House extensions in Sefton

Sefton received 656 householder applications in the last 12 months - about 13 a week. Rear extensions and garage works are the most common. Of the 512 decided so far, 495 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 154 applications
22 Oct 2026 Registered DC/2026/01581

21 Hall Road East Crosby L23 8TT

Proposed new site boundary design

Householder application Sefton
21 Oct 2026 Registered DC/2026/01653

Cooksons Bridge Pub Gorsey Lane Bridge Gorsey Lane Litherland L21 0EJ

Change of use to the ground floor of existing public house (Sui Generis) to a children's day nursery (Use Class E(f)) with associated internal alterat...

Full Application Sefton
21 Oct 2026 Registered DC/2026/01644

Medicines Management Building 375 Park Lane Maghull Liverpool L31 1HF

Erection of single storey and two storey side extensions to medicine management building with associated landscape works located within Ashworth hospi...

Full Application Sefton
19 Oct 2026 Registered DC/2026/01771

30 Moss Lane Southport PR9 7QR

Replacement of existing flat roof with pitched roof and elevation alterations.

Householder application Sefton
19 Oct 2026 Registered DC/2026/01009

7 Hartdale Road Thornton L23 1TA

Erection of a porch to the front of the dwellinghouse.

Householder application Sefton
16 Oct 2026 Registered DC/2026/01719

Freshfield Primary School Watchyard Lane Formby L37 3JT

New 2.4m high security fencing around front perimeter with fencing parallel to 79 cable street.

Full Application Sefton
16 Oct 2026 Registered DC/2026/01714

192 Southport Road Bootle L20 9EJ

Erection of single storey extension to the side and rear and erection of dormer to the rear of the dwellinghouse.

Householder application Sefton
16 Oct 2026 Registered DC/2026/01578

37 Mill Lane Southport PR9 7PL

Erection of a single storey extension to the rear, following the demolition of existing conservatory.

Householder application Sefton
14 Oct 2026 Registered DC/2026/01741

55 Ashton Road Birkdale PR8 4QF

Ground floor rear elevation extension

Householder application Sefton
14 Oct 2026 Registered DC/2026/01712

100 Taunton Drive Aintree L10 8JP

Removal of a full-width rear conservatory and part of the existing garage, to be replaced by a single-storey rear and side extension.

Householder application Sefton
14 Oct 2026 Registered DC/2026/01594

22 Warren Road Blundellsands L23 6UB

Alterations to the boundary including the erection of a new boundary wall following the demolition of the existing wall, creation of a new front drive...

Full Application Sefton
14 Oct 2026 Registered DC/2026/01711

53 Pilkington Road Southport PR8 6PD

Proposed single storey rear extension following demolition of outbuildings including erection of 1.8m timber fence along boundary.

Householder application Sefton
13 Oct 2026 Registered DC/2026/01672

10 Ecclesall Avenue Litherland L21 5HQ

Prior approval submission for a proposed rear extension projecting 4.50 metres from the rear wall of the original dwellinghouse with a height of 2.48 ...

Prior notification - household (42 days) Sefton
12 Oct 2026 Registered DC/2026/01700

Scotch Piper Inn Southport Road Lydiate L31 4HD

Installation of a standalone 96 sqm timber framed pergola with pitched timber/shingle roof

Full Application Sefton
12 Oct 2026 Registered DC/2026/01695

17 Mere Road Formby L37 2JX

Certificate of lawfulness for the proposed erection of new dorma loft conversion at the rear of the dwellinghouse.

Certificate of Lawfulness - Proposed Use Sefton
12 Oct 2026 Registered DC/2026/01690

119 Lexton Drive Southport PR9 8QN

Single storey side extension

Certificate of Lawfulness - Proposed Use Sefton
12 Oct 2026 Registered DC/2026/01694

Public Toilets Cambridge Road Southport

Alterations to front access, minor alterations to the window and door openings to the elevations, and confirmation of use under class E as retail and ...

Full Application Sefton
12 Oct 2026 Registered DC/2026/01691

57 Buckingham Road Maghull L31 7DN

Single storey extension at the rear and side and pitched roof to replace flat roof to existing single story extension at the rear and part demoltion o...

Householder application Sefton
9 Oct 2026 Registered DC/2026/01684

110 Preston New Road Southport PR9 8PH

Certificate of lawfulness for a proposed single storey side extension

Certificate of Lawfulness - Proposed Use Sefton
9 Oct 2026 Registered DC/2026/01688

4 Grovewood Birkdale PR8 2NU

Replacement of the existing first floor window to the front elevation with a Juliet balcony

Householder application Sefton
9 Oct 2026 Registered DC/2026/01687

118 Cambridge Road Crosby L23 7UA

Erection of a two storey extension to the side and a single storey extension and conservatory to the rear of the dwellinghouse, following the demoliti...

Householder application Sefton
9 Oct 2026 Registered DC/2026/01686

33 Melling Lane Maghull L31 3DG

Proposed erection of two storey bay and extension of main roof over bay at front, outer skin of front elevation brickwork rebuilt and single story ext...

Householder application Sefton
9 Oct 2026 Registered DC/2026/01683

26 Thornbridge Avenue Litherland L21 5JX

Single storey rear and side extension with pitched roof

Householder application Sefton
8 Oct 2026 Registered DC/2026/01681

7 Thornbeck Avenue Hightown L38 0BD

Proposed ground floor rear elevation extension.

Householder application Sefton
8 Oct 2026 Registered DC/2026/01475

Southport And Birkdale Sports Club Trafalgar Road Birkdale PR8 2HF

Installation of disabled ramp to front of pavillion.

Full Application Sefton
8 Oct 2026 Registered DC/2026/01491

35 Sandhurst Drive Aintree L10 6LU

Demolition of existing garage and construction of a two-storey extension to the gable of the property and the conversion of the existing and new roof ...

Householder application Sefton
8 Oct 2026 Registered DC/2026/01551

28 Chestnut Avenue Crosby L23 2SZ

Erection of a single storey extension with two new roof lights in the roof at the rear and replacement of the external cheeks of the dormer at the fro...

Householder application Sefton
7 Oct 2026 Registered DC/2026/01670

65 Scarisbrick New Road Southport PR8 6LF

Boundary treatment of brick piers, timber infill fence and metal vehicle gates to front and side of property.

Householder application Sefton
7 Oct 2026 Registered DC/2026/01674

166 Hampton Road Southport PR8 5DL

Erection of single storey extension to the side of the dwellinghouse.

Householder application Sefton
7 Oct 2026 Registered DC/2026/01666

27 Griffiths Drive Southport PR9 7DP

Certificate of lawfulness for the proposed loft conversion with dormer to rear

Certificate of Lawfulness - Proposed Use Sefton
7 Oct 2026 Registered DC/2026/01667

22 Churchgate Southport PR9 7JJ

Demolition of conservatory, single storey extensions to the front and rear, internal alterations, including replacing and adding additional windows.

Householder application Sefton
6 Oct 2026 Registered DC/2026/01658

4 Sunningdale Drive Crosby L23 7XA

Proposed front elevation first floor dormer extension, installation of 2no. rooflights to front elevation, Zinc cladding to the existing rear elevatio...

Householder application Sefton
6 Oct 2026 Registered DC/2026/01654

127 Marshside Road Southport PR9 9TA

Restoration works and minor alterations (retrospective)

Householder application Sefton
6 Oct 2026 Registered DC/2026/01560

63-65 Merton Road Bootle L20 7AP

Conversion of building into 14 bed House in Multiple Occupation (HMO) (Sui Generis) (maximum of 16 persons) comprising of 14 Single-occupancy resident...

Full Application Sefton
5 Oct 2026 Registered DC/2026/01646

136 Watchyard Lane Formby L37 3JX

Part removal of pitched roof above the garage, and implementation of a first floor balcony and patio doors to the front elevation.

Householder application Sefton
5 Oct 2026 Registered DC/2026/01645

2 Gamekeepers Cottage Rothwells Lane Thornton L23 1TN

Erection of a timber lean-to to an existing garage.

Householder application Sefton
5 Oct 2026 Registered DC/2026/01647

65 Coney Crescent Crosby L23 9YW

Erection of a single-storey side extension with pitched roof and associated internal alterations

Householder application Sefton
5 Oct 2026 Registered DC/2026/01648

9 Dodds Lane Maghull L31 0AN

Prior approval submission for a proposed rear extension projecting 3.20 metres from the rear wall of the original dwellinghouse with a height of 2.40 ...

Prior notification - household (42 days) Sefton
5 Oct 2026 Registered DC/2026/01524

15 Mill Weir Gardens Sefton L29 7WH

Certificate of lawfulness for the proposed demolition of chimney stack and installation of solar panels to rear elevation of dwellinghouse.

Certificate of Lawfulness - Proposed Use Sefton
2 Oct 2026 Registered DC/2026/01582

14 Scarisbrick New Road Southport PR8 6PY

Certificate of lawfulness for the proposed erection of a single storey rear extension

Certificate of Lawfulness - Proposed Use Sefton
2 Oct 2026 Registered DC/2026/01211

11 Sanvino Avenue Ainsdale PR8 3NB

Proposing to demolish existing outrigger and glass lean to and extend out from the rear of the existing house by 4 metres.

Householder application Sefton
2 Oct 2026 Registered DC/2026/01603

10 Church Street Southport PR9 0QT

Conversion of existing property to 7 no. self-contained apartments (Class C3) including single storey front extension following demolition of conserva...

Full Application Sefton
1 Oct 2026 Registered DC/2026/01632

Freeland Cottages 7B Botanic Road Southport PR9 7NG

Erection of a detached single storey, 3m wide x 1.8m deep x 2.5m high outbuilding in the rear garden for use as a home office.

Householder application Sefton
30 Sept 2026 Registered DC/2026/01621

6 Sand Dune Close Blundellsands Sefton L23 6AE

Single storey rear elevation extension with balcony to first floor.

Householder application Sefton
29 Sept 2026 Registered DC/2026/01617

15 Netherton Park Road Litherland L21 5JD

Single storey rear extension with flat roof, velux windows to main roof and new angled bay windows to front elevation

Householder application Sefton
29 Sept 2026 Registered DC/2026/01614

6 Leopold Road Brighton Le Sands L22 6QZ

Proposed attic conversion with rear elevation dormer extension

Householder application Sefton
29 Sept 2026 Registered DC/2026/01541

14 Blundellsands Road West Blundellsands L23 6TF

Internal alterations and remediation work to facilitate the reinstatement of the building from 3no. flats to its original use as a single-family dwell...

Full Application Sefton
28 Sept 2026 Registered DC/2026/01535

35 Cooks Road Crosby L23 2TB

Installation of 1no. additional external pergola and TV within the external drinking area to the rear

Full Application Sefton
28 Sept 2026 Registered DC/2026/01610

159 Waterloo Road Birkdale PR8 3AU

Proposed Vehicle Access change to pavement & grass crossover

Householder application Sefton
28 Sept 2026 Registered DC/2026/01607

79 Taunton Drive Aintree L10 8JN

Construction of a single-storey rear extension to the existing dwelling, extending approximately 3.6 metres from the rear elevation, with a pitched ro...

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

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