House extensions in Horsham

Horsham received 470 householder applications in the last 12 months - about 9 a week. Rear extensions and garage works are the most common. Of the 352 decided so far, 338 were approved. If you're planning your own, the applications below show what people nearby applied for and how the council decided.

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Showing 50 of 150 applications
Yesterday Registered DC/26/1329

4 Kingfisher Way Horsham West Sussex RH12 2LT

Demolition of existing conservatory and erection of a single storey rear extension, erection of a single storey side extension, conversion of garage i...

Householder Horsham
8 Sept 2026 Pending DC/26/1154

35 Three Acres Horsham West Sussex RH12 1RS

Erection of additional storey to provide first floor, erection of a ground floor rear extension with open side canopy and extension of ground floor fr...

Householder Horsham
8 Sept 2026 Pending DC/26/1437

Ivy Cottage Brighton Road Lower Beeding Horsham West Sussex RH13 6NH

Erection of single storey side and rear extensions.

Householder Horsham
8 Sept 2026 Pending DC/26/1193

8 Millais Horsham West Sussex RH13 6BS

Erection of a single storey rear and side extension and alteration to the fascia over the front elevation.

Householder Horsham
7 Sept 2026 Pending DC/26/0864

14 Ghyll Crescent Horsham West Sussex RH13 6BG

Erection of a balustrade around the existing rear balcony and installation of a frosted window to the north elevation.

Householder Horsham
7 Sept 2026 Pending DC/26/1173

60 Park Street Horsham West Sussex RH12 1BX

Conversion of existing dwelling into 2no. flats and erection of a single storey rear extension with associated alterations.

Full Application Horsham
7 Sept 2026 Pending DC/26/1340

37 Keats Close Horsham West Sussex RH12 5PL

Loft conversion with extension of barn-ends to gables, a rear dormer and front rooflights (Lawful Development Certificate - Proposed).

Certificate Proposed Lawful Use/Dev Horsham
7 Sept 2026 Pending DC/26/1293

10 Glendale Close Horsham West Sussex RH12 4GR

Conversion of the existing attached garage into habitable space and erection of a single-storey rear extension to provide a self-contained annexe.

Householder Horsham
7 Sept 2026 Pending DC/26/1316

Land at 512000 114372 Rock Road Washington West Sussex

Construction of field access and entrance drive, erection of post and rail fencing and planting of hedge to field frontage.

Full Application Horsham
2 Sept 2026 Awaiting decision NC/26/0026

Storrington County Primary School Spierbridge Road Storrington Pulborough West Sussex RH20 4PG

Erection of a single storey rear extension with associated works

Neighbouring Authority Consultation Horsham
2 Sept 2026 Registered DC/26/1300

6 Faithfull Crescent Storrington West Sussex RH20 4QY

Demolition of existing conservatory and erection of a single storey rear extension. (Lawful Development Certificate - Proposed).

Certificate Proposed Lawful Use/Dev Horsham
1 Sept 2026 Pending DC/26/1323

RM Area 11 (Moathouse) Moathouse Farm Rusper Road Horsham West Sussex RH12 4QR

Application for approval of Reserved Matters (layout, scale, appearance, means of internal access and landscaping) pursuant to Condition 5 of Outline ...

Approval of Reserved Matters Horsham
1 Sept 2026 Pending DC/26/1117

5 Fletchers Close Horsham West Sussex RH13 5DF

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

Certificate Proposed Lawful Use/Dev Horsham
1 Sept 2026 Pending DC/26/1314

30 West Street Horsham West Sussex RH12 1PB

Erection of an additional storey to the rear to provide two new dwellings (Class C3), with associated external alterations.

Full Application Horsham
28 Aug 2026 Pending DC/26/1333

33 Gaggle Wood Mannings Heath Horsham West Sussex RH13 6JR

Erection of a first floor side extension to create additional accommodation within the roofspace.

Householder Horsham
28 Aug 2026 Pending DC/26/1379

14 Millthorpe Road Horsham West Sussex RH12 4EP

Prior Approval for the erection of a single storey rear larger home extension, which would project 3.50m from the rear elevation, comprising a maximum...

Gen Permitted Development - Householder Horsham
27 Aug 2026 Registered DC/26/1374

29 Pound Lane Upper Beeding West Sussex BN44 3JB

Erection of a single storey rear extension

Householder Horsham
27 Aug 2026 Registered DC/26/1228

4 Castle Rise West Chiltington West Sussex RH20 2GT

Erection of a single storey rear extension and front porch, erection of a car barn, erection of a greenhouse in the rear garden, installation of 1no. ...

Householder Horsham
27 Aug 2026 Registered DC/26/1229

4 Castle Rise West Chiltington West Sussex RH20 2GT

Erection of a single storey rear extension and front porch, erection of a car barn, erection of a greenhouse in the rear garden, installation of 1no. ...

Listed Building Consent Horsham
27 Aug 2026 Pending DC/26/1238

The Forum Lower Tanbridge Way Horsham West Sussex

Replacement of existing timber decking to the external balconies and access walkways with proprietary aluminium decking system. (Lawful Development Ce...

Certificate Proposed Lawful Use/Dev Horsham
26 Aug 2026 Awaiting decision DC/26/0896

55 Brighton Road Horsham West Sussex RH13 6EZ

Removal of the existing built in airing cupboard and built in wardrobes and installation of a walk through wardrobe. Renovation of the existing ensuit...

Listed Building Consent Horsham
26 Aug 2026 Pending DC/26/1239

19 Hormare Crescent Storrington Pulborough West Sussex RH20 4QT

Erection of a single storey front extension with pitched roof, and first floor front dormer extension.

Householder Horsham
25 Aug 2026 Registered DC/26/1258

Batts School Lane Ashurst Steyning West Sussex BN44 4AY

Conversion of building to a single dwellinghouse, erection of detached garage with accommodation within the roof, provision of a garden area and addit...

Full Application Horsham
24 Aug 2026 Registered DC/26/1164

Oakwood Barn Danhill Farm Harbolets Road West Chiltington Pulborough West Sussex RH20 2LQ

Extension of residential curtilage and the erection of a greenhouse and summerhouse (Retrospective)

Full Application Horsham
21 Aug 2026 Approved NC/26/0025

Storrington County Primary School Spierbridge Road Storrington Pulborough West Sussex RH20 4PG

Installation of a temporary modular classroom building, with associated works including the installation of fencing (Variation of Condition 3 of plann...

Neighbouring Authority Consultation Horsham
20 Aug 2026 Registered DC/26/1150

Holbrook Surgery 9 Bartholomew Way Horsham West Sussex RH12 5JL

Erection of a single storey side extension.

Full Application Horsham
20 Aug 2026 Awaiting decision DC/26/1267

17 The Crescent Horsham West Sussex RH12 1NA

Demolition of existing single storey front extension and erection of replacement single storey front extension, erection of a single storey rear exten...

Householder Horsham
18 Aug 2026 Registered DC/26/1252

43 Oriel Road Horsham West Sussex RH12 6AG

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

Certificate Proposed Lawful Use/Dev Horsham
17 Aug 2026 Awaiting decision DC/26/1187

22 Forestfield Horsham West Sussex RH13 6DZ

Erection of a first floor side extension, installation of pitched roof to form extended front porch, replacement of all windows, removal of garage doo...

Householder Horsham
14 Aug 2026 Registered DC/26/1199

Priory Fields Monastery Lane Storrington West Sussex RH20 4LN

Demolition of existing timber shed and erection of replacement timber building.

Full Application Horsham
14 Aug 2026 Registered DC/26/1211

The Kings Head Church Street Rudgwick West Sussex RH12 3EB

Erection of an enlarged decking area, installation of external decorations, internal repairs and alterations. (Listed Building Consent).

Listed Building Consent Horsham
14 Aug 2026 Registered DC/26/1210

The Kings Head Church Street Rudgwick West Sussex RH12 3EB

Erection of an enlarged decking area, installation of external decorations, internal repairs and alterations. (Full Application).

Full Application Horsham
14 Aug 2026 Registered DC/26/1243

54 Queensway Horsham West Sussex RH13 5AY

Demolition of the existing conservatory, outbuildings and garage and erection of a single storey rear and side extension incorporating a concealed fla...

Householder Horsham
11 Aug 2026 Registered DC/26/1206

36 Rookwood Park Horsham West Sussex RH12 1UB

Erection of a single storey rear flat roof extension, formation of new patio door opening and front entrance door. (Lawful Development Certificate - P...

Certificate Proposed Lawful Use/Dev Horsham
7 Aug 2026 Registered DC/26/1265

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 ...

Certificate Proposed Lawful Use/Dev Horsham
7 Aug 2026 Registered DC/26/1147

Morlands Farm Wheatsheaf Road Henfield West Sussex BN5 9AT

Demolition of part of the existing barn and conversion of the remainder to a dwelling with associated alterations, garden, garage and parking.

Full Application Horsham
7 Aug 2026 Registered DC/26/1172

30 Laines Road Steyning West Sussex BN44 3LL

Conversion of garage into habitable living space, with the installation of 2no. windows to the front elevation, 1no. french doors to the rear elevatio...

Certificate Proposed Lawful Use/Dev Horsham
6 Aug 2026 Registered DC/26/1260

34 Staples Barn Henfield West Sussex BN5 9PN

Erection of front porch and alterations to front elevation, replacement of existing brickwork and tile hanging and replacement of existing flat roof t...

Householder Horsham
6 Aug 2026 Registered DC/26/1264

25 Springfield Park North Parade Horsham West Sussex RH12 2BF

Loft conversion with installation of front and rear roof lights.

Householder Horsham
6 Aug 2026 Registered DC/26/1198

Moorhead Farm Old Crawley Road Horsham West Sussex RH12 4RU

Partial demolition of the rear of the house and erection of a first floor rear and partial two storey rear extension. Replacement of windows.

Householder Horsham
6 Aug 2026 Registered DC/26/1237

Pengarth Nightingales West Chiltington Pulborough West Sussex RH20 2QT

Retention and alteration of existing decking.

Householder Horsham
5 Aug 2026 Awaiting decision DC/26/1319

Little Meadow Kerves Lane Horsham West Sussex RH13 6ES

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

Certificate Proposed Lawful Use/Dev Horsham
3 Aug 2026 Registered DC/26/1306

175 St Leonards Road Horsham West Sussex RH13 6BD

Erection of a single storey rear extension and associated alterations.

Householder Horsham
3 Aug 2026 Registered DC/26/1310

143 Rushams Road Horsham West Sussex RH12 2NY

Erection of roof extension and rear dormer to extend the existing loft conversion, and replacement of rear doors with bi-fold doors. (Lawful Developme...

Certificate Proposed Lawful Use/Dev Horsham
3 Aug 2026 Registered DC/26/1231

7 Truelove Gardens Billingshurst West Sussex RH14 9ZR

Erection of a detached garden building for use as a home office.

Householder Horsham
3 Aug 2026 Registered DC/26/1177

Park House Stane Street Slinfold Horsham West Sussex RH13 0QX

Erection of a part single, part two storey rear extension.

Householder Horsham
3 Aug 2026 Registered DC/26/0980

Blenheim Rise Lower Street Pulborough West Sussex RH20 2AA

Demolition of existing summer house and erection of a summer house and two composite deck areas.

Householder Horsham
31 Jul 2026 Registered DC/26/1223

1 Peskett Close Barns Green West Sussex RH13 0PY

Erection of a single storey rear extension.

Householder Horsham
30 Jul 2026 Awaiting decision DC/26/1218

19 Billingshurst Road Broadbridge Heath West Sussex RH12 3LB

Erection of a single storey rear extension, a first floor rear infill extension, conversion of loft into habitable living space, installation of a fro...

Householder Horsham
30 Jul 2026 Awaiting decision DC/26/0919

Slinfold Cricket Club Wicket Gardens Slinfold West Sussex RH13 0BP

Erection of a cricket score hut / storage shed. (Retrospective).

Full Application Horsham
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Frequently asked questions

When do you need planning permission for a house extension?
Single-storey rear extensions up to 4m (detached) or 3m (semi-detached / terraced) are usually permitted development. Two-storey extensions, anything in a conservation area, or larger projects almost always need a planning application.
What's the difference between planning permission and permitted development?
Permitted development rights let you build certain things without applying for planning permission, subject to specified limits. Anything outside those limits, whether taller, larger or in a protected area, needs full planning permission.
How long does a householder application take?
The statutory target is 8 weeks from validation. Most simple householder extensions are decided within that window; complex or contested cases, especially those drawing a lot of comments, can take longer.
Can I get email alerts for new extensions applications in Horsham?
Yes. Click "Set up alerts" on this page and you'll get a daily or weekly email listing every new extensions application published by Horsham. You can also narrow the alert to a postcode, street, or drawn area.

We check Horsham's planning portal daily. New extensions applications appear here within a day of being published.