House extensions in Southampton

Southampton received 343 householder applications in the last 12 months - about 7 a week. Rear extensions and dormers are the most common. Of the 225 decided so far, 217 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 118 applications
8 Sept 2026 Awaiting decision 26/00993/FUL

4 - 6 The Polygon Southampton SO15 2BN

Internal reconfiguration and external works including alterations to stairs, terrace improvements, replacement windows and doors, new front signage, s...

Full Application Southampton
4 Sept 2026 Awaiting decision 26/00713/FUL

Store At rear 104 Portswood Road Southampton

Alterations including new and replacement doors/windows, to facilitate change of use to a commercial kitchen.

Full Application Southampton
3 Sept 2026 Awaiting decision 26/01038/FUL

Atlantic Works Oakley Road Southampton

Application for replacement external cladding on Units B and C

Full Application Southampton
3 Sept 2026 Awaiting decision 26/01037/PAH

7 The Close Southampton SO18 5RB

Erection of a single storey rear extension (Max Depth 4m, Max Height 3.6m, Eaves Height 2.95m)

Prior Approval Large Household Extension Southampton
3 Sept 2026 Awaiting decision 26/01015/PAH

4 Weston Crescent Southampton SO18 5FQ

Erection of a single storey rear extension (Max Depth 8 m, Max Height 2.75 m, Eaves Height 2.55 m)

Prior Approval Large Household Extension Southampton
2 Sept 2026 Awaiting decision 26/00959/FUL

88 Bluebell Road Southampton SO16 3LP

Erection of two storey side extension and bin storage to the front.

Full Application Southampton
2 Sept 2026 Awaiting decision 26/01034/P63A

Turner Sims Concert Hall Building 52 Salisbury Road Southampton SO17 1BJ

Prior Approval for a single storey extension with associated reconfigurations to provide a replacement lift

PA university building Southampton
1 Sept 2026 Awaiting decision 26/01026/FUL

6 Wynter Road Southampton SO18 6NY

Erection of a two-storey side extension and a single-storey rear extension.

Full Application Southampton
1 Sept 2026 Awaiting decision 26/00873/FUL

Highcliff House Highcliff Avenue Southampton SO14 0TN

Conversion of ground floor flat to 2x1 bed flats with external alterations

Full Application Southampton
29 Aug 2026 Awaiting decision 26/01022/FUL

293 Coxford Road Southampton SO16 5LD

Change of use from dwelling house (Class C3) to house in multiple occupation (HMO Class C4) with loft conversion with roof alterations and dormer on r...

Full Application Southampton
28 Aug 2026 Awaiting decision 26/01021/FUL

10A Dean Road Southampton SO18 6AP

Erection of a single storey side extension.

Full Application Southampton
28 Aug 2026 Awaiting decision 26/01023/FUL

61 Test Lane Southampton SO16 9BH

Change of use from vacant public house (class Sui Generis) to Adult Day Care facility (class E(f)) with a side porch extension and alterations to exis...

Full Application Southampton
28 Aug 2026 Awaiting decision 26/01019/FUL

42 Pacific Close Southampton SO14 3TX

Loft conversion with roof alterations and dormer on rear elevation and single-storey rear extension.

Full Application Southampton
27 Aug 2026 Awaiting decision 26/01010/FUL

5 Grasdean Close Southampton SO18 2QR

Erection of a single-storey rear extension and associated external alterations (Retrospective Application).

Full Application Southampton
26 Aug 2026 Awaiting decision 26/01009/FUL

44 Harefield Road Southampton SO17 3TH

Erection of a front porch.

Full Application Southampton
26 Aug 2026 Awaiting decision 26/01008/FUL

46 Margam Avenue Southampton SO19 2QJ

Erection of a part 2-storey, part single storey side/rear extension.

Full Application Southampton
26 Aug 2026 Awaiting decision 26/00682/FUL

370 - 372 Shirley Road Southampton SO15 3HY

Replacement roof with associated replacement extraction, heating and air condensing units

Full Application Southampton
26 Aug 2026 Awaiting decision 26/00930/DIS

30 Victoria Road Southampton SO19 9DX

Application for approval of details reserved by condition 6 (Landscaping) and 9 (Refuse & Recycling) of permission 22/00943/FUL for flats

Discharge of Conditions Southampton
26 Aug 2026 Awaiting decision 26/00981/FUL

85 Rownhams Road Southampton SO16 5DX

Erection of 1.8m high boundary fence

Full Application Southampton
25 Aug 2026 Awaiting decision 26/00998/FUL

119 North East Road Southampton SO19 8AJ

Installation of a package locker to front of retained shop

Full Application Southampton
25 Aug 2026 Awaiting decision 26/00913/FUL

62 - 67 Bedford Place Southampton SO15 2DS

Erection of bin store enclosure.

Full Application Southampton
24 Aug 2026 Awaiting decision 26/00983/PLDC

3 Atherley Road Southampton SO15 5DR

Application for a lawful development certificate for proposed outbuilding to be used as residential annexe.

Lawful Devt Certificate Proposed Use Southampton
24 Aug 2026 Awaiting decision 26/00986/FUL

53 Norfolk Road Southampton SO15 5AT

Erection of single storey rear extension to facilitate change of use from dwelling (Class C3) to a 7 person House in Multiple Occupation (Sui generis)

Full Application Southampton
21 Aug 2026 Awaiting decision 26/00979/FUL

37 Ivy Road Southampton SO17 2JP

Erection of a single storey rear extension and new side window, following demolition of existing conservatory.

Full Application Southampton
21 Aug 2026 Awaiting decision 26/00976/FUL

97 Botany Bay Road Southampton SO19 8FE

Erection of a 2-storey side extension (Part- retrospective).

Full Application Southampton
21 Aug 2026 Awaiting decision 26/00978/FUL

6 - 7 College Place Southampton SO15 2XL

Erection of a second floor rear extension to create 1x 1-bed flat with roof terrace, associated parking and cycle/refuse storage. Addition of sedum ro...

Full Application Southampton
21 Aug 2026 Awaiting decision 26/00854/FUL

7 Highfield Close Southampton SO17 1QZ

Erection of shed

Full Application Southampton
20 Aug 2026 Awaiting decision 26/00938/FUL

160 Regents Park Road Southampton SO15 8NY

Erection of a single-storey rear extension with patio.

Full Application Southampton
19 Aug 2026 Awaiting decision 26/00968/FUL

40 Hill Lane Southampton SO15 5AY

Conversion of the existing side conservatory with new balcony above and loft conversion with roof alterations and dormer window.

Full Application Southampton
19 Aug 2026 Awaiting decision 26/00964/DIS

6 Victory Road Southampton SO15 8QZ

Application for approval of details reserved by condition 1(Brickwork) of permission 26/00022/APFUL for erection of a front porch, single-storey rear ...

Discharge of Conditions Southampton
18 Aug 2026 Awaiting decision 26/00962/FUL

173 Portsmouth Road Southampton SO19 9BG

Formation of a vehicular access with dropped kerb

Full Application Southampton
18 Aug 2026 Awaiting decision 26/00934/PLDC

22 Lower Mortimer Road Southampton SO19 2HF

Application for a lawful development certificate for a proposed loft conversion with roof alterations.

Lawful Devt Certificate Proposed Use Southampton
18 Aug 2026 Awaiting decision 26/00891/LBC

2 Rockstone Place Southampton SO15 2EP

Listed building consent sought for first and second floor rear extension to create a lift shaft, new raised decking to rear garden and internal altera...

Listed Building Consent Southampton
17 Aug 2026 Awaiting decision 26/00953/FUL

51 Shanklin Road Southampton SO15 7RG

Erection of a single-storey rear extension.

Full Application Southampton
17 Aug 2026 Awaiting decision 26/00231/FUL

27 Cobbett Road Southampton SO18 1HJ

Erection of a single storey rear extension

Full Application Southampton
14 Aug 2026 Awaiting decision 26/00904/FUL

52 Orchards Way Southampton SO17 1RE

Erection of a single-storey rear extension and garage roof alterations to partially convert to living space

Full Application Southampton
14 Aug 2026 Awaiting decision 26/00908/FUL

Fairisle Infant School Fairisle Road Southampton SO16 8BY

Installation of Air Source Heat Pumps and compound enclosures with external alterations to relocate doors

Full Application Southampton
14 Aug 2026 Awaiting decision 26/00946/FUL

120 Weston Lane Southampton SO19 9HG

Widening of vehicular access including extension of dropped kerb.

Full Application Southampton
14 Aug 2026 Awaiting decision 26/00945/FUL

156 Cheriton Avenue Southampton SO18 5JD

Erection of a part 2-storey, part single storey rear extension.

Full Application Southampton
13 Aug 2026 Awaiting decision 26/00937/PLDC

74 Warren Crescent Southampton SO16 6BX

Application for a lawful development certificate for a proposed erection of a single-storey rear extension.

Lawful Devt Certificate Proposed Use Southampton
13 Aug 2026 Awaiting decision 26/00939/PLDC

7 Glen Eyre Way Southampton SO16 3GD

Lawful development certificate for loft conversion, roof alterations and dormer windows on side and rear elevations.

Lawful Devt Certificate Proposed Use Southampton
13 Aug 2026 Awaiting decision 26/00940/FUL

198 Burgess Road Southampton SO16 3AY

Installation of front canopy (retrospective) and regularisation of the change of use from a hot food takeaway (Sui Generis) to a restaurant (Class E) ...

Full Application Southampton
13 Aug 2026 Awaiting decision 26/00884/FUL

Mosque 96 - 100 Portswood Road Southampton

Erection of 2-storey front extensions to create additional floorspace to the shop and ancillary spaces for the mosque.

Full Application Southampton
12 Aug 2026 Awaiting decision 26/00885/FUL

47 Sedbergh Road Southampton SO16 9GZ

Erection of single storey rear extension (retrospective)

Full Application Southampton
12 Aug 2026 Awaiting decision 26/00905/FUL

Holy Trinity Church Weston Lane Southampton SO19 9HG

Installation of shipping container to be used as a parish office ancillary to the existing church and Church Centre

Full Application Southampton
12 Aug 2026 Awaiting decision 26/00933/PAH

89 Kingsley Road Southampton SO15 8QL

Erection of a single storey rear extension (Max Depth 4 m, Max Height 3 m, Eaves Height 3 m)

Prior Approval Large Household Extension Southampton
11 Aug 2026 Awaiting decision 26/00929/FUL

96 Starboard Way Southampton SO16 8NT

Erection of a single-storey rear extension

Full Application Southampton
10 Aug 2026 Awaiting decision 26/00923/PLDC

28 Margam Avenue Southampton SO19 2QJ

Application for a lawful development certificate for proposed roof extension including rear hip to gable and side dormers to facilitate loft conversio...

Lawful Devt Certificate Proposed Use Southampton
10 Aug 2026 Awaiting decision 26/00924/FUL

208 Middle Road Southampton SO19 8PG

Single storey rear extension

Full Application Southampton
7 Aug 2026 Awaiting decision 26/00919/FUL

Cranbury Towers 35 Onslow Road Southampton

Installation of replacement windows and doors

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

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