House extensions in South Downs

South Downs received 164 householder applications in the last 12 months - about 3 a week. Rear extensions and garage works are the most common. Of the 71 decided so far, 61 were approved. If you're planning your own, the applications below show what people nearby applied for and how the council decided.

88 last 90 days
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29 last 30 days
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Showing 50 of 88 applications
SDNP/26/02723/ADJAUT 5 Jul 2026 Application in Progress

Coastland Hillside and Upland Buildings Varley Park Halls of Residence Coldean Lane Brighton BN1 9GR

Adjoining Authority Consultation - BH2026/01031 - Removal of combustible timber cladding, replacement with noncombustible fibre cement cladding panels...

South Downs 5 Jul 2026
SDNP/26/02615/HOUS 3 Jul 2026 Application in Progress

Little Washbrook Farmhouse Brighton Road Hurstpierpoint West Sussex BN6 9EF

Erection of a single storey rear extension

South Downs 3 Jul 2026
SDNP/26/02614/HOUS 3 Jul 2026 Application in Progress

Wepham, Arundel View The Street Burpham West Sussex BN18 9RA

To erect a 8 ft high by 8 ft wide fence at the bottom of the garden on the right hand side

South Downs 3 Jul 2026
SDNP/26/02610/LDP 3 Jul 2026 Application in Progress

Ivy Farm Lodge Lane Ditchling East Sussex BN6 8XP

Rear single storey extension, front porch and roof lights front and rear.

South Downs 3 Jul 2026
SDNP/26/02587/HOUS 2 Jul 2026 Application in Progress

29 Kings Ride Alfriston East Sussex BN26 5XP

Single storey side link extension, single storey rear extension and fenestration alterations

Householder South Downs 2 Jul 2026
SDNP/26/02597/LIS 2 Jul 2026 Application in Progress

Madehurst Lodge Madehurst Road Madehurst West Sussex BN18 0NL

Minor internal alterations and installation of timber framed pergola in courtyard

South Downs 2 Jul 2026
SDNP/26/02596/FUL 2 Jul 2026 Application in Progress

Madehurst Lodge Madehurst Road Madehurst West Sussex BN18 0NL

Minor internal alterations and installation of timber framed pergola in courtyard

South Downs 2 Jul 2026
SDNP/26/02713/ADJAUT 2 Jul 2026 Decided

67 First Avenue Worthing West Sussex BN14 9NP

Adjoining Authority Consultation - AWDM/0674/26 - Single storey summerhouse in rear garden.

South Downs 2 Jul 2026
SDNP/26/02600/HOUS 2 Jul 2026 Application in Progress

9A Hurst Cottages East Street Amberley West Sussex BN18 9NP

Single storey side extension with pitched roof matching existing.

South Downs 2 Jul 2026
SDNP/26/02576/HOUS 1 Jul 2026 Application in Progress

35 St Annes Crescent Lewes East Sussex BN7 1SB

Fenestration alterations and rear juliet balcony

Householder South Downs 1 Jul 2026
SDNP/26/02571/HOUS 1 Jul 2026 Application in Progress

94 Malling Street Lewes East Sussex BN7 2RJ

Single storey rear extension

Householder South Downs 1 Jul 2026
SDNP/26/02527/LDP 29 Jun 2026 Application in Progress

26 Lewes Road Ditchling East Sussex BN6 8TU

Proposed rear extension

Lawful Development Cert (Proposed) South Downs 29 Jun 2026
SDNP/26/02524/LDP 26 Jun 2026 Application in Progress

Old Farm Farm Lane Ditchling East Sussex BN6 8UN

Single storey side extension

Lawful Development Cert (Proposed) South Downs 26 Jun 2026
SDNP/26/02480/HOUS 24 Jun 2026 Application in Progress

Wilmots Mill Lane Wickham Hampshire PO17 5AN

Erection of incidental garden kitchen

Householder South Downs 24 Jun 2026
SDNP/26/02458/HOUS 23 Jun 2026 Application in Progress

38 Nevill Road Lewes East Sussex BN7 1PQ

Erection of a two storey extension with associated alterations.

Householder South Downs 23 Jun 2026
SDNP/26/02452/LIS 23 Jun 2026 Application in Progress

Frensham Cottage The Village Berwick East Sussex BN26 6SP

Alterations and repairs to the staircase and associated stair trimmers in the 20th century extension

Listed Building South Downs 23 Jun 2026
SDNP/26/02455/LIS 23 Jun 2026 Application in Progress

Graziers Alton Road West Meon Hampshire GU32 1JF

Repairs to boundary wall.

Listed Building South Downs 23 Jun 2026
SDNP/26/02537/ADJAUT 23 Jun 2026 Decided

174 Downsway Southwick West Sussex BN42 4WF

Adjoining Authority Consultation - Adur & Worthing - AWDM/0768/26 - Hip to gable roof extension, extension of front and rear dormers, extension of por...

Adjoining Authority Consultation South Downs 23 Jun 2026
SDNP/26/02430/FUL 22 Jun 2026 Application in Progress

Garden Flat 15 Grange Road Lewes East Sussex BN7 1TS

Demolition of existing conservatory and replacement with single storey extension. Replacement of existing upvc windows/doors with alumnium framed wind...

Full Application South Downs 22 Jun 2026
SDNP/26/02407/LIS 18 Jun 2026 Application in Progress

Lathams Barn East Street Amberley West Sussex BN18 9NN

Repairs to 3 no. existing windows (application related to SDNP/26/00647/DCOND).

Listed Building South Downs 18 Jun 2026
SDNP/26/02381/HOUS 17 Jun 2026 Application in Progress

2 Hyde Cottages Fawley Lane Morestead Hampshire SO21 1NA

Construction of a two-storey side extension together with associated works to the existing dwelling and a carport / store

Householder South Downs 17 Jun 2026
SDNP/26/02384/LIS 17 Jun 2026 Application in Progress

Mill Cottage College Walk Winchester Hampshire SO23 9NG

Change of use from residential (Class C3) to offices (Class E(g)(i)), Erection of fence to boundary, Removal of sections of internal wall on ground fl...

Listed Building South Downs 17 Jun 2026
SDNP/26/02383/FUL 17 Jun 2026 Application in Progress

Mill Cottage College Walk Winchester Hampshire SO23 9NG

Change of use from residential (Class C3) to offices (Class E(g)(i)), Erection of fence to boundary, Removal of sections of internal wall on ground fl...

Full Application South Downs 17 Jun 2026
SDNP/26/02364/FUL 16 Jun 2026 Application in Progress

Weycroft High Street Soberton Hampshire SO32 3PN

Demolition of the existing dwelling and erection of a replacement dwelling, with detached carport and store, landscaping and associated works.

Full Application South Downs 16 Jun 2026
SDNP/26/02342/HOUS 15 Jun 2026 Application in Progress

Freeland Cottage High Street Meonstoke Hampshire SO32 3NH

Removal of existing render to reveal and restore original flintwork and brick detailing, replacement of windows with heritage-style sash windows, remo...

Householder South Downs 15 Jun 2026
SDNP/26/02326/HOUS 12 Jun 2026 Application in Progress

16 Silverdale Coldwaltham West Sussex RH20 1LJ

Replace rear uPVC conservatory with a single-storey rear extension with two rooflights. Add a box dormer to the main roof at the rear, insert 3 roofli...

Householder South Downs 12 Jun 2026
SDNP/26/02339/LIS 12 Jun 2026 Application in Progress

50 East End Lane Ditchling East Sussex BN6 8UP

Conversion of existing rear outrigger roof space to provide an additional bedroom with associated internal alterations, including the insertion of a r...

Listed Building South Downs 12 Jun 2026
SDNP/26/02315/LIS 12 Jun 2026 Application in Progress

The Old Vicarage West Street Alfriston East Sussex BN26 5UY

Internal and fenestration alterations and repairs to Vicarage and its associated garden walls

Listed Building South Downs 12 Jun 2026
SDNP/26/02285/HOUS 10 Jun 2026 Application in Progress

Old Postings The Square Amberley West Sussex BN18 9SR

Installation of porch canopy over entrance door, 2no stone steps to front entrance and vertical slate hanging to existing first floor front windows

Householder South Downs 10 Jun 2026
SDNP/26/02344/ADJAUT 9 Jun 2026 Decided

The Old Forge Shillinglee Road Shillinglee Chiddingfold Godalming Surrey GU8 4SY

Adjoining Authority Consultation - Change of use of barn to single dwelling and amendments to existing annex - PS/26/01003/FUL

Adjoining Authority Consultation South Downs 9 Jun 2026
SDNP/26/02267/LIS 9 Jun 2026 Application in Progress

1 Old Farm Cottages Martyr Worthy Road Martyr Worthy Hampshire SO21 1DU

New front and back doors and removal of non-original partition

Listed Building South Downs 9 Jun 2026
SDNP/26/02272/HOUS 9 Jun 2026 Application in Progress

22 De Montfort Road Lewes East Sussex BN7 1SR

Alterations to existing loft conversion including repositioning of staircase, the installation of a dormer to side roof slope and widening of rear dor...

Householder South Downs 9 Jun 2026
SDNP/26/02253/LIS 8 Jun 2026 Application in Progress

Plumpton Place Ditchling Road Plumpton East Sussex BN7 3AF

Refurbishment of the lodges including introduction of new heating system and improved floor insulation with associated fenestration repairs and altera...

Listed Building South Downs 8 Jun 2026
SDNP/26/02244/HOUS 8 Jun 2026 Application in Progress

Stable View Underhill Lane Westmeston East Sussex BN6 8XG

Conversion of existing loft storage to habitable space

Householder South Downs 8 Jun 2026
SDNP/26/02205/CND 4 Jun 2026 Application in Progress

Stable Cottage Garrison Hill Droxford Hampshire SO32 3QL

Application Reference Number: SDNP/23/03525/CND Date of Decision: 07/09/2023 removal of Condition 3 - requiring family member to use annex ( former re...

Removal or Variation of a Condition South Downs 4 Jun 2026
SDNP/26/02192/LIS 3 Jun 2026 Application in Progress

80 East End Lane Ditchling East Sussex BN6 8UR

Retrospective internal works to include the creation of 2no internal doorways and covering of 2no doorways to one side only

Listed Building South Downs 3 Jun 2026
SDNP/26/02168/HOUS 2 Jun 2026 Application in Progress

Creek Cottage Coombes Road Lancing West Sussex BN15 0RJ

Proposed detached garage.

Householder South Downs 2 Jun 2026
SDNP/26/02148/HOUS 2 Jun 2026 Application in Progress

61 The Avenue Lewes East Sussex BN7 1QU

Replace the single glazed timber sashes on the front and side elevations with slim 16mm double glazed timber sashes to match. Adjustments to the fenes...

Householder South Downs 2 Jun 2026
SDNP/26/02132/LIS 29 May 2026 Application in Progress

Kilmeston Manor Kilmeston Road Kilmeston Hampshire SO24 0NL

Minor external re-landscaping of existing east car-park to become a formal garden, proposed new gates and piers and restoration of existing gates, pie...

Listed Building South Downs 29 May 2026
SDNP/26/02131/HOUS 29 May 2026 Application in Progress

Kilmeston Manor Kilmeston Road Kilmeston Hampshire SO24 0NL

Minor external re-landscaping of existing east car-park to become a formal garden, proposed new gates and piers and restoration of existing gates, pie...

Householder South Downs 29 May 2026
SDNP/26/02117/CND 29 May 2026 Application in Progress

Seabeach Farm A285 Thicket Lane To Eartham Lane Eartham West Sussex PO18 0LX

Erection of replacement single storey rear extension and associated works. (Variation of condition 2 of permission SDNP/25/02585/HOUS - relocate kitch...

Removal or Variation of a Condition South Downs 29 May 2026
SDNP/26/02260/CND 29 May 2026 Application in Progress

Seabeach House A285 Thicket Lane to Eartham Lane Eartham West Sussex PO18 0LX

Erection of replacement single storey rear extension and associated works. (Variation of condition 2 of permission SDNP/25/02586/LIS - relocate kitche...

Removal or Variation of a Condition South Downs 29 May 2026
SDNP/26/02083/LIS 28 May 2026 Application in Progress

The Platt Sheepwash Elsted West Sussex GU29 0LA

Refurbish existing garage including new roof tiles and infil 1 no. existing opening (with timber gate) fronting Elsted Road with wall to match existin...

Listed Building South Downs 28 May 2026
SDNP/26/02084/HOUS 28 May 2026 Application in Progress

The Chapel Baybridge Lane Owslebury Hampshire SO21 1JN

Single storey extension to the existing chapel including patio and retaining wall landscaping works externally.

Householder South Downs 28 May 2026
SDNP/26/02074/LIS 27 May 2026 Application in Progress

Manor House High Street Droxford Hampshire SO32 3PA

Single storey extension to South-East corner of Manor House

Listed Building South Downs 27 May 2026
SDNP/26/02073/HOUS 27 May 2026 Application in Progress

Manor House High Street Droxford Hampshire SO32 3PA

Single storey extension to South-East corner of Manor House

Householder South Downs 27 May 2026
SDNP/26/01999/HOUS 21 May 2026 Application in Progress

10 Churchfields Twyford Hampshire SO21 1NN

(AMENDED PLANS 11.06.2026) Single storey rear replacement extension, loft conversion with dormers

Householder South Downs 21 May 2026
SDNP/26/02010/LDP 21 May 2026 Application in Progress

46 Fitzjohns Road Lewes East Sussex BN7 1PR

Conversion of existing attached garage into habitable accommodation to include replacement of existing flat roof with pitched roof

Lawful Development Cert (Proposed) South Downs 21 May 2026
SDNP/26/01956/HOUS 19 May 2026 Application in Progress

Orchard House Wellgreen Lane Kingston East Sussex BN7 3NP

Removal and replacement of existing dormers and erection of side extension to garage building

Householder South Downs 19 May 2026
SDNP/26/01941/HOUS 18 May 2026 Application in Progress

Starfield House Holden Lane Beauworth Hampshire SO24 0PB

Proposed swimming pool.

Householder South Downs 18 May 2026
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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 — taller, larger, 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 with objections) 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.