 14 (Construction Logistics Plan) of planning permission 20/01830/FUL (Erection of two-storey dwelling house and attached garage (following demolition of existing house, garage and outbuilding) with associated cycle storage and refuse enclosure)

    16 Jul 2021 148m away Conditions

In Kingston upon Thames

  • 26/01186/CPU Granted

    116 Deacon Road Kingston Upon Thames KT2 6LU

    Erection of hip to gable roof extension with rear dormer and installation of 2nos front rooflights.

    4 Jun 2026 Lawful development
  • 26/01097/CPU Granted

    3 Sherwood House Kingston Vale London SW15 3PP

    Use of home for administration of private hire vehicle operating centre

    22 May 2026 Lawful development
  • 26/01085/CPU Granted

    96 Thornhill Road Tolworth KT6 7TH

    Erection of hip to gable rear dormer roof extension, installation of 2no front roof lights and 1 new gable end window.

    21 May 2026 Lawful development
  • 26/01648/CPUF Awaiting decision

    66 Douglas Road Kingston Upon Thames KT1 3PT

    Erection of a single storey detached domestic garden outbuilding

    28 Jul 2026 Lawful development
  • 26/01052/CPU Granted

    5 Burberry Close New Malden KT3 3AR

    Conversion of an existing garage into habitable room with associated alteration to fenestration

    18 May 2026 Lawful development