House extensions in Spelthorne

Spelthorne received 371 householder applications in the last 12 months - about 7 a week. Rear extensions and garage works are the most common. Of the 253 decided so far, 220 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 137 applications
2 days ago Awaiting decision 26/00950/HOU

50 Roper Crescent Sunbury-on-Thames TW16 5BA

Erection of single storey rear extension. Following removal of existing pergola.

Householder Application Spelthorne
8 Sept 2026 Pending 26/00941/HOU

8 Meadow Road Ashford TW15 1PL

Erection of a single storey side and rear wraparound extension. Following removal of existing conservatory.

Householder Application Spelthorne
8 Sept 2026 Pending 26/00942/HOU

9 Links Road Ashford TW15 3RA

Erection of a single storey rear extension.

Householder Application Spelthorne
8 Sept 2026 Pending 26/00945/HOU

11 Cecil Road Ashford TW15 1RJ

Erection of single storey rear extension

Householder Application Spelthorne
7 Sept 2026 Awaiting decision 26/00934/CPD

139 Thames Side Staines-upon-Thames TW18 2JA

Certificate of Lawfulness development for proposed erection of a single storey detached outbuilding on the northern side of the plot (following demoli...

Cert. of Lawful Proposed Use and Dev Spelthorne
7 Sept 2026 Pending 26/00909/FUL

Various Locations In International Way And Lincoln Way Sunbury-on-Thames TW16 7HR

Erection and alteration of estate boundary fencing at four locations, two accessing Windmill Road and two accessing Lincoln Way.

Full Application Spelthorne
4 Sept 2026 Pending 26/00931/RVC

Woodland House Woodlands Drive Sunbury-on-Thames TW16 5JS

Variation to Condition 3 (Approved Plans) relating to planning permission 26/00539/HOU for the single storey rear extension with roof alterations to e...

Removal or Variation of Condition Spelthorne
31 Aug 2026 Pending 26/00916/CPD

9 Alexandra Road Ashford TW15 1TW

Certificate of Lawfulness for proposed conversion of roof space into habitable room, to include a rear dormer and conversion of roof from hip to gable...

Cert. of Lawful Proposed Use and Dev Spelthorne
31 Aug 2026 Awaiting decision 26/00914/HOU

53 Gordon Road Ashford TW15 3ES

Erection of a single storey side and rear wraparound extension, connecting to existing detached garage. Following removal of existing conservatory. Re...

Householder Application Spelthorne
28 Aug 2026 Pending 26/00913/CPD

Engenica House Wraysbury Reservoir Coppermill Road TW19 5NW

Certificate of lawfulness for proposed extension of existing car park

Cert. of Lawful Proposed Use and Dev Spelthorne
27 Aug 2026 Pending 26/00911/FUL

W R Sports Club The Centre Woodthorpe Road Ashford TW15 3JX

The proposed construction of a 6m x 3.7m, 2.5m high outbuilding at Ashford Tennis Club to replace existing 6m x 3m Portakabin which will be used as a ...

Full Application Spelthorne
27 Aug 2026 Pending 26/00910/PDH

60 Gaston Way Shepperton TW17 8EX

Prior Approval Notification for a single storey rear extension extending 4.5 metres beyond the rear wall of the original house, with a maximum height ...

PD Householder Prior Approval Spelthorne
27 Aug 2026 Pending 26/00869/HOU

Cherry Tree Cottage Halliford Road Sunbury-on-Thames TW16 6DG

Erection of single storey side extension and front extension (following demoliion of existing conservatory, side utility and front porch) New roof com...

Householder Application Spelthorne
26 Aug 2026 Awaiting decision 26/00900/HOU

36 Saddlebrook Park Sunbury-on-Thames TW16 7NG

Erection of a single storey rear extension and new side door

Householder Application Spelthorne
26 Aug 2026 Awaiting decision 26/00800/HOU

40 Fontmell Park Ashford TW15 2NW

Erection of two storey front extension,first floor rear extension and alterations to roof to provide habitable accommodation inlcuding two side facing...

Householder Application Spelthorne
25 Aug 2026 Pending 26/00893/HOU

5 Camilla Close Sunbury-on-Thames TW16 7PZ

Part retrospective single storey side extension

Householder Application Spelthorne
25 Aug 2026 Pending 26/00894/HOU

288 Feltham Hill Road Ashford TW15 1LN

Erection of a two-storey side extension and a part two-storey, part single storey rear extension. Loft conversion with 1 no. rear facing dormer and 4 ...

Householder Application Spelthorne
25 Aug 2026 Pending 26/00864/HOU

211 Feltham Road Ashford TW15 1BB

Erection of part two storey part single storey side and rear extension.

Householder Application Spelthorne
22 Aug 2026 Pending 26/00818/HOU

15 Duncroft Manor Vicarage Road Staines-upon-Thames TW18 4XX

Erection of boundary fence along left side and along the rear elevation of the site.

Householder Application Spelthorne
21 Aug 2026 Pending 26/00853/CPD

Raemel Burgoyne Road Sunbury-on-Thames TW16 7PP

Certificate of lawfulness for proposed hip to gable roof alteration and rear facing dormer and 3 no roof lights on front of roof.

Cert. of Lawful Proposed Use and Dev Spelthorne
21 Aug 2026 Pending 26/00883/HOU

72 Parkland Grove Ashford TW15 2JP

Conversion of existing integral/attached garage to habitable use (home office/study) facilitated by removal of the existing garage door and installati...

Householder Application Spelthorne
21 Aug 2026 Pending 26/00884/HOU

44 Roper Crescent Sunbury-on-Thames TW16 5BA

Proposed garage conversion and access gate within garden wall

Householder Application Spelthorne
21 Aug 2026 Pending 26/00887/CPD

44 Hawkewood Road Sunbury-on-Thames TW16 6HJ

Certificate of Lawfulness for the proposed erection of an outbuilding in rear garden for incidental use as store.

Cert. of Lawful Proposed Use and Dev Spelthorne
20 Aug 2026 Awaiting decision 26/00880/CPD

3 Elizabeth Avenue Laleham Staines-upon-Thames TW18 1JW

Certificate of lawfulness for proposed hip to gable roof alteration, rear facing dormer and 2 no. roof lights on either side of front roof section.

Cert. of Lawful Proposed Use and Dev Spelthorne
20 Aug 2026 Awaiting decision 26/00841/HOU

26 Thames Meadow Shepperton TW17 8LT

Proposed new roof with ridge height increase, conversion of integral garage to habitable accommodation, rear facing balcony, alterations to fenestrati...

Householder Application Spelthorne
20 Aug 2026 Pending 26/00783/CPD

44 Mulberry Trees Shepperton TW17 8JN

Certificate of Lawfulness for the proposed loft conversion facilitated by 2no. front facing and 2 no. rear facing rooflights. Erection of a single sto...

Cert. of Lawful Proposed Use and Dev Spelthorne
20 Aug 2026 Pending 26/00826/CPD

95 Groveley Road Sunbury-on-Thames TW16 7JZ

Certificate of Lawfulness for the proposed development of a loft conversion to include hip to gable extension, the installation of a rear facing dorme...

Cert. of Lawful Proposed Use and Dev Spelthorne
20 Aug 2026 Pending 26/00860/HOU

22 Wood Road Shepperton TW17 0DX

Erection of a single storey rear extension. Following removal of existing conservatory.

Householder Application Spelthorne
19 Aug 2026 Awaiting decision 26/00843/HOU

69 Vicarage Road Sunbury-on-Thames TW16 7QD

Single storey front porch extension

Householder Application Spelthorne
19 Aug 2026 Awaiting decision 26/00877/CPD

33 Minsterley Avenue Shepperton TW17 8QS

Certificate of Lawfulness for the proposed erection of a single storey rear extension.

Cert. of Lawful Proposed Use and Dev Spelthorne
19 Aug 2026 Pending 26/00876/CPD

1 Minerva Close Stanwell Moor Staines-upon-Thames TW19 6DA

Certificate of lawfulness for proposed outbuilding.

Cert. of Lawful Proposed Use and Dev Spelthorne
19 Aug 2026 Awaiting decision 26/00720/HOU

15 Gibson Place Stanwell Staines-upon-Thames TW19 7NW

Proposed extension to existing front dormer.

Householder Application Spelthorne
19 Aug 2026 Awaiting decision 26/00803/HOU

7 Hurstdene Avenue Staines-upon-Thames TW18 1HZ

Single storey rear extension and conversion of attached garage into habitable room

Householder Application Spelthorne
18 Aug 2026 Pending 26/00875/HOU

33 Kenyngton Drive Sunbury-on-Thames TW16 7RT

Erection of a single storey side extension to form larger porch. Following removal of existing porch.

Householder Application Spelthorne
17 Aug 2026 Awaiting decision 26/00820/FUL

Friendship House 49 - 51 Gresham Road Staines-upon-Thames

Sub-division of the existing third floor residential unit into two residential units, third floor rear extension, first floor rear terrace, alteration...

Full Application Spelthorne
17 Aug 2026 Awaiting decision 26/00867/CPD

61 Hithermoor Road Stanwell Moor Staines-upon-Thames TW19 6AR

Certificate of Lawfulness for a proposed outbuilding to be used as home office and home gym

Cert. of Lawful Proposed Use and Dev Spelthorne
17 Aug 2026 Awaiting decision 26/00871/CPD

Zingari The Creek Sunbury-on-Thames TW16 6BY

Certificate of Lawfulness for Proposed Development for a home office / garden pod

Cert. of Lawful Proposed Use and Dev Spelthorne
13 Aug 2026 Awaiting decision 26/00785/HOU

39 Avondale Avenue Staines-upon-Thames TW18 2PL

Erection of single storey side and rear extension, new roof with ridge height increase, extension of front bay and changes to fenestration

Householder Application Spelthorne
13 Aug 2026 Awaiting decision 26/00842/HOU

33 Petersfield Road Staines-upon-Thames TW18 1DF

Extension to existing garage with partial roof reconstruction, with internal alterations.

Householder Application Spelthorne
12 Aug 2026 Awaiting decision 26/00859/HOU

26 Chattern Road Ashford TW15 1AF

Retrospective permission for the erection of an outbuilding in rear garden for use as gym/home office.

Householder Application Spelthorne
11 Aug 2026 Awaiting decision 26/00856/CPD

51 Heathcroft Avenue Sunbury-on-Thames TW16 7SR

Certificate of lawfulness for proposed loft conversion with wraparound roof dormer from joint hip-end pitched dormer, and flat roof rear dormer, velux...

Cert. of Lawful Proposed Use and Dev Spelthorne
11 Aug 2026 Awaiting decision 26/00857/PDH

51 Heathcroft Avenue Sunbury-on-Thames TW16 7SR

Prior Approval Notification for a single storey rear extension extending 5.5 metres beyond the rear wall of the original house, with a maximum height ...

PD Householder Prior Approval Spelthorne
11 Aug 2026 Awaiting decision 26/00851/PDH

4 Russet Close Stanwell Moor Staines-upon-Thames TW19 6AX

Prior Approval Notification for a single storey rear extension extending 5.5 metres beyond the rear wall of the original house, with a maximum height ...

PD Householder Prior Approval Spelthorne
11 Aug 2026 Awaiting decision 26/00850/HOU

7 Guildford Street Staines-upon-Thames TW18 2EQ

Erection of a single storey rear extension, following removal of existing conservatory. Conversion of garage into habitable space (office/gym) with ex...

Householder Application Spelthorne
11 Aug 2026 Awaiting decision 26/00855/HOU

67 Laleham Road Staines-upon-Thames TW18 2EA

Single storey side/rear extension (following demolition of existing rear extension) and two rooflights on rear/side roof and replacement of existing w...

Householder Application Spelthorne
10 Aug 2026 Awaiting decision 26/00828/HOU

Parkside Green Street Sunbury-on-Thames TW16 6QQ

Proposed single storey rear extension

Householder Application Spelthorne
7 Aug 2026 Awaiting decision 26/00832/HOU

24 Celia Crescent Ashford TW15 3NW

Proposed single storey rear extension and entrance porch

Householder Application Spelthorne
7 Aug 2026 Awaiting decision 26/00833/CPD

24 Celia Crescent Ashford TW15 3NW

Certificate of lawfulness for proposed loft conversion with hip to gable roof extension, rear facing dormer and five front facing roof windows

Cert. of Lawful Proposed Use and Dev Spelthorne
7 Aug 2026 Awaiting decision 26/00838/HOU

52 Hazel Grove Staines-upon-Thames TW18 1JL

Erection of a single storey side and rear extension. Front porch extension. Following removal of existing garage.

Householder Application Spelthorne
7 Aug 2026 Awaiting decision 26/00835/HOU

80 Gaston Way Shepperton TW17 8EY

Erection of a two-storey side extension and single storey rear extension. Following removal of existing garage.

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

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