House extensions in Lewes

Lewes received 221 householder applications in the last 12 months - about 4 a week. Rear extensions and garage works are the most common. Of the 183 decided so far, 172 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 49 of 49 applications
16 Oct 2026 Awaiting decision LW/26/0454

18 Springett Avenue Ringmer East Sussex BN8 5HE

Erection of garden workshop as an extension to existing garage

Householder Planning Permission Lewes
14 Oct 2026 Awaiting decision LW/26/0464

40 Wicklands Avenue Saltdean East Sussex BN2 8EP

Hip to gable loft conversion into habitable space, addition of 1 no. rear dormer, addition of 8 no. roof lights, side extension and associated interna...

Certificate of Lawful Use/Dev (Proposed) Lewes
14 Oct 2026 Awaiting decision LW/26/0354

8 Downsview Drive Wivelsfield East Sussex RH17 7RW

Construction of an outbuilding and replacement fences with associated landscaping

Householder Planning Permission Lewes
9 Oct 2026 Awaiting decision LW/26/0519

13 Northdown Road Newhaven East Sussex BN9 9JB

Prior Notification under The Town and Country Planning (General Permitted Development) (England) Order 2015 (as amended) - Schedule 2, Part 1, Class A...

GPD - Extensions Lewes
9 Oct 2026 Awaiting decision LW/26/0426

Winchmore Cooksbridge Road Barcombe East Sussex BN8 5TJ

Extension of the existing dropped kerb

Householder Planning Permission Lewes
9 Oct 2026 Awaiting decision LW/26/0444

2 South View Terrace Heighton Road South Heighton East Sussex BN9 0JL

Replacement of the existing detached outbuilding in the rear garden with a single-storey outbuilding to be used for holiday let use

Planning Application Lewes
8 Oct 2026 Approved 23 Oct LW/26/0449

Newhaven Downs House Church Hill Newhaven East Sussex BN9 9HH

Replacement of existing doors and windows

Certificate of Lawful Use/Dev (Proposed) Lewes
8 Oct 2026 Awaiting decision LW/26/0437

98 Arundel Road Peacehaven East Sussex BN10 8RG

Replacement of existing structure with single storey side extension, conversion of existing garage into habitable space and alterations to fenestratio...

Householder Planning Permission Lewes
2 Oct 2026 Awaiting decision LW/26/0433

Annexe Berrymead Spatham Lane Westmeston East Sussex BN6 8XL

Extension to the existing building to create 1no. two-bedroom dwellinghouse (Class C3), creation of driveway and domestic curtilage

Planning Application Lewes
25 Sept 2026 Awaiting decision LW/26/0432

42 Kingsmead Seaford East Sussex BN25 2HA

Erection of single storey side and rear extension, double storey rear extension and associated roof modifications

Householder Planning Permission Lewes
25 Sept 2026 Awaiting decision LW/26/0429

5 Coppards Bridge Cinder Hill Chailey East Sussex BN8 4HS

Re-tiling front/rear roofs, addition of loft insulation and structural timber replacement

Listed Building Consent Application Lewes
24 Sept 2026 Awaiting decision LW/26/0424

Tye Chalet Tye Close Saltdean East Sussex BN2 8DY

Erection of single storey front/side extensions, addition of first floor to the existing dwelling, modifications to roof, alterations to fenestration ...

Householder Planning Permission Lewes
22 Sept 2026 Awaiting decision LW/26/0423

47 Broomfield Avenue Telscombe Cliffs East Sussex BN10 7AL

Replacement of existing conservatory with single-storey rear/side extension, addition of front porch and alterations to fenestration

Householder Planning Permission Lewes
21 Sept 2026 Awaiting decision LW/26/0421

17 Kingston Close Seaford East Sussex BN25 4NF

Extension and conversion of existing garage into a single storey extension with addition of front porch

Householder Planning Permission Lewes
18 Sept 2026 Awaiting decision LW/26/0415

2 Broadlands Trinity Field Ringmer East Sussex BN8 5WR

Erection of a detached outbuilding in the rear garden

Householder Planning Permission Lewes
17 Sept 2026 Approved 23 Oct LW/26/0409

Flat 1 Crossways Haywards Heath Road North Chailey East Sussex BN8 4ET

Single storey front extension

Planning Application Lewes
17 Sept 2026 Awaiting decision LW/26/0420

28 The Cloisters Newhaven East Sussex BN9 9LW

Garage conversion to bedroom and storage area

Certificate of Lawful Use/Dev (Proposed) Lewes
16 Sept 2026 Awaiting decision LW/26/0411

2 Flint Cottages South Street South Chailey East Sussex BN8 4BQ

Detached 3 bay garage with 1 bay as secure store, office accommodation in roof space

Householder Planning Permission Lewes
16 Sept 2026 Awaiting decision LW/26/0408

5 Woodlands Close Peacehaven East Sussex BN10 7SF

Single storey rear extension

Householder Planning Permission Lewes
14 Sept 2026 Approved 19 Oct LW/26/0403

Peaceways The Broyle Ringmer East Sussex BN8 5AJ

Replacement and/or infilling of existing door and windows at all elevations and internal alterations

Planning Application Lewes
10 Sept 2026 Approved 15 Oct LW/26/0399

32 Brambletyne Avenue Saltdean East Sussex BN2 8EJ

Demolition of existing rear conservatory and deck, replacement with single storey rear extension and raised deck

Householder Planning Permission Lewes
8 Sept 2026 Awaiting decision LW/26/0355

Tin Tabernacle Cooksbridge Road Barcombe East Sussex BN8 5TJ

Replacement of the existing 1.2m-high swing gate with a 1.8 m-high sliding gate, installation of a new pedestrian access gate, and associated landscap...

Householder Planning Permission Lewes
8 Sept 2026 Awaiting decision LW/26/0397

Oakwood House 6 Warrenwood North Chailey East Sussex BN8 4JR

Erection of a detached double garage

Householder Planning Permission Lewes
7 Sept 2026 Awaiting decision LW/26/0469

10 Chyngton Road Seaford East Sussex BN25 4HH

Addition of single-storey side infill extension, replacement roof (flat) over existing side extension and alterations to fenestration

Planning Application Lewes
7 Sept 2026 Awaiting decision LW/26/0468

10 Chyngton Road Seaford East Sussex BN25 4HH

Addition of single-storey side infill extension, replacement roof (pitched) over existing side extension and alterations to fenestration

Householder Planning Permission Lewes
7 Sept 2026 Awaiting decision LW/26/0467

24 Downsview Road Seaford East Sussex BN25 4PT

Replacement of existing conservatory with single storey rear extension, addition of 4 no. rooflights, erection of detached single-storey outbuilding a...

Householder Planning Permission Lewes
7 Sept 2026 Approved 13 Oct LW/26/0457

262 Arundel Road West Peacehaven East Sussex BN10 7PP

Prior Notification under The Town and Country Planning (General Permitted Development) (England) Order 2015 (as amended) - Schedule 2, Part 1, Class A...

GPD - Extensions Lewes
4 Sept 2026 Approved 12 Oct LW/26/0394

The Copse Hundred Acre Lane Wivelsfield East Sussex RH17 7RS

Replacement of existing single-storey rear extension with new, replacement of existing front porch and roof extension to provide access to an existing...

Householder Planning Permission Lewes
2 Sept 2026 Approved 21 Oct LW/26/0396

Sunnycroft Mill Lane Chailey East Sussex BN8 4PU

Conversion of the existing detached garage to provide ancillary accommodation, including addition of rear extension, new roof and alterations to fenes...

Householder Planning Permission Lewes
1 Sept 2026 Awaiting decision LW/26/0455

14 Green Walk Seaford East Sussex BN25 4LY

Two storey side extension, single storey rear extension, single storey infill extension, integration of solar pv array at first floor level, modificat...

Householder Planning Permission Lewes
27 Aug 2026 Approved 5 Oct LW/26/0382

40 Tyedean Road Telscombe Cliffs East Sussex BN10 7AU

Extension to existing detached garage to create a granny annexe and replacement of existing rear conservatory with single-storey extension

Householder Planning Permission Lewes
26 Aug 2026 Approved 8 Oct LW/26/0452

14 Hawth Park Road Seaford East Sussex BN25 2RE

Loft conversion into habitable space, addition of 1 no. rear dormer, addition of rooflight at front

Certificate of Lawful Use/Dev (Proposed) Lewes
20 Aug 2026 Refused 30 Sep LW/26/0310

50 Cornwall Avenue Peacehaven East Sussex BN10 8SG

Erection of 1no double garage

Planning Application Lewes
18 Aug 2026 Approved 13 Oct LW/26/0383

11 Lullington Close Seaford East Sussex BN25 4JH

Demolition of existing conservatory and replacement with single storey side extension, installation of solar panels, external wall insulation/render w...

Householder Planning Permission Lewes
14 Aug 2026 Approved 30 Sep LW/26/0384

87 Allington Road Newick East Sussex BN8 4ND

Removal of existing detached single garage and replacement with detached triple garage

Householder Planning Permission Lewes
13 Aug 2026 Awaiting decision LW/26/0434

96 Bevendean Avenue Saltdean East Sussex BN2 8PE

Erection of a single-storey wraparound rear extension with an additional 1.0m rear projection, front porch, and loft conversion with hip-to-gable exte...

Householder Planning Permission Lewes
13 Aug 2026 Approved 23 Sep LW/26/0377

Shelleys Farm Markstakes Lane Chailey East Sussex BN8 4BS

Demolition of existing conservatory and erection of side, rear and front extensions, replacement windows, rear and side dormers, and associated roof a...

Householder Planning Permission Lewes
12 Aug 2026 Approved 24 Sep LW/26/0293

26 Abbey Close Peacehaven East Sussex BN10 7SD

Extension of existing porch

Householder Planning Permission Lewes
11 Aug 2026 Awaiting decision LW/26/0427

9 Crocks Dean Peacehaven East Sussex BN10 8JD

Replacement and enlargement of existing garage to form a single-storey front extension, enlargement of existing driveway to accommodate 2no additional...

Householder Planning Permission Lewes
7 Aug 2026 Awaiting decision LW/26/0331

Lower Burrells Chiltington Lane East Chiltington East Sussex BN7 3QU

Alterations to existing plant room and modifications to the existing dwelling

Householder Planning Permission Lewes
7 Aug 2026 Awaiting decision LW/26/0332

Lower Burrells Chiltington Lane East Chiltington East Sussex BN7 3QU

Alterations to existing plant room and modifications to the existing dwelling

Listed Building Consent Application Lewes
6 Aug 2026 Approved 19 Oct LW/26/0419

Conkers South Road Wivelsfield Green East Sussex RH17 7QS

Replacement of wooden driveway gates with electrically-operated timber gates, timber pedestrian gate to the right side of the driveway entrance

Planning Application Lewes
6 Aug 2026 Approved 18 Sep LW/26/0363

92 Hawth Park Road Seaford East Sussex BN25 2RJ

Demolition of existing garage and single-storey rear side extension

Householder Planning Permission Lewes
5 Aug 2026 Approved 9 Oct LW/26/0413

11 Linnet Crescent Peacehaven East Sussex BN10 8FN

Loft conversion and addition of 5 no. roof lights

Certificate of Lawful Use/Dev (Proposed) Lewes
4 Aug 2026 Awaiting decision LW/26/0412

5 Pepper Close Ditchling Common Ditchling East Sussex RH15 0SJ

Rear dormer extension and roof lights to existing front roof slope

Householder Planning Permission Lewes
3 Aug 2026 Approved 18 Sep LW/26/0360

1 Downsview Drive Wivelsfield East Sussex RH17 7RN

Demolition of existing rear side conservatory, erection of two-storey side extension, single storey rear extension and modifications to roof at front ...

Householder Planning Permission Lewes
31 Jul 2026 Awaiting decision LW/26/0406

Chailey Heritage School Haywards Heath Road North Chailey East Sussex BN8 4EF

Removal of existing kitchen fixtures and fittings and addition of internal partition/door to form a store/office, removal of existing partitions in a ...

Listed Building Consent Application Lewes
30 Jul 2026 Approved 12 Oct LW/26/0402

51 Fairlight Avenue Telscombe Cliffs East Sussex BN10 7BS

Hip to gable roof conversion, addition of 1 no. rear dormer and extension at first floor level, addition of 4 no. roof lights at front, removal of exi...

Householder Planning Permission Lewes
30 Jul 2026 Approved 9 Sep LW/26/0405

Chideok Valebridge Road Burgess Hill West Sussex RH15 0RT

Alterations and extensions to existing bungalow comprising 4m deep single-storey rear extension, hip to gable extensions to front, sides and rear with...

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

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