House extensions in Cambridge

Cambridge received 623 householder applications in the last 12 months - about 12 a week. Rear extensions and dormers are the most common. Of the 494 decided so far, 476 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 138 applications
22 Oct 2026 Awaiting decision 26/03910/HFUL

230 Hills Road Cambridge Cambridgeshire CB2 8QE

Single-storey rear extension, a single-storey infill extension to the existing courtyard, refurbishment and improvements to the existing three-storey ...

Householder Works/Extension Cambridge
22 Oct 2026 Awaiting decision 26/03913/LBC

12 And 13 Bene't Street And 2 And 2A Free School Lane Cambridge Cambridgeshire CB2 3PT

Like-for-like re-roofing of two roof slopes facing Benet Street, using reclaimed Welsh slate to match the existing roof covering.

Listed Building Consent Cambridge
21 Oct 2026 Awaiting decision 26/03961/FUL

Beaufort Place Thompsons Lane Cambridge Cambridgeshire CB5 8AG

Replacement of windows involving the replacement of single glazing with double glazing within existing timber frames, and the replacement of aluminium...

Full Application Cambridge
21 Oct 2026 Awaiting decision 26/03960/CL2PD

14 Herbert Street Cambridge Cambridgeshire CB4 1AQ

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

Lawful Use Certificate (S192) Cambridge
20 Oct 2026 Awaiting decision 26/03956/LBC

University Of Cambridge Library West Road Cambridge Cambridgeshire CB3 9DR

Works to 1970s library extension roof to replace existing waterproof membranes on flat roofs, installation of new guardrails and access systems and re...

Listed Building Consent Cambridge
20 Oct 2026 Awaiting decision 26/03861/HFUL

6 Selwyn Gardens Cambridge Cambridgeshire CB3 9AX

Replacement of existing conservatory with a glazed conservatory of similar form, erection of a detached outbuilding for use as a home gym, replacement...

Householder Works/Extension Cambridge
19 Oct 2026 Awaiting decision 26/03934/FUL

318 Mill Road Cambridge Cambridgeshire CB1 3NN

Retrospective retention of a single-storey rear extension to an existing six-bedroom House in Multiple Occupation (HMO).

Full Application Cambridge
19 Oct 2026 Awaiting decision 26/03924/HFUL

162 Thoday Street Cambridge Cambridgeshire CB1 3AX

Erection of a single storey rear and side extension and replacement of windows.

Householder Works/Extension Cambridge
19 Oct 2026 Awaiting decision 26/03841/HFUL

14 Christchurch Street Cambridge Cambridgeshire CB1 1HT

Retrospective new brick wall with metal railings and installation of a gate.

Householder Works/Extension Cambridge
19 Oct 2026 Awaiting decision 26/03275/LBC

1-2 Bridge Street Cambridge Cambridgeshire CB2 1UA

Refurbishment works include the construction of a new partition wall to form the proposed kitchen enclosure.

Listed Building Consent Cambridge
16 Oct 2026 Awaiting decision 26/03912/FUL

41-43 Long Road Cambridge Cambridgeshire CB2 8PP

Change of use of 41 Long Road to part Orthodontic Practice (Part of Ground Floor Only) and part 8-bedroom House in Multiple Occupation (HMO) following...

Full Application Cambridge
16 Oct 2026 Awaiting decision 26/03821/HFUL

316 Cherry Hinton Road Cambridge Cambridgeshire CB1 7AU

Proposed annexe replacing an existing single storey garage to create additional accommodation.

Householder Works/Extension Cambridge
15 Oct 2026 Awaiting decision 26/03610/CL2PD

91 Long Road Cambridge Cambridgeshire CB2 8HE

Certificate of lawfulness under S192 to replace existing wall with a 1.8m fence and 1m gate to front of existing dwelling.

Lawful Use Certificate (S192) Cambridge
15 Oct 2026 Awaiting decision 26/03911/LBC

14-18 George Iv Street And 20 And 22 Hills Road Cambridge Cambridgeshire CB2 1HH

Refurbishment, repair, partial demolition and alteration of Grade II Listed 20 and 22 Hills Road for residential use, including demolition and reconst...

Listed Building Consent Cambridge
15 Oct 2026 Awaiting decision 26/03897/LBC

The Round House 525 Newmarket Road Cambridge Cambridgeshire CB5 8LG

Erection of timber framed garden building following removal of existing garage.

Listed Building Consent Cambridge
15 Oct 2026 Awaiting decision 26/03896/HFUL

The Round House 525 Newmarket Road Cambridge Cambridgeshire CB5 8LG

Erection of timber framed garden building following removal of existing garage.

Householder Works/Extension Cambridge
15 Oct 2026 Awaiting decision 26/03895/HFUL

126 Malvern Road Cambridge Cambridgeshire CB1 9LH

Single storey flat roof infill extension with roof light to the front.

Householder Works/Extension Cambridge
15 Oct 2026 Awaiting decision 26/03810/FUL

54 Devonshire Road Cambridge Cambridgeshire CB1 2BL

Part two storey and part single storey rear extension. Roof extension with rear dormers and 2 skylights to the front elevation. Erection of bin store ...

Full Application Cambridge
14 Oct 2026 Awaiting decision 26/03881/HFUL

5 Montreal Road Cambridge Cambridgeshire CB1 3NP

Single storey rear extension, part first & second storey rear extension, plus pitched roof over existingflat roof

Householder Works/Extension Cambridge
14 Oct 2026 Awaiting decision 26/03885/CL2PD

61 Victoria Road Cambridge Cambridgeshire CB4 3BW

Certificate of lawfulness under S192 for a proposed outbuilding to the rear for ancillary use.

Lawful Use Certificate (S192) Cambridge
14 Oct 2026 Awaiting decision 26/03797/HFUL

17 Perne Avenue Cambridge Cambridgeshire CB1 3RY

Single storey side and rear extension.

Householder Works/Extension Cambridge
14 Oct 2026 Awaiting decision 26/03770/HFUL

123 Oxford Road Cambridge Cambridgeshire CB4 3PJ

Single storey side infill and rear extension, replacement of the existing first-floor outrigger roof with a dual-pitched roof and rear loft dormer. Ro...

Householder Works/Extension Cambridge
13 Oct 2026 Awaiting decision 26/03597/HFUL

78 Queen Ediths Way Cambridge Cambridgeshire CB1 8PW

Retrospective conversion and extension to the garage for an ancillary annexe associated with the main dwelling.

Householder Works/Extension Cambridge
12 Oct 2026 Awaiting decision 26/03771/HFUL

6 Stanesfield Close Cambridge Cambridgeshire CB5 8NJ

Single storey front (part) and rear extensions, removal of chimney, internal reconfigurations to the ground and first floors and erection of an outbui...

Cambridge
7 Oct 2026 Awaiting decision 26/03804/CL2PD

171 Foster Road Cambridge Cambridgeshire CB2 9JW

Certificate of lawfulness under S192 for roof extension with rear dormer and 3no. rooflights to front.

Lawful Use Certificate (S192) Cambridge
7 Oct 2026 Awaiting decision 26/03792/HFUL

93 Akeman Street Cambridge Cambridgeshire CB4 3HE

Retrospective first floor rear/side lean to roof extension

Householder Works/Extension Cambridge
5 Oct 2026 Awaiting decision 26/03758/HFUL

129 Histon Road Cambridge Cambridgeshire CB4 3JD

Two storey side/front extension and single story rear extension with sedum roof. Roof extension with rear dormer, new gable roof to front. Alterations...

Householder Works/Extension Cambridge
5 Oct 2026 Awaiting decision 26/03781/HFUL

145 Vinery Road Cambridge Cambridgeshire CB1 3DW

Hip to gable roof alteration including increased roof height to provide additional accommodation. Single storey front extension. Construction of new p...

Householder Works/Extension Cambridge
2 Oct 2026 Awaiting decision 26/03729/FUL

27-28 Bridge Street Cambridge Cambridgeshire CB2 1UJ

Installation of new shopfront and seating at the rear external court yard with proposed conservatory glass roof.

Full Application Cambridge
2 Oct 2026 Awaiting decision 26/03579/LBC

Trinity College Trinity Street Cambridge Cambridgeshire CB2 1TQ

Installation of secondary glazing to the Fellows Set B2, located within Great Court at Trinity College, Cambridge.

Listed Building Consent Cambridge
1 Oct 2026 Awaiting decision 26/03721/CL2PD

23 Wulfstan Way Cambridge Cambridgeshire CB1 8QL

Certificate of lawfulness under S192 for erection of outbuilding to rear.

Lawful Use Certificate (S192) Cambridge
1 Oct 2026 Awaiting decision 26/03687/HFUL

106 Oxford Road Cambridge Cambridgeshire CB4 3PL

Single storey rear extension and erection of outbuilding in rear garden.

Householder Works/Extension Cambridge
1 Oct 2026 Withdrawn 26 Oct 25/02952/NMA1

94A Mill Road Cambridge Cambridgeshire CB1 2BD

Non-material amendment on application 25/02952/FUL for change of windows to the upper floors of the front elevation (NE) from timber to heritage style...

Non-Material Amendment Cambridge
30 Sept 2026 Awaiting decision 26/03540/FUL

Brooklands Court Brooklands Avenue Cambridge Cambridgeshire CB2 8BP

Replacement of existing timber windows and patio doors to UPVC in chartwell green. The external balconies will be painted to match.

Full Application Cambridge
28 Sept 2026 Awaiting decision 26/03662/HFUL

28 Harding Way Cambridge Cambridgeshire CB4 3RR

Erection of detached outbuilding for ancillary use following demolition of existing conservatory

Householder Works/Extension Cambridge
28 Sept 2026 Awaiting decision 26/03654/FUL

Blackfriars Buckingham Road Cambridge Cambridgeshire CB3 0DD

Removal of existing paving, laying of new permeable paving, alterations to ramped access for wheelchair users, alterations to porch roof.

Full Application Cambridge
24 Sept 2026 Awaiting decision 26/03608/LBC

2 Rose Crescent Cambridge Cambridgeshire CB2 3LL

Roof repairs and masonry brickwork reconstruction to the front elevation at high level.

Listed Building Consent Cambridge
24 Sept 2026 Awaiting decision 26/03638/CL2PD

13 Stanesfield Road Cambridge Cambridgeshire CB5 8NH

Certificate of lawfulness under S192 for erection of detached single storey outbuilding to rear garden.

Lawful Use Certificate (S192) Cambridge
24 Sept 2026 Awaiting decision 26/03640/FUL

The Oak Building Kingfisher Way Cambridge Cambridgeshire CB2 8DA

Replacement of timber cladding.

Full Application Cambridge
23 Sept 2026 Awaiting decision 26/03634/HFUL

58 Long Reach Road Cambridge Cambridgeshire CB4 1UJ

Demolition of existing garage. First floor rear extension.

Householder Works/Extension Cambridge
23 Sept 2026 Awaiting decision 26/03589/FUL

Gonville Hotel Gonville Place Cambridge Cambridgeshire CB1 1LY

Single storey front extension to accommodate function/conference pavilion

Full Application Cambridge
23 Sept 2026 Awaiting decision 26/03598/HFUL

24 Lovell Road Cambridge Cambridgeshire CB4 2QR

Roof alterations to create hip to gable with roof lights on the front elevation, rear loft extension to create flat roof loft room and pitched and gab...

Householder Works/Extension Cambridge
23 Sept 2026 Awaiting decision 26/03627/CL2PD

336 Cherry Hinton Road Cambridge Cambridgeshire CB1 8AZ

Loft conversion, rear dormer, resize of the side window, No2 front roof windows.

Lawful Use Certificate (S192) Cambridge
23 Sept 2026 Awaiting decision 26/03623/HFUL

12 Lauriston Place Cambridge Cambridgeshire CB4 2UP

Erection of a single storey front extension to create a Granny Annexe for ancillary use.

Householder Works/Extension Cambridge
22 Sept 2026 Awaiting decision 26/03426/HFUL

12 Alpha Road Cambridge Cambridgeshire CB4 3DG

Single storey side and rear extensions. Rooflights to rear roof. Installation of Air Source Heat Pump and PV Solar Panels.

Householder Works/Extension Cambridge
22 Sept 2026 Awaiting decision 26/03489/LBC

1-5 Scroope Terrace, Department Of Arch And History Of Art Trumpington Street Cambridge Cambridgeshire CB2 1PX

Installation of 4no. gutter overflow outlets.

Listed Building Consent Cambridge
22 Sept 2026 Awaiting decision 26/03497/HFUL

44 Shelford Road Cambridge Cambridgeshire CB2 9NA

Detached single storey outbuilding to rear of the dwelling

Householder Works/Extension Cambridge
21 Sept 2026 Awaiting decision 26/03595/HFUL

526B Coldhams Lane Cambridge Cambridgeshire CB1 3JL

Annexe ancillary to the main dwelling

Householder Works/Extension Cambridge
21 Sept 2026 Awaiting decision 26/03592/HFUL

55 Argyle Street Cambridge Cambridgeshire CB1 3LS

Roof extension with rear dormer, 2No rooflights for front elevation, single storey side and rear extension.

Householder Works/Extension Cambridge
21 Sept 2026 Approved 23 Oct 26/03591/HFUL

30 Highfield Avenue Cambridge Cambridgeshire CB4 2AL

Single storey front extension

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

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