House extensions in Windsor and Maidenhead

Windsor and Maidenhead received 1,195 householder applications in the last 12 months - about 23 a week. Rear extensions and side extensions are the most common. Of the 887 decided so far, 678 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 298 applications
23 Oct 2026 Awaiting decision 26/02598/CPD

Marina 42 Highfield Lane Maidenhead SL6 3AP

Certificate of lawfulness to determine whether the proposed rear dormer to facilitate a loft conversion is lawful.

Cert of Lawfulness of Proposed Dev Windsor And Maidenhead
22 Oct 2026 Awaiting decision 26/02589/FULL

14 Park Avenue Wraysbury Staines TW19 5ET

Single storey front extension, raised ridge with new first floor with rear balcony, new front/side canopy, integrated side carport, alterations to fen...

Full Windsor And Maidenhead
22 Oct 2026 Awaiting decision 26/02578/FULL

54 Farm Road Maidenhead SL6 5JD

Single storey front extension.

Full Windsor And Maidenhead
22 Oct 2026 Awaiting decision 26/02584/FULL

16 Pinecote Drive Sunningdale Ascot SL5 9PS

Single storey rear extension.

Full Windsor And Maidenhead
22 Oct 2026 Awaiting decision 26/02504/FULL

Chante Peace Lane Cookham Maidenhead SL6 9NL

Extension, raising of roof and conversion of existing garage to form habitable accommodation and alterations to fenstration.

Full Windsor And Maidenhead
22 Oct 2026 Awaiting decision 26/02389/FULL

15 Cornwall Close Eton Wick Windsor SL4 6NB

Front porch, single storey side/rear extension, alterations to the external finish and fenestration and widening of the existing drop kerb following t...

Full Windsor And Maidenhead
22 Oct 2026 Awaiting decision 26/02399/FULL

Flaxman 50 Peascod Street Windsor SL4 1DE

Installation of a roller shutter (Retrospective)

Full Windsor And Maidenhead
22 Oct 2026 Awaiting decision 26/02355/FULL

12 Newbury Drive Maidenhead SL6 1XG

Part garage conversion, single storey front extension, first floor side extension, new steps and alterations to fenestration.

Full Windsor And Maidenhead
21 Oct 2026 Awaiting decision 26/02577/FULL

32 Sutherland Chase Ascot SL5 8TF

Garage Conversion to a Habitable Space

Full Windsor And Maidenhead
21 Oct 2026 Awaiting decision 26/02566/FULL

Canzona Ascot Road Holyport Maidenhead SL6 2HY

Single storey rear extension, new rear steps and alterations to fenestration.

Full Windsor And Maidenhead
21 Oct 2026 Awaiting decision 26/02548/FULL

19 Hargrave Road Maidenhead SL6 6JR

Part single part two single wrap around extension (front/side/rear), loft conversion with 1no. rear dormer, roof alterations and changes to fenestrati...

Full Windsor And Maidenhead
21 Oct 2026 Awaiting decision 26/02531/FULL

Kam Kottage Langworthy Lane Holyport Maidenhead SL6 2HH

Single storey side/rear extension following the demolition of the existing single storey elements.

Full Windsor And Maidenhead
21 Oct 2026 Awaiting decision 26/02294/FULL

Temple Golf Club Henley Road Hurley Maidenhead SL6 5LH

Construction of a new external terrace with a louvred pergola, replacement of the flat roof and alterations to external finishes following removal of ...

Full Windsor And Maidenhead
20 Oct 2026 Awaiting decision 26/02561/CPD

163 Arthur Road Windsor SL4 1RZ

Certificate of lawfulness to determine whether the proposed rear L shaped dormer with Juliette balcony is lawful.

Cert of Lawfulness of Proposed Dev Windsor And Maidenhead
20 Oct 2026 Awaiting decision 26/02560/FULL

163 Arthur Road Windsor SL4 1RZ

Single storey rear extension.

Full Windsor And Maidenhead
20 Oct 2026 Awaiting decision 26/02542/FULL

51 Lowbrook Drive Maidenhead SL6 3XS

Single storey rear extension with parapet wall.

Full Windsor And Maidenhead
20 Oct 2026 Awaiting decision 26/02438/FULL

251 St Leonards Road Windsor SL4 3DR

Single storey side/rear extension following demolition of existing conservatory.

Full Windsor And Maidenhead
19 Oct 2026 Awaiting decision 26/02551/FULL

Mason Bridge School West Road Maidenhead SL6 1PD

New front entrance doors, single storey rear extension, alterations to fenestration, new and replacement fencing and gates, hard surfacing and signage...

Full Windsor And Maidenhead
19 Oct 2026 Awaiting decision 26/02539/CPD

Winbar 58 Llanvair Drive Ascot SL5 9LN

Certificate of lawfulness to determine whether the proposed laying of a new hard surface is lawful.

Cert of Lawfulness of Proposed Dev Windsor And Maidenhead
19 Oct 2026 Awaiting decision 26/02533/CPD

15 Haddon Road Maidenhead SL6 4RA

Certificate of lawfulness to determine whether the proposed single storey side extension is lawful.

Cert of Lawfulness of Proposed Dev Windsor And Maidenhead
19 Oct 2026 Awaiting decision 26/02534/CPD

Woodland 23D Murray Court Ascot SL5 9BP

Certificate of lawfulness to determine whether the proposed single storey rear extension following the removal of the existing conservatory is lawful.

Cert of Lawfulness of Proposed Dev Windsor And Maidenhead
19 Oct 2026 Awaiting decision 26/02517/CPD

Eastmere The Street Shurlock Row Reading RG10 0PS

Certificate of lawfulness to determine whether the proposed detached outbuilding incidental to the main dwelling is lawful.

Cert of Lawfulness of Proposed Dev Windsor And Maidenhead
19 Oct 2026 Awaiting decision 26/02381/CPD

Oak Cottage West End Road Waltham St Lawrence Reading RG10 0NL

Certificate of lawfulness to determine whether the proposed outbuilding incidental to the main dwelling following the demolition of the existing outbu...

Cert of Lawfulness of Proposed Dev Windsor And Maidenhead
19 Oct 2026 Awaiting decision 26/02506/FULL

14 Alexandra Road Windsor SL4 1HN

Alterations to fenestration to the rear and side elevation.

Full Windsor And Maidenhead
16 Oct 2026 Awaiting decision 26/02528/CPD

1 Oldershaw Mews Maidenhead SL6 5HB

Certificate of lawfulness to determine whether the proposed integral garage conversion to habitable accommodation and alterations to fenestration and ...

Cert of Lawfulness of Proposed Dev Windsor And Maidenhead
16 Oct 2026 Awaiting decision 26/02519/FULL

John Torrid Farm Beenhams Heath Shurlock Row Reading RG10 0QQ

Proposed extension to existing Agricultural/ Class E Building.

Full Windsor And Maidenhead
16 Oct 2026 Awaiting decision 26/02512/FULL

4 Cuba Cottages Maidenhead Court Park Maidenhead SL6 8HW

Single storey front extension following demolition of existing conservatory.

Full Windsor And Maidenhead
15 Oct 2026 Awaiting decision 26/02466/FULL

Old Gunsbrook House Twyford Road Waltham St Lawrence Reading RG10 0HE

Installation of 2no. garage doors to an existing four bay garage at Old Gunsbrook House

Full Windsor And Maidenhead
15 Oct 2026 Awaiting decision 26/02458/FULL

74 Illingworth Windsor SL4 4UP

First floor rear extension with 1no. bay window, raising of the ridge and 3no. dormers to facilitate a loft conversion and alterations to fenestration...

Full Windsor And Maidenhead
15 Oct 2026 Awaiting decision 26/02426/FULL

1 Aston Mead Windsor SL4 5PW

Replacement single storey rear extension and alterations to fenestration.

Full Windsor And Maidenhead
14 Oct 2026 Awaiting decision 26/02113/FULL

Dudley Court Clewer Hill Road Windsor

Demolition and rebuild of existing garage block due to structural damage. (9no garages)

Full Windsor And Maidenhead
14 Oct 2026 Awaiting decision 26/02487/PDXL

1 Cross Road Cottages Henley Road Maidenhead SL6 6QW

Single storey side/rear extension no greater than 4.54m in depth, 3.23m high with an eaves height of 2.78m.

Permitted Development Extended Windsor And Maidenhead
13 Oct 2026 Awaiting decision 26/02473/LBC

Old Gunsbrook House Twyford Road Waltham St Lawrence Reading RG10 0HE

Consent for the installation of 2no. garage doors to an existing four bay garage at Old Gunsbrook House.

Listed Building Consent Windsor And Maidenhead
13 Oct 2026 Awaiting decision 26/02444/FULL

7 Forest View Cottages Forest Green Road Holyport Maidenhead SL6 2NS

Single storey front extension, front dormer, two storey rear extension with parapet walls and 2 No Juliet balconies and alterations to fenestration.

Full Windsor And Maidenhead
13 Oct 2026 Awaiting decision 26/02396/CPD

Old Malt House Cottage Shurlock Row Reading RG10 0PL

Certificate of lawfulness to determine whether the proposed improvement to the existing outbuilding to include new solar panels, 1no. ASHP and alterat...

Cert of Lawfulness of Proposed Dev Windsor And Maidenhead
13 Oct 2026 Awaiting decision 26/02441/FULL

25 - 27 Fairfield Avenue Datchet Slough SL3 9NQ

Part two storey/part first floor side/rear extension and single storey front extension at No.27 and First floor rear extension at No.25.

Full Windsor And Maidenhead
13 Oct 2026 Awaiting decision 26/02321/FULL

119 New Road Ascot SL5 8PZ

Part single part two storey side/rear extension, rear Juliet balcony, new drop kerb and alterations to fenestration.

Full Windsor And Maidenhead
12 Oct 2026 Awaiting decision 26/02494/FULL

56 Bolton Road Windsor SL4 3JL

Single storey side/rear extension.

Full Windsor And Maidenhead
12 Oct 2026 Awaiting decision 26/02469/FULL

4 Vivien Close Cookham Maidenhead SL6 9DQ

Single storey side extension and alterations to garden, landscaping and new steps, following demolition of existing side extension.

Full Windsor And Maidenhead
12 Oct 2026 Awaiting decision 26/02451/FULL

10 Wickhurst Cottage Bath Road Littlewick Green Maidenhead SL6 3RQ

Single storey side/rear extension.

Full Windsor And Maidenhead
12 Oct 2026 Awaiting decision 26/02144/FULL

Land Adjacent To 91 Meadow Way Old Windsor Windsor

Single storey detached garage, and alterations to front boundary treatment, following the demolition of an existing garage and shed.

Full Windsor And Maidenhead
12 Oct 2026 Awaiting decision 26/02202/LBC

15 High Street And 2 Guards View 16 High Street Windsor

Consent for removal of the existing pitched roof for the construction of an external balcony with steps and balustrade and the replacement of existing...

Listed Building Consent Windsor And Maidenhead
9 Oct 2026 Awaiting decision 26/02467/CPD

11 Hampden Road Maidenhead SL6 5HQ

Certificate of lawfulness to determine whether the proposed 1no. rear dormer to facilitate a loft conversion is lawful.

Cert of Lawfulness of Proposed Dev Windsor And Maidenhead
9 Oct 2026 Awaiting decision 26/02415/FULL

Persimmon Homes (Thames Valley) Persimmon House Vanwall Road Maidenhead SL6 4UB

Alterations to the external finish and fenestration including 1no. automatic opening vent rooflight, following demolition of existing elements and rel...

Full Windsor And Maidenhead
9 Oct 2026 Awaiting decision 26/02313/FULL

50 Queen Street Maidenhead SL6 1QF

Replacement of external glazed double swing doors with glazed double sliding doors and one glazed shopfront section and security cameras.

Full Windsor And Maidenhead
8 Oct 2026 Refused 14 Oct 26/30017/SMI

85 West Street Marlow SL7 2BS

Householder application for removal of existing uPVC conservatory and replacement with a new garden room, enlargement of the rear windows, replacement...

Spheres of Mutual Interest Windsor And Maidenhead
8 Oct 2026 Awaiting decision 26/02461/FULL

21 Aldebury Road Maidenhead SL6 7EY

Single storey side extension and alterations to fenestration.

Full Windsor And Maidenhead
8 Oct 2026 Awaiting decision 26/02437/FULL

Littlebrook House Earleydene Ascot SL5 9JY

Front extension with gable, single storey rear extension, alterations to the external finish and fenestration and minor enlargement of the existing re...

Full Windsor And Maidenhead
8 Oct 2026 Awaiting decision 26/02359/LBC

Claires Accessories 33 Peascod Street Windsor SL4 1EA

Consent for internal and external alterations including removal of wall partitions, suspended ceilings, central ground floor step, and alterations to ...

Listed Building Consent Windsor And Maidenhead
8 Oct 2026 Awaiting decision 26/02295/FULL

15 Warrington Spur Old Windsor Windsor SL4 2NF

New front porch (Retrospective).

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

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