House extensions in St Albans

St Albans received 531 householder applications in the last 12 months - about 10 a week. Rear extensions and garage works are the most common. Of the 62 decided so far, 55 were approved. If you're planning your own, the applications below show what people nearby applied for and how the council decided.

235 last 90 days
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63 last 30 days
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43 last 14 days

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Showing 50 of 235 applications
5/2026/1336 2 days ago Pending

20 Warwick Road St Albans AL1 4DL

Proposaed loft conversion and a modest rear dormer and conservation-style rooflights to the front elevation.

PPOR St Albans
5/2026/1331 9 Jul 2026 Pending

1 The Deerings Harpenden Hertfordshire AL5 2PF

Single storey front extension and part retrospective amendments to planning consent ref: 5/25/0584 (Two storey side, front and rear extensions)

PPOR St Albans 9 Jul 2026
5/2026/1332 9 Jul 2026 Pending

50 Woodstock Road North St Albans Hertfordshire AL1 4QF

Construction of one detached three bedroom dwelling with ground floor garden room and new vehicular crossover.

PPOR St Albans 9 Jul 2026
5/2026/1328 9 Jul 2026 Pending

6 Dymoke Green St Albans Hertfordshire AL4 9LY

Proposed rear extension (amendment reduction 5/2025/0755)

PPOR St Albans 9 Jul 2026
5/2026/1326 8 Jul 2026 Pending

9 Field View Rise Bricket Wood Hertfordshire AL2 3RT

***HSE***

PPOR St Albans 8 Jul 2026
5/2026/1308 7 Jul 2026 Pending

19 Carlisle Avenue St Albans Hertfordshire AL3 5LU

***CON***

PPOR St Albans 7 Jul 2026
5/2026/1309 7 Jul 2026 Pending

128 Clarence Road St Albans Hertfordshire AL1 4NW

Single-storey rear infill extension with associated internal alterations, loft conversion incorporating a rear dormer and two front dormers, together ...

PPOR St Albans 7 Jul 2026
5/2026/1310 7 Jul 2026 Pending

20 Aldwick Road Harpenden Hertfordshire AL5 1NG

First floor rear extension with insertion of windows to side elevation

PPOR St Albans 7 Jul 2026
5/2026/1312 7 Jul 2026 Pending

Land Rear Of 50 Lemsford Road St Albans Hertfordshire AL1 3PR

***CON***

PPOR St Albans 7 Jul 2026
5/2026/1311 7 Jul 2026 Pending

95 High Street Colney Heath St Albans Hertfordshire AL4 0NS

Garage extension

PPOR St Albans 7 Jul 2026
5/2026/1313 7 Jul 2026 Pending

84 Five Acres London Colney Hertfordshire AL2 1HX

The proposal seeks to convert the existing integral garage into a fully accessible bedroom & shower room at ground floor level. External Works Removal...

PPOR St Albans 7 Jul 2026
5/2026/1294 6 Jul 2026 Pending

37 Cannon Street St Albans Hertfordshire AL3 5JR

House refurbishment including rear, side and basement extension with new lightwell, roof alterations including small rear dormer and conservation roof...

PPOR St Albans 6 Jul 2026
5/2026/1296 6 Jul 2026 Under Consultation

3 How Field Harpenden Hertfordshire AL5 3AU

Two storey front extension, garage conversion and alterations to openings

HSE St Albans 6 Jul 2026
5/2026/1288 3 Jul 2026 Pending

13 Larch Avenue Bricket Wood Hertfordshire AL2 3SN

Two storey rear extension

PPOR St Albans 3 Jul 2026
5/2026/1289 3 Jul 2026 Pending

8 Rosedale Close Bricket Wood Hertfordshire AL2 3XE

Single storey rear-infill extension to single dwelling house.

PPOR St Albans 3 Jul 2026
5/2026/1291 3 Jul 2026 Pending

13 Gainsborough Avenue St Albans Hertfordshire AL1 4NJ

Single storey wrap around extension both side of house and rear elevation, internal alterations, install solar panels to existing house and annexe in ...

PPOR St Albans 3 Jul 2026
5/2026/1290 3 Jul 2026 Pending

43 White Horse Lane London Colney Hertfordshire AL2 1JP

Loft conversion with dormer windows.

PPOR St Albans 3 Jul 2026
5/2026/1292 3 Jul 2026 Pending

153 Mount Pleasant Lane Bricket Wood Hertfordshire AL2 3XH

New front entrance porch and open-air side canopy structure.

PPOR St Albans 3 Jul 2026
5/2026/1293 3 Jul 2026 Pending

27 Charmouth Road St Albans Hertfordshire AL1 4RS

Demolition of single storey side extension and erection of two storey side and rear extension. Single storey extensions to the rear and replacement ro...

PPOR St Albans 3 Jul 2026
5/2026/1302 3 Jul 2026 Under Consultation

66 Pondfield Crescent St Albans Hertfordshire AL4 9PF

Prior Notification - Single storey rear extension 3m in height x 6m in depth with 2.7m height to eaves

NCS St Albans 3 Jul 2026
5/2026/1271 1 Jul 2026 Pending

10 Newton Close Harpenden Hertfordshire AL5 1SP

Proposed loft extension with rear box dormer and front velux windows. Raised ridge height to dwelling to facilitate required internal floor to ceiling...

PPOR St Albans 1 Jul 2026
5/2026/1270 1 Jul 2026 Pending

22 Liverpool Road St Albans Hertfordshire AL1 3UJ

Single storey side / rear extension.

PPOR St Albans 1 Jul 2026
5/2026/1269 1 Jul 2026 Pending

93 St Peters Street St Albans Hertfordshire

Erection of recessed fourth storey on existing building to provide 4 additional flats following removal of existing mansard plant enclosure.

PPOR St Albans 1 Jul 2026
5/2026/1273 1 Jul 2026 Pending

28 Pipers Avenue Harpenden Hertfordshire AL5 1HB

***HSE***

PPOR St Albans 1 Jul 2026
5/2026/1272 1 Jul 2026 Pending

6 - 8 Ladysmith Road St Albans Hertfordshire AL3 5QA

Joint application - Single storey rear extensions with insertion of doors to rear elevations, rooflights to front and rear roofslopes to facilitate lo...

PPOR St Albans 1 Jul 2026
5/2026/1277 1 Jul 2026 Under Consultation

52 Napsbury Avenue London Colney Hertfordshire AL2 1LS

Certificate of Lawfulness (proposed) - The proposed development comprises building operations associated with the loft conversion of the existing roof...

CLP St Albans 1 Jul 2026
5/2026/1278 1 Jul 2026 Pending

39 Foxcroft St Albans Hertfordshire AL1 5SS

Proposed C3 residential extension includinh two storey front and single storey front and side with internal alterations

PPOR St Albans 1 Jul 2026
5/2026/1280 1 Jul 2026 Pending

441 Luton Road Harpenden Hertfordshire AL5 3QE

Proposed unification of approved new front dormer and Velux to front elevation and 2 no new rear dormer.

PPOR St Albans 1 Jul 2026
5/2026/1279 1 Jul 2026 Pending

12 Mount Drive Park Street St Albans Hertfordshire AL2 2NY

Proposed single storey rear extension with new roof design to accommodate new habitable space within the roof spaces with associated dormers and roofl...

PPOR St Albans 1 Jul 2026
5/2026/1265 30 Jun 2026 Pending

43 Granby Avenue Harpenden Hertfordshire AL5 5QP

Following demolition of store rooms etc, proposed two-storey side and rear extensions, single-storey side and rear extensions along with internal and ...

PPOR St Albans 30 Jun 2026
5/2026/1268 30 Jun 2026 Pending

31 Crouch Hall Gardens Redbourn Hertfordshire AL3 7EL

***HSE***

PPOR St Albans 30 Jun 2026
5/2026/1267 30 Jun 2026 Pending

Wedgewood Hyde East Common Harpenden Hertfordshire AL5 1DD

***HSE***

PPOR St Albans 30 Jun 2026
5/2026/1251 30 Jun 2026 Pending

7 The Broadway Gustard Wood Wheathampstead Hertfordshire AL4 8LW

First floor rear extension to provide for a new bathroom and replace privacy screening to side of existing balcony.

PPOR St Albans 30 Jun 2026
5/2026/1250 30 Jun 2026 Pending

Lamerwood House Codicote Road Wheathampstead Hertfordshire AL4 8GB

Demolition of existing dwelling, removal of hardstanding and various structures and construction of replacement dwelling with basement, separate annex...

PPOR St Albans 30 Jun 2026
5/2026/1249 30 Jun 2026 Pending

53 Offas Way Wheathampstead Hertfordshire AL4 8PB

Creation of a hardstanding within the existing front garden to provide one off street parking space.

PPOR St Albans 30 Jun 2026
5/2026/1248 30 Jun 2026 Pending

St Peters Cottage St Peters Street St Albans Hertfordshire AL1 3EN

Installation of internal secondary glazing to 7 windows on the ground and first floor of the front elevation.

PPOR St Albans 30 Jun 2026
5/2026/1258 30 Jun 2026 Pending

Unit 6 St Albans Retail Park Griffiths Way St Albans Hertfordshire AL1 2RJ

Change of Use from Class A1 (retail) to A3 (restaurant) and alterations to openings

PPOR St Albans 30 Jun 2026
5/2026/1261 30 Jun 2026 Pending

58 Oaklands Lane Smallford St Albans Hertfordshire AL4 0HS

***CON****

PPOR St Albans 30 Jun 2026
5/2026/1260 30 Jun 2026 Pending

58 Oaklands Lane Smallford St Albans Hertfordshire AL4 0HS

Single storey rear and two storey side extension, new front porch, new front dormer window and alterations to openings to the existing dwelling, the s...

PPOR St Albans 30 Jun 2026
5/2026/1263 30 Jun 2026 Pending

1 Lynch Court Sovereign Park St Albans Hertfordshire AL4 0FF

Demolition of existing conservatory and proposed single storey rear extension

PPOR St Albans 30 Jun 2026
5/2026/1264 30 Jun 2026 Pending

12 Long Cutt Redbourn Hertfordshire AL3 7EZ

Proposed single storey rear and first storey side extension with roof lights, along with new openings and internal alterations.

PPOR St Albans 30 Jun 2026
5/2026/1253 29 Jun 2026 Pending

Land Between Datalogic House And Redbourn Recreation Centre Dunstable Road Redbourn Hertfordshire

***NMA***

PPOR St Albans 29 Jun 2026
5/2026/1228 26 Jun 2026 Pending

5 Cunningham Hill Road St Albans Hertfordshire AL1 5BX

Erection of an Orangery with a Basement Beneath

PPOR St Albans 26 Jun 2026
5/2026/1229 26 Jun 2026 Pending

216A Watford Road Chiswell Green St Albans Hertfordshire AL2 3EA

Demolition of outbuildings and single-storey extension, erection of a part single-storey, part two-storey rear extension to the dental surgery and the...

PPOR St Albans 26 Jun 2026
5/2026/1231 26 Jun 2026 Pending

18 Maslen Road St Albans Hertfordshire AL4 0GT

Proposed garage conversion into habitable, remove garage door, brick up and install a window, change existing bow window into a new front bay window t...

PPOR St Albans 26 Jun 2026
5/2026/1232 26 Jun 2026 Pending

11 Grange Court Road Harpenden Hertfordshire AL5 1BY

Demolition of 5 bedroom dwellinghouse and construction of replacement 5 bedroom dwellinghouse with loft accommodation and rear dormer window

PPOR St Albans 26 Jun 2026
5/2026/1233 26 Jun 2026 Pending

7 Ridgmont Road St Albans Hertfordshire AL1 3AG

Single storey rear extension. Alterations to rear elevation.

PPOR St Albans 26 Jun 2026
5/2026/1220 25 Jun 2026 Pending

150 Beech Road St Albans Hertfordshire AL3 5AX

New hardstanding, crossover and dropped kerb. Drop corner kerb (80cm) and next straight kerb (50cm). Restore/repair new access.

PPOR St Albans 25 Jun 2026
5/2026/1218 25 Jun 2026 Pending

Nottlers Lodge Station Road Bricket Wood Hertfordshire AL2 3PD

****CON***

PPOR St Albans 25 Jun 2026
5/2026/1221 25 Jun 2026 Pending

82 Station Road Harpenden Hertfordshire AL5 4TZ

Part two storey, part single storey rear and single storey side extensions

PPOR St Albans 25 Jun 2026
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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 St Albans?
Yes. Click "Set up alerts" on this page and you'll get a daily or weekly email listing every new extensions application published by St Albans. You can also narrow the alert to a postcode, street, or drawn area.

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