House extensions in Dacorum

Dacorum received 469 householder applications in the last 12 months - about 9 a week. Rear extensions and side extensions are the most common. Of the 301 decided so far, 265 were approved. If you're planning your own, the applications below show what people nearby applied for and how the council decided.

251 last 90 days
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86 last 30 days
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29 last 14 days

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Showing 50 of 251 applications
26/01545/FHA 2 days ago With planning case officer

5 Greenway Berkhamsted Hertfordshire HP4 3JD

Removal of the existing conservatory and its replacement with a single storey rear extension

Dacorum
26/01534/LDP 9 Jul 2026 With planning case officer

40 Anchor Lane Hemel Hempstead Hertfordshire HP1 1TY

Loft conversion, outbuilding and porch extension

Dacorum 9 Jul 2026
26/01522/FHA 8 Jul 2026 With planning case officer

49 Roseheath Hemel Hempstead Hertfordshire HP1 2NG

New porch.

Dacorum 8 Jul 2026
26/01521/FHA 8 Jul 2026 With planning case officer

344 Galley Hill Hemel Hempstead Hertfordshire HP1 3JZ

First floor side extension and single storey rear extension

Dacorum 8 Jul 2026
26/01520/FHA 8 Jul 2026 With planning case officer

6 Cobb Road Berkhamsted Hertfordshire HP4 3LE

Single-storey rear and side extension

Dacorum 8 Jul 2026
26/01519/LDP 8 Jul 2026 With planning case officer

10 Cherry Gardens Tring Hertfordshire HP23 4EA

Garage conversion, infill extension and fenestration alterations

Dacorum 8 Jul 2026
26/01533/LDP 8 Jul 2026 With planning case officer

Great Gaddesden Primary School Church Meadow Great Gaddesden Hemel Hempstead Hertfordshire HP1 3BT

Replacement windows.

Dacorum 8 Jul 2026
26/01523/HPA 8 Jul 2026 Awaiting final decision

6 Bennetts End Road Hemel Hempstead Hertfordshire HP3 8DG

Single storey rear extension measuring 6.00m deep with a maxim ridge height of 3.00m and maximum eaves height of 2.75m

Dacorum 8 Jul 2026
26/01507/LDP 7 Jul 2026 With planning case officer

32 Cardy Road Hemel Hempstead Hertfordshire HP1 1SQ

Single storey rear extension

Dacorum 7 Jul 2026
26/01505/FHA 7 Jul 2026 With planning case officer

509 Barnacres Road Hemel Hempstead Hertfordshire HP3 8AR

Single storey rear extension, double storey rear and side extension, new first floor obscure glass side window and replacement of existing wall in fro...

Dacorum 7 Jul 2026
26/01503/HPA 6 Jul 2026 With planning case officer

31 Collett Road Hemel Hempstead Hertfordshire HP1 1HY

Single storey rear extension measuring 6m deep with a maxim ridge height of 3m and maximum eaves height of 3m

Dacorum 6 Jul 2026
26/01500/FHA 6 Jul 2026 With planning case officer

Fairway Bell Lane Northchurch Hertfordshire HP4 3TS

Single storey rear extension

Dacorum 6 Jul 2026
26/01501/FHA 6 Jul 2026 With planning case officer

23 Hill View Berkhamsted Hertfordshire HP4 1SA

Single storey rear and garage link extensions and garage conversion

Dacorum 6 Jul 2026
26/01499/FHA 6 Jul 2026 With planning case officer

Meadow Barn Crawleys Lane Wigginton Tring Hertfordshire HP23 6FF

Carport and Store

Dacorum 6 Jul 2026
26/01502/FUL 6 Jul 2026 With planning case officer

Blue Court Mark Road Hemel Hempstead Hertfordshire HP2 7DN

Change of use of skip hire yard and warehouse building to asbestos storage facility with ancillary office space (Sui Generis Use Class) and extension ...

Dacorum 6 Jul 2026
26/01490/FHA 3 Jul 2026 With planning case officer

3 Crossfell Road Hemel Hempstead Hertfordshire HP3 8RB

Single storey rear and single storey side extension.

Full Householder Application Dacorum 3 Jul 2026
26/01496/FHA 3 Jul 2026 Awaiting final decision

54 Homefield Road Hemel Hempstead Hertfordshire HP2 4DA

Single story front extension

Full Householder Application Dacorum 3 Jul 2026
26/01487/LDP 2 Jul 2026 Awaiting final decision

15 Old Watling Street Flamstead St Albans Hertfordshire AL3 8HL

Single storey side extension, single storey rear extension and hip-to-gable roof extension with rear dormer. Insert 2x skylights in the front slope of...

Lawful Development Certificate Proposed Dacorum 2 Jul 2026
26/01489/LBC 2 Jul 2026 With planning case officer

The Red Lion Leighton Buzzard Road Water End Hemel Hempstead Hertfordshire HP1 3BD

Proposed removal of the existing ground floor door and side windows on the north west elevation, creation of a full width recessed opening beneath the...

Listed Building Consent Dacorum 2 Jul 2026
26/01481/FHA 1 Jul 2026 With planning case officer

60 Dundale Road Tring Hertfordshire HP23 5BU

Demolition of existing single storey side projection. Construction of two-storey side & front extension. Construction of open porch to front & interna...

Full Householder Application Dacorum 1 Jul 2026
26/01480/LBC 1 Jul 2026 With planning case officer

The Barn Little Heath Farm Little Heath Lane Potten End Berkhamsted Hertfordshire HP4 2RT

Mezzanine and Roof Truss works.

Listed Building Consent Dacorum 1 Jul 2026
26/01464/LDP 30 Jun 2026 With planning case officer

27 King Street Tring Hertfordshire HP23 6BJ

Single storey extension.

Lawful Development Certificate Proposed Dacorum 30 Jun 2026
26/01467/FHA 30 Jun 2026 With planning case officer

19 Lombardy Drive Berkhamsted Hertfordshire HP4 2LG

Levelling the end of our garden and putting in a garden office and a shed.

Full Householder Application Dacorum 30 Jun 2026
26/01465/FHA 30 Jun 2026 With planning case officer

191 Turners Hill Hemel Hempstead Hertfordshire HP2 4LN

Single storey rear extension, alterations to front entrance, and internal alterations

Full Householder Application Dacorum 30 Jun 2026
26/01468/LBC 30 Jun 2026 With planning case officer

The Two Brewers Inn The Common Chipperfield Kings Langley Hertfordshire WD4 9BS

Removing shrubs and ivy from the rear elevation, rebuilding the unstable rear wall to match existing, repairing brick/flint work to the northeast gabl...

Listed Building Consent Dacorum 30 Jun 2026
26/01457/FHA 29 Jun 2026 With planning case officer

48 Wingrave Road Tring Hertfordshire HP23 5HE

Rear extension of existing single storey kitchen/bathroom block, conversion of upper floor rear bedroom to bathroom. Creation of second bedroom in new...

Full Householder Application Dacorum 29 Jun 2026
26/01459/LDP 29 Jun 2026 With planning case officer

28 Friars Walk Tring Hertfordshire HP23 4AP

Garage Conversion Extension and Front Porch

Lawful Development Certificate Proposed Dacorum 29 Jun 2026
26/01456/FHA 29 Jun 2026 With planning case officer

34 Covert Road Northchurch Hertfordshire HP4 3RS

Rear single storey flat roof extension with lantern roof light and rear roof dormer and removal of 2 chimneys. Demolition of 2 rear garden sheds and i...

Full Householder Application Dacorum 29 Jun 2026
26/01447/FHA 26 Jun 2026 With planning case officer

23 Glenview Road Hemel Hempstead Hertfordshire HP1 1TB

Single storey rear extension.

Full Householder Application Dacorum 26 Jun 2026
26/01442/FHA 26 Jun 2026 With planning case officer

West Mead Leverstock Green Road Hemel Hempstead Hertfordshire HP3 8QB

Single-storey side extension

Full Householder Application Dacorum 26 Jun 2026
26/01449/FHA 26 Jun 2026 With planning case officer

Holly Bush Glen Water End Road Potten End Berkhamsted Hertfordshire HP4 2SH

Single storey rear extension, raising roof with front and rear dormers

Full Householder Application Dacorum 26 Jun 2026
26/01470/FHA 26 Jun 2026 With planning case officer

Woodcote Beechwood Drive Aldbury Tring Hertfordshire HP23 5SB

Proposed replacement of conservatory roof to slate

Full Householder Application Dacorum 26 Jun 2026
26/01429/FHA 25 Jun 2026 With planning case officer

29 Parsons Close Flamstead St Albans Hertfordshire AL3 8EB

Single-storey rear extension, front porch and solar panels on existing roof slope.

Full Householder Application Dacorum 25 Jun 2026
26/01444/LDP 25 Jun 2026 Awaiting final decision

11 Siskin Drive Hemel Hempstead Hertfordshire HP3 0FT

Loft Conversion

Lawful Development Certificate Proposed Dacorum 25 Jun 2026
26/01445/FHA 25 Jun 2026 With planning case officer

22 West Road Berkhamsted Hertfordshire HP4 3HT

Construction of single storey rear extension alterations to roof of previous rear extension, internal alterations and installation of side door , mino...

Full Householder Application Dacorum 25 Jun 2026
26/01430/FHA 25 Jun 2026 With planning case officer

Greenbanks Toms Hill Road Aldbury Tring Hertfordshire HP23 5SA

Single storey storage structure

Full Householder Application Dacorum 25 Jun 2026
26/01439/FHA 25 Jun 2026 With planning case officer

Heatherdale George Street Berkhamsted Hertfordshire HP4 2EW

Construction of a detached garage and store with ancillary habitable space at first floor

Full Householder Application Dacorum 25 Jun 2026
26/01441/FHA 25 Jun 2026 With planning case officer

Blackberry Barn Chapel End Lane Wilstone Tring Hertfordshire HP23 4NY

Remove the 2 glass Juliet Balconies . Replace with 2 open Juliet Balconies.

Full Householder Application Dacorum 25 Jun 2026
26/01419/FHA 24 Jun 2026 With planning case officer

42 Durrants Lane Northchurch Berkhamsted Hertfordshire HP4 3PL

Two-storey side and rear and single-storey front extensions

Full Householder Application Dacorum 24 Jun 2026
26/01420/FHA 24 Jun 2026 With planning case officer

The Laurels Shendish Drive Leading From London Road Shendish Hemel Hempstead Hertfordshire HP3 0AA

Detached 3 car garage.

Full Householder Application Dacorum 24 Jun 2026
26/01401/FHA 23 Jun 2026 With planning case officer

27 Wrensfield Hemel Hempstead Hertfordshire HP1 1RN

Garage conversion, porch extension, single storey side extension with new pitched roof over. First floor front extension with side facing dormers and ...

Full Householder Application Dacorum 23 Jun 2026
26/01400/LDP 23 Jun 2026 With planning case officer

27 Wrensfield Hemel Hempstead Hertfordshire HP1 1RN

Single storey front porch extension. Installation of front facing velux type rooflight.

Lawful Development Certificate Proposed Dacorum 23 Jun 2026
26/01404/FHA 23 Jun 2026 With planning case officer

32 Horseshoe Close Hemel Hempstead Hertfordshire HP1 2DY

Single storey extension

Full Householder Application Dacorum 23 Jun 2026
26/01403/LBC 23 Jun 2026 With planning case officer

14 Leighton Buzzard Road Water End Hemel Hempstead Hertfordshire HP1 3BH

Retrospective Listed Building Consent for the retention of a 1.8 metre high timber featheredge boundary fence extending approximately 26 metres along ...

Listed Building Consent Dacorum 23 Jun 2026
26/01415/FHA 23 Jun 2026 With planning case officer

17 Greystoke Close Berkhamsted Hertfordshire HP4 3JJ

First Floor side extension over the existing flat roof. Partial garage conversion. Internal alterations. Porch canopy roof / New single storey roof to...

Full Householder Application Dacorum 23 Jun 2026
26/01414/FHA 23 Jun 2026 With planning case officer

58 St Albans Road Hemel Hempstead Hertfordshire HP2 4BA

Part two storey part Single storey rear extension including conversion of rear garage, hip to gable loft conversion with rear dormer.

Full Householder Application Dacorum 23 Jun 2026
26/01418/RET 23 Jun 2026 With planning case officer

1 The Mews Gravel Path Berkhamsted Hertfordshire HP4 2EF

Retrospective application for the replacement of 5no. windows.

Retention of Development Dacorum 23 Jun 2026
26/01417/LBC 23 Jun 2026 With planning case officer

Rent Street Barns 62 Chipperfield Road Bovingdon Hemel Hempstead Hertfordshire HP3 0JW

Single storey side and rear extension, and internal alterations

Listed Building Consent Dacorum 23 Jun 2026
26/01416/FHA 23 Jun 2026 With planning case officer

Rent Street Barns 62 Chipperfield Road Bovingdon Hemel Hempstead Hertfordshire HP3 0JW

Single storey side and rear extension, and internal alterations.

Full Householder Application Dacorum 23 Jun 2026
26/01413/FHA 23 Jun 2026 With planning case officer

1 Hope Cottages King Street Tring Hertfordshire HP23 6BG

New rear dormer and front roof lights.

Full Householder Application Dacorum 23 Jun 2026
Recency
Last 2 weeks
2-4 weeks
1-2 months
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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 — taller, larger, 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 with objections) 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.