House extensions in Portsmouth

Portsmouth received 362 householder applications in the last 12 months - about 7 a week. Rear extensions and dormers are the most common. Of the 269 decided so far, 229 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 76 applications
Yesterday Awaiting decision 26/01034/FUL

2 - 20 Warwick Crescent Southsea

Replacement of 10 entrance doors, PVCu panel system, 6 No. PVCu Spandrel Panels with a fire resisting blockwork cavity wall construction with external...

Full Application Portsmouth
Yesterday Awaiting decision 26/01033/FUL

22 - 40 (evens) Warwick Crescent Southsea

Installation of replacement doors and windows; alterations to include removal of uPVC cladding and replace with brick

Full Application Portsmouth
23 Oct 2026 Awaiting decision 26/01175/FUL

82 Locksway Road Southsea PO4 8JP

Alterations to roof including installation of front dormer and rear roof extension (following removal of existing chimney)

Full Application Portsmouth
21 Oct 2026 Awaiting decision 26/01235/HOU

24 Crofton Road Southsea PO4 8NX

Construction of dormer window to front roofslope

Householder Planning Application Portsmouth
21 Oct 2026 Awaiting decision 26/01185/HOU

43 White Hart Road Portsmouth PO1 2TY

Partial conversion of car port and garage to additional living space, alteration to fenestration and replacement of the existing rear garden boundary ...

Householder Planning Application Portsmouth
21 Oct 2026 Awaiting decision 26/01032/FUL

20 - 76 Waterloo Street Southsea

Replacement of 24 No. property entrance doors to FD30s, PVCu panel system which contains the property entrance door and kitchen window. To be replaced...

Full Application Portsmouth
20 Oct 2026 Awaiting decision 26/01216/FUL

45 Pitcroft Road Portsmouth PO2 8BB

Change of use from dwellinghouse (Class C3) to house in multiple occupation (Class C4) with construction of single storey rear extension

Full Application Portsmouth
20 Oct 2026 Awaiting decision 26/00989/CPL

22 Norwich Road Portsmouth PO6 3SE

Application for Certificate of Lawful Development for the proposed construction of a single-storey outbuilding with dual-pitched roof to rear garden

Certificate of Proposed Lawful Use/Dev Portsmouth
19 Oct 2026 Awaiting decision 26/01197/CPL

Aggie Weston House 22 Edinburgh Road Portsmouth

Application for Certificate of Lawful Development for the proposed alterations to elevations to improve fire safety

Certificate of Proposed Lawful Use/Dev Portsmouth
16 Oct 2026 Awaiting decision 26/01155/HOU

5 Portsdown Avenue Portsmouth PO6 1EH

Construction of a single-storey rear extension (following removal of the existing extension) and front porch; roof alterations comprising a hip-to-gab...

Householder Planning Application Portsmouth
16 Oct 2026 Awaiting decision 26/01130/FUL

145 Copnor Road Portsmouth PO3 5BS

Conversion of existing building (Class E) to form 10no. one-bedroom flats (Class C3), with associated roof and rear extensions, insertion of windows a...

Full Application Portsmouth
15 Oct 2026 Awaiting decision 26/01003/HOU

4 Tregaron Avenue Portsmouth PO6 2JX

Construction of front boundary wall (following removal of existing) with steel grill and gates

Householder Planning Application Portsmouth
14 Oct 2026 Awaiting decision 26/01188/FUL

140B Lake Road Portsmouth PO1 4HH

Change of use of upper floor flat (Class C3) to house in multiple occupation (Class C4), including hip-to-gable roof extension and construction of dor...

Full Application Portsmouth
12 Oct 2026 Awaiting decision 26/01176/CPL

8 Spencer Road Southsea PO4 9RN

Application for Certificate of Lawful Development for the proposed removal of front boundary wall, extension to dropped kerb, installation of archway ...

Certificate of Proposed Lawful Use/Dev Portsmouth
9 Oct 2026 Awaiting decision 26/01164/CPL

25 First Avenue Portsmouth PO6 3JH

Application for a Certificate of Lawful Development for the siting of a mobile home for ancillary use to the main dwellinghouse

Certificate of Proposed Lawful Use/Dev Portsmouth
7 Oct 2026 Awaiting decision 26/01158/HOU

68 Tangier Road Portsmouth PO3 6JN

Retrospective application for the conversion of an existing garden store to a garden room

Householder Planning Application Portsmouth
6 Oct 2026 Awaiting decision 26/00042/GPDC

48 Montague Road Portsmouth PO2 0NF

Construction of single storey rear extension, extending 5.2m beyond the rear wall, with a height of 3m to the eaves and maximum height of 3m

General Permitted Development Portsmouth
6 Oct 2026 Awaiting decision 26/01125/LBC

Guildhall Guildhall Square Portsmouth PO1 2AB

Installation of metal gates to portico

Listed Building Consent Portsmouth
6 Oct 2026 Awaiting decision 26/01124/FUL

Guildhall Guildhall Square Portsmouth PO1 2AB

Installation of metal gates to portico

Full Application Portsmouth
5 Oct 2026 Awaiting decision 26/01120/LBC

Barrington Cottage 51B Kent Road Southsea PO5 3EL

Internal refurbishment and external alterations including removal and replacement of rear conservatory

Listed Building Consent Portsmouth
5 Oct 2026 Awaiting decision 26/01119/HOU

Barrington Cottage 51B Kent Road Southsea PO5 3EL

Removal and replacement of rear conservatory

Householder Planning Application Portsmouth
2 Oct 2026 Awaiting decision 26/01142/HOU

74 Northern Parade Portsmouth PO2 9LN

Retrospective application for construction of garage extension (including remodelled roof of existing), and installation of sliding gate (including wi...

Householder Planning Application Portsmouth
2 Oct 2026 Awaiting decision 26/00935/LBC

The Old Beneficial School (Groundlings Theatre) 42 Kent Street Portsmouth PO1 3BT

Internal alterations including removal of 4no. modern display cabinets and 2no. non structural at ground floor level facilate reinstatement of origina...

Listed Building Consent Portsmouth
1 Oct 2026 Awaiting decision 26/01140/HOU

117 Winstanley Road Portsmouth PO2 8JS

Construction of front porch and alterations to fenestration

Householder Planning Application Portsmouth
30 Sept 2026 Awaiting decision 26/01060/HOU

96 Newbolt Road Portsmouth PO6 4JQ

Construction of a single-storey detached outbuilding

Householder Planning Application Portsmouth
29 Sept 2026 Awaiting decision 26/01024/FUL

Unit 2 Warrior Business Centre Fitzherbert Road Portsmouth PO6 1TX

Installation of small new roller shutter door and fire exit door to front elevation

Full Application Portsmouth
28 Sept 2026 Awaiting decision 26/00040/GPDC

116 Langstone Road Portsmouth PO3 6BX

Construction of single storey rear extension, extending 5.8m beyond the rear wall, with a height of 3m to the eaves and maximum height of 3.2m

General Permitted Development Portsmouth
28 Sept 2026 Awaiting decision 26/00039/GPDC

19 Green Farm Gardens Portsmouth PO3 5JD

Construction of single storey rear extension, extending 4.2m beyond the rear wall, with a height of 3m to the eaves and maximum height of 3m

General Permitted Development Portsmouth
25 Sept 2026 Awaiting decision 26/01070/HOU

14 Elmwood Road Portsmouth PO2 9QL

Construction of single storey rear extension following demolition of existing

Householder Planning Application Portsmouth
25 Sept 2026 Awaiting decision 26/01112/HOU

5 Coleridge Road Portsmouth PO6 4PB

Construction of single storey side, rear extension with roof lanterns and change to the fenestration

Householder Planning Application Portsmouth
24 Sept 2026 Awaiting decision 26/01117/HOU

21 Chilcote Road Portsmouth PO3 6HY

Construction of dormer window to front roofslope

Householder Planning Application Portsmouth
24 Sept 2026 Awaiting decision 26/01088/HOU

148 Havant Road Portsmouth PO6 2JG

Construction of single storey front extension

Householder Planning Application Portsmouth
23 Sept 2026 Awaiting decision 26/01104/FUL

Sun Huts Eastney Esplanade Southsea

Installation of replacement beach huts (following removal of existing)

Full Application Portsmouth
22 Sept 2026 Awaiting decision 26/01085/HOU

13 Waterworks Road Portsmouth PO6 1NG

Construction of a single storey flat roof side extension to existing outbuilding

Householder Planning Application Portsmouth
21 Sept 2026 Awaiting decision 26/00919/LBC

Portsmouth And Southsea Railway Station Station Street Portsmouth PO1 1EQ

Internal alterations including installation of 2no. digital advertisement displays

Listed Building Consent Portsmouth
18 Sept 2026 Awaiting decision 26/01089/FUL

64 Northern Road Portsmouth PO6 3DP

Change of use from Commercial, Business and Service (Use Class E) to an 8-bedroom, 8-person House in Multiple Occupation (Sui Generis), with the const...

Full Application Portsmouth
17 Sept 2026 Awaiting decision 26/00037/GPDC

65 South Road Portsmouth PO6 1QD

Construction of single storey rear extension, extending 8m beyond the rear wall, with a height of 2.5m to the eaves and maximum height of 3.6m (follow...

General Permitted Development Portsmouth
16 Sept 2026 Awaiting decision 26/01043/FUL

St Philips Church Hawthorn Crescent Portsmouth PO6 2TL

Construction of single-story side extension with dual pitched roof with associated alterations to form new entrance reception

Full Application Portsmouth
11 Sept 2026 Awaiting decision 26/01059/HOU

26B Malvern Road Southsea PO5 2NA

Construction of single storey extension, alterations to roof to include loft conversion with a set-back roof-level dormer, front roof terrace and firs...

Householder Planning Application Portsmouth
8 Sept 2026 Awaiting decision 26/01020/FUL

9 Exmouth Road Southsea

Conversion and extension of garage to two-storey, one-bedroom dwellinghouse (Class C3)

Full Application Portsmouth
8 Sept 2026 Awaiting decision 26/01030/HOU

35 Rochester Road Southsea PO4 9BA

Construction of single storey side and rear extension

Householder Planning Application Portsmouth
7 Sept 2026 Awaiting decision 26/00948/HOU

318 Havant Road Portsmouth PO6 1PG

Proposed alterations and additions to existing chalet bungalow, including the remodelling of the roof (incorporating an increased ridge height) and a ...

Householder Planning Application Portsmouth
4 Sept 2026 Approved 1 Oct 26/00032/GPDC

24 Glenthorne Road Portsmouth PO3 5DN

Construction of single storey rear extension, extending 4.04m beyond the rear wall, with a height of 2.85m to the eaves and maximum height of 2.85m

General Permitted Development Portsmouth
3 Sept 2026 Awaiting decision 26/00958/LBC

116 - 118 Commercial Road Portsmouth PO1 1EP

External alterations including installation of scaffolding to facilitate maintenance and refurbishment of windows; fixing holes to be made good with l...

Listed Building Consent Portsmouth
3 Sept 2026 Approved 21 Oct 26/01013/HOU

28 Rectory Avenue Portsmouth PO6 1AL

Construction of single-storey ancillary outbuilding

Householder Planning Application Portsmouth
2 Sept 2026 Approved 9 Oct 26/00859/HOU

125 Stanley Avenue Portsmouth PO3 6PW

Alterations to roof including rear gable end build up, extension of existing dormers to side roofslopes and installation of windows.

Householder Planning Application Portsmouth
2 Sept 2026 Approved 13 Oct 26/00034/GPDC

1 Francis Avenue Southsea PO4 0HL

Construction of single storey rear extension, extending 6m beyond the rear wall, with a height of 3m to the eaves and maximum height of 3.3m

General Permitted Development Portsmouth
2 Sept 2026 Approved 1 Oct 26/00031/GPDC

2 Spur Road Portsmouth PO6 3EB

Construction of single storey rear extension, extending 6m beyond the rear wall, with a height of 2.8m to the eaves and maximum height of 3m

General Permitted Development Portsmouth
1 Sept 2026 Awaiting decision 26/01019/VOC

7 Stubbington Avenue Portsmouth PO2 0HP

Application to vary condition 2 (Approved drawings) of planning permission 26/00281/HOU to allow construction of dormer to front roofslope

Variation/Removal of Condition Portsmouth
1 Sept 2026 Approved 1 Oct 26/00033/GPDC

32 Wallington Road Portsmouth PO2 0HB

Construction of single storey rear extension, extending 4m beyond the rear wall, with a height of 2.8m to the eaves and maximum height of 3m

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

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