House extensions in Colchester

Colchester received 629 householder applications in the last 12 months - about 12 a week. Rear extensions and side extensions are the most common. Of the 492 decided so far, 414 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 153 applications
22 Oct 2026 Application Valid 261868

1 Beaumont Close, Colchester CO4 5XE

ground floor extension to rear of house and convert and extend existing garage to create annexe for family membe

Full (8 Week Determination) Colchester
22 Oct 2026 Application Valid 261871

11a King Harold Road, Colchester CO3 4SB

Proposed single storey rear extension, garage conversions, front porch, relocation of existing conservatory and proposed brick built shed.

Full (8 Week Determination) Colchester
21 Oct 2026 Application Valid 261876

375 Ipswich Road, Colchester CO4 0HL

Application for a Lawful Development Certificate for proposed single storey rear extension

Certificate of Lawful Use - Proposed Colchester
21 Oct 2026 Application Valid 261878

155 Straight Road, Colchester CO3 9DF

Demolition of existing outbuildings. Ground floor rear and side extension with part first floor rear extension. Remodelling of front elevation to repl...

Full (8 Week Determination) Colchester
21 Oct 2026 Application Valid 261518

32 Deben Road, Colchester CO4 3UZ

Erection of Double storey side extension and change of facade fenestration incorporating glazed balcony and timber cladding

Full (8 Week Determination) Colchester
20 Oct 2026 Application Valid 261872

Somerson House, New Road, Aldham Colchester CO6 3PN

New outbuilding incidental to the enjoyment of the dwellinghouse at Somerson House

Full (8 Week Determination) Colchester
20 Oct 2026 Application Valid 261826

Pippins, Green Lane, Aldham Colchester CO6 3PR

Extensions to dwelling, following partial removal of existing rear extension, and loft conversion.

Full (8 Week Determination) Colchester
20 Oct 2026 Application Valid 261775

138 St Andrews Avenue, Colchester CO4 3AQ

Demolition of existing out-buildings, proposed side/rear extension andchange of use of the existing four-bedroom dwelling to provide a three-bedroom a...

Full (8 Week Determination) Colchester
19 Oct 2026 Application Valid 261863

Tronoh House, Church Road, Peldon Colchester CO5 7PS

Retrospective application for Erection of a vehicular gate, brick piers and close-boarded timber fence of maximum 1.9m height to secure an existing dr...

Full (8 Week Determination) Colchester
19 Oct 2026 Application Valid 261856

St Mary the Virgin Church, New Church Road, West Bergholt Colchester CO6 3JF

Demolition of existing temporary structure and replacement with new extension.

Full (8 Week Determination) Colchester
19 Oct 2026 Application Valid 261752

Shelley Glebe Barn, Grove Hill, Dedham Colchester CO7 6DT

Retrospective application for the retention of an existing timber shelter measuring approximately 4m + 4m and its associated timber deckmeasuring appr...

Full (8 Week Determination) Colchester
19 Oct 2026 Application Valid 261671

7 Duffield Drive, Colchester CO4 3YQ

Installation of french door to rear elevation to access private rear amenity area.

Full (8 Week Determination) Colchester
19 Oct 2026 Application Valid 261784

153 Turner Road, Colchester CO4 5XW

Application for a lawful development certificate for a proposed vehicle access and hard standing

Certificate of Lawful Use - Proposed Colchester
16 Oct 2026 Application Valid 261730

44 Forest Road, Colchester CO4 3RL

Installation of external wall insulation system with decorative render

Full (8 Week Determination) Colchester
15 Oct 2026 Application Valid 261634

11 Millers Lane, Stanway Colchester CO3 0PS

Proposed single-storey to the existing attached side garage, extendingthe garage 3 metres towards the front of the property, with the extension remain...

Certificate of Lawful Use - Proposed Colchester
14 Oct 2026 Application Valid 261850

22 Groves Close, Colchester CO4 5BP

Erection of a single-storey garden room for purposes incidental to theenjoyment of the host dwelling, following the recent demolition of theexisting o...

Full (8 Week Determination) Colchester
14 Oct 2026 Application Valid 261835

Unit 4a, Tollgate Centre, Tollgate West, Stanway Colchester

Installation of a mezzanine floor for back of house purposes.

Full (8 Week Determination) Colchester
14 Oct 2026 Application Valid 261842

Harris Barn, Kemps Farm, Mersea Road, Peldon Colchester CO5 7QG

Retrospective application for Retention of existing detached garage/cart lodge with ancillary first-floor accommodation associated with Harris Barn, a...

Full (8 Week Determination) Colchester
14 Oct 2026 Application Valid 261836

Premier Inn Restaurant, Cowdray Avenue, Colchester

External alterations including car park extension and reconfiguration,new single-storey WC extension, service yard improvements, external lighting, re...

Full (8 Week Determination) Colchester
14 Oct 2026 Application Valid 261801

Flat 10, The Truman, Maltings Park Road, West Bergholt Colchester CO6 3TJ

Replacement of the existing single glazing, identified as non- historic, with LandVac UltraClear vacuum-insulated glazing.

Full (8 Week Determination) Colchester
14 Oct 2026 Application Valid 261832

Bromley House, Kelvedon Road, Tiptree Colchester CO5 0LJ

Proposed summer house

Full (8 Week Determination) Colchester
13 Oct 2026 Application Valid 261834

1 Crown Cottages, Nayland Road, Great Horkesley Colchester CO6 4AH

Demolition of the existing conservatory and single-storey to rear, followed by the construction of a part two-storey, part single-storey rear extensio...

Full (8 Week Determination) Colchester
12 Oct 2026 Application Valid 261825

49 Ambrose Avenue, Colchester CO3 4LJ

Demolition of existing garage and replacement with two storey side extension.

Full (8 Week Determination) Colchester
12 Oct 2026 Application Valid 261817

The Conifers, Boxted Church Road, Great Horkesley Colchester CO6 4AL

Proposed single storey extension to form an Annex and insertion of additional roof lights.

Full (8 Week Determination) Colchester
12 Oct 2026 Application Valid 261816

9 London Land Cottages, Church Road, Wormingford Colchester CO6 3AE

Erection of a single storey rear extension, first floor side extensionand loft conversion with associated rear facing dormer, to provide additional li...

Full (8 Week Determination) Colchester
12 Oct 2026 Application Valid 261793

7 Partridge Drive, Fordham Colchester CO6 3NH

Construction of ground/first floor side extension to replace existing garage

Full (8 Week Determination) Colchester
9 Oct 2026 Application Valid 261815

44 Causton Road, Colchester CO1 1RT

Application for a Lawful Development Certificate for a Proposed Solar panels to front elevation & Loft Conversion, including rear facing dormer

Certificate of Lawful Use - Proposed Colchester
8 Oct 2026 Application Valid 261806

32 Lansdowne Close, Tiptree Colchester CO5 0NT

Replace fence to rear boundary

Full (8 Week Determination) Colchester
8 Oct 2026 Application Valid 261807

30 Empress Avenue, West Mersea Colchester CO5 8EX

Proposed open sided carport

Full (8 Week Determination) Colchester
7 Oct 2026 Application Valid 261803

Rainbow Cottage, The Street, Chappel Colchester CO6 2DD

Reinstatement of a front wall and gate and an extension to the driveway length.

Full (8 Week Determination) Colchester
7 Oct 2026 Application Valid 261627

20 St Clare Road, Colchester CO3 3SZ

Single storey extension to existing detached outbuilding to provide residential annexe accommodation ancillary to the main dwelling.

Full (8 Week Determination) Colchester
7 Oct 2026 Application Valid 261717

15 Tower Road, Wivenhoe Colchester CO7 9QE

Conversion of existing workshop to annex ancillary to the main dwelling

Full (8 Week Determination) Colchester
6 Oct 2026 Application Valid 261794

5 Station Road, Tiptree Colchester CO5 0AJ

Two storey rear and side extensions to existing cottage to provide expanded living and bedroom space

Full (8 Week Determination) Colchester
6 Oct 2026 Application Valid 261751

80 St Johns Road, Colchester CO4 0JL

Single storey front / rear extension

Full (8 Week Determination) Colchester
5 Oct 2026 Application Valid 261785

Green Farm House, Copford Green, Copford Colchester CO6 1BZ

Demolition of the existing dilapidated outbuildings and construction of a new single-storey extension to the north of the dwelling, together with the ...

Full (8 Week Determination) Colchester
2 Oct 2026 Application Valid 261780

45 Septimus Drive, Colchester CO4 9EU

Single storey rear extension.

Full (8 Week Determination) Colchester
2 Oct 2026 Application Valid 261757

54 Layer Road, Colchester CO2 7JH

Single storey side extension

Full (8 Week Determination) Colchester
2 Oct 2026 Application Valid 261753

Fairways, East Road, East Mersea Colchester CO5 8UW

Removal of existing window and patio doors and replacing these with new large bi-fold doors, converting flat roof over existing rear extenion to form ...

Full (8 Week Determination) Colchester
1 Oct 2026 Application Valid 261769

100 Oak Road, Tiptree Colchester CO5 0NA

Front, side and rear extension with creation of new first floor over.

Full (8 Week Determination) Colchester
30 Sept 2026 Application Valid 261762

The Fields, 61 Barbrook Lane, Tiptree Colchester CO5 0EF

Single storey rear extension and first floor extension, replacement garden wall

Full (8 Week Determination) Colchester
30 Sept 2026 Application Valid 261763

Community Centre, 1a Caxton Close, Tiptree Colchester CO5 0HA

Application for a Lawful Development Certificate for a proposed improvement and accessibility with safe access for wheelchair users and people with re...

Certificate of Lawful Use - Proposed Colchester
30 Sept 2026 Application Valid 261766

86 Maldon Road, Tiptree Colchester CO5 0BW

Proposed single storey rear addition

Full (8 Week Determination) Colchester
30 Sept 2026 Application Valid 261744

13 Green Lane, Tiptree Colchester CO5 0DA

Front and rear extension with a double garage

Full (8 Week Determination) Colchester
29 Sept 2026 Application Valid 261735

Vine House, Cooks Hill, Boxted Colchester CO4 5SS

Installation of pool, replacement gates and associated landscaping. New light fitting fixed to house.

Full (8 Week Determination) Colchester
29 Sept 2026 Application Valid 261759

Braiswick Farm, Braiswick Lane, Colchester CO4 5ED

Removal of non-original fireplace brickwork and timber lintel. Replacement of damaged timber lintel. Part removal of repaired internal masonry wall an...

Listed Building Colchester
29 Sept 2026 Application Valid 261756

Clifton House, Chapel Road, Wivenhoe Colchester CO7 9DX

Alterations to chimney, re-roofing of existing side studio, replacement of conservatory with garden extension, with small veranda roof linking the two...

Full (8 Week Determination) Colchester
28 Sept 2026 Application Valid 261750

Tanglewood, 37 Church Lane, Colchester CO3 4DX

Re-submission of application 260373 following dismissed appeal Ref. 6009741, with amendments to the first-floor dormer proposals.

Full (8 Week Determination) Colchester
28 Sept 2026 Application Valid 261604

15 Deben Road, Colchester CO4 3UZ

Erection of a single storey part-rear and part-side extension, infill front extension with associated internal alterations, and extension tothe part e...

Full (8 Week Determination) Colchester
24 Sept 2026 Application Valid 261743

6 Brook Cottages, Wet Lane, Boxted Colchester CO4 5TW

Erection of a part first-floor rear extension, with alterations to theexisting first-floor layout and changes to rear fenestration.

Full (8 Week Determination) Colchester
24 Sept 2026 Application Valid 261740

49 Lexden Road, Colchester CO3 3PY

Erection of an aluminium panel sided glasshouse on a concrete ring beam base

Full (8 Week Determination) Colchester
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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 Colchester?
Yes. Click "Set up alerts" on this page and you'll get a daily or weekly email listing every new extensions application published by Colchester. You can also narrow the alert to a postcode, street, or drawn area.

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