House extensions in Chelmsford

Chelmsford received 910 householder applications in the last 12 months - about 18 a week. Rear extensions and garage works are the most common. Of the 761 decided so far, 663 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 202 applications
21 Oct 2026 Pending Consideration 26/00035/HHPA

41 Sixth Avenue Chelmsford Essex CM1 4ED

Proposed single storey rear extension to the dwellinghouse, extending 5.8 metres beyond the rear wall of the original dwellinghouse, with a mono-pitch...

Chelmsford
20 Oct 2026 Pending Consideration 26/01221/FUL

9 Butterfield Road Boreham Chelmsford Essex CM3 3BP

Single storey rear extension.

Chelmsford
19 Oct 2026 Pending Consideration 26/01418/FUL

7 Edward Drive Chelmsford Essex CM2 9ER

Single storey side extension and loft conversion with rear dormer, front facing roof light and second floor side window.

Chelmsford
16 Oct 2026 Pending Consideration 26/01413/FUL

4 Copland Close Great Baddow Chelmsford Essex CM2 7NY

Single storey rear extension.

Chelmsford
16 Oct 2026 Pending Consideration 26/01404/CLOPUD

84 Millfields Writtle Chelmsford Essex CM1 3LW

Proposed single storey rear extension

Chelmsford
16 Oct 2026 Pending Consideration 26/01369/FUL

Step Start Chelmsford Station House 27 - 30 Railway Street Chelmsford CM1 1QS

Retrospective application for the change of use of rear service and parking area to an enclosed outdoor play and learning area ancillary to the ground...

Chelmsford
16 Oct 2026 Pending Consideration 26/01366/FUL

Great Barn House School Lane Great Leighs Chelmsford Essex CM3 1PD

Proposed extensions and internal alterations

Chelmsford
15 Oct 2026 Pending Consideration 26/01403/FUL

47 Galleywood Road Great Baddow Chelmsford Essex CM2 8DJ

Single storey rear extension and external alterations.

Chelmsford
15 Oct 2026 Pending Consideration 26/01320/FUL

Our Lady Immaculate Roman Catholic Primary School 120 New London Road Chelmsford CM2 0RG

Retrospective application for the installation of weldmesh fencing, and close-boarded timber fencing

Chelmsford
15 Oct 2026 Pending Consideration 26/01316/FUL

Manor Farm Gay Bowers Road Danbury Chelmsford Essex CM3 4JQ

Proposed demolition of existing outbuilding and construction of new outbuilding and annex. New link between outbuilding and existing dwelling.

Chelmsford
14 Oct 2026 Pending Consideration 26/01350/FUL

34 Egbert Gardens Runwell Wickford Essex SS11 7BH

Proposed infill windows between existing dormers

Chelmsford
14 Oct 2026 Pending Consideration 26/01400/FUL

Good Graces Graces Lane Little Baddow Chelmsford Essex CM3 4AX

Proposed single storey front extension and single storey rear extension.

Chelmsford
14 Oct 2026 Pending Consideration 26/01396/CLOPUD

4 Howard Drive Chelmer Village Chelmsford Essex CM2 6PE

Conversion of the existing double garage into habitable accommodation.

Chelmsford
14 Oct 2026 Pending Consideration 26/01328/CLOPUD

31 Greenways Chelmsford Essex CM1 4EF

Loft conversion with rear and side dormer, rear juliet balcony, second floor side window and two front facing roof lights.

Chelmsford
13 Oct 2026 Pending Consideration 26/01354/FUL

83 South Primrose Hill Chelmsford Essex CM1 2RF

Demolition of existing garage. Single storey rear extension and construction of an outbuilding and carport.

Chelmsford
13 Oct 2026 Pending Consideration 26/01391/FUL

1 Meadowcroft Woodham Road Rettendon Wickford Essex SS11 7QU

Proposed single storey rear extension.

Chelmsford
13 Oct 2026 Pending Decision 26/01360/CLOPUD

67 North Avenue Chelmsford Essex CM1 2AN

Single storey rear extension and single storey side extension.

Chelmsford
13 Oct 2026 Pending Consideration 26/01301/FUL

Greenacre Hyde Lane Danbury Chelmsford Essex CM3 4LW

Part single, part two storey rear extension.

Chelmsford
12 Oct 2026 Pending Consideration 26/01387/FUL

Little Waltham Church Of England Primary School The Street Little Waltham Chelmsford Essex CM3 3NY

Proposed replacement roof and windows and doors to IT Suite.

Chelmsford
12 Oct 2026 Pending Consideration 26/01388/FUL

22 Brook Lane Galleywood Chelmsford CM2 8NL

Part demolition of existing ground floor extension. Replacement single storey extension.

Chelmsford
12 Oct 2026 Pending Consideration 26/01384/FUL

6 Gunson Gate Chelmsford Essex CM2 9NZ

Proposed single story rear extension, changes to front entrance including new canopy over door

Chelmsford
9 Oct 2026 Pending Consideration 26/01383/FUL

9 Pot Inn Close Runwell Wickford SS11 7FZ

Proposed single storey rear extension with roof lights, loft conversion to create two bedrooms with dormers front and back, dormer extension above the...

Chelmsford
9 Oct 2026 Pending Consideration 26/01311/CLOPUD

8 Goldlay Gardens Chelmsford Essex CM2 0EN

Loft conversion with rear dormer

Chelmsford
9 Oct 2026 Pending Consideration 26/01310/FUL

8 Goldlay Gardens Chelmsford Essex CM2 0EN

First floor rear extension, change of existing pitched roof to flat roof with new roof latern to existing ground floor rear extension, new bi fold doo...

Chelmsford
9 Oct 2026 Pending Consideration 26/01324/FUL

Longfield Barn The Tye Margaretting Ingatestone Essex CM4 9JX

Demolition of existing Barn 3 and erection of a replacement outbuilding for private gym, workshop, stables and household storage use ancillary to the ...

Chelmsford
8 Oct 2026 Pending Consideration 26/01371/FUL

23 Mount Pleasant Road South Woodham Ferrers Chelmsford Essex CM3 5PA

Part two storey, part first floor side and rear extension. Loft conversion with hip to gable extension, five front dormers, a rear dormer and rear bal...

Chelmsford
7 Oct 2026 Pending Consideration 26/01370/FUL

6 Cherry Garden Road Great Waltham Chelmsford Essex CM3 1DJ

Single-storey rear extension.

Chelmsford
7 Oct 2026 Pending Consideration 26/01363/FUL

141 Beeches Road Chelmsford CM1 2SA

First floor rear extension

Chelmsford
7 Oct 2026 Pending Consideration 26/01325/FUL

Land To The North West Of Imbirds Yard Souther Cross Road Good Easter Chelmsford Essex

Conversion of barn to a single dwelling including extensions and alterations, associated parking, landscaping and ancillary works, and demolition of e...

Chelmsford
7 Oct 2026 Pending Consideration 26/00034/HHPA

373 Meadgate Avenue Great Baddow Chelmsford Essex CM2 7NN

The construction of a single storey rear extension, which would extend beyond the rear wall of the original house by a maximum depth of 6m, for which ...

Chelmsford
6 Oct 2026 Pending Consideration 26/01358/FUL

6 Homestead Broomfield Chelmsford Essex CM1 7WT

Proposed first floor front extension and side windows

Chelmsford
6 Oct 2026 Pending Consideration 26/01361/FUL

Gay Bowers Farm Bakers Lane West Hanningfield Chelmsford Essex CM2 8LD

Conversion of the existing detached garage to ancillary residential accommodation, construction of a single storey link to the dwelling and associated...

Chelmsford
6 Oct 2026 Pending Consideration 26/01286/CLOPUD

Wych Elm Mashbury Road Chignal St James Chelmsford Essex CM1 4TZ

Single storey rear extension.

Chelmsford
6 Oct 2026 Pending Consideration 26/01272/FUL

Field 4987 De Beauvoir Chase Downham Billericay Essex

Retrospective application for a compacted stone access track and small stone parking area, a single-story timber storage shed and the construction of ...

Chelmsford
5 Oct 2026 Pending Consideration 26/01352/FUL

1 New England Close Bicknacre Chelmsford CM3 4XA

Proposed single storey front extension and roof replacement with conversion of garage into habitable space. Proposal also to extend dropped kerb at fr...

Chelmsford
5 Oct 2026 Pending Consideration 26/01351/FUL

14 Galleywood Road Great Baddow Chelmsford Essex CM2 8DH

Retrospective application for the Construction of single storey loggia (covered walkway) to rear gable wall between house and outbuilding & erection o...

Chelmsford
5 Oct 2026 Pending Consideration 26/01299/CLOPUD

Riddens Croft West Hanningfield Road West Hanningfield Chelmsford CM2 7SY

Proposed single storey side extension

Chelmsford
2 Oct 2026 Pending Consideration 26/01345/FUL

Chelmer Village Hall Village Square Chelmer Village Chelmsford CM2 6RF

New external access bridge and staircase, with internal alterations and a platform stairlift for disabled access

Chelmsford
2 Oct 2026 Pending Consideration 26/01346/FUL

58 Waterson Vale Chelmsford Essex CM2 9PB

Single storey rear extension

Chelmsford
2 Oct 2026 Pending Consideration 26/01344/FUL

74 Foxglove Avenue Chelmsford CM1 4FW

Proposed single storey rear extension

Chelmsford
1 Oct 2026 Pending Consideration 26/01337/FUL

Annexe Siljan Whites Hill Stock Ingatestone Essex

Proposed extensions and alterations to existing annexe

Chelmsford
1 Oct 2026 Pending Consideration 26/01218/FUL

33 Moortown Place Chelmsford Garden Community Chelmsford CM3 3FZ

Proposed garage conversion to habitable space.

Chelmsford
1 Oct 2026 Pending Consideration 26/01247/FUL

23 Baddow Hall Crescent Great Baddow Chelmsford CM2 7BY

Single storey rear extension and alterations to fenestration.

Chelmsford
30 Sept 2026 Pending Consideration 26/01329/FUL

Spring Cottage 47 School Road Downham Billericay Essex CM11 1QP

Part single storey, part two storey rear extension. Demolish existing garage and construct replacement outbuilding. Alterations to fenestration.

Chelmsford
29 Sept 2026 Pending Consideration 26/00955/FUL

50 Hillary Close Chelmsford Essex CM1 7RP

Proposed vehicular crossover

Chelmsford
28 Sept 2026 Pending Consideration 26/01323/FUL

195A Hullbridge Road South Woodham Ferrers Chelmsford CM3 5LW

Proposed single storey rear extension and garage loft conversion with two new dormers and external staircase. External alterations.

Chelmsford
28 Sept 2026 Pending Consideration 26/01321/FUL

35 Donald Way Chelmsford Essex CM2 9JD

First floor side extension.

Chelmsford
28 Sept 2026 Pending Consideration 26/00033/HHPA

53 Harold Gardens Runwell Wickford Essex SS11 7EP

The construction of a single storey rear extension, which would extend beyond the rear wall of the original house by a maximum depth of 6m, for which ...

Chelmsford
28 Sept 2026 Pending Consideration 26/00032/HHPA

6 Longstomps Avenue Chelmsford Essex CM2 9LA

The construction of a single storey rear extension, which would extend beyond the rear wall of the original house by a maximum depth of 8m, for which ...

Chelmsford
25 Sept 2026 Pending Consideration 26/01314/FUL

Hollow Farm 54 Heath Road Ramsden Heath Billericay Essex CM11 1HS

Change of use of barn to leisure/gym facility (Class E(d)) with single storey extension to north with associated external alterations and car parking.

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

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