House extensions in Windsor and Maidenhead

Windsor and Maidenhead received 920 householder applications in the last 12 months - about 18 a week. Rear extensions and dormers are the most common. Of the 605 decided so far, 452 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 331 applications
Yesterday Awaiting decision 26/01734/FULL

The Spinney Fifield Road Fifield Maidenhead SL6 2NX

Hip to gable, raising of the ridge, 1no. front dormer and 1no. rear dormer with Juliet balcony.

Full Windsor And Maidenhead
2 days ago Awaiting decision 26/01871/FULL

Poplars Southlea Road Datchet Slough SL3 9DB

Replacement dwelling with solar panels and refuse and cycle storage, 2no. air source heat pumps, solar panels and alterations to the existing detached...

Full Windsor And Maidenhead
2 days ago Awaiting decision 26/02000/FULL

1 Fane Way Maidenhead SL6 2TN

Part single part two storey part first floor side extension and loft conversion with 1no. rear dormer.

Full Windsor And Maidenhead
2 days ago Awaiting decision 26/02094/LBC

22 Prince Consort Cottages Windsor SL4 1JB

Consent for the replacement of external render plinth, removal of Shriver vents and part demolition and reconfiguration of an internal wall at ground ...

Listed Building Consent Windsor And Maidenhead
2 days ago Awaiting decision 26/02147/PDXL

16 Pinecote Drive Sunningdale Ascot SL5 9PS

Single storey rear extension no greater than 4.78m in depth, 3.13m high with an eaves height of 2.93m.

Permitted Development Extended Windsor And Maidenhead
2 days ago Awaiting decision 26/02237/VAR

Netley 105 Altwood Road Maidenhead SL6 4QD

Variation (under Section 73A) of Condition 3 (Approved Plans) to substitute those plans approved under 24/00979/FULL for a single storey rear extensio...

Variation Under Reg 73 Windsor And Maidenhead
2 days ago Awaiting decision 26/02230/CPD

15 Castle Avenue Datchet Slough SL3 9BA

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

Cert of Lawfulness of Proposed Dev Windsor And Maidenhead
2 days ago Awaiting decision 26/02180/FULL

5 Braemar Waltham Road White Waltham Maidenhead SL6 3SH

Single storey rear extension.

Full Windsor And Maidenhead
8 Sept 2026 Awaiting decision 26/02176/PDXL

150 Wolf Lane Windsor SL4 4YZ

Single storey rear extension no greater than 6.00m in depth, 2.67m high with an eaves height of 2.67m.

Permitted Development Extended Windsor And Maidenhead
7 Sept 2026 Awaiting decision 26/02205/CPD

15 Warrington Spur Old Windsor Windsor SL4 2NF

Certificate of lawfulness to determine whether the proposed new driveway is lawful.

Cert of Lawfulness of Proposed Dev Windsor And Maidenhead
7 Sept 2026 Awaiting decision 26/02106/FULL

Meadow View Oakley Green Road Oakley Green Windsor SL4 4QF

Single storey front extension with first floor balcony over entrance porch, alterations to fenestration and external finish following demolition of ex...

Full Windsor And Maidenhead
7 Sept 2026 Awaiting decision 26/02047/FULL

10 Gables Close Datchet Slough SL3 9BB

Part single part two storey side/rear extension, alterations to fenestration and a replacement detached garage following the demolition of the existin...

Full Windsor And Maidenhead
7 Sept 2026 Awaiting decision 26/02132/FULL

Huston Cottage Moneyrow Green Holyport Maidenhead SL6 2ND

Single storey rear extension.

Full Windsor And Maidenhead
7 Sept 2026 Awaiting decision 26/02156/FULL

1 Farm Yard Windsor SL4 1QL

Creation of additional storey for 1no. residential unit with roof terrace and balustrades following the demolition of the existing roof level plant ro...

Full Windsor And Maidenhead
7 Sept 2026 Awaiting decision 26/02149/FULL

12 Fairlea Maidenhead SL6 3AS

Garage conversion, single storey front/side extension with new porch and alterations to fenestration.

Full Windsor And Maidenhead
7 Sept 2026 Awaiting decision 26/02166/FULL

Old Ditton Furze Platt Road Maidenhead SL6 6NT

Single storey rear infill extension

Full Windsor And Maidenhead
7 Sept 2026 Awaiting decision 26/01819/FULL

Novello Theatre 2 High Street Sunninghill Ascot SL5 9NE

New front parapet wall and entrance canopy, two single storey side extensions, partial replacement of the ground floor side walls, creation of new con...

Full Windsor And Maidenhead
7 Sept 2026 Awaiting decision 26/02160/FULL

11 Huntsmans Meadow Ascot SL5 7PF

Relocation of the front entrance, new entrance canopy and screen, single storey extension to the south east elevation, single storey extension to the ...

Full Windsor And Maidenhead
4 Sept 2026 Awaiting decision 26/02181/CPD

21 Lincoln Road Maidenhead SL6 5HW

Certificate of lawfulness to determine whether the proposed single storey rear extension and 1no. rear dormer and 1no. rooflight are lawful.

Cert of Lawfulness of Proposed Dev Windsor And Maidenhead
4 Sept 2026 Awaiting decision 26/02190/FULL

18 Wellington Road Maidenhead SL6 6DQ

Single storey rear infill extension with internal floor to be levelled

Full Windsor And Maidenhead
4 Sept 2026 Awaiting decision 26/02182/FULL

Beekeepers Cottage Maidenhead Road Cookham Maidenhead SL6 9DF

Rear outbuilding with canopy over steps and decked platform

Full Windsor And Maidenhead
4 Sept 2026 Awaiting decision 26/02103/FULL

91 Lower Cookham Road Maidenhead SL6 8JY

Part single part two storey wrap around extension (front/side/rear) with new front entrance canopy, new roof, part raising of the ridge, loft conversi...

Full Windsor And Maidenhead
4 Sept 2026 Awaiting decision 26/02157/FULL

Craven Lodge Coronation Road Ascot SL5 9HF

Rear raised terrace and steps (Part Retrospective).

Full Windsor And Maidenhead
3 Sept 2026 Awaiting decision 26/02070/CPD

13 Princess Avenue Windsor SL4 3LU

Certificate of lawfulness to determine whether the proposed Use of the land for siting a mobile home for use ancillary to the main dwelling and the pr...

Cert of Lawfulness of Proposed Dev Windsor And Maidenhead
3 Sept 2026 Awaiting decision 26/02171/FULL

Lock Mead House 1 Lock Mead Maidenhead SL6 8HF

Detached timber wood store (Part-retrospective)

Full Windsor And Maidenhead
3 Sept 2026 Awaiting decision 26/02175/FULL

26 Burcot Gardens Maidenhead SL6 7UR

3no. front dormers and raising of the ridge to facilitate a loft conversion and alterations to fenestration following the removal of the existing elem...

Full Windsor And Maidenhead
3 Sept 2026 Awaiting decision 26/02170/PDXL

15 Cell Farm Avenue Old Windsor Windsor SL4 2PD

Single storey rear extension no greater than 5.00m in depth, 2.85m high with an eaves height of 2.85m and alterations to fenestration following demoli...

Permitted Development Extended Windsor And Maidenhead
3 Sept 2026 Awaiting decision 26/02045/FULL

Hucclecote Shoppenhangers Road Maidenhead SL6 2QE

Subdivision of Apartment 6 to form 2 no. apartments and alterations to fenestration (Retrospective)

Full Windsor And Maidenhead
3 Sept 2026 Awaiting decision 26/02142/FULL

7 Langdale Drive Ascot SL5 8TQ

Garage conversion, 1no. first floor side window and a detached garage.

Full Windsor And Maidenhead
2 Sept 2026 Awaiting decision 26/02155/FULL

4 Gordon Cottages Lock Lane Maidenhead SL6 3BU

Retrospective application for pergola.

Full Windsor And Maidenhead
2 Sept 2026 Awaiting decision 26/02119/FULL

7 Bolton Road Windsor SL4 3JW

Attached rear greenhouse and detached outbuilding following demolition of existing outbuilding.

Full Windsor And Maidenhead
2 Sept 2026 Awaiting decision 26/01346/FULL

Lebanese Village Windsor 41 Thames Street Windsor SL4 1PR

Replacement shopfront, single storey side/rear extension, extraction unit to rear elevation, 1no. bin store, new signage and alterations to external f...

Full Windsor And Maidenhead
2 Sept 2026 Awaiting decision 26/01981/FULL

Chasebury Brockenhurst Road Ascot SL5 9HA

Single storey side/rear orangery, following demolition of existing

Full Windsor And Maidenhead
1 Sept 2026 Awaiting decision 26/02095/FULL

37 Pinkneys Road Maidenhead SL6 5DX

Single storey rear/side extension and alterations to fenestration, following demolition of existing

Full Windsor And Maidenhead
1 Sept 2026 Awaiting decision 26/02154/FULL

2 Copthorn Close Maidenhead SL6 3PN

Two storey side extension

Full Windsor And Maidenhead
1 Sept 2026 Awaiting decision 26/01342/FULL

22 Beech Hill Road Ascot SL5 0BW

Front canopy, part single part two storey side/rear extension, 1no. rear dormer, 1no. dropped kerb and alterations to fenestration following demolitio...

Full Windsor And Maidenhead
28 Aug 2026 Awaiting decision 26/01840/FULL

195 Arthur Road Windsor SL4 1RZ

Single storey rear extension

Full Windsor And Maidenhead
28 Aug 2026 Awaiting decision 26/02145/FULL

105 Farmers Way Maidenhead SL6 3PU

Single storey rear extension

Full Windsor And Maidenhead
28 Aug 2026 Awaiting decision 26/01826/FULL

Cordes Hall High Street Sunninghill Ascot SL5 9NE

Single storey rear and infill extension to create a link to the Novello Theatre, new steps, 1no. covered rear access ramp with handrail, replacement o...

Full Windsor And Maidenhead
28 Aug 2026 Awaiting decision 26/01720/FULL

16 Powney Road Maidenhead SL6 6EF

New drop kerb.

Full Windsor And Maidenhead
28 Aug 2026 Awaiting decision 26/02099/FULL

Saffrons 8 Winkfield Road Windsor SL4 4BG

Replacement front canopy, 1no. front dormer, enlargement of the existing rear dormer and alterations to the external finish and fenestration following...

Full Windsor And Maidenhead
28 Aug 2026 Awaiting decision 26/02111/FULL

Autumn Haze Cheapside Road Ascot SL5 7QH

New front entrance porch and alterations new roof covering.

Full Windsor And Maidenhead
27 Aug 2026 Awaiting decision 26/01830/FULL

20 Magna Carta Lane Wraysbury Staines TW19 5AF

Installation of a connecting pitched roof between 2no. sheds to create an additional covered car port. (Retrospective)

Full Windsor And Maidenhead
27 Aug 2026 Awaiting decision 26/02044/LBC

Castle Hotel Windsor 18 High Street Windsor SL4 1LJ

Consent for new and replacement signage and external painting of the entrance doors and existing window frames.

Listed Building Consent Windsor And Maidenhead
27 Aug 2026 Awaiting decision 26/02090/FULL

Tamarisk Fishery Road Maidenhead SL6 1UN

Single storey rear extension, alterations to fenestration and rear raised decking with steps and balustrade following the demolition of the existing e...

Full Windsor And Maidenhead
27 Aug 2026 Awaiting decision 26/01914/LBC

Castle Hotel Windsor 18 High Street Windsor SL4 1LJ

Consent for replacement seating, entrance gate and front screening, planters. New ground surface with resin-bound gravel, decorative ceiling awning, n...

Listed Building Consent Windsor And Maidenhead
27 Aug 2026 Awaiting decision 26/01913/FULL

Castle Hotel Windsor 18 High Street Windsor SL4 1LJ

Removal of existing garden fixtures and fittings and provision of replacement seating, entrance gate and front screening, planters. New ground surface...

Full Windsor And Maidenhead
27 Aug 2026 Awaiting decision 26/01994/FULL

Angelos Eton College Common Lane Eton Windsor SL4 6EH

Part demolition of existing single storey elements, erection of part single part three storey extensions to the south and south-east elevation, new wi...

Full Windsor And Maidenhead
27 Aug 2026 Awaiting decision 26/02077/FULL

187 Clare Road Maidenhead SL6 4DL

Single storey rear extension and alterations to fenestration.

Full Windsor And Maidenhead
26 Aug 2026 Awaiting decision 26/02120/FULL

51 Upper Village Road Ascot SL5 7AJ

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

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.