House extensions in St Helens

St Helens received 152 householder applications in the last 12 months - about 3 a week. Rear extensions and side extensions are the most common. Of the 98 decided so far, 95 were approved. If you're planning your own, the applications below show what people nearby applied for and how the council decided.

61 last 90 days
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19 last 30 days
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8 last 14 days

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Showing 50 of 61 applications
P/2026/0355/HHPA 7 Jul 2026 Awaiting decision

18 Woodstock Avenue Newton Le Willows St Helens WA12 8PR

Prior approval for single storey flat roof rear extension, projecting 4m from the rear and 3m max height.

St Helens 7 Jul 2026
P/2026/0348/HHFP 6 Jul 2026 Awaiting decision

2 Windle Grove Windle St Helens WA10 6HL

Single storey infill rear extension.

St Helens 6 Jul 2026
P/2026/0349/HHFP 6 Jul 2026 Awaiting decision

7 Cecil Drive Eccleston St Helens WA10 5DF

Single storey front, side and rear wraparound extension, following removal of sun room.

St Helens 6 Jul 2026
P/2026/0351/HHFP 3 Jul 2026 Awaiting decision

19 Crawford Street Clock Face St Helens WA9 4XQ

Single storey rear extension.

St Helens 3 Jul 2026
P/2026/0350/HHFP 3 Jul 2026 Awaiting decision

5 Birchley View St Helens WA11 7NT

Erection of garden annexe, covered outdoor kitchen, raised patio & canopy to the rear.

St Helens 3 Jul 2026
P/2026/0347/HHPA 2 Jul 2026 Awaiting decision

24 Woolston Road Haydock St Helens WA11 0FQ

Prior approval for single storey rear extension, projecting 4.05m from the rear, 3.6m max height, and 2.32m at the eaves.

Householder Prior Approval St Helens 2 Jul 2026
P/2026/0342/HHFP 1 Jul 2026 Awaiting decision

2 Plane Tree Grove Haydock St Helens WA11 0QY

Single storey rear extension.

Householder Planning Application St Helens 1 Jul 2026
P/2026/0340/HHFP 26 Jun 2026 Awaiting decision

47 Rainford Road Windle St Helens WA10 6BZ

Single storey rear extension and pergola, detached annex to rear, and carport to front.

Householder Planning Application St Helens 26 Jun 2026
P/2026/0326/HHFP 22 Jun 2026 Awaiting decision

12 St James Road Rainhill St Helens L35 0PF

First floor front extension, with change of existing roof from flat to pitched, and new external opening to rear. New front boundary wall and gates wi...

Householder Planning Application St Helens 22 Jun 2026
P/2026/0330/FUL 22 Jun 2026 Awaiting decision

34 Douglas Avenue Billinge St Helens WN5 7QY

Retrospective change of use of open space to residential garden with the erection of boundary fencing. Proposed erection of a detached garden studio f...

Full Planning Application St Helens 22 Jun 2026
P/2026/0323/HHFP 22 Jun 2026 Awaiting decision

49 Daresbury Road Eccleston St Helens WA10 5DR

Part garage conversion along with alterations to the existing front porch.

Householder Planning Application St Helens 22 Jun 2026
P/2026/0329/HHFP 19 Jun 2026 Awaiting decision

18 Balmoral Avenue St Helens WA9 3TU

Single storey rear and side extension.

Householder Planning Application St Helens 19 Jun 2026
P/2026/0322/FUL 19 Jun 2026 Awaiting decision

6 George Street St Helens WA10 1BU

Change of use at first floor level from commercial (E) to 1no flat (C3). New ground floor shop front door, and first floor window frame to match exist...

Full Planning Application St Helens 19 Jun 2026
P/2026/0314/HHFP 17 Jun 2026 Awaiting decision

6 Pintail Close St Helens Merseyside WA11 9YN

Fisrt floor side extension, and new bifold doors at ground floor rear.

Householder Planning Application St Helens 17 Jun 2026
P/2026/0320/HHFP 17 Jun 2026 Awaiting decision

143 Portico Lane Eccleston Park St Helens L34 2QS

Single storey side and rear wraparound extension.

Householder Planning Application St Helens 17 Jun 2026
P/2026/0321/HHFP 17 Jun 2026 Awaiting decision

Gorse Lodge Gorsey Lane Bold St Helens WA9 4SQ

Proposed 1.5 storey front extension and loft conversion with front and rear dormers. Single storey side infill extension, fenestration amendments, ext...

Householder Planning Application St Helens 17 Jun 2026
P/2026/0319/FUL 17 Jun 2026 Awaiting decision

Windle House Dental Surgery 1 Spray Street St Helens WA10 2NN

Two storey side and rear extension, along with external alterations.

Full Planning Application St Helens 17 Jun 2026
P/2026/0315/FUL 16 Jun 2026 Awaiting decision

Rowlands Pharmacy Four Acre Health Centre Burnage Avenue Clock Face St Helens WA9 4QB

Proposed front extension along with associated external works.

Full Planning Application St Helens 16 Jun 2026
P/2026/0308/HHFP 11 Jun 2026 Awaiting decision

Stanley Bank Barn Stanley Bank Road Haydock St Helens WA11 0UP

Proposed detached garage

Householder Planning Application St Helens 11 Jun 2026
P/2026/0306/CLP 9 Jun 2026 Awaiting decision

Highfield Crank Road Crank St Helens WA11 7RZ

Erection of a conservatory to the side.

Certificate of Lawfulness St Helens 9 Jun 2026
P/2026/0300/HHPA 8 Jun 2026 Awaiting decision

6 Syston Avenue St Helens WA11 9JJ

Prior approval for proposed apex single storey rear extension, projecting 3.26m from the rear, 3.74m max height, and 2.27m at the eaves.

Householder Prior Approval St Helens 8 Jun 2026
P/2026/0301/HHFP 4 Jun 2026 Awaiting decision

2 Wells Avenue Billinge St Helens WN5 7NN

Retrospective application for the retention of a 1.8m boundary fence, removal of the hedgerow, and other landscaping works.

Householder Planning Application St Helens 4 Jun 2026
P/2026/0298/HHFP 4 Jun 2026 Awaiting decision

58 Hinckley Road St Helens Merseyside WA11 9JZ

First floor front extension along with a pitched roof to the existing front dormer, and alterations to external openings.

Householder Planning Application St Helens 4 Jun 2026
P/2026/0297/HHFP 4 Jun 2026 Awaiting decision

Wheatacre House Gorsey Lane Bold St Helens WA9 4ST

Single storey side extension.

Householder Planning Application St Helens 4 Jun 2026
P/2026/0296/HHFP 3 Jun 2026 Awaiting decision

2 Yew Tree Avenue St Helens WA9 3XA

Retention of a boundary fence and gates.

Householder Planning Application St Helens 3 Jun 2026
P/2026/0305/CLP 3 Jun 2026 Awaiting decision

20 Woburn Avenue Newton Le Willows St Helens WA12 8PP

Rear dormer extension.

Certificate of Lawfulness St Helens 3 Jun 2026
P/2026/0293/FUL 2 Jun 2026 Awaiting decision

Lea Green Business Park Eurolink Sutton Manor St Helens

Extension of hardstanding.

Full Planning Application St Helens 2 Jun 2026
P/2026/0302/CLP 2 Jun 2026 Awaiting decision

Rainford Brook Lodge Community Primary School Rufford Road Rainford St Helens WA11 8JX

Single storey front infill extension to form a new entrance lobby.

Certificate of Lawfulness St Helens 2 Jun 2026
P/2026/0288/CLP 1 Jun 2026 Decided

4 Heyes Grove Rainford St Helens WA11 8BW

Single storey side extension.

Certificate of Lawfulness St Helens 1 Jun 2026
P/2026/0286/HHPA 29 May 2026 Decided

3 Fell Grove St Helens Merseyside WA11 7DS

Prior approval for proposed single storey rear extension, projecting 4m from the rear, 3.9m max height, and 2.48m at the eaves.

Householder Prior Approval St Helens 29 May 2026
P/2026/0295/HHFP 28 May 2026 Awaiting decision

35 Womack Gardens St Helens WA9 5UY

First floor rear extension.

Householder Planning Application St Helens 28 May 2026
P/2026/0287/HHFP 27 May 2026 Awaiting decision

8 Laurel Drive Eccleston St Helens WA10 5JD

Demolition of existing conservatory and erection of a single storey rear extension along with partial conversion of existing garage and alterations fr...

Householder Planning Application St Helens 27 May 2026
P/2026/0283/HHFP 27 May 2026 Awaiting decision

Rowan Croft Gores Lane Crank St Helens WA11 8QX

Demolition of existing garage and erection of front porch and single storey side extension

Householder Planning Application St Helens 27 May 2026
P/2026/0279/HHFP 26 May 2026 Awaiting decision

19 Peebles Avenue St Helens Merseyside WA11 9QS

Single storey rear infill extension.

Householder Planning Application St Helens 26 May 2026
P/2026/0274/HHFP 25 May 2026 Awaiting decision

7 Rebecca Gardens St Helens Merseyside WA9 3XW

Two storey side extension with single storey rear wraparound extension.

Householder Planning Application St Helens 25 May 2026
P/2026/0278/HHFP 21 May 2026 Awaiting decision

21 Claremont Road Billinge St Helens WN5 7LT

Single storey rear and side extension.

Householder Planning Application St Helens 21 May 2026
P/2026/0273/HHFP 21 May 2026 Awaiting decision

63 Springfield Lane Eccleston St Helens WA10 5HB

Single storey rear infill extension following demolition of existing conservatory, and a rear dormer.

Householder Planning Application St Helens 21 May 2026
P/2026/0261/FUL 18 May 2026 Awaiting decision

Blacks Garage 53 - 55 Church Road Rainford St Helens WA11 8EZ

Change of use from selling and/or displaying motor vehicles (Sui Generis) to flooring showroom (Class E(a)), and ground floor front extension to premi...

Full Planning Application St Helens 18 May 2026
P/2026/0260/CLP 18 May 2026 Decided

64 Stanley Avenue Rainford St Helens WA11 8JA

Single storey side extension

Certificate of Lawfulness St Helens 18 May 2026
P/2026/0254/HHPA 15 May 2026 Decided

18 Balmoral Avenue St Helens WA9 3TU

Prior approval for single storey rear extension, projecting 3.5m from the rear, 3.8m max height and 2.6m at the eaves.

Householder Prior Approval St Helens 15 May 2026
P/2026/0264/HHFP 15 May 2026 Awaiting decision

11 Cumberland Avenue St Helens WA10 3PR

Single storey side extension.

Householder Planning Application St Helens 15 May 2026
P/2026/0259/HHFP 14 May 2026 Decided

22 Bodmin Grove St Helens Merseyside WA11 9ET

Single storey wraparound extension to the side and rear elevations.

Householder Planning Application St Helens 14 May 2026
P/2026/0238/HHFP 13 May 2026 Awaiting decision

87 Higher Lane Rainford St Helens WA11 8BQ

Two storey side and single storey rear extension.

Householder Planning Application St Helens 13 May 2026
P/2026/0257/CLP 13 May 2026 Decided

63 Highmarsh Crescent Newton Le Willows St Helens WA12 9WE

Single storey rear extension to replace existing conservatory.

Certificate of Lawfulness St Helens 13 May 2026
P/2026/0250/FUL 13 May 2026 Awaiting decision

Office 1 Hsl Building 437 Warrington Road Rainhill St Helens L35 4LL

Single storey side extension

Full Planning Application St Helens 13 May 2026
P/2026/0249/HHPA 13 May 2026 Decided

10A Main Street Billinge St Helens WN5 7HR

Prior approval for a single storey rear extension projecting 4.02m from the rear, 3.92m overall height and 2.39m at the eaves.

Householder Prior Approval St Helens 13 May 2026
P/2026/0243/HHFP 12 May 2026 Decided

19 Matilda Close Newton Le Willows St Helens WA12 8TE

Conversion of the existing detached garage to a home office.

Householder Planning Application St Helens 12 May 2026
P/2026/0239/HHFP 8 May 2026 Decided

3 Wagon Lane Haydock St Helens WA11 0HZ

Single storey rear extension following the demolition of existing single storey rear extension and conservatory

Householder Planning Application St Helens 8 May 2026
P/2026/0242/HHFP 8 May 2026 Decided

17 Douglas Avenue Billinge St Helens WN5 7QY

Single storey rear extension following removal of existing conservatory along with part garage conversion.

Householder Planning Application St Helens 8 May 2026
P/2026/0240/CLP 8 May 2026 Decided

Wood Cottage Blundells Lane Rainhill St Helens L35 6NB

Single storey side and rear extensions

Certificate of Lawfulness St Helens 8 May 2026
Recency
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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 — taller, larger, 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 with objections) 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.