House extensions in Dacorum

Dacorum received 856 householder applications in the last 12 months - about 16 a week. Rear extensions and side extensions are the most common. Of the 699 decided so far, 630 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 197 applications
Yesterday With planning case officer 26/02216/FHA

1 Albion Mews Belswains Lane Hemel Hempstead Hertfordshire HP3 9PP

Conversion of roof space into habitable room with proposed rear flat roof dormer

Full Householder Application Dacorum
Yesterday With planning case officer 26/02277/LDP

8 Perry Green Hemel Hempstead Hertfordshire HP2 7NB

Conversion of existing vehicular garage to bedroom with en-suite. Replacing the garage door with window and matching brickwork. Installing floor insul...

Lawful Development Certificate Proposed Dacorum
23 Oct 2026 With planning case officer 26/02338/LDP

Daymar London Road Hemel Hempstead Hertfordshire HP1 2RE

Construction of outbuilding for pool and home office

Lawful Development Certificate Proposed Dacorum
23 Oct 2026 With planning case officer 26/02340/FHA

27 Longdean Park Hemel Hempstead Hertfordshire HP3 8BZ

Internal alterations, installation of a new rear opening, changes to the front elevation which includes removal of bay window from the first floor, re...

Full Householder Application Dacorum
23 Oct 2026 With planning case officer 26/02341/FHA

34 Sheldon Way Berkhamsted Hertfordshire HP4 1FH

Realignment of garden boundary wall

Full Householder Application Dacorum
23 Oct 2026 With planning case officer 26/02339/FHA

36 Belham Road Kings Langley Hertfordshire WD4 8BY

Single storey side extension, roof alterations to side elevation, extension of chimney, insertion of roof lights, alterations to rear steps and openin...

Full Householder Application Dacorum
23 Oct 2026 With planning case officer 26/02336/FHA

Daymar London Road Hemel Hempstead Hertfordshire HP1 2RE

Loft conversion with front and rear dormers

Dacorum
23 Oct 2026 With planning case officer 26/02334/FUL

52 Queensway Hemel Hempstead Hertfordshire HP2 5HA

Part single-storey, part two-storey rear extension to allow for a larger flat on the first floor.

Full Planning Permission Dacorum
23 Oct 2026 With planning case officer 26/02333/FHA

57 Dunston Hill Tring Hertfordshire HP23 4AT

Proposed single storey wrap around extension

Full Householder Application Dacorum
23 Oct 2026 With planning case officer 26/02324/HPA

246 Northridge Way Hemel Hempstead Hertfordshire HP1 2AS

Single storey rear extension measuring 5.00m deep with a maxim ridge height of 3.60 m and maximum eaves height of 2.58m

Householder Prior Approval Dacorum
23 Oct 2026 With planning case officer 26/02320/FHA

24 Colne Way Hemel Hempstead Hertfordshire HP2 6EA

Front extension.

Full Householder Application Dacorum
22 Oct 2026 With planning case officer 26/02325/FHA

158 St Johns Road Hemel Hempstead Hertfordshire HP1 1NR

Ground floor rear extension, new raised roof, facade and internal redesign and all associated works

Full Householder Application Dacorum
22 Oct 2026 With planning case officer 26/02314/FHA

26A North Road Berkhamsted Hertfordshire HP4 3DU

Two storey extension to the front. Demolition of the existing garage to the front. New cladding and gable to the rear. New entranceway is formed at gr...

Full Householder Application Dacorum
22 Oct 2026 With planning case officer 26/02306/FHA

34 Trooper Road Aldbury Hertfordshire HP23 5RW

First floor rear extension and alterations to openings, including new side and rear facing first floor windows

Full Householder Application Dacorum
22 Oct 2026 Awaiting final decision 26/02305/FHA

Limber Dudswell Lane Dudswell Hertfordshire HP4 3TQ

The construction of a single-storey contemporary garden building to provide a dedicated additional games room/ cinema room for the family.

Full Householder Application Dacorum
22 Oct 2026 With planning case officer 26/02119/HPA

Blackapple 54 Scatterdells Lane Chipperfield Hertfordshire WD4 9EX

Single storey rear extension measuring 8.00m deep with a maxim ridge height of 4.00m and maximum eaves height of 2.70m

Householder Prior Approval Dacorum
21 Oct 2026 With planning case officer 26/02302/FHA

48 Woodlands Avenue Berkhamsted Hertfordshire HP4 2JQ

Hip to gable loft conversion, raising apex of roof and 3 rooflights to front pitch

Full Householder Application Dacorum
21 Oct 2026 With planning case officer 26/02296/FHA

65 Hempstead Lane Potten End Hertfordshire HP4 2RZ

Demolition of the existing single-storey rear extension, connecting link and conservatory, to be replaced with a two-storey pitched-roof extension. Ex...

Full Householder Application Dacorum
21 Oct 2026 With planning case officer 26/02294/LDP

Bridge House 4 Chapel Street Berkhamsted Hertfordshire HP4 2EA

Rear orangery

Lawful Development Certificate Proposed Dacorum
21 Oct 2026 With planning case officer 26/02292/FHA

15 Grange Road Tring Hertfordshire HP23 5JP

Proposed porch with front and side first floor extensions

Full Householder Application Dacorum
20 Oct 2026 With planning case officer 26/02279/FHA

237 Belswains Lane Hemel Hempstead Hertfordshire HP3 9XE

Demolition of existing garage and erection of single storey rear extension and alterations to fenestration

Full Householder Application Dacorum
20 Oct 2026 With planning case officer 26/02226/RET

119 Fennycroft Road Hemel Hempstead Hertfordshire HP1 3NS

Retrospective planning permission for a double storey side extension.

Retention of Development Dacorum
20 Oct 2026 Approved 22 Oct 26/01839/LBC

44 Nettleden Road North Little Gaddesden Berkhamsted Hertfordshire HP4 1PH

Removal of existing front boundary wall. Replace to match existing design and materials on new concrete foundation.

Listed Building Consent Dacorum
19 Oct 2026 With planning case officer 26/02286/FHA

9 Tile Kiln Lane Hemel Hempstead Hertfordshire HP3 8ND

Part one part two storey side/rear extension, front porch, front driveway redesign and all associated works.

Full Householder Application Dacorum
19 Oct 2026 With planning case officer 26/02283/FHA

20 Brickmakers Lane Hemel Hempstead Hertfordshire HP3 8NY

Single storey rear extension, double storey side extension.

Full Householder Application Dacorum
19 Oct 2026 With planning case officer 26/02162/LBC

435 London Road Hemel Hempstead Hertfordshire HP3 9BD

Repair to chimney stack.

Listed Building Consent Dacorum
16 Oct 2026 With planning case officer 26/02272/FHA

New Barn 1 Redling Drive Bovingdon Hemel Hempstead Hertfordshire HP3 0RF

Detached garage.

Full Householder Application Dacorum
15 Oct 2026 With planning case officer 26/02257/FUL

Little Gaddesden Village Hall Church Road Little Gaddesden Hertfordshire HP4 1NX

Replace existing felt roof with new insulated roof.

Full Planning Permission Dacorum
15 Oct 2026 With planning case officer 26/02260/FHA

Blackapple 54 Scatterdells Lane Chipperfield Hertfordshire WD4 9EX

Demolition of existing garage and construction of single storey rear extension and single storey side extensions.

Full Householder Application Dacorum
15 Oct 2026 With planning case officer 26/02240/LDP

2 Langley Avenue Hemel Hempstead Hertfordshire HP3 9NP

Loft conversion with rear dormer

Lawful Development Certificate Proposed Dacorum
15 Oct 2026 With planning case officer 26/02239/HPA

2 Langley Avenue Hemel Hempstead Hertfordshire HP3 9NP

Single-storey rear extension measuring 6.00m deep with a maximum ridge height of 3.00 and a maximum eaves height of 3.00

Householder Prior Approval Dacorum
15 Oct 2026 With planning case officer 26/02238/HPA

2 Langley Avenue Hemel Hempstead Hertfordshire HP3 9NP

Single-storey rear extension measuring 6.00m deep with a maximum ridge height of 3.00 and a maximum eaves height of 3.00

Householder Prior Approval Dacorum
15 Oct 2026 With planning case officer 26/02265/FHA

Cowslip Cottage Hogpits Bottom Flaunden Hertfordshire HP3 0PX

Conversion of an existing single storey outbuilding for re-use as a residential annexe

Full Householder Application Dacorum
15 Oct 2026 With planning case officer 26/02264/FHA

10 Highclere Drive Hemel Hempstead Hertfordshire HP3 8BT

Two storey front extension, First floor side and rear extension. Part garage conversion. Alteration of rear elevation doors and window openings. Drive...

Full Householder Application Dacorum
15 Oct 2026 Awaiting final decision 26/02263/FHA

6 Cedar Road Berkhamsted Hertfordshire HP4 2LA

Single storey front extension, new windows to left elevation and internal alterations.

Full Householder Application Dacorum
14 Oct 2026 With planning case officer 26/02250/FHA

121 Highfield Lane Hemel Hempstead Hertfordshire HP2 5JG

Single storey rear and infill extensions, garage conversion and alterations to front elevation to provide ancillary ground floor annexe.

Full Householder Application Dacorum
14 Oct 2026 With planning case officer 26/02247/FHA

Oaklands 28 Watford Road Kings Langley Hertfordshire WD4 8EA

Demolition of the existing side extension and adjoining garage, and construction of a new single-storey side and rear extension. Addition of front por...

Full Householder Application Dacorum
14 Oct 2026 Approved 23 Oct 26/02120/LDP

Blackapple 54 Scatterdells Lane Chipperfield Hertfordshire WD4 9EX

Single storey side extensions.

Lawful Development Certificate Proposed Dacorum
13 Oct 2026 With planning case officer 26/02211/FUL

90 Pickford Road Markyate Hertfordshire AL3 8RW

Construction of a new Self Build two storey two bedroom dwelling to the side of an existing house. Rear single storey extension to the existing house....

Full Planning Permission Dacorum
13 Oct 2026 Awaiting final decision 26/02229/LDP

24 St Marys Avenue Northchurch Hertfordshire HP4 3RW

Construction of a rear dormer, installation of front rooflights, and internal alterations.

Lawful Development Certificate Proposed Dacorum
13 Oct 2026 With planning case officer 26/02210/FHA

1 Tower Close Berkhamsted Hertfordshire HP4 3NF

One and two storey front extension and new porch.

Full Householder Application Dacorum
13 Oct 2026 With planning case officer 26/02199/FUL

28 - 30 Lower Kings Road Berkhamsted Hertfordshire HP4 2AB

Single Storey Rear Extension maximum height of 3.2 meters.

Full Planning Permission Dacorum
12 Oct 2026 With planning case officer 26/02230/LBC

30 Waterside Kings Langley Hertfordshire WD4 8HH

Internal modern lightweight partition removal (added circa 2008-2010) following recent flood damage circa 2022. New lightweight and non intrusive part...

Listed Building Consent Dacorum
12 Oct 2026 With planning case officer 26/02221/FHA

15 Chaucer Walk Hemel Hempstead Hertfordshire HP2 7PF

Single story front extension

Full Householder Application Dacorum
12 Oct 2026 With planning case officer 26/02204/FHA

The Woodyard Water Lane Bovingdon Hertfordshire HP3 0NA

Single storey side extension

Full Householder Application Dacorum
12 Oct 2026 With planning case officer 26/02152/FHA

The Old Boathouse Castle Wharf Bridge Street Berkhamsted Hertfordshire HP4 2EB

Alterations to roof of dwelling house, replacement of external door with window and minor internal changes.

Full Householder Application Dacorum
12 Oct 2026 Awaiting final decision 26/01745/FUL

23 Abbots Rise Kings Langley Hertfordshire WD4 8AR

Removal of slope. Construct retaining wall. Construction of brick walls to outer leaf. Installation of 11no steps. Aco channels to run parallel to pav...

Full Planning Permission Dacorum
8 Oct 2026 With planning case officer 26/02187/LBC

Small Barn 15B High Street Kings Langley Hertfordshire WD4 8AB

Single storey side extension

Listed Building Consent Dacorum
8 Oct 2026 With planning case officer 26/02186/FHA

Small Barn 15B High Street Kings Langley Hertfordshire WD4 8AB

Single storey side extension

Full Householder Application Dacorum
8 Oct 2026 With planning case officer 26/02185/FHA

Evergreen House 24 North Road Berkhamsted Hertfordshire HP4 3DX

Demolition of existing rear porch and single storey side extension. Construction of single storey extension and refurbishment of existing property. In...

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

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