House extensions in Southampton

Southampton received 425 householder applications in the last 12 months - about 8 a week. Rear extensions and dormers are the most common. Of the 335 decided so far, 319 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 122 applications
21 Oct 2026 Awaiting decision 26/00932/FUL

2 Denbigh Gardens Southampton SO16 7PH

Erection of a front porch and single-storey rear extension.

Full Application Southampton
21 Oct 2026 Awaiting decision 26/01170/PAH

10 Valentine Avenue Southampton SO19 0ER

Erection of a single storey rear extension (Max Depth 6m, Max Height 3.5m, Eaves Height 3.5m)

Prior Approval Large Household Extension Southampton
21 Oct 2026 Awaiting decision 26/01089/FUL

Workshop rear of 307 Bursledon Road Southampton

Erection of a single-storey front extension, excavation of hard standing to make level with existing private roadway for access. Installation of 3 x p...

Full Application Southampton
19 Oct 2026 Awaiting decision 26/01202/FUL

30 Twyford Avenue Southampton SO15 5NP

Erection of single storey rear conservatory and new front porch.

Full Application Southampton
19 Oct 2026 Awaiting decision 26/01177/FUL

Vedic Hindu Temple 79 - 195 Radcliffe Road Southampton SO14 0PS

Erection of a single-storey front extension, roof alterations including replacement roof from pitched to flat and erection of spire.

Full Application Southampton
19 Oct 2026 Awaiting decision 26/01067/FUL

65 Gainsford Road Southampton SO19 7AW

Erection of single storey side extension (retrospective).

Full Application Southampton
16 Oct 2026 Awaiting decision 26/01078/FUL

41 Hazeleigh Avenue Southampton SO19 9DG

Roof alterations including raising the roof, hip to gable, side dormer and front and rear windows to facilitate loft conversion

Full Application Southampton
15 Oct 2026 Awaiting decision 26/01186/FUL

101 Upper Shirley Avenue Southampton SO15 5NL

Erection of a single-storey side extension.

Full Application Southampton
14 Oct 2026 Awaiting decision 26/01185/FUL

28 Alma Road Southampton SO14 6UP

Erection of a detached garage.

Full Application Southampton
14 Oct 2026 Awaiting decision 26/01184/FUL

27 Blenheim Avenue Southampton SO17 1DW

Erection of a single storey rear extension, new french doors and side window.

Full Application Southampton
13 Oct 2026 Awaiting decision 26/01179/PLDC

9 Wilroy Gardens Southampton SO16 9WF

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

Lawful Devt Certificate Proposed Use Southampton
13 Oct 2026 Awaiting decision 26/01123/FUL

82 Newcombe Road Southampton SO15 2FS

Erection of a single storey rear extension and roof extension to facilitate change of use from House in Multiple Occupation (Class C4) to large HMO fo...

Full Application Southampton
12 Oct 2026 Awaiting decision 26/01173/FUL

1 Aspen Holt Southampton SO16 3QE

Erection of a detached garage and works to change ground levels with retaining wall (description updated after validation of application)

Full Application Southampton
12 Oct 2026 Awaiting decision 26/01169/FUL

1 Commercial Road Southampton SO15 1GF

Installation of an enclosed external seating area to rear of building (Part Retrospective).

Full Application Southampton
9 Oct 2026 Awaiting decision 26/01167/FUL

21 - 35 St Denys Road Southampton SO17 1GJ

Installation of security boundary fencing and electric sliding gates.

Full Application Southampton
9 Oct 2026 Awaiting decision 26/00288/FUL

52 Firgrove Road Southampton SO15 3EN

Erection of a front porch.

Full Application Southampton
8 Oct 2026 Awaiting decision 26/01144/PAH

15 Roselands Gardens Southampton SO17 1QJ

Erection of a replacement single storey rear extension (Max Depth 3.34 m, Max Height 3.78 m, Eaves Height 3 m)

Prior Approval Large Household Extension Southampton
6 Oct 2026 Awaiting decision 26/01150/PLDC

71 Bryanston Road Southampton SO19 7AN

Application for a lawful development certificate for proposed roof extension works.

Lawful Devt Certificate Proposed Use Southampton
6 Oct 2026 Awaiting decision 26/01151/PAH

36 Milton Road Southampton SO15 2HR

Erection of a single storey rear extension (Max Depth 6 m, Max Height 3 m, Eaves Height 3 m)

Prior Approval Large Household Extension Southampton
2 Oct 2026 Awaiting decision 26/01143/FUL

210 Manor Road North Southampton SO19 2EB

Erection of single storey rear extension.

Full Application Southampton
2 Oct 2026 Awaiting decision 26/00969/FUL

69 Morris Road Southampton SO15 2BQ

Erection of single storey rear extension to provide an additional bedroom.

Full Application Southampton
30 Sept 2026 Awaiting decision 26/01126/FUL

39 Moorhead Court Channel Way Southampton SO14 3GQ

Installation of bi-fold doors

Full Application Southampton
30 Sept 2026 Awaiting decision 26/01086/FUL

308 Spring Road Southampton SO19 2NX

Erection of a front porch

Full Application Southampton
29 Sept 2026 Awaiting decision 26/01125/FUL

61 Newcombe Road Southampton SO15 2FT

Erection of a single-storey rear extension and roof extension to facilitate the change of use from House in Multiple Occupation (Class C4) to a large ...

Full Application Southampton
28 Sept 2026 Awaiting decision 26/01121/FUL

46 Manor Farm Road Southampton SO18 1NQ

Erection of a single-storey side extension with roof extension to facilitate loft conversion

Full Application Southampton
28 Sept 2026 Awaiting decision 26/01119/PLDC

115 Burgess Road Southampton SO16 7AF

Application for a lawful development certificate for proposed roof extension and alterations to facilitate loft conversion

Lawful Devt Certificate Proposed Use Southampton
28 Sept 2026 Awaiting decision 26/01120/FUL

296 Honeysuckle Road Southampton SO16 3BP

Erection of a single storey rear extension and roof extension and rooflights to facilitate loft conversion

Full Application Southampton
25 Sept 2026 Awaiting decision 26/01111/FUL

31 Honeysuckle Road Southampton SO16 3HR

Implementation of planning permission 24/01569/FUL for an extension and dormer windows not in accordance with condition 2(Approved Plans) and 3(Materi...

Full Application Southampton
25 Sept 2026 Awaiting decision 26/01109/FUL

19 Arnold Road Southampton SO17 1TF

Erection of a part two storey part single storey side and rear extension

Full Application Southampton
24 Sept 2026 Awaiting decision 26/01105/FUL

27 Highfield Crescent Southampton SO17 1SG

Erection of single storey extensions with roof alterations including raising the roof and front and rear dormers to create additional accommodation an...

Full Application Southampton
24 Sept 2026 Awaiting decision 26/01104/FUL

62 Dale Road Southampton SO16 6QL

Erection of a two-storey side extension, rear dormer to facilitate accommodation in roof and associated fenestration changes following demolition of e...

Full Application Southampton
24 Sept 2026 Awaiting decision 26/01073/FUL

27 Mill Road Southampton SO15 4JB

Erection of a part 2-storey, part single storey, side/rear and front extension with roof changes including hip to gable and rear dormer to facilitate ...

Full Application Southampton
23 Sept 2026 Awaiting decision 26/01102/FUL

26 Monks Wood Close Southampton SO16 3TT

Erection of a single-storey front extension

Full Application Southampton
22 Sept 2026 Awaiting decision 26/01096/FUL

12 Archery Grove Southampton SO19 9EY

Installation of a bespoke single-storey container unit within the private rear garden for use as a home hairdressing salon (Use Class E)

Full Application Southampton
22 Sept 2026 Awaiting decision 26/01097/PAH

97 Vanguard Road Southampton SO18 2EH

Erection of a single storey rear extension (Max Depth 6 m, Max Height 3 m, Eaves Height 3 m)

Prior Approval Large Household Extension Southampton
22 Sept 2026 Awaiting decision 26/01061/FUL

5B Alexandra Road Southampton SO15 5DH

Erection of single storey side and rear extension to incorporate converted existing garage.

Full Application Southampton
22 Sept 2026 Awaiting decision 26/01062/FUL

102 Oaktree Road Southampton SO18 1PH

Erection of two storey rear extension.

Full Application Southampton
21 Sept 2026 Awaiting decision 26/01094/FUL

4 Saxholm Dale Southampton SO16 7HA

Replacement roof from flat to pitched.

Full Application Southampton
21 Sept 2026 Awaiting decision 26/01092/FUL

Electricity Substation Meggeson Avenue Southampton

Erection of a single-storey side extension.

Full Application Southampton
21 Sept 2026 Awaiting decision 26/01090/FUL

49 Norham Avenue Southampton SO16 6PS

Erection of a single-storey rear extension.

Full Application Southampton
17 Sept 2026 Awaiting decision 26/01084/FUL

63 Maldon Road Southampton SO19 7AF

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

Full Application Southampton
17 Sept 2026 Awaiting decision 26/01053/FUL

Southampton General Hospital Tremona Road Southampton SO16 6YD

Part-retrospective application for replacement external glazing to the Laboratory and Pathology Building (Levels C to F) and proposed replacement exte...

Full Application Southampton
17 Sept 2026 Awaiting decision 26/01083/PLDC

116 Wilton Road Southampton SO15 5JR

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

Lawful Devt Certificate Proposed Use Southampton
16 Sept 2026 Awaiting decision 26/01079/FUL

42 Hill Farm Road Southampton SO15 5SR

Erection of a single-storey rear extension to existing garage to create an annexe.

Full Application Southampton
16 Sept 2026 Awaiting decision 26/00950/FUL

32 Burnham Chase Southampton SO18 5DF

Installation of accessible ramp and steps

Full Application Southampton
15 Sept 2026 Awaiting decision 26/01085/FUL

23 Blendworth Lane Southampton SO18 5GY

Replacement windows and doors

Full Application Southampton
15 Sept 2026 Awaiting decision 26/00918/FUL

6 Harefield Road Southampton SO17 3TH

Erection of a single storey rear extension.

Full Application Southampton
15 Sept 2026 Awaiting decision 26/00872/FUL

Builders Yard Travis Perkins Albert Road North Southampton

Installation of racking for external storage up to 5.5m high

Full Application Southampton
11 Sept 2026 Awaiting decision 26/01041/FUL

31A Victoria Road Southampton SO19 9DY

External alterations and installation of rear external staircase to convert ground floor to 2 x studio flats with reduction in existing commercial flo...

Full Application Southampton
10 Sept 2026 Awaiting decision 25/01345/FUL

49 Avenue Road Southampton SO14 6TW

Erection of a part single-storey, part two-storey side and rear extension

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.