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Planning application

16 Owlscastle Close Horsham West Sussex RH12 5YA

Granted Horsham DC/25/1600 Certificate Proposed Lawful Use/Dev

Works: Extension Small domestic

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

Permission granted. Work must normally begin within three years of the decision or the permission lapses.

Proposal

Replacement of existing conservatory with new single storey rear extension and internal alterations to existing ground floor layout (Lawful Development Certificate - Proposed).

As published by the council, reference DC/25/1600

Application record

Reference
DC/25/1600
Type
Certificate Proposed Lawful Use/Dev
Status
Decided
Decision
Application Permitted
Received
7 Oct 2025
Validated
7 Oct 2025
Decided
2 Dec 2025
Ward
Holbrook West
Parish
North Horsham PC
Decision by
Delegated Decision
Postcode
RH12 5YA

Timeline

Dates from the published record

  1. 7 Oct 2025

    Received by Horsham

  2. 2 Dec 2025

    Decision issued: Application Permitted

  3. 12 Aug 2026

    Added to PlanIndex

Who's behind it

Company information only, from the register and Companies House

Agent on file, registered in East Sussex

20 applications on PlanIndex · across 5 councils · 94% granted

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Documents

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

13 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 a grant of permission means

The process from here

Permission has been granted, usually subject to conditions listed on the decision notice, some of which must be discharged before work starts. The decision notice on the council portal sets out exactly what was approved.

Work must normally begin within three years of the decision or the permission lapses. Neighbours cannot appeal a grant; challenging one means judicial review of how the decision was made, within tight time limits.

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

In Horsham

  • DC/26/1062 Granted

    Hayes Farm, Unit 3 Gay Street Pulborough West Sussex RH20 2HL

    Use of premises (Unit 3) as a light-industrial workshop for the purpose of joinery construction (Lawful Development Certificate - Existing).

    3 Jul 2026 Lawful development
  • DC/26/1028 Granted

    17 Purton Road Horsham West Sussex RH12 2HB

    Erection of a single storey rear infill extension (Lawful Development Certificate - Proposed).

    25 Jun 2026 Lawful development
  • DC/26/1265 Awaiting decision

    Malthouse Cottage Farm Malthouse Lane Ashington West Sussex RH20 3BU

    Use of land forming part of the domestic curtilage of Malthouse Cottage Farm for the stationing of a mobile home to provide an ancillary annex to the house (Lawful Development Certificate - Proposed)

    7 Aug 2026 Lawful development
  • DC/26/1271 Awaiting decision

    Waterside Five Oaks Road Slinfold West Sussex RH13 0RL

    Formation of hardstanding on a date four years previous (Lawful Development Certificate - Existing).

    7 Aug 2026 Lawful development
  • DC/26/1319 Awaiting decision

    Little Meadow Kerves Lane Horsham West Sussex RH13 6ES

    Erection of outbuilding for use as a garage/gym and workshop. (Lawful Development Certificate - Proposed).

    5 Aug 2026 Lawful development