House extensions in St Helens

St Helens received 336 householder applications in the last 12 months - about 6 a week. Rear extensions and side extensions are the most common. Of the 264 decided so far, 252 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 95 applications
22 Oct 2026 Awaiting decision P/2026/0556/HHFP

24 Helmsley Close Newton Le Willows St Helens WA12 9GW

Single storey rear extension.

Householder Planning Application St Helens
22 Oct 2026 Awaiting decision P/2026/0555/HHFP

4 St Aidans Close Billinge St Helens WN5 7HU

Two storey side and single storey rear extension.

Householder Planning Application St Helens
22 Oct 2026 Awaiting decision P/2026/0554/HHFP

51 Avondale Road Haydock St Helens WA11 0HJ

Single storey side extension.

Householder Planning Application St Helens
22 Oct 2026 Awaiting decision P/2026/0553/HHFP

14 Mossborough Road Rainford St Helens WA11 8QN

Proposed alterations and extensions to existing dwelling, including demoltion of side conservatory and rear extension, erection of part two storey par...

Householder Planning Application St Helens
21 Oct 2026 Awaiting decision P/2026/0552/HHFP

111 Carr Mill Road Billinge St Helens WN5 7TY

Two storey side and single storey rear extension.

Householder Planning Application St Helens
20 Oct 2026 Awaiting decision P/2026/0551/HHFP

157 Stoney Lane Rainhill St Helens L35 9JY

Erection of a single storey side and rear extension; erection of a detached garage following the demolition of the existing garage; extension to the e...

Householder Planning Application St Helens
19 Oct 2026 Awaiting decision P/2026/0547/FUL

Former Pilkington Canteen Alexandra Park Alexandra Drive St Helens

Full Planning permission for the conversion of existing Grade II Listed Building to 45 Apartments (31 one bedroom, 14 two bedroom) with internal alter...

Full Planning Application St Helens
16 Oct 2026 Awaiting decision P/2026/0540/HHFP

Fairchild Farm Bungalow Fairchild Farm Foxs Bank Lane Whiston L35 3SS

Rear dormer extension on existing bungalow.

Householder Planning Application St Helens
16 Oct 2026 Awaiting decision P/2026/0539/HHFP

25 Parkside Avenue Clock Face St Helens WA9 4DT

Single storey side extension.

Householder Planning Application St Helens
15 Oct 2026 Awaiting decision P/2026/0541/HHFP

3 Thornton Drive Newton Le Willows St Helens WA12 9AP

Part retrospective application for erection of a outbuilding

Householder Planning Application St Helens
14 Oct 2026 Awaiting decision P/2026/0550/CLP

8 Valencia Grove Eccleston Park St Helens L34 2TS

Proposed single storey flat roof rear extension.

Certificate of Lawfulness St Helens
14 Oct 2026 Awaiting decision P/2026/0535/HHFP

8 Hawarde Close Newton Le Willows St Helens WA12 9WJ

Erection of two storey side extension

Householder Planning Application St Helens
14 Oct 2026 Awaiting decision P/2026/0534/CLP

31 Beacon Road Billinge St Helens WN5 7HF

Certificate of lawfulness for proposed rear dormer.

Certificate of Lawfulness St Helens
13 Oct 2026 Awaiting decision P/2026/0545/HHFP

19 Melbourne Street Thatto Heath St Helens WA9 5QY

Erection of a two-storey side extension, alterations to the front boundary wall to provide a new vehicular access, including a sliding gate, dropped k...

Householder Planning Application St Helens
13 Oct 2026 Awaiting decision P/2026/0533/HHFP

24 Rookery Drive Rainford St Helens WA11 8BA

Single storey rear extension.

Householder Planning Application St Helens
13 Oct 2026 Awaiting decision P/2026/0530/HHFP

Bridge House South Lane Widnes WA8 3TY

Demolition of existing conservatory, erection of single-storey side and rear extensions, alterations to the existing roof including an increase in rid...

Householder Planning Application St Helens
12 Oct 2026 Awaiting decision P/2026/0537/CLP

1 Firefly Close Newton Le Willows St Helens WA12 8TF

Certificate of lawfulness for proposed single storey rear extension.

Certificate of Lawfulness St Helens
7 Oct 2026 Awaiting decision P/2026/0529/FUL

Land Off Bromilow Road And To The Rear Of Meadow Lane St Helens WA9 3AE

Proposed replacement of existing boundary treatments with secure wire mesh fencing.

Full Planning Application St Helens
5 Oct 2026 Awaiting decision P/2026/0514/HHFP

57 Belvedere Road Newton Le Willows St Helens WA12 0JS

Single storey wraparound extension, following demolition of existing single storey outbuilding.

Householder Planning Application St Helens
5 Oct 2026 Awaiting decision P/2026/0513/CLP

46 Smock Lane Ashton In Makerfield St Helens WN4 0SN

Certificate of Lawfulness for a single storey rear extension.

Certificate of Lawfulness St Helens
2 Oct 2026 Awaiting decision P/2026/0511/HHFP

46 Mottram Rise Eccleston St Helens WA10 5QZ

Single storey rear extension.

Householder Planning Application St Helens
1 Oct 2026 Awaiting decision P/2026/0510/HHFP

6 Ansdale Wood Drive St Helens WA9 5XN

Single storey rear extension.

Householder Planning Application St Helens
1 Oct 2026 Awaiting decision P/2026/0509/HHPA

36 Brook End St Helens WA9 3RS

Prior approval for a single storey rear extension projecting 4.00m from the rear, 3.40m overall height and 2.30m at the eaves.

Householder Prior Approval St Helens
1 Oct 2026 Awaiting decision P/2026/0505/HHFP

40 Rutherford Road Windle St Helens WA10 6HJ

Part single and part two storey side and rear extensions.

Householder Planning Application St Helens
30 Sept 2026 Awaiting decision P/2026/0506/HHFP

205 Hardshaw Street St Helens Merseyside WA10 1JU

Single storey rear extension.

Householder Planning Application St Helens
29 Sept 2026 Awaiting decision P/2026/0508/CLP

21 Patterson Street Newton Le Willows St Helens WA12 9PZ

Conversion of C3 dwelling to 5 bed, 6 person HMO, with all bedrooms having ensuites, and rear dormer loft conversion

Certificate of Lawfulness St Helens
29 Sept 2026 Awaiting decision P/2026/0504/HHFP

10 Park Road North Newton Le Willows St Helens WA12 9TG

Re-covering of existing roof, replacement of existing front door and side screen, and replacement of existing driveway.

Householder Planning Application St Helens
29 Sept 2026 Approved 23 Oct P/2026/0503/CLP

255 Marshalls Cross Road St Helens WA9 3DE

Certificate of lawfulness for proposed change of use from dwellinghouse (Use Class C3) to a 6-person HMO (Use Class C4), including rear dormer, front ...

Certificate of Lawfulness St Helens
29 Sept 2026 Awaiting decision P/2026/0502/FUL

17 Church Road Rainford St Helens WA11 8HE

Retrospective application for demolition of existing detached garage and erection of replacement single storey detached outbuilding, to provide 2no ha...

Full Planning Application St Helens
29 Sept 2026 Awaiting decision P/2026/0501/HHFP

6 Meadowcroft St Helens WA9 3XQ

Erection of a two storey side extension and single storey rear extension following the demolition of the existing rear conservatory and detached garag...

Householder Planning Application St Helens
29 Sept 2026 Awaiting decision P/2026/0500/HHFP

29 Gormley Drive St Helens Merseyside WA10 2UL

Erection of a detached garage.

Householder Planning Application St Helens
25 Sept 2026 Awaiting decision P/2026/0498/HHPA

60 Grange Park Road Thatto Heath St Helens WA10 3EJ

Prior approval for a single storey rear extension projecting 3.38m from the rear, 3.54m overall height and 2.29m at the eaves.

Householder Prior Approval St Helens
25 Sept 2026 Awaiting decision P/2026/0497/HHFP

3 Langholm Road Ashton In Makerfield St Helens WN4 0SE

Single storey side extension.

Householder Planning Application St Helens
24 Sept 2026 Approved 23 Oct P/2026/0496/CLP

79 Harris Street Dentons Green St Helens WA10 2NR

Certificate of lawfulness for proposed change of use from dwellinghouse (C3) to 6-person HMO (C4), including rear dormer and front rooflight.

Certificate of Lawfulness St Helens
22 Sept 2026 Awaiting decision P/2026/0489/HHFP

45 Coronation Road Windle St Helens WA10 6BE

Erection of detached garden store, following demolition of existing garage.

Householder Planning Application St Helens
18 Sept 2026 Awaiting decision P/2026/0487/HHFP

171 Shakespeare Road Sutton Manor St Helens WA9 4AL

Single storey rear extension.

Householder Planning Application St Helens
17 Sept 2026 Awaiting decision P/2026/0482/FUL

Treetops The Spinney Rainford St Helens WA11 8AS

Proposed new 3.5m high boundary fence between Treetops and adjacent car park and access road.

Full Planning Application St Helens
15 Sept 2026 Awaiting decision P/2026/0478/HHFP

4 Scarborough Drive Newton Le Willows St Helens WA12 9GY

Single storey rear extension, garage conversion and associated landscaping.

Householder Planning Application St Helens
14 Sept 2026 Awaiting decision P/2026/0476/FUL

St Peter And St Paul Catholic Primary School Derwent Road St Helens WA11 9AT

Installation of 2.4m high v-mesh security fencing to replace existing to front of school, replacement of existing gates and replacement of a side door...

Full Planning Application St Helens
11 Sept 2026 Approved 19 Oct P/2026/0473/HHPA

10 Philip Grove St Helens WA9 3TD

Prior approval for single storey rear extension, projecting 4m from the rear, 3.8m max height and 2.85m at the eaves.

Householder Prior Approval St Helens
11 Sept 2026 Awaiting decision P/2026/0472/HHFP

26 Pentland Avenue St Helens Merseyside WA9 2BG

Retrospective erection of a detached garage

Householder Planning Application St Helens
9 Sept 2026 Awaiting decision P/2026/0470/FUL

Tesco Stores James Roby Way St Helens WA9 5DT

Installation of new front entrance doors to replace existing and the installation of a plant area and a fire exit door to the side.

Full Planning Application St Helens
9 Sept 2026 Awaiting decision P/2026/0467/HHFP

Mere View Barn 1 Mere View Court Burrows Lane Eccleston St Helens L34 6JW

Single storey rear extension to main dwelling, front and side extension to existing outbuilding along with new boundary wall and planting bed.

Householder Planning Application St Helens
8 Sept 2026 Awaiting decision P/2026/0471/HHFP

2 Wells Avenue Billinge St Helens WN5 7NN

Retention of a single storey rear extension along with render to the main bungalow.

Householder Planning Application St Helens
7 Sept 2026 Awaiting decision P/2026/0460/HHFP

4 Drake Gardens St Helens Merseyside WA9 5BJ

Erection of a rear dormer.

Householder Planning Application St Helens
7 Sept 2026 Awaiting decision P/2026/0456/FUL

33 Ormskirk Street St Helens Merseyside WA10 2SZ

Retrospective application to replace stone/ceramic wall tiles with render.

Full Planning Application St Helens
4 Sept 2026 Awaiting decision P/2026/0457/HHFP

19 Windle Grove Windle St Helens WA10 6HN

Single storey side and rear extension following demolition of the existing garage.

Householder Planning Application St Helens
4 Sept 2026 Approved 26 Oct P/2026/0458/HHFP

17A Brooklands Road Eccleston St Helens WA10 5HE

Garage conversion with new windows in front elevation.

Householder Planning Application St Helens
4 Sept 2026 Approved 22 Oct P/2026/0459/HHFP

20 Buttermere Crescent Rainford St Helens WA11 7LL

Single storey side extension

Householder Planning Application St Helens
4 Sept 2026 Withdrawn 9 Oct P/2026/0453/HHFP

53 Holly Crescent Rainford St Helens WA11 8ET

Ground floor side and first floor rear extensions.

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

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