House extensions in Watford

Watford received 407 householder applications in the last 12 months - about 8 a week. Rear extensions and dormers are the most common. Of the 344 decided so far, 273 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 107 applications
21 Oct 2026 Pending consideration 26/00835/HPD

6 Bowmans Green Watford Hertfordshire WD25 9UE

The erection of a single storey rear extension which would extend beyond the rear wall of the original house by 6.00m for which the maximum height wou...

Householder Permitted Development Watford
20 Oct 2026 Pending consideration 26/00775/AAPA

The Spinney Watford WD17 4QF

Notification of development for a single-storey upward extension to Block A to provide 6no. residential flats, cycle parking, car parking and associat...

Prior Approval detached buildings Watford
19 Oct 2026 Pending consideration 26/00822/HPD

11 The Chase Watford WD18 7JQ

The erection of a single storey rear extension which would extend beyond the rear wall of the original house by 6.0m for which the maximum height woul...

Householder Permitted Development Watford
19 Oct 2026 Pending consideration 26/00821/FULH

10 Armand Close Watford Hertfordshire WD17 4SQ

Conversion of existing side garage into habitable space, erection of part ground floor and adjacent first floor side extensions, extension of existing...

Full householder Watford
19 Oct 2026 Pending consideration 26/00653/FUL

65 Chester Road Watford Hertfordshire WD18 0RG

Convert and Change of Use at the rear Ground and First Floor. Extension at the rear at first floor to Form a Self-Contained One-Bedroom Flat

Full Planning Permission Watford
13 Oct 2026 Pending consideration 26/00806/HPD

101 Sussex Road Watford WD24 5HR

The erection of a single-storey rear extension which would extend beyond the rear wall of the original house by 6.0m for which the maximum height woul...

Householder Permitted Development Watford
13 Oct 2026 Pending consideration 26/00805/HPD

101 Sussex Road Watford WD24 5HR

The erection of a single storey rear extension which would extend beyond the rear wall of the original house by 6.0m for which the maximum height woul...

Householder Permitted Development Watford
12 Oct 2026 Pending consideration 26/00760/LDC

9 Longspring Watford WD24 6NA

Lawful Development Certificate for the erection of a single storey detached 'L' shaped outbuilding,

Lawful Development Certificate Watford
9 Oct 2026 Pending consideration 26/00770/FULH

18 Hazel Tree Road Watford Hertfordshire WD24 6RQ

Erection of single storey front extension

Full householder Watford
9 Oct 2026 Pending Decision 26/00771/LDC

18 Hazel Tree Road Watford Hertfordshire WD24 6RQ

Lawful development certificate for proposed hip to gable loft conversion including rear dormer and x3 front roof lights

Lawful Development Certificate Watford
9 Oct 2026 Pending consideration 26/00746/LDC

29 Francis Road Watford Hertfordshire WD18 0QE

Lawful development certificate for proposed erection of L-shaped rear roof dormers including the installation of two front rooflights

Lawful Development Certificate Watford
8 Oct 2026 Pending consideration 26/00782/FULH

50 Butterwick Watford Hertfordshire WD25 9SD

Erection of a front porch and portico.

Full householder Watford
8 Oct 2026 Pending consideration 26/00793/HPD

126 Woodmere Avenue Watford Hertfordshire WD24 7LW

The erection of a single storey rear extension which would extend beyond the rear wall of the original house by 6.0m for which the maximum height woul...

Householder Permitted Development Watford
6 Oct 2026 Approved 12 Oct 26/00763/LDC

134 Balmoral Road Watford WD24 4ET

Lawful Development Certificate for proposed hip to gable loft conversion including rear dormer and x2 front roof lights.

Lawful Development Certificate Watford
5 Oct 2026 Pending consideration 26/00781/HPD

50 Butterwick Watford Hertfordshire WD25 9SD

The erection of a single storey rear extension which would extend beyond the rear wall of the original house by 6.0m for which the maximum height woul...

Householder Permitted Development Watford
5 Oct 2026 Pending consideration 26/00769/HPD

18 Hazel Tree Road Watford Hertfordshire WD24 6RQ

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

Householder Permitted Development Watford
2 Oct 2026 Pending consideration 26/00729/FUL

Junction Dental Centre 6 Station Road Watford WD17 1EQ

Erection of a rear first floor extension and internal alterations.

Full Planning Permission Watford
2 Oct 2026 Pending consideration 26/00791/FULH

2A Lower Paddock Road Watford WD19 4DS

Erection of a ground floor rear extension. Interior alteration, floor plan redesign and all associated works.

Full householder Watford
2 Oct 2026 Pending consideration 26/00777/HPD

984 St Albans Road Watford WD25 9NP

The erection of a single storey rear extension which would extend beyond the rear wall of the original house by 6.0m for which the maximum height woul...

Householder Permitted Development Watford
1 Oct 2026 Pending consideration 26/00699/FULH

24 Kingswood Road Watford Hertfordshire WD25 0EE

Erection of single storey front, rear and double storey side extensions and external and internal alterations

Full householder Watford
30 Sept 2026 Pending Decision 26/00761/HPD

28 Eastfield Avenue Watford Hertfordshire WD24 4HQ

The erection of a single storey rear extension which would extend beyond the rear wall of the original house by 5.00m for which the maximum height wou...

Householder Permitted Development Watford
30 Sept 2026 Pending consideration 26/00752/FULH

3 East Drive Watford Hertfordshire WD25 0AH

Erection of single storey side extension and conversion of existing garage into habitable room

Full householder Watford
29 Sept 2026 Pending consideration 26/00739/FULH

61 Park Road Watford WD17 4QJ

Erection of a first-floor extension over the existing flat roof. alongside a new loft conversion to provide additional habitable accommodation.

Full householder Watford
28 Sept 2026 Pending consideration 26/00759/FULH

Gorran Haven Trevellance Way Watford WD25 0LY

Erection of a double storey side and rear extensions and a single storey front extension.

Full householder Watford
28 Sept 2026 Approved 9 Oct 26/00755/LDC

498 Whippendell Road Watford WD18 7QJ

Lawful Development Certificate for a loft conversion with rear dormer window.

Lawful Development Certificate Watford
28 Sept 2026 Pending consideration 26/00754/FULH

498 Whippendell Road Watford WD18 7QJ

Erection of a ground floor wrap around extension, plus front porch.

Full householder Watford
28 Sept 2026 Pending consideration 26/00756/FULH

40 Capel Road Watford WD19 4AE

Erection of single storey rear extension

Full householder Watford
28 Sept 2026 Approved 20 Oct 26/00757/NONMAT

39 Cassiobury Drive Watford WD17 3AA

Non - material amendment pursuant to planning permission 26/00153/FULH for change from side window on lower ground floor to side door facing brick wal...

Non-material amendment of PP Watford
28 Sept 2026 Pending Decision 26/00758/HPD

21 Chilcott Road Watford Hertfordshire WD24 5LF

The erection of a single storey rear extension which would extend beyond the rear wall of the original house by 6.00m for which the maximum height wou...

Householder Permitted Development Watford
24 Sept 2026 Pending consideration 26/00748/FULH

50 The Avenue Watford WD17 4NX

Erection of ground floor single storey front and rear infill extension, first floor part side extension and loft conversion including rear dormer and ...

Full householder Watford
23 Sept 2026 Pending consideration 26/00613/FUL

137 - 139 St Albans Road Watford WD17 1RA

Erection of a single storey rear extension and external alterations to create one additional flat and enlarge an existing flat.

Full Planning Permission Watford
22 Sept 2026 Pending consideration 26/00727/FUL

105 Horseshoe Lane Watford WD25 7HS

Demolition of an existing side extension to facilitate a single storey side / rear and front extension, and changes to the existing porch roof.

Full Planning Permission Watford
22 Sept 2026 Pending Decision 26/00730/HPD

15 Munden Grove Watford WD24 7EF

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

Householder Permitted Development Watford
21 Sept 2026 Approved 1 Oct 26/00740/LDC

344 Hagden Lane Watford WD18 7SH

Lawful development certificate for proposed erection of outbuilding (12mx5m) at the South-West corner of the rear garden

Lawful Development Certificate Watford
21 Sept 2026 Pending consideration 26/00737/FULH

48 Parkside Drive Watford WD17 3AX

Erection of a single storey rear extension, garage conversion and Interal Works to an existing two storey detached dwellinghouse.

Full householder Watford
17 Sept 2026 Approved 16 Oct 26/00734/FULH

9 Observer Drive Watford WD18 7GR

Garage conversion into habitable room

Full householder Watford
15 Sept 2026 Refused 13 Oct 26/00713/FULH

22 Felden Close Watford Hertfordshire WD25 9QW

Erection of single storey rear and side wrap around extension and construction of front porch.

Full householder Watford
14 Sept 2026 Approved 23 Sep 26/00718/LDC

21 Chilcott Road Watford Hertfordshire WD24 5LF

Lawful Development Certificate for a proposed dormer loft extension and 2 roof lights.

Lawful Development Certificate Watford
14 Sept 2026 Pending consideration 26/00724/FULH

8 Richmond Drive Watford WD17 3BG

Demolition of existing garage to side and erection of single storey side extension

Full householder Watford
14 Sept 2026 Approved 23 Sep 26/00726/LDC

3 Coningesby Drive Watford Hertfordshire WD17 3BD

Lawful development certificate for proposed new front porch and conversion of the existing garage into a habitable space

Lawful Development Certificate Watford
14 Sept 2026 Pending consideration 26/00725/FULH

25 Bellamy Close Watford Hertfordshire WD17 4RN

Erection of single storey rear extension.

Full householder Watford
14 Sept 2026 Pending consideration 26/00667/FULH

17 Shepherds Road Watford WD18 7HU

Demolition of existing garden outbuildings and erection of new garden outbuilding

Full householder Watford
10 Sept 2026 Approved 14 Oct 26/00566/FULH

127 Hagden Lane Watford WD18 7SR

Erection of a ground floor single storey side extension.

Full householder Watford
9 Sept 2026 Pending consideration 26/00690/FULH

346 And 348 Cassiobury Drive Watford WD17 3AW

Erection of single storey and first floor rear extensions to the existing dwelling, alterations to the existing roof and associated internal and exter...

Full householder Watford
9 Sept 2026 Approved 13 Oct 26/00698/FULH

15 Wentworth Close Watford Hertfordshire WD17 4LW

Erection of double and single storey front, side and rear extensions with internal alterations

Full householder Watford
9 Sept 2026 Approved 9 Oct 26/00705/HPD

115 Parkside Drive Watford WD17 3AY

The erection of a single storey rear extension which would extend beyond the rear wall of the original house by 8.00m for which the maximum height wou...

Householder Permitted Development Watford
9 Sept 2026 Approved 18 Sep 26/00714/LDC

25 Westbury Road Watford Hertfordshire WD18 0DL

Lawful development certificate for proposed loft conversion including rear dormer and x front rooflights

Lawful Development Certificate Watford
8 Sept 2026 Pending consideration 26/00662/FULH

8 Bellmount Wood Avenue Watford Hertfordshire WD17 3BW

Erection of ground floor single storey rear extension and part first floor extension

Full householder Watford
8 Sept 2026 Refused 9 Oct 26/00712/FULH

32 Gade Avenue Watford Hertfordshire WD18 7LG

Erection of a single storey rear extension and internal alterations.

Full householder Watford
7 Sept 2026 Pending Decision 26/00652/FUL

48 Coates Way Watford WD25 9NS

Erection of a single storey outbuilding at the rear of the property.

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

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