House extensions in Portsmouth

Portsmouth received 288 householder applications in the last 12 months - about 6 a week. Rear extensions and dormers are the most common. Of the 182 decided so far, 154 were approved. If you're planning your own, the applications below show what people nearby applied for and how the council decided.

82
|
18
|
9
Get alerts for Portsmouth

Filter applications

Date receivedLast 90 days
Date receivedLast 90 days
Select one year, or two for a range.
Number of homesAny
StatusAny
Application routeAny
Application type1 selected
KeywordsNone
Match

Matches words or phrases in the application address and description.

Showing 50 of 82 applications
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
4 Sept 2026 Awaiting decision 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 Awaiting decision 26/01013/HOU

28 Rectory Avenue Portsmouth PO6 1AL

Construction of single-storey ancillary outbuilding

Householder Planning Application Portsmouth
2 Sept 2026 Awaiting decision 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 Awaiting decision 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 26/00033/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
28 Aug 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
25 Aug 2026 Awaiting decision 26/00967/FUL

Kingcome House Staunton Street Portsmouth

Replacement cladding to south-west elevation and associated works to facilitate improvements to fire remediation scheme

Full Application Portsmouth
25 Aug 2026 Awaiting decision 26/00943/FUL

St Marys House St Marys Road Portsmouth

Replacement of like for like external door with fanlight.

Full Application Portsmouth
25 Aug 2026 Awaiting decision 26/00944/LBC

St Marys House St Marys Road Portsmouth

Replacement of like for like external door with fanlight.

Listed Building Consent Portsmouth
25 Aug 2026 Awaiting decision 26/00956/FUL

75 Aylen Road Portsmouth PO3 5HD

Construction of single storey rear extension

Full Application Portsmouth
25 Aug 2026 Awaiting decision 26/00960/CPL

93 Lower Drayton Lane Portsmouth PO6 2HE

Application for Certificate of Lawful Development for the proposed alterations to roof to include hip to gable buildup, construction of dormer to rear...

Certificate of Proposed Lawful Use/Dev Portsmouth
20 Aug 2026 Awaiting decision 26/00951/FUL

80 London Road Portsmouth PO2 0LN

Alterations to extend rear garden area into pub by removal of roof and external wall; installation of folding doors; alteration of rear boundary wall ...

Full Application Portsmouth
18 Aug 2026 Awaiting decision 26/00946/FUL

The John Jacques Wetherspoons 74 - 82 Fratton Road Portsmouth PO1 5BZ

Replacement boundary treatment and new gate to front pub garden, installation of window to side elevation, removal of existing canopy structure and as...

Full Application Portsmouth
17 Aug 2026 Awaiting decision 26/00937/HOU

27 Lindley Avenue Southsea PO4 9NT

Construction of dormer to rear roofslope with juliet balcony and installation of rooflights to front roofslope

Householder Planning Application Portsmouth
13 Aug 2026 Awaiting decision 26/00896/FUL

37 Albert Road Southsea PO5 2SE

Change of use of ground floor from commercial/retail (Class E) to hot food takeaway (Sui Generis), with installation of extraction system and alterati...

Full Application Portsmouth
7 Aug 2026 Awaiting decision 26/00911/HOU

9 Eldon Street Southsea PO5 4BS

Replacement of windows and door

Householder Planning Application Portsmouth
7 Aug 2026 Awaiting decision 26/00909/HOU

68 Grove Road Portsmouth PO6 1PT

Construction of annexe to rear garden

Householder Planning Application Portsmouth
6 Aug 2026 Awaiting decision 26/00899/FUL

Unit B Fitzherbert Road Portsmouth PO6 1RU

Installation of an external escape staircase, personnel door, and 3no. first-floor windows to serve the office area.

Full Application Portsmouth
6 Aug 2026 Awaiting decision 26/00908/HOU

The Ridgeway 66 London Road Portsmouth PO6 3ET

Alterations to roof to include hip to gable buildup and construction of single storey rear extension with roof lantern

Householder Planning Application Portsmouth
6 Aug 2026 Decided 26/00029/GPDC

83 Lovett Road Portsmouth PO3 5EX

Construction of single storey rear extension, extending 5.95m beyond the rear wall, with a height of 2.95m to the eaves and maximum height of 2.95m

General Permitted Development Portsmouth
3 Aug 2026 Awaiting decision 26/00866/HOU

20 Waverley Road Portsmouth PO6 1RA

Construction of part 2-storey/part first floor rear extension with roof enlargement and dormer to rear roofslope (facilitating a loft conversion), sol...

Householder Planning Application Portsmouth
31 Jul 2026 Approved 26/00882/CPL

4 Empshott Road Southsea PO4 8AU

Application for Certificate of Lawful Development for the proposed construction of dormer window to rear roofslope

Certificate of Proposed Lawful Use/Dev Portsmouth
31 Jul 2026 Awaiting decision 26/00747/HOU

200 Southampton Road Portsmouth PO6 4RZ

Construction of single storey outbuilding with mansard roof

Householder Planning Application Portsmouth
30 Jul 2026 Awaiting decision 26/00797/HOU

52 Priory Crescent Southsea PO4 8RN

Retrospective application for alterations to front elevation to facilitate conversion of attached garage to living room

Householder Planning Application Portsmouth
30 Jul 2026 Awaiting decision 26/00867/HOU

23 St Davids Road Southsea PO5 1QH

Replacement windows to front elevation

Householder Planning Application Portsmouth
24 Jul 2026 Awaiting decision 26/00809/FUL

39 Winchcombe Road Portsmouth PO6 4BA

Change of use from dwellinghouse (Class C3) to 8-bed/9-person house of multiple occupation (Sui Generis) including construction of single storey rear ...

Full Application Portsmouth
23 Jul 2026 Approved 26/00028/GPDC

35 Belgravia Road Portsmouth PO2 0DX

Construction of single storey rear extension, extending 4.5m beyond the rear wall, with a height of 3m to the eaves and maximum height of 3.3m

General Permitted Development Portsmouth
23 Jul 2026 Awaiting decision 26/00838/CPL

79 Goldsmith Avenue Southsea PO4 8DX

Application for Certificate of Lawful Development for the proposed conversion from dwellinghouse (Class C3) to sheltered accommodation (Class C3 (b));...

Certificate of Proposed Lawful Use/Dev Portsmouth
23 Jul 2026 Awaiting decision 26/00844/HOU

46 St Ronans Road Southsea PO4 0PT

Construction of a single-storey side extension and replacement of the existing boundary fence with brick wall, including brick piers and timber access...

Householder Planning Application Portsmouth
23 Jul 2026 Awaiting decision 26/00843/FUL

Unit A1 Clifton Street Portsmouth PO1 1QP

Construction of steel-framed light industrial unit and installation of new shutters and door openings alongside proposed drop kerbs facing stamford st...

Full Application Portsmouth
23 Jul 2026 Awaiting decision 26/00846/HOU

52 Mayfield Road Portsmouth PO2 0RW

Construction of single storey rear extension

Householder Planning Application Portsmouth
23 Jul 2026 Awaiting decision 26/00845/HOU

30 Penny Street Portsmouth PO1 2NH

Construction of single storey rear extension

Householder Planning Application Portsmouth
22 Jul 2026 Refused 26/00823/HOU

4 Dagmar Mews Auckland Road East Southsea PO5 2HF

Installation of garage door (following removal of existing)

Householder Planning Application Portsmouth
22 Jul 2026 Awaiting decision 26/00830/FUL

111 - 113 Clarendon Road Southsea PO4 0SA

Construction of single storey rear extensions to 2no. existing flats

Full Application Portsmouth
22 Jul 2026 Awaiting decision 26/00840/HOU

12 Mayfield Road Portsmouth PO2 0RW

Construction of single storey side extension and rear annexe (following removal of existing)

Householder Planning Application Portsmouth
22 Jul 2026 Awaiting decision 26/00836/HOU

1 Hilltop Crescent Portsmouth PO6 1BB

Remodelling of existing roof to include: raised ridge (to front) and construction of dormers to side (north) and rear (west) roof slopes; single-store...

Householder Planning Application Portsmouth
21 Jul 2026 Awaiting decision 26/00791/FUL

Emr Portsmouth Dundas Spur Portsmouth PO3 5NX

Construction of 6m high steel/concrete wall to northern boundary of the site.

Full Application Portsmouth
21 Jul 2026 Awaiting decision 26/00834/FUL

Queen Alexandra Hospital Southwick Hill Road Portsmouth PO6 3LY

Alterations to hospital facade and construction of acoustic fencing to form a services compound to create a new MRI suite for the hospital.

Full Application Portsmouth
21 Jul 2026 Awaiting decision 26/00825/HOU

97 St Andrews Road Southsea PO5 1ES

Construction of rear roof extension with juliet balcony and installation of front rooflights

Householder Planning Application Portsmouth
21 Jul 2026 Refused 26/00796/FUL

Basement Flat 79 Victoria Road North Southsea PO5 1PP

Change of use of the basement level to a self-contained residential flat (Use Class C3), including installation of new windows to the front elevation ...

Full Application Portsmouth
20 Jul 2026 Awaiting decision 26/00822/HOU

109 Ludlow Road Portsmouth PO6 4AF

Construction of single storey outbuilding with habitable roof space (following demolition of the existing)

Householder Planning Application Portsmouth
17 Jul 2026 Approved 26/00818/HOU

11 York Terrace Portsmouth PO2 9SG

Construction of two storey rear/side extension

Householder Planning Application Portsmouth
16 Jul 2026 Awaiting decision 26/00784/FUL

104 Stubbington Avenue Portsmouth PO2 0JG

Change of use from dwellinghouse (Class C3) to 8 person/8 bedroom house in multiple occupation (Sui Generis), including construction of single storey ...

Full Application Portsmouth
15 Jul 2026 Decided 26/00027/GPDC

24 Lindley Avenue Southsea PO4 9NU

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

General Permitted Development Portsmouth
15 Jul 2026 Approved 26/00425/FUL

44B Queens Road Portsmouth PO2 7NA

Retrospective application for the installation of a window to the rear elevation of flat

Full Application Portsmouth
15 Jul 2026 Awaiting decision 26/00806/FUL

358 Copnor Road Portsmouth PO3 5EL

Construction of single storey rear extension to create additional consultation rooms for doctor surgery and relocation of refuse storage to front fore...

Full Application Portsmouth
14 Jul 2026 Awaiting decision 26/00359/FUL

Portland Arms 136 - 138 Stamshaw Road Portsmouth PO2 8LX

Part retrospective application for change of use from Public House with associated first floor accommodation (Sui Generis) to convenience store (Class...

Full Application Portsmouth
Recency
Last 2 weeks
2-4 weeks
1-2 months
Older

Get free email alerts for new extensions applications in Portsmouth

Set up alerts

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.