House extensions in South Downs

South Downs received 1,081 householder applications in the last 12 months - about 21 a week. Rear extensions and garage works are the most common. Of the 703 decided so far, 644 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 258 applications
23 Oct 2026 Application in Progress SDNP/26/03834/HOUS

23 Orwell Road Petersfield Hampshire GU31 4LQ

Single storey rear extension

Householder South Downs
21 Oct 2026 Application in Progress SDNP/26/03979/LDP

Philliswood Cottage Hooksway Lane Hooksway Elsted West Sussex PO18 9JZ

Single-storey rear conservatory extension.

Lawful Development Cert (Proposed) South Downs
21 Oct 2026 Application in Progress SDNP/26/03160/LIS

Wiston House Steyning Road Wiston West Sussex BN44 3DZ

Phased works to renew and repair the existing roofs to Wiston House. This includes renewal and repairs of slate, Horsham stone roofs, lead flat roofs,...

Listed Building South Downs
21 Oct 2026 Application in Progress SDNP/26/03141/HOUS

Flat 1, Brook House 42 Barham Road Petersfield Hampshire GU32 3AU

Mobility shelter shed

Householder South Downs
20 Oct 2026 Application in Progress SDNP/26/04064/HOUS

2 Sportsmans Cottages Rackham Road Amberley West Sussex BN18 9NR

Installation of 1no new window to front and 8no solar panels to roof

Householder South Downs
20 Oct 2026 Application in Progress SDNP/26/03945/HOUS

37 Hereward Way Lewes East Sussex BN7 2HW

New window to side elevation, replacement of existing windows / doors and new rooflights

Householder South Downs
20 Oct 2026 Application in Progress SDNP/26/03850/LIS

Upperton Farm Church Lane Bury West Sussex RH20 1PB

Single storey rear addition and replacement porch. Various internal alterations (installation of cavity drain membrane to basement, underfloor insulat...

Listed Building South Downs
20 Oct 2026 Application in Progress SDNP/26/03849/HOUS

Upperton Farm Church Lane Bury West Sussex RH20 1PB

Single storey rear addition and replacement porch. Various external alterations and repairs to fenestration, roof, walls, rainwater goods, landscaping...

Householder South Downs
19 Oct 2026 Application in Progress SDNP/26/03560/LIS

8 Dean Lane End Forestside Stoughton West Sussex PO9 6EJ

Removal of fireplace surround within the ground floor reception room, installation of wood burning stove within existing chimney opening, installation...

Listed Building South Downs
19 Oct 2026 Application in Progress SDNP/26/04035/LIS

Porch House School Hill Soberton Hampshire SO32 3PF

Installation of flue liner, stove and small changes to chimney stack appearance to revert back to original design

Listed Building South Downs
16 Oct 2026 Application in Progress SDNP/26/04025/HOUS

Ashurst House Cottage Waltham Park Road Coldwaltham West Sussex RH20 1LY

Installation of a pre constructed ancillary building, sauna and hot tub,

Householder South Downs
16 Oct 2026 Application in Progress SDNP/26/04011/FUL

Courthill Farm Buildings Court Hill Farm Road Slindon Arundel West Sussex BN18 0RJ

Extension to an existing deer chiller/larder

Full Application South Downs
16 Oct 2026 Application in Progress SDNP/26/03753/FUL

Badgers Tavern Station Road Petworth West Sussex GU28 0JF

Demolition of rear covered area in courtyard and replacement with a conservatory extension.

Full Application South Downs
16 Oct 2026 Application in Progress SDNP/26/03889/LIS

The Old Rectory Gorham's Lane Telscombe Village East Sussex BN7 3HY

Refurbishment of existing kitchen , utility and dining area spaces with recovering of small area of asphalt roof with lead roof.

Listed Building South Downs
16 Oct 2026 Application in Progress SDNP/26/02829/LIS

4 Albion Street Lewes East Sussex BN7 2ND

Part retrospective repairs, decoration and like-for-like upgrade of materials (electrics/fire safety)

Listed Building South Downs
16 Oct 2026 Application in Progress SDNP/26/02828/HOUS

4 Albion Street Lewes East Sussex BN7 2ND

Part retrospective repairs, decoration and like-for-like upgrade of materials (electrics/fire safety)

Householder South Downs
15 Oct 2026 Application in Progress SDNP/26/04000/HOUS

Ashurst House Cottage Waltham Park Road Coldwaltham West Sussex RH20 1LY

Construction of a single storey extension, removal of chimney, conversion of flat roof to pitch and alterations to the windows including 2 dormers.

Householder South Downs
15 Oct 2026 Application in Progress SDNP/26/03991/HOUS

Police House A272 Chithurst Lane To Fitzhall Road Trotton West Sussex GU31 5ES

Proposed two storey extension.

Householder South Downs
15 Oct 2026 Application in Progress SDNP/26/03988/LDP

53 Hawkenbury Way Lewes East Sussex BN7 1LT

Removal of the existing uPVC conservatory and erection of a single-storey rear extension; installation of four roof windows to the existing main roof ...

Lawful Development Cert (Proposed) South Downs
15 Oct 2026 Application in Progress SDNP/26/03722/HOUS

8 Greensand Way Petersfield Hampshire GU31 4FS

Single storey rear extension

Householder South Downs
14 Oct 2026 Application in Progress SDNP/26/03965/FUL

Jolly Farmer Blacknest Road Binsted Alton Hampshire GU34 4QD

Retrospective application for extensions to the existing building to provide a cold room and cellar; construction of a new bin, empty barrel and bottl...

Full Application South Downs
14 Oct 2026 Application in Progress SDNP/26/03639/LIS

Weavers The Street Lodsworth West Sussex GU28 9BZ

Demolition of existing detached outbuilding to allow for a new studio and garden goom.

Listed Building South Downs
14 Oct 2026 Application in Progress SDNP/26/03638/HOUS

Weavers The Street Lodsworth West Sussex GU28 9BZ

Demolition of existing detached outbuilding to allow for a new studio and garden room.

Householder South Downs
14 Oct 2026 Application in Progress SDNP/26/03846/HOUS

Westway West Street Rogate West Sussex GU31 5HQ

Proposed remodelling of existing house with alterations to fenestration including relocation of door opening on south elevation. Construction of new c...

Householder South Downs
14 Oct 2026 Application in Progress SDNP/26/03821/LDP

30 Mountfield Road Lewes East Sussex BN7 2UR

Erection of single storey front porch and conservatory to rear

Lawful Development Cert (Proposed) South Downs
14 Oct 2026 Application in Progress SDNP/26/01892/HOUS

Paupers Cottage Workhouse Lane East Meon Petersfield Hampshire GU32 1PF

New porch, new garden room, new chimney pot and solar panels following demolition of porch.

Householder South Downs
14 Oct 2026 Application in Progress SDNP/26/03479/HOUS

23 Syers Road Liss Hampshire GU33 7DH

Proposed part single, part two storey, front, side and rear extension works following removal of the current outbuilding to form additional habitable ...

Householder South Downs
14 Oct 2026 Application in Progress SDNP/26/03294/HOUS

20 Readon Close Petersfield Hampshire GU31 4AN

Addition of 6.5mx3m lean to shed in the garden.

Householder South Downs
13 Oct 2026 Application in Progress SDNP/26/03562/HOUS

Tanners Love Lane Petersfield Hampshire GU31 4BW

The proposed development comprises of the installation of a natural pool and associated biological regeneration zone within the residential property. ...

Householder South Downs
13 Oct 2026 Application in Progress SDNP/26/02462/HOUS

22 The Leys Singleton West Sussex PO18 0HR

Removal of existing conservatory and construction of single storey rear extension. Infill extension to and conversion of existing garage to habitable ...

Householder South Downs
13 Oct 2026 Application in Progress SDNP/26/03464/FUL

1 Slate Cottages East Harting Street East Harting West Sussex GU31 5LZ

Demolition of existing greenhouse and the erection of a detached garage.

Full Application South Downs
13 Oct 2026 Application in Progress SDNP/26/03946/HOUS

62 Houndean Rise Lewes East Sussex BN7 1EJ

Erection of a single storey rear/side extension (renewal of SDNP/23/03888/HOUS)

Householder South Downs
13 Oct 2026 Application in Progress SDNP/26/03944/HOUS

29 Morris Road Lewes East Sussex BN7 2AT

Replacement roof to an existing rear infill extension, new conservation-style rooflights and new bifold doors to rear elevation

Householder South Downs
13 Oct 2026 Application in Progress SDNP/26/03665/HOUS

Marden House East Harting Street East Harting West Sussex GU31 5LY

Single-storey extension on east elevation and alterations to outbuilding for use as gym/storage/plant room/WC, including re-roofing and replacement of...

Householder South Downs
13 Oct 2026 Application in Progress SDNP/26/03405/FUL

School House School Lane Sheet Petersfield Hampshire GU32 2AS

Creation of a new vehicular access with a dropped kerb and construction of a permeable front driveway to provide off-road parking for a single dwellin...

Full Application South Downs
12 Oct 2026 Application in Progress SDNP/26/03926/HOUS

62 South Way Lewes East Sussex BN7 1LY

Erection of front porch, single storey side extension, detached single storey garden room and new vehicle crossover and on-site parking bay

Householder South Downs
12 Oct 2026 Application in Progress SDNP/26/03726/HOUS

Forest Mead Linchmere Common Road Linchmere West Sussex GU27 3NE

Conversion of loft space to habitable accommodation with 2 no. dormers and 5 no. rooflights; alterations to external fenestration including replacemen...

Householder South Downs
12 Oct 2026 Application in Progress SDNP/26/03819/HOUS

8 Common Lane Ditchling East Sussex BN6 8TJ

Erection of an oak framed garage

Householder South Downs
12 Oct 2026 Application in Progress SDNP/26/03597/HOUS

6 Yarborough Terrace The Alley Stedham West Sussex GU29 0NP

Single-storey rear extension and addition of 1 no. ground floor window to north elevation.

Householder South Downs
12 Oct 2026 Application in Progress SDNP/26/03778/HOUS

4 Smugglers Close Alfriston East Sussex BN26 5TG

Erection of front porch to replace existing

Householder South Downs
12 Oct 2026 Application in Progress SDNP/26/03617/FUL

Barrow Hill Farm, Barrow Hill Barns Barrowhill Farm Lane Ramsdean Petersfield Hampshire GU32 1RW

Swimming pool and wellness barn ancillary to the existing holiday accommodation business.

Full Application South Downs
9 Oct 2026 Application in Progress SDNP/26/03922/CND

Meadow Cottage Bex Lane Heyshott West Sussex GU29 0DH

Alterations to roof and small infill extension (S73 variation of condition 2 of permission SDNP/25/02840/HOUS - Amendments to first floor layout and s...

Removal or Variation of a Condition South Downs
9 Oct 2026 Application in Progress SDNP/26/03921/LIS

37 High Street Lewes East Sussex BN7 2LU

Repainting of front elevation and 2no front sash windows to match. Repairs to front roof and repairs to render and slate at party wall

Listed Building South Downs
9 Oct 2026 Application in Progress SDNP/26/03920/HOUS

37 High Street Lewes East Sussex BN7 2LU

Repainting of front elevation and 2no front sash windows to match. Repairs to front roof and repairs to render and slate at party wall

Householder South Downs
9 Oct 2026 Application in Progress SDNP/26/03906/LIS

Winton Barn Winton Street Alfriston East Sussex BN26 5UJ

Internal alterations to Winton Barn and Coach House.

Listed Building South Downs
9 Oct 2026 Application in Progress SDNP/26/03645/HOUS

5 Raughmere Court Raughmere Drive Lavant West Sussex PO18 0DT

Replacement of existing conservatory with single-storey rear extension.

Householder South Downs
8 Oct 2026 Application in Progress SDNP/26/03894/HOUS

1 Dean Barn Dean Barn Lane Buriton Petersfield Hampshire GU31 5SL

Single-storey rear and side extension, with alterations to the existing building and associated landscaping.

Householder South Downs
8 Oct 2026 Application in Progress SDNP/26/03771/HOUS

38 North Way Lewes East Sussex BN7 1DT

Replacement of the existing tile hung facade with external wall insulation and rendered finish.

Householder South Downs
8 Oct 2026 Application in Progress SDNP/26/03379/HOUS

Woodstock 13A The Avenue Petersfield Hampshire GU31 4JQ

External alterations to roof, including provision of solar panels, doors and fenestrations following removal of chimney and loft dormer window

Householder South Downs
7 Oct 2026 Application in Progress SDNP/26/03857/LIS

Exceat Farm House East Dean Road Exceat East Sussex BN25 4AD

Alter existing single wc to form 2 unisex wcs

Listed Building South Downs
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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 South Downs?
Yes. Click "Set up alerts" on this page and you'll get a daily or weekly email listing every new extensions application published by South Downs. You can also narrow the alert to a postcode, street, or drawn area.

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