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Dorlyn House London Road Ashington West Sussex RH20 3JT

DC/26/0131Full ApplicationRefused
Full

Refused on 8 April 2026

Council decision: Application RefusedDelegated (officer decision)2 reasons for refusal

Approximate site (title boundary)
Boundary © HM Land Registry, © Ordnance Survey · details

This information is subject to Crown copyright and database rights 2026 and is reproduced with the permission of HM Land Registry. The polygons (including the associated geometry, namely x, y co-ordinates) are subject to Crown copyright and database rights 2026 Ordnance Survey AC0000851063. Conditions of use.

Proposal

Conversion of existing 1no. 3 bedroom flat into 1no. 1 bedroom flat and 1no. 3 bedroom flat, conversion of the loft into habitable living space with the installation of 3no. rooflights, erection of a two storey and single storey rear extension, and alterations to fenestration.

Received
27 January 2026
Decision level
Delegated (officer decision)
Ward
West Chiltington, Thakeham and Ashington
Agent
RMR Architecture Ltd
  1. Received27 Jan
  2. Validated19 Feb
  3. Consult.19 Mar
  4. Target16 Apr
  5. Decided8 Apr

Decided in 48 days (council typically 56)

About this application

This is a full planning application for a single storey rear extension at Dorlyn House London Road Ashington West Sussex RH20 3JT. Horsham has handled 2,753 applications of this type. This one was decided in 71 days, 2 weeks longer than Horsham's typical decision time. There has been 1 other application at this address. In the past year there have been 110 applications across West Chiltington, Thakeham and Ashington. We hold 2,892 applications in total for the RH20 postcode area.

90% of full applications at Horsham District Council were approved. Across all application types, the council typically decides in about 8 weeks (median).

Based on decided applications received in the last 3 years.See what's approved near your address

Why it was refused

  1. The proposed development, by reason of its two storey scale and bulk extending across the full depth of the site, represents an overdevelopment of the site that would be harmful to the appearance of the site and the surrounding area, contrary to Policies 32 and 33 of the Horsham District Planning Framework (2015).
  2. The proposed development would result in a significant overbearing impact and loss of light and outlook to the neighbouring property at 3 Alicia Avenue by reason of its two storey scale and bulk extending across the full depth of the site, contrary to Policy 33 of the Horsham District Planning Framework (2015). Schedule of plans/documents: Plan Type Description Drawing Number Received Floor plan Proposed NONE 19.02.2026 Design & Access NONE 19.02.2026 Statement Elevation & Floor plan Existing Floor, Existing and NONE 27.01.2026 Location & Block plan NONE 27.01.2026 Horsham District Council, Albery House, Springfield Road, Horsham, West Sussex RH12 2GB

From the council's decision notice.

Application details

Postcode
RH20 3JT
Application type
Full Application
Scale / size
Small
Parish
Ashington PC

Planning application dates

Date validated
19 February 2026
Consultation expiry
19 March 2026
Neighbour consultation end
19 March 2026
Last date for comments
25 March 2026
Target decision date
16 April 2026

Applicant and agent

Agent
RMR Architecture Ltd
Agent address
5 St Johns Parade Alinora Crescent Goring-by-Sea BN12 4HJ

Planning decision

Statutory period
56 days

Additional information

Planning Portal ID
PP-14655739
Documents
12
Constraints
10

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

  • Flood zone 1: Low probability (rivers and sea)
Also checked, none recorded (24)

flood storage areas, conservation areas, listed buildings, Article 4 directions, tree preservation orders, green belt, scheduled monuments, World Heritage Sites, World Heritage Site buffer zones, registered parks and gardens, registered battlefields, Heritage at Risk entries, nutrient neutrality catchments, national parks, National Landscapes, SSSIs, Special Areas of Conservation, Special Protection Areas, Ramsar sites, ancient woodland, national nature reserves, local nature reserves, heritage coasts and brownfield registers.

A guide only, from official open data; it is not a planning search. Flood zones cover rivers and sea, not surface water.

Data © Crown copyright and others · sources and licences

Contains public sector information from planning.data.gov.uk (MHCLG and local planning authorities), licensed under the Open Government Licence v3.0. © Crown copyright and database right 2026.

© Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026. The Historic England GIS Data contained in this material was obtained on 2026-11-03. The most publicly available up to date Historic England GIS Data can be obtained from HistoricEngland.org.uk.

© Natural England copyright. Contains Ordnance Survey data © Crown copyright and database right 2026.

© Environment Agency copyright and/or database right 2026. All rights reserved. Flood Map for Planning, Open Government Licence v3.0.

Contains Ordnance Survey data © Crown copyright and database right 2026.

Source: Office for National Statistics licensed under the Open Government Licence v.3.0. Contains OS data © Crown copyright and database right 2026.

Source: Horsham

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