House extensions in Windsor and Maidenhead

Windsor and Maidenhead received 421 householder applications in the last 12 months - about 8 a week. Rear extensions and side extensions are the most common. Of the 220 decided so far, 165 were approved. If you're planning your own, the applications below show what people nearby applied for and how the council decided.

262 last 90 days
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68 last 30 days
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21 last 14 days

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Showing 50 of 262 applications
26/01642/FULL 8 Jul 2026 Awaiting decision

Lowbrook Academy The Fairway Maidenhead SL6 3AS

Single storey rear extension to enlarge the existing 2no. classrooms.

Windsor And Maidenhead 8 Jul 2026
26/01628/FULL 7 Jul 2026 Awaiting decision

25 Bannard Road Maidenhead SL6 4NP

Single storey rear extension following the demolition of the existing conservatory.

Full Windsor And Maidenhead 7 Jul 2026
26/01646/PDXL 7 Jul 2026 Awaiting decision

12 Islet Park Drive Maidenhead SL6 8LF

Single storey rear extension no greater than 5.30m in depth, 3.88m high with an eaves height of 2.61m and partial garage conversion.

Windsor And Maidenhead 7 Jul 2026
26/01641/CONDIT 7 Jul 2026 Awaiting decision

7 To 13 And Land At Penyston Road Maidenhead SL6 6EJ

Details required by Condition 9 (Air Source Heat Pumps) and Condition 10 (Photovoltaic Panels) of planning permission 24/00577/FULL for a single store...

Windsor And Maidenhead 7 Jul 2026
26/01588/FULL 2 Jul 2026 Awaiting decision

46 Spencers Road Maidenhead SL6 6LN

Single storey rear extension following the demolition of the existing single storey rear element.

Full Windsor And Maidenhead 2 Jul 2026
26/01621/CONDIT 2 Jul 2026 Awaiting decision

Braywick House 14 Windsor Road Maidenhead SL6 1DN

Details required by Condition 12 (Parking and Turning Layout); Condition 13 (Car Park Management Plan); Condition 16 (Pedestrian Access) and Condition...

Discharge of Condition Windsor And Maidenhead 2 Jul 2026
26/01574/FULL 2 Jul 2026 Awaiting decision

Windsor Centre of Acupuncture 5A St Leonards Road Windsor SL4 3BN

Change of use of the first and second floors from business (Use Class E) to a 4 bed HMO (House in Multiple Occupation) (Use Class C4) with alterations...

Full Windsor And Maidenhead 2 Jul 2026
26/01548/FULL 2 Jul 2026 Awaiting decision

1 Newberry Crescent Windsor SL4 5SN

Partial garage conversion, part single part two storey side/rear extension and alterations to fenestration.

Full Windsor And Maidenhead 2 Jul 2026
26/01573/FULL 2 Jul 2026 Awaiting decision

4 Mafeking Road Wraysbury Staines TW19 5AL

1no. rear dormer, 2no. front rooflights and roof alterations to facilitate a loft conversion following the removal of the existing chimney.

Full Windsor And Maidenhead 2 Jul 2026
26/01575/FULL 1 Jul 2026 Awaiting decision

Huntsmans House Church Road Cookham Dean Maidenhead SL6 9PG

Part conversion and extension of the existing car port to form a pool house and plant room, alterations to fenestration, 1no. sunken swimming pool and...

Full Windsor And Maidenhead 1 Jul 2026
26/01607/FULL 1 Jul 2026 Awaiting decision

Orchard House St Leonards Hill Windsor SL4 4AJ

First floor rear extension

Full Windsor And Maidenhead 1 Jul 2026
26/01608/CPD 1 Jul 2026 Awaiting decision

Orchard House St Leonards Hill Windsor SL4 4AJ

Certificate of lawfulness to determine whether the proposed conversion of loft space to habitable accommodation with 2No. roof balcony windows and 2No...

Cert of Lawfulness of Proposed Dev Windsor And Maidenhead 1 Jul 2026
26/01538/FULL 1 Jul 2026 Awaiting decision

15 To16 Peascod Street And Land To The Rear Peascod Street Windsor SL4 1DU

Conversion of the existing first floor residential unit to include new first floor rear extension and additional storeys with accommodation in roof sp...

Full Windsor And Maidenhead 1 Jul 2026
26/01494/FULL 1 Jul 2026 Awaiting decision

Cedar House The Straight Mile Shurlock Row Reading RG10 0QP

Demolition of existing storage shed and alterations to internal layout and fenestration to the existing detached outbuilding and use as ancillary resi...

Full Windsor And Maidenhead 1 Jul 2026
26/01614/FULL 1 Jul 2026 Awaiting decision

Trade Winds Monks Drive Ascot SL5 9BB

Guardrail and replacement rooflight to the existing roof.

Full Windsor And Maidenhead 1 Jul 2026
26/01609/CPD 1 Jul 2026 Awaiting decision

26 Lawn Close Datchet Slough SL3 9JZ

Certificate of lawfulness to determine whether the proposed hip to gable and 1no. rear dormer following the removal of the existing chimney is lawful.

Cert of Lawfulness of Proposed Dev Windsor And Maidenhead 1 Jul 2026
26/01597/CPD 30 Jun 2026 Awaiting decision

41 Walker Road Maidenhead SL6 2QU

Certificate of lawfulness to determine whether the proposed garage conversion incidental to the main dwelling is lawful.

Cert of Lawfulness of Proposed Dev Windsor And Maidenhead 30 Jun 2026
26/01519/FULL 29 Jun 2026 Awaiting decision

Sarum House 96 Highfield Lane Maidenhead SL6 3PF

Single storey front extension with canopy, single storey rear extension with flue and alterations to existing flat roof.

Full Windsor And Maidenhead 29 Jun 2026
26/01592/PDXL 29 Jun 2026 Awaiting decision

Chandlers Hills Lane Cookham Maidenhead SL6 9NT

Single storey rear extension no greater than 8.00m in depth, 4.00m high with an eaves height of 3.00m.

Permitted Development Extended Windsor And Maidenhead 29 Jun 2026
26/01591/CPD 29 Jun 2026 Awaiting decision

Half Acre Orchard Paley Street Maidenhead SL6 3JS

Certificate of lawfulness to determine whether the proposed dormer with Juliet balcony to the south elevation and 2no. rooflights to the north elevati...

Cert of Lawfulness of Proposed Dev Windsor And Maidenhead 29 Jun 2026
26/01480/FULL 29 Jun 2026 Awaiting decision

5 Fox Covert Close Ascot SL5 9PA

Enlargement of the existing rear dormer

Full Windsor And Maidenhead 29 Jun 2026
26/01529/FULL 26 Jun 2026 Awaiting decision

51 Choseley Road Knowl Hill Reading RG10 9YS

Single storey rear extension with flue and single storey side extension following demolition of the existing garage and conservatory

Full Windsor And Maidenhead 26 Jun 2026
26/01578/CONDIT 26 Jun 2026 Awaiting decision

RCCG Praise Embassy Haywards Mead Eton Wick Windsor SL4 6JN

Details required by Condition (4) (Reasonable Avoidance Method Statement) (5) (Biodiversity Enhancements) (6) (Tree Protection Plan) of planning permi...

Discharge of Condition Windsor And Maidenhead 26 Jun 2026
26/01579/CPD 26 Jun 2026 Awaiting decision

30 Harcourt Road Windsor SL4 5LZ

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

Cert of Lawfulness of Proposed Dev Windsor And Maidenhead 26 Jun 2026
26/01532/CPD 25 Jun 2026 Awaiting decision

72 Highway Avenue Maidenhead SL6 5AQ

Certificate of Lawfulness to determine whether the proposed rear dormer roof extension and associated internal alterations to enlarge the existing lof...

Cert of Lawfulness of Proposed Dev Windsor And Maidenhead 25 Jun 2026
26/01560/CONDIT 25 Jun 2026 Awaiting decision

Mount Farm House Mount Farm Choke Lane Maidenhead SL6 6PL

Details required by Condition 2 (Materials) and Condition 3 (Biodiversity Enhancements) of planning permission 26/00361/FULL for a single storey rear ...

Discharge of Condition Windsor And Maidenhead 25 Jun 2026
26/01570/FULL 25 Jun 2026 Awaiting decision

50 York Road Windsor SL4 3NY

Single storey side/rear extension with accommodation within the roof space, hip to gable, 1no. front dormer, PV panels, 1no. flue, new gate and piers,...

Full Windsor And Maidenhead 25 Jun 2026
26/01564/CPD 25 Jun 2026 Awaiting decision

Long Chase Farm Ascot Road Holyport Maidenhead SL6 3LA

Rear two storey extension to Long Chase Farmhouse under Class A of Part 1 of the GPDO 2015,As Amended.

Cert of Lawfulness of Proposed Dev Windsor And Maidenhead 25 Jun 2026
26/01525/PDXL 24 Jun 2026 Awaiting decision

Eton Manor 60 Eton Road Datchet Slough SL3 9AY

Single storey rear extension no greater than 6.00m in depth, 3.00m high with an eaves height of 2.75m.

Permitted Development Extended Windsor And Maidenhead 24 Jun 2026
26/01551/FULL 24 Jun 2026 Awaiting decision

16A Camley Gardens Maidenhead SL6 5JW

Single storey side extension and single storey rear extension, following demolition of existing conservatory

Full Windsor And Maidenhead 24 Jun 2026
26/01507/FULL 24 Jun 2026 Awaiting decision

42 Twynham Road Maidenhead SL6 5AS

Single storey side/rear extension, front roof canopy, modification and raising of the existing roof to extend existing loft space, new roof lights, PV...

Full Windsor And Maidenhead 24 Jun 2026
26/01497/FULL 24 Jun 2026 Awaiting decision

7 Roseleigh Close Maidenhead SL6 5AJ

Single storey side extension with relocated front door, hip to gable, 2 no. front rooflights and 1 no. rear dormer, following demolition of existing e...

Full Windsor And Maidenhead 24 Jun 2026
26/01492/CONDIT 24 Jun 2026 Awaiting decision

The Chequers Dean Lane Cookham Maidenhead SL6 9BQ

Details required by Condition 2 (Materials), 4 (Soft landscaping), 5 (ASHP), 10 (Biodiversity enhancements) and 12 (Sustainability) of planning permis...

Discharge of Condition Windsor And Maidenhead 24 Jun 2026
26/01439/FULL 24 Jun 2026 Awaiting decision

35 Burnt Oak Cookham Maidenhead SL6 9RN

Single storey front extension and part single part two storey, part first floor side/rear extension following demolition of the existing garage.

Full Windsor And Maidenhead 24 Jun 2026
26/01555/FULL 24 Jun 2026 Awaiting decision

11 Church View White Waltham Maidenhead SL6 3JQ

Single storey front porch, single storey rear/side extension and alterations to fenestration following demolition of existing front element.

Full Windsor And Maidenhead 24 Jun 2026
26/01552/FULL 24 Jun 2026 Awaiting decision

77 St Marks Road Maidenhead SL6 6DT

Single storey rear extension, loft conversion, alterations to fenestration, blocking up a driveway with new boundary treatment, new bin store, soft an...

Full Windsor And Maidenhead 24 Jun 2026
26/01545/PDXL 23 Jun 2026 Awaiting decision

29 Ross Road Maidenhead SL6 2SS

Single storey rear extension no greater than 5.00m in depth, 2.68m high with an eaves height of 2.68m and relocate side access door.

Permitted Development Extended Windsor And Maidenhead 23 Jun 2026
26/01490/FULL 23 Jun 2026 Awaiting decision

21 College Avenue Maidenhead SL6 6AR

Construction of a new front boundary wall and wrought iron gates to vehicle access, following demolition of existing front boundary wall and wrought i...

Full Windsor And Maidenhead 23 Jun 2026
26/01462/FULL 23 Jun 2026 Awaiting decision

Mendota Stone House Lane Cookham Maidenhead SL6 9TP

Replacement front canopy and rear balcony, patio area to be levelled, alterations to the rear roof, fenestration and external finishes.

Full Windsor And Maidenhead 23 Jun 2026
26/01367/LBC 22 Jun 2026 Awaiting decision

St Marks Hospital 112 St Marks Road Maidenhead SL6 6DU

Consent for alteration to the front entrance door to Block 6.

Listed Building Consent Windsor And Maidenhead 22 Jun 2026
26/01528/CPD 22 Jun 2026 Awaiting decision

Foxley Manor Forest Green Road Holyport Maidenhead SL6 2NW

Certificate of lawfulness to determine whether the proposed erection of an outbuilding is lawful.

Cert of Lawfulness of Proposed Dev Windsor And Maidenhead 22 Jun 2026
26/01531/FULL 22 Jun 2026 Awaiting decision

46 Barn Drive Maidenhead SL6 3PR

Single storey side extension, single and first floor rear extension, relocation of entrance door, porch canopy, garage conversion with roof lantern, r...

Full Windsor And Maidenhead 22 Jun 2026
26/01481/FULL 22 Jun 2026 Awaiting decision

109 Welley Road Wraysbury Staines TW19 5HQ

New front canopy, single storey side/rear extension and creation of a first floor following demolition of existing elements

Full Windsor And Maidenhead 22 Jun 2026
26/01477/FULL 22 Jun 2026 Awaiting decision

Bodies Under Construction Windsor Essex Lodge 69 Osborne Road Windsor SL4 3EQ

New front canopy with new signage, entrance ramp and steps with railings, alterations to fenestration.

Full Windsor And Maidenhead 22 Jun 2026
26/01437/FULL 19 Jun 2026 Awaiting decision

54 Farm Road Maidenhead SL6 5JD

Part raised ridge and hip to gable, 4 no. front rooflights and 1 no. rear dormer

Full Windsor And Maidenhead 19 Jun 2026
26/01518/CONDIT 19 Jun 2026 Awaiting decision

Dingley Cottage Halls Lane Waltham St Lawrence Reading RG10 0JB

Details required by Condition 3 (fenestration) of planning permission 26/00359/FULL for a Single storey front extension, addition of masonry wall and ...

Discharge of Condition Windsor And Maidenhead 19 Jun 2026
26/01511/FULL 19 Jun 2026 Awaiting decision

6 Amberley Court Maidenhead SL6 8LJ

Ground floor single storey rear extension

Full Windsor And Maidenhead 19 Jun 2026
26/01461/FULL 19 Jun 2026 Awaiting decision

19A Bridle Road Maidenhead SL6 7RU

New pedestrian access, gate and new parking layout to enable conversion of a 2 bed dwelling to a 3 bed dwelling.

Full Windsor And Maidenhead 19 Jun 2026
26/01476/FULL 18 Jun 2026 Awaiting decision

Orchard House The Street Waltham St Lawrence Reading RG10 0JH

1 no. rear dormer

Full Windsor And Maidenhead 18 Jun 2026
26/01486/FULL 18 Jun 2026 Awaiting decision

Walnut Tree Cottage Knowl Hill Common Knowl Hill Reading RG10 9YD

Part two storey part first floor extension with 2no. side dormers to southwest elevation and alterations to fenestration following demolition of exist...

Full Windsor And Maidenhead 18 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 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.