House extensions in Slough

Slough received 319 householder applications in the last 12 months - about 6 a week. Rear extensions and dormers are the most common. Of the 145 decided so far, 107 were approved. If you're planning your own, the applications below show what people nearby applied for and how the council decided.

200 last 90 days
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56 last 30 days
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33 last 14 days

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Pick a year, or click two to span the range between them. Records before 2026 come from the archive.

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Showing 50 of 200 applications
P/20979/002 2 days ago Pending

16, Salt Hill Way, Slough, SL1 3TR

Construction of a proposed single storey rear extension, first floor side and re

Full Planning Slough
P/04882/002 2 days ago Pending

28, Petersfield Avenue, Slough, SL2 5DN

The erection of a single storey rear extension, which would extend beyond the re

Permitted Development with Consultation Slough
Y/08598/001 9 Jul 2026 Pending

203, Northern Road, Slough, SL2 1LU

The erection of a single storey rear extension, which would extend beyond the re

Permitted Development with Consultation Slough 9 Jul 2026
Y/12101/004 9 Jul 2026 Pending

201, Northern Road,,Slough, SL2 1LU

The erection of a single storey rear extension, which would extend beyond the re

Permitted Development with Consultation Slough 9 Jul 2026
P/15941/004 9 Jul 2026 Pending

1, Field Hurst, Slough, SL3 8PQ

Construction of a proposed first floor side and rear extension to existing dwell

Full Planning Slough 9 Jul 2026
P/07393/005 7 Jul 2026 Pending

156, The Normans, Slough, SL2 5TU

Retrospective application for single storey detached outbuilding

Full Planning Slough 7 Jul 2026
P/19496/001 7 Jul 2026 Pending

1 Autumn Close, Slough, SL1 5DH

Construction of a proposed conversion of existing garage to create habitable spa

Full Planning Slough 7 Jul 2026
Y/21104/000 7 Jul 2026 Pending

65, Knolton Way, Slough, SL2 5TE

The erection of a single storey rear extension, which would extend beyond the re

Permitted Development with Consultation Slough 7 Jul 2026
P/20888/000 6 Jul 2026 Pending

3, Rodney Way, Colnbrook, Slough, SL3 0PN

Construction of a single storey side extension

Full Planning Slough 6 Jul 2026
Y/21102/000 6 Jul 2026 Pending

200, Stoke Poges Lane, Slough, SL1 3LH

The erection of a single storey rear extension, which would extend beyond the re

Permitted Development with Consultation Slough 6 Jul 2026
P/21006/001 6 Jul 2026 Pending

3, Ravensfield, Slough, SL3 7BA

Construction of a proposed conversion of existing garage to create habitable acc

Full Planning Slough 6 Jul 2026
Y/15563/001 6 Jul 2026 Pending

38, Sutton Avenue, Slough, SL3 7AW

The erection of a single storey rear extension, which would extend beyond the re

Permitted Development with Consultation Slough 6 Jul 2026
Y/10304/001 6 Jul 2026 Pending

8, Romsey Close, Slough, SL3 8PE

The erection of a single storey rear extension, which would extend beyond the re

Permitted Development with Consultation Slough 6 Jul 2026
P/10304/002 6 Jul 2026 Pending

8, Romsey Close, Slough, SL3 8PE

Lawful Development Certificate for a proposed loft conversion to create habitabl

Certificate Proposed (Use/Development) Slough 6 Jul 2026
P/20760/003 6 Jul 2026 Pending

168, Cippenham Lane, Slough, SL1 5BA

Construction of a front extension with 1no window and door.

Full Planning Slough 6 Jul 2026
P/20374/003 1 Jul 2026 Pending

19 & 21 Martin Road, Slough, SL1 2NA

Construction of first floor rear extension for 19 & 21 Martin Road.

Full Planning Slough 1 Jul 2026
P/11508/019 1 Jul 2026 Pending

Land At Railway Terrace, Mill Street, Slough, Berkshire, SL2 5BY

Lawful development Certificate fo external façade fire safety remediation works

Certificate Proposed (Use/Development) Slough 1 Jul 2026
P/21003/000 30 Jun 2026 Pending

5 Lewins Farm Court, Lower Cippenham Lane, Slough, SL1 5DP

Construction of a proposed single storey rear extension to existing dwelling.

Full Planning Slough 30 Jun 2026
P/21089/000 30 Jun 2026 Pending

54, Hillside, Slough, SL1 2RW

Construction of a proposed part single storey, part two storey rear extension to

Full Planning Slough 30 Jun 2026
P/15821/001 30 Jun 2026 Pending

43, Elliman Avenue, Slough, SL2 5AZ

Construction of a single storey rear extension and a first floor rear extension

Full Planning Slough 30 Jun 2026
Y/03370/001 30 Jun 2026 Pending

38, Raymond Road, Slough, SL3 8LW

The erection of a single storey rear extension, which would extend beyond the re

Permitted Development with Consultation Slough 30 Jun 2026
P/14213/002 30 Jun 2026 Pending

84, Norfolk Avenue, Slough, SL1 3AD

Construction of a single storey detached outbuilding ancillary to the main dwell

Full Planning Slough 30 Jun 2026
Y/21099/000 30 Jun 2026 Pending

16, Wood Lane, Slough, SL1 9EA

The erection of a single storey rear extension, which would extend beyond the re

Permitted Development with Consultation Slough 30 Jun 2026
P/21099/001 30 Jun 2026 Pending

16, Wood Lane, Slough, SL1 9EA

Lawful development certificate for proposed use for single storey detached outbu

Certificate Proposed (Use/Development) Slough 30 Jun 2026
P/21051/001 30 Jun 2026 Pending

28, Wentworth Avenue, Slough, SL2 2DR

Retrospective application for single storey rear extension, front porch and Outb

Full Planning Slough 30 Jun 2026
P/05419/003 30 Jun 2026 Pending

567, London Road, Slough, SL3 8QE

Construction of a proposed single storey rear extension to existing dweling.

Full Planning Slough 30 Jun 2026
P/21074/001 29 Jun 2026 Pending

43, Crofthill Road, Slough, SL2 1HG

Construction of a proposed single storey front extension to form porch, part sin

Full Planning Slough 29 Jun 2026
P/01366/005 29 Jun 2026 Pending

7, Thames Road, Slough, SL3 8DU

Construction of a proposed single storey detached outbuilding following demoliti

Full Planning Slough 29 Jun 2026
P/21098/000 29 Jun 2026 Pending

21, Canterbury Avenue, Slough, SL2 1EF

Construction of a single storey detached outbuilding ancillary within the rear g

Full Planning Slough 29 Jun 2026
P/05996/008 29 Jun 2026 Pending

1B, Royston Way, Slough, SL1 6EP

Conversion of garage into habitable room

Full Planning Slough 29 Jun 2026
P/21100/000 29 Jun 2026 Pending

56, Haymill Road, Slough, SL1 6NF

Lawful development certificate for proposed use for hip to gable loft conversion

Certificate Proposed (Use/Development) Slough 29 Jun 2026
Y/05578/001 26 Jun 2026 Registered application

150, Shaggy Calf Lane, Slough, SL2 5HG

The erection of a single storey rear extension, which would extend beyond the rear wall of the original house by 6m, with a maximum height of 3m, and ...

Permitted Development with Consultation Slough 26 Jun 2026
P/10277/001 26 Jun 2026 Registered application

8, Courtlands Avenue, Slough, SL3 7LE

Construction of a single storey rear extension

Full Planning Slough 26 Jun 2026
P/16962/001 26 Jun 2026 Registered application

1, Odencroft Road, Slough, SL2 2BS

Construction of a part single storey, part two storey side and rear extension to existing dwelling.

Full Planning Slough 26 Jun 2026
P/21097/000 25 Jun 2026 Registered application

70, Dolphin Road, Slough, SL1 1TA

Demolition of existing single storey rear projection & detached garage/shed following the construction of a single storey side & rear extension and a ...

Full Planning Slough 25 Jun 2026
P/17418/003 24 Jun 2026 Registered

18, Barton Road, Slough, SL3 8DF

Construction of a single storey rear extension following demolition of existing garage.

Full Planning Slough 24 Jun 2026
Y/21074/000 23 Jun 2026 Registered application

43, Crofthill Road, Slough, SL2 1HG

The erection of two single storey rear extensions, which would extend beyond the rear wall of the original house by 6m, with a maximum height of 3m, a...

Permitted Development with Consultation Slough 23 Jun 2026
P/10403/003 23 Jun 2026 Registered application

55, Raymond Road, Slough, SL3 8LN

Demolition of existing garage and construction of new garage, garden store and summer house

Full Planning Slough 23 Jun 2026
Y/21082/000 22 Jun 2026 Decided

25, Oatlands Drive, Slough, SL1 3EH

The erection of a single storey rear extension, which would extend beyond the rear wall of the original house by 3.00m, with a maximum height of 3.50m...

Permitted Development with Consultation Slough 22 Jun 2026
P/20244/003 22 Jun 2026 Registered

51, Cromwell Drive, Slough, SL1 3ND

Construction of an ancillary outbuilding for use as a home gym, office and associated incidental residential purposes.

Full Planning Slough 22 Jun 2026
P/06785/005 22 Jun 2026 Registered application

234, Trelawney Avenue, Slough, SL3 7UD

Construction of a single storey rear extension

Full Planning Slough 22 Jun 2026
S/21094/000 19 Jun 2026 Registered application

4, Stratford Close, Slough, SL2 2PS

Construction of a proposed single storey rear extension to existing dwelling.

Full Planning Slough 19 Jun 2026
P/13602/003 19 Jun 2026 Registered application

286, Stoke Poges Lane, Slough, SL1 3LL

Construction of a front porch, single storey rear and side extension following the demolition existing rear extension

Full Planning Slough 19 Jun 2026
P/21092/000 18 Jun 2026 Registered application

40, Ember Road, Slough, SL3 8ED

Lawful Development Certificate for a proposed hip to gable loft conversion to create habitable accommodation with rear dormer extension and 2no. roofl...

Certificate Proposed (Use/Development) Slough 18 Jun 2026
Y/21093/000 18 Jun 2026 Registered application

22, St Elmo Crescent, Slough, SL2 1NN

The erection of a single storey rear extension, which would extend beyond the rear wall of the original house by 6m, with a maximum height of 3m, and ...

Permitted Development with Consultation Slough 18 Jun 2026
P/05455/002 18 Jun 2026 Registered application

91, Farnham Lane, Slough, SL2 2AT

Lawful development certificate for the proposed replacement and enlargement of existing side dormer window, new permeable hard surfacing and 1m high f...

Certificate Proposed (Use/Development) Slough 18 Jun 2026
P/09222/002 17 Jun 2026 Registered application

60, Upton Court Road, Slough, SL3 7LZ

Construction of part single, part two storey front, side and rear extensions including conversion of existing garage, construction of two storey front...

Full Planning Slough 17 Jun 2026
P/12732/002 17 Jun 2026 Registered application

15, Kennett Road, Slough, SL3 8EQ

Construction of a proposed single storey front extension and garage conversion to create habitable accommodation.

Full Planning Slough 17 Jun 2026
P/20555/001 17 Jun 2026 Registered application

33, Bowyer Drive, Slough, SL1 5EB

Construction of a part first floor rear extension with gable pitched roof

Full Planning Slough 17 Jun 2026
P/03260/003 16 Jun 2026 Registered application

82, Seacourt Road, Slough, SL3 8EW

Construction of a proposed part single storey, part two storey side and rear extension to existing dwelling following demolition of existing outbuildi...

Full Planning Slough 16 Jun 2026
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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 Slough?
Yes. Click "Set up alerts" on this page and you'll get a daily or weekly email listing every new extensions application published by Slough. You can also narrow the alert to a postcode, street, or drawn area.

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