House extensions in Dacorum

Dacorum received 694 householder applications in the last 12 months - about 13 a week. Rear extensions and dormers are the most common. Of the 516 decided so far, 458 were approved. If you're planning your own, the applications below show what people nearby applied for and how the council decided.

220
|
66
|
36
Get alerts for Dacorum

Filter applications

Date receivedLast 90 days
Date receivedLast 90 days
Select one year, or two for a range.
Number of homesAny
StatusAny
Application routeAny
Application type1 selected
KeywordsNone
Match

Matches words or phrases in the application address and description.

Showing 50 of 220 applications
Yesterday With planning case officer 26/01799/FHA

1 Stocks Garden Cottages Stocks Road Aldbury Hertfordshire HP23 5RZ

Rebuild single storey side extension, garage conversion, and new replacement windows

Full Householder Application Dacorum
Yesterday With planning case officer 26/01929/FHA

63 High Street Kings Langley Hertfordshire WD4 9HU

Proposed alterations to existing outbuilding

Full Householder Application Dacorum
2 days ago With planning case officer 26/01943/FHA

Grove House 11A Damask Close Tring Hertfordshire HP23 5UA

Installation of an electric traditional sauna.

Full Householder Application Dacorum
2 days ago With planning case officer 26/01963/LDP

Flint House Roe End Lane Markyate Hertfordshire AL3 8AG

Outbuilding for use as a home gym, games room and home business (skin care treatment) and outdoor swimming pool

Lawful Development Certificate Proposed Dacorum
8 Sept 2026 With planning case officer 26/01947/FHA

22 Meadow Close Tring Hertfordshire HP23 5BT

Demolition of existing rear and side extensions, construction of part single- and part two-storey rear/side extensions, and alterations to the front e...

Full Householder Application Dacorum
8 Sept 2026 With planning case officer 26/01962/HPA

8 Haywood Drive Hemel Hempstead Hertfordshire HP3 0SA

Single storey rear extension measuring 4.00m deep with a maximum height of 4.00m and a maximum eaves height of 2.75m

Householder Prior Approval Dacorum
8 Sept 2026 With planning case officer 26/01959/FHA

62B Belmont Road Hemel Hempstead Hertfordshire HP3 9NU

Two storey front extension, garage conversion and alternations to the fenestration

Full Householder Application Dacorum
8 Sept 2026 With planning case officer 26/01961/FUL

Rosehaven Lockers Park Lane Hemel Hempstead Hertfordshire HP1 1TQ

Conversion of loft space, including the formation rear side dormers to facilitate change of use from C3 to Sui Generis 8 Person HMO includes provision...

Full Planning Permission Dacorum
8 Sept 2026 With planning case officer 26/01790/FUL

Boxmoor Social Club 81 Horsecroft Road Hemel Hempstead Hertfordshire HP1 1PY

Lay paving slabs to front of club.

Full Planning Permission Dacorum
8 Sept 2026 With planning case officer 26/01890/FHA

2 Castle Gateway Berkhamsted Hertfordshire HP4 1LH

Proposed demolition of the existing rear conservatory, reinstatement of rear elevation of the dwelling to reflect the original footprint and form of t...

Full Householder Application Dacorum
8 Sept 2026 With planning case officer 26/01933/LBC

146 Piccotts End Hemel Hempstead Hertfordshire HP1 3AU

Repair dry rot intestation at the front door lobby, below the front left ground floor window and the staircase

Listed Building Consent Dacorum
8 Sept 2026 With planning case officer 26/01584/FHA

Holly Tree Cottage Long Lane Bovingdon Hemel Hempstead Hertfordshire HP3 0PZ

Roof extensions including front and rear dormers, single storey side and rear extensions, changes to fenestration.

Full Householder Application Dacorum
8 Sept 2026 With planning case officer 26/01584/UPA

Holly Tree Cottage Long Lane Bovingdon Hemel Hempstead Hertfordshire HP3 0PZ

Roof extensions including front and rear dormers, single storey side and rear extensions, changes to fenestration.

Additional Storey Prior Approval Dacorum
7 Sept 2026 With planning case officer 26/01940/FHA

103 Western Road Tring Hertfordshire HP23 4BN

Hip to gable extensions, new rear elevation dormer window, roof light and velux roof lights to front elevation and open porch.

Full Householder Application Dacorum
7 Sept 2026 With planning case officer 26/01942/FHA

16 Dellfield Close Berkhamsted Hertfordshire HP4 1DS

Garage conversion, two storey rear infill extension, demolition of existing conservatory, new porch canopy, new windows and doors, new render and bric...

Full Householder Application Dacorum
7 Sept 2026 With planning case officer 26/01913/FHA

68 Widmore Drive Hemel Hempstead Hertfordshire HP2 5JL

Proposed two-storey side and rear extension

Full Householder Application Dacorum
4 Sept 2026 With planning case officer 26/01918/FHA

23 Hunters Oak Hemel Hempstead Hertfordshire HP2 7SN

Construction of first-floor side extensions over existing single-storey side structures with associated roof alterations and changes to fenestration.

Full Householder Application Dacorum
4 Sept 2026 With planning case officer 26/01924/HPA

Daymar London Road Hemel Hempstead Hertfordshire HP1 2RE

Single Storey rear extension measuring 7m deep with a maxim ridge height of 2.47m and maximum eaves height of 2.47m

Householder Prior Approval Dacorum
4 Sept 2026 With planning case officer 26/01925/LDP

Daymar London Road Hemel Hempstead Hertfordshire HP1 2RE

2no. side extensions

Lawful Development Certificate Proposed Dacorum
4 Sept 2026 With planning case officer 26/01926/LDP

Daymar London Road Hemel Hempstead Hertfordshire HP1 2RE

Partial hip to gable loft conversion with rear dormer, single storey rear extension

Lawful Development Certificate Proposed Dacorum
4 Sept 2026 With planning case officer 26/01901/FHA

86 Wood Lane End Hemel Hempstead Hertfordshire HP2 4RF

Double storey and single story side extensions, rear extension, front porch and alterations

Full Householder Application Dacorum
3 Sept 2026 With planning case officer 26/01916/FHA

3 Chiltern Way Tring Hertfordshire HP23 5JX

Replacement conservatory with single storey rear extension.

Full Householder Application Dacorum
3 Sept 2026 With planning case officer 26/01914/LDP

Rosehaven Lockers Park Lane Hemel Hempstead Hertfordshire HP1 1TQ

Hip to gable loft conversion with rear dormer

Lawful Development Certificate Proposed Dacorum
3 Sept 2026 With planning case officer 26/01906/LBC

The Pale Farm The Street Chipperfield Kings Langley Hertfordshire WD4 9BH

Replacement windows.

Listed Building Consent Dacorum
3 Sept 2026 With planning case officer 26/01905/FHA

27A Sebright Road Hemel Hempstead Hertfordshire HP1 1QY

First-floor side extension, roof alterations and conversion to form habitable accommodation in roofspace with roof-mounted solar panels Construction o...

Full Householder Application Dacorum
2 Sept 2026 With planning case officer 26/01904/FUL

Landmark Dental 157 London Road Hemel Hempstead Hertfordshire HP3 9SQ

Single-storey rear infill extension, alterations to roof from dual-pitched to flat roof, rebuilding of existing outbuilding for storage, and construct...

Full Planning Permission Dacorum
2 Sept 2026 With planning case officer 26/01896/FHA

2 Lower Adeyfield Road Hemel Hempstead Hertfordshire HP2 5BZ

Ground floor rear extension.

Full Householder Application Dacorum
2 Sept 2026 With planning case officer 26/01895/LDP

11 St Albans Hill Hemel Hempstead Hertfordshire HP3 9NG

Proposed internal alterations to the existing main dwelling and changes to existing fenestrations to the rear and side of the existing main dwelling

Lawful Development Certificate Proposed Dacorum
1 Sept 2026 With planning case officer 26/01893/FHA

28 Friars Walk Tring Hertfordshire HP23 4AP

Garage conversion and front extension with integral porch.

Full Householder Application Dacorum
1 Sept 2026 With planning case officer 26/01891/FHA

40 Maynard Road Hemel Hempstead Hertfordshire HP2 4TR

Two storey rear extension.

Full Householder Application Dacorum
1 Sept 2026 With planning case officer 26/01903/FHA

212 Windmill Road Hemel Hempstead Hertfordshire HP2 4BU

Single storey rear extension. Garage conversion to habitable space to gym/office with single storey extension.

Full Householder Application Dacorum
1 Sept 2026 With planning case officer 26/01887/FHA

Camilla House 251 High Street Berkhamsted Hertfordshire HP4 1AB

Single storey side/rear extension, rear dormer with 2no. rooflights, new driveway surfacing and window replacement.

Full Householder Application Dacorum
1 Sept 2026 With planning case officer 26/01871/FUL

Long Marston Cricket Club Cheddington Lane Long Marston Hertfordshire HP23 4QP

Single storey front, side and rear extension to existing cricket club pavilion. Demolition of existing machinery store and construction of new machine...

Full Planning Permission Dacorum
28 Aug 2026 With planning case officer 26/01852/APA

Shevington Venus Hill Bovingdon Hemel Hempstead Hertfordshire HP3 0PG

Conversion of existing agricultural buildings, to create 3 x 2-bed dwellings. Includes extension to rear of two units by less than 4m on existing hard...

Agricultural to Resi. Prior Approval Dacorum
28 Aug 2026 With planning case officer 26/01877/FHA

Langfords 4 Station Road Tring Hertfordshire HP23 5NG

Replacement of conservatory with single storey rear extension and replacement roof to boot room.

Full Householder Application Dacorum
28 Aug 2026 With planning case officer 26/01873/FHA

3 Old Orchard Mews Berkhamsted Hertfordshire HP4 2DQ

Garage conversion and single storey extension connecting House to Garage (previously approved as part of application - 23/01159/FHA)

Full Householder Application Dacorum
27 Aug 2026 Approved 26/01855/LDP

30 Trooper Road Aldbury Hertfordshire HP23 5RW

Replacement and amendments to existing windows and external doors. Installation of an air source heat pump.

Lawful Development Certificate Proposed Dacorum
26 Aug 2026 With planning case officer 26/01848/FHA

27 Station Road Berkhamsted Hertfordshire HP4 2EY

Single storey rear extension. Replacement of windows to front, rear, side elevations. New window to side elevation. Relocation of principal entrance d...

Full Householder Application Dacorum
25 Aug 2026 With planning case officer 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
25 Aug 2026 With planning case officer 26/01836/FHA

19 Deans Furlong Tring Hertfordshire HP23 4AR

Replacement of conservatory with single storey rear extension.

Full Householder Application Dacorum
25 Aug 2026 With planning case officer 26/01838/FHA

25 Clarkes Spring Aldbury Hertfordshire HP23 5QL

Single storey rear extension. Partial garage conversion and single storey front/ side extension

Full Householder Application Dacorum
25 Aug 2026 With planning case officer 26/01837/LDP

Loughrigg Gravel Path Berkhamsted Hertfordshire HP4 2PJ

Conversion of existing first-floor space above the garage to ancillary guest accommodation, including a bedroom, ensuite, kitchenette, rooflight and a...

Lawful Development Certificate Proposed Dacorum
24 Aug 2026 With planning case officer 26/01826/LDP

21 Basildon Square Hemel Hempstead Hertfordshire HP2 6AS

Single storey rear extension

Lawful Development Certificate Proposed Dacorum
24 Aug 2026 With planning case officer 26/01829/LDP

Woodside 4 Threefields Sheethanger Lane Felden Hemel Hempstead Hertfordshire HP3 0BJ

Single storey side extension. New dormer window to rear roof face.

Lawful Development Certificate Proposed Dacorum
21 Aug 2026 With planning case officer 26/01819/FHA

Meadow View Gravel Path Berkhamsted Hertfordshire HP4 2PH

Single storey rear extension, following demolition of conservatory and rear dormer infills.

Full Householder Application Dacorum
21 Aug 2026 With planning case officer 26/01820/FHA

4 Woodlands Avenue Berkhamsted Hertfordshire HP4 2JH

Relocation of entrance door to front elevation with new porch and steps. Installation of render to brickwork and cladding to rear. Replacement windows

Full Householder Application Dacorum
21 Aug 2026 With planning case officer 26/01823/LDP

50 Argyll Road Hemel Hempstead Hertfordshire HP2 6ND

Loft conversion, rear dormer and front velux windows

Lawful Development Certificate Proposed Dacorum
20 Aug 2026 With planning case officer 26/01827/FHA

2 Fairacre Hemel Hempstead Hertfordshire HP3 9TR

Double storey side extension

Full Householder Application Dacorum
20 Aug 2026 Awaiting final decision 26/01813/FHA

Long Gable 40 Sheethanger Lane Felden Hemel Hempstead Hertfordshire HP3 0BQ

Demolition of existing garage and porch canopy to the front and gym to the rear, removal of chimney stack to the side. Rear and side single storey ext...

Full Householder Application Dacorum
20 Aug 2026 Awaiting final decision 26/01687/FHA

85 Brickmakers Lane Hemel Hempstead Hertfordshire HP3 8PA

Single storey side and front hall extension.

Full Householder Application Dacorum
Recency
Last 2 weeks
2-4 weeks
1-2 months
Older

Get free email alerts for new extensions applications in Dacorum

Set up alerts

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.