House extensions in South Cambridgeshire

South Cambridgeshire received 870 householder applications in the last 12 months - about 17 a week. Rear extensions and garage works are the most common. Of the 682 decided so far, 661 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 198 applications
22 Oct 2026 Awaiting decision 26/03989/CL2PD

41B Lambs Lane Cottenham Cambridgeshire CB24 8TB

Certificate of lawfulness under S192 for a single storey rear extension.

Lawful Use Certificate (S192) South Cambridgeshire
21 Oct 2026 Awaiting decision 26/03976/PRIOR

Scotland Farm Scotland Road Dry Drayton Cambridgeshire CB23 8AU

Steel framed portal end extension to existing agricultural spray storage building.

Prior Approval South Cambridgeshire
20 Oct 2026 Awaiting decision 26/03963/HFUL

97 Highfields Road Highfields Caldecote Caldecote Cambridgeshire CB23 7NX

Raise roof to achieve 1st floor accommodation, external and internal alterations

Householder Works/Extension South Cambridgeshire
20 Oct 2026 Awaiting decision 26/03962/HFUL

26 Bird Farm Road Fulbourn Cambridgeshire CB21 5DP

Single storey rear extension

Householder Works/Extension South Cambridgeshire
20 Oct 2026 Awaiting decision 26/03843/LBC

Bwthyn Bach Church Lane Knapwell Cambridgeshire CB23 4NW

Demolition of modern outbuilding and replacement structure with glazed link. Alterations and refurbishment of cottage including: removal of cement ren...

Listed Building Consent South Cambridgeshire
20 Oct 2026 Awaiting decision 26/03842/HFUL

Bwthyn Bach Church Lane Knapwell Cambridgeshire CB23 4NW

Demolition of modern outbuilding and replacement structure with glazed link. Alterations and refurbishment of cottage including: removal of cement ren...

Householder Works/Extension South Cambridgeshire
20 Oct 2026 Awaiting decision 26/03883/HFUL

54 Orchard Road Histon Cambridgeshire CB24 9HN

Two storey front and side extension, single storey rear extension and rendering of existing property

Householder Works/Extension South Cambridgeshire
19 Oct 2026 Awaiting decision 26/03937/LBC

Manor Farm Main Street Caldecote Cambridgeshire CB23 7NU

Conversion and extension of existing agricultural buildings into a single residential unit

Listed Building Consent South Cambridgeshire
19 Oct 2026 Awaiting decision 26/03936/FUL

Manor Farm Main Street Caldecote Cambridgeshire CB23 7NU

Conversion and extension of existing agricultural buildings into a single residential unit

Full Application South Cambridgeshire
19 Oct 2026 Awaiting decision 26/03922/CL2PD

13 Glebe Field Willingham Cambridgeshire CB24 5AS

Certificate of lawfulness under S192 for a single storey rear extension to garage and Garage Conversion

Lawful Use Certificate (S192) South Cambridgeshire
16 Oct 2026 Awaiting decision 26/03915/HFUL

32 Whittlesford Road Little Shelford Cambridgeshire CB22 5EW

Removal of porch, construction of single storey rear infill extension, roof extension with rear dormer extension with,2No roof windows to front elevat...

Householder Works/Extension South Cambridgeshire
16 Oct 2026 Awaiting decision 26/03921/HFUL

34 Mill Lane Bassingbourn Cum Kneesworth Cambridgeshire SG8 5PP

Erection of a single-storey side and rear extension, replacement of existing windows, alterations to fenestration and demolition of existing shed.

Householder Works/Extension South Cambridgeshire
16 Oct 2026 Awaiting decision 26/03637/HFUL

3A Market Street Swavesey Cambridgeshire CB24 4QG

Erection of a Wooden garden building used as an office.

Householder Works/Extension South Cambridgeshire
16 Oct 2026 Awaiting decision 26/03857/CL2PD

1 Eland Way Teversham Cambridgeshire CB1 9XQ

Certificate of lawfulness under S192 to alter the existing fence and gate.

Lawful Use Certificate (S192) South Cambridgeshire
16 Oct 2026 Awaiting decision 26/03831/FUL

St Helena And St Marys Church High Street Bourn Cambridgeshire

Construction of 1no additional brick buttress to support the existing south boundary wall of the churchyard.

Full Application South Cambridgeshire
15 Oct 2026 Awaiting decision 26/03906/HFUL

9 The Oaks Milton Cambridgeshire CB24 6ZG

Erection of new fence

Householder Works/Extension South Cambridgeshire
15 Oct 2026 Awaiting decision 26/03801/LBC

Mill House Cambridge Road Fulbourn Cambridgeshire CB21 5EG

Replacement of the canvas of the shutters on the four sails of the windmill with aluminium sheet finished white

Listed Building Consent South Cambridgeshire
14 Oct 2026 Awaiting decision 26/03888/LBC

10 Chiswick End Meldreth Cambridgeshire SG8 6LZ

Conservation Repairs externally and internally. Demolition of two C20th additions and construction of a new rear single storey replacement. Replacemen...

Listed Building Consent South Cambridgeshire
14 Oct 2026 Awaiting decision 26/03887/HFUL

10 Chiswick End Meldreth Cambridgeshire SG8 6LZ

Conservation Repairs externally and internally. Demolition of two C20th additions and construction of a new rear single storey replacement. Replacemen...

Householder Works/Extension South Cambridgeshire
14 Oct 2026 Awaiting decision 26/03878/FUL

Nursery And Pre School Foxes Bridge Farm Royston Lane Comberton Cambridgeshire CB23 7EE

Retrospective installation of a building to accommodate additional farm-based childcare nursery space, including associated infrastructure and landsca...

Full Application South Cambridgeshire
14 Oct 2026 Awaiting decision 26/03782/HFUL

10 Flaxfields Linton Cambridgeshire CB21 4JG

Single storey front, rear and side extensions. Roof extension with rear dormer, balcony, cladding and associated landscaping works.

Householder Works/Extension South Cambridgeshire
14 Oct 2026 Awaiting decision 26/03829/HFUL

7 Overcote Road Over Cambridgeshire CB24 5NS

Single storey Annexe building to replace existing outbuilding.

Householder Works/Extension South Cambridgeshire
13 Oct 2026 Awaiting decision 26/03867/HFUL

117C High Street Harston Cambridgeshire CB22 7QB

Retrospective application for the retention of a detached, single-storey outbuilding within the front garden, forward of the principal elevation of th...

Householder Works/Extension South Cambridgeshire
13 Oct 2026 Awaiting decision 26/03858/CL2PD

65 Orchard Road Melbourn Cambridgeshire SG8 6BB

Certificate of lawfulness under S192 for a single storey replacement side extension.

Lawful Use Certificate (S192) South Cambridgeshire
12 Oct 2026 Awaiting decision 26/03851/LBC

13 Green Street Willingham Cambridgeshire CB24 5JA

Restoration and alterations to bring existing cottage back into habitable use.

Listed Building Consent South Cambridgeshire
12 Oct 2026 Awaiting decision 26/03709/S73

Greenaway 54 High Street Little Abington Cambridgeshire CB21 6BG

S73 to vary conditions 2 (approved plans) and 3 (materials) of ref: 26/02067/HFUL to include addition of a balcony, extension of the roof over the bal...

Section 73 - Remove/Vary Condition South Cambridgeshire
9 Oct 2026 Awaiting decision 26/03751/HFUL

The Sand Pit Potton Road Mill Hill Gamlingay Cambridgeshire SG19 3LW

Erection of a detached garage

Householder Works/Extension South Cambridgeshire
8 Oct 2026 Awaiting decision 26/03784/CL2PD

5 Green End Fen Ditton Cambridgeshire CB5 8SX

Certificate of lawfulness under S192 for replacement of existing external windows and doors.

Lawful Use Certificate (S192) South Cambridgeshire
8 Oct 2026 Awaiting decision 26/03699/LBC

Kings Barn High Street Horningsea Cambridgeshire CB25 9JG

Conversion and change of use of existing stables/barns and sheds to form 1no new 3 bedroom residential unit to south west with a new linking structure...

Listed Building Consent South Cambridgeshire
8 Oct 2026 Awaiting decision 26/03564/HFUL

Barkers Close School Lane Thriplow Cambridgeshire SG8 7RH

Demolition of the rear section of the existing dwelling following the erection of a two-storey side and rear extension, and a single-storey side exten...

Householder Works/Extension South Cambridgeshire
7 Oct 2026 Awaiting decision 26/03799/CL2PD

124 The Spinney Bar Hill Cambridgeshire CB23 8TW

Certificate of lawfulness under S192 for roof extension including rear dormer and 1no. rooflight to front.

Lawful Use Certificate (S192) South Cambridgeshire
7 Oct 2026 Awaiting decision 26/03798/HFUL

25 Bury Road Stapleford Cambridgeshire CB22 5BP

Single storey rear extension and single storey front extension with porch canopy.

Householder Works/Extension South Cambridgeshire
7 Oct 2026 Awaiting decision 26/03793/HFUL

34 Conybeare Road Barrington Cambridgeshire CB22 7AE

Erection of a garden room

Householder Works/Extension South Cambridgeshire
7 Oct 2026 Awaiting decision 26/03790/HFUL

6 St Margarets Road Girton Cambridgeshire CB3 0LT

Single storey rear extension following demolition of existing conservatory.

Householder Works/Extension South Cambridgeshire
7 Oct 2026 Awaiting decision 26/03788/HFUL

4 Paxton Close Cottenham Cambridgeshire CB24 8XP

Two storey front and single storey rear extension, including new windows to existing side elevations.

Householder Works/Extension South Cambridgeshire
6 Oct 2026 Awaiting decision 26/03276/LBC

16 Abbey Street Ickleton Cambridgeshire CB10 1SS

Replacement of ground and first floor windows.

Listed Building Consent South Cambridgeshire
6 Oct 2026 Awaiting decision 26/03783/FUL

Great Shelford Free Church Ashen Green Great Shelford Cambridgeshire CB22 5EY

Change of use of portion of rear garden (no 27) from C3 to F1(f), installation of doors and disabled access ramp to south-facing facade of Gt Shelford...

Full Application South Cambridgeshire
6 Oct 2026 Awaiting decision 26/03807/CL2PD

2 Ambrose Way Impington Cambridgeshire CB24 9US

Certificate of lawfulness under S192 for a single storey side extension, following demolition of existing conservatory.

Lawful Use Certificate (S192) South Cambridgeshire
6 Oct 2026 Awaiting decision 26/03768/HFUL

19 Church Street Haslingfield Cambridgeshire CB23 1JE

Relocation of the driveway and formation of a new vehicular access

Householder Works/Extension South Cambridgeshire
6 Oct 2026 Awaiting decision 26/03767/HFUL

37 Weavers Field Girton Cambridgeshire CB3 0XB

Erection of first-floor front extension over the existing ground floor and additional window at first floor level on west elevation

Householder Works/Extension South Cambridgeshire
5 Oct 2026 Awaiting decision 26/03759/HFUL

35A New Road Impington Cambridgeshire CB24 9LU

Two storey front and side extension and reduction of existing garage

Householder Works/Extension South Cambridgeshire
5 Oct 2026 Awaiting decision 26/03742/HFUL

74 Mill Lane Impington Cambridgeshire CB24 9HS

Single storey rear extension

Householder Works/Extension South Cambridgeshire
1 Oct 2026 Awaiting decision 26/03718/HFUL

1 Titch Street Cambridge Cambridgeshire CB5 8JN

Single storey rear mono pitch extension

Householder Works/Extension South Cambridgeshire
1 Oct 2026 Awaiting decision 26/03712/HFUL

46 Bannold Road Waterbeach Cambridgeshire CB25 9LQ

Single storey rear extension and garage conversion

Householder Works/Extension South Cambridgeshire
30 Sept 2026 Awaiting decision 26/03696/PRIOR

9 Ashwell Road Steeple Morden Cambridgeshire SG8 0NZ

Single storey rear extension.

Prior Approval South Cambridgeshire
30 Sept 2026 Awaiting decision 26/03697/HFUL

28 Giffords Way Over Cambridgeshire CB24 5UB

Single storey rear extension including conversion of garage to habitable space.

Householder Works/Extension South Cambridgeshire
29 Sept 2026 Awaiting decision 26/03688/HFUL

70A High Street Graveley Cambridgeshire PE19 6PL

Proposed first floor side extension including front dormer window and 3no. rooflights, and retrospective planning permission for the existing ground f...

Householder Works/Extension South Cambridgeshire
29 Sept 2026 Awaiting decision 26/03573/HFUL

49 Park Avenue Histon Cambridgeshire CB24 9JU

Demolition of existing conservatory and partial reduction in size of existing standalone garage. Erection of a two-storey rear and side extension

Householder Works/Extension South Cambridgeshire
29 Sept 2026 Awaiting decision 26/03694/HFUL

7 Mill Lane Toft Cambridgeshire CB23 2RW

Single storey rear extension, following demolition of the existing conservatory and single-storey element.

Householder Works/Extension South Cambridgeshire
29 Sept 2026 Awaiting decision 26/03488/HFUL

5 Church Close Whittlesford Cambridgeshire CB22 4NY

Single storey extension to rear and side and erection of new roof over to create first floor accommodation in the roofspace. Erection of front porch. ...

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

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