House extensions in St Albans

St Albans received 1,144 householder applications in the last 12 months - about 22 a week. Rear extensions and garage works are the most common. Of the 666 decided so far, 569 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 252 applications
22 Oct 2026 Pending Consideration 26/1837/HSE

32 Waverley Road St Albans Hertfordshire AL3 5PE

Demolition of existing garage and construction of a replacement outbuilding, construction of single storey side extension and alterations to openings,...

Householder St Albans
20 Oct 2026 Pending Consideration 26/1875/PAO

Turners Hall Farm Annables Lane Kinsbourne Green Harpenden Hertfordshire AL5 3PT

Prior Approval - Enlargement of the existing two storey dwelling house consisting of the construction of one additional storey immediately above the t...

Prior Approval Other St Albans
20 Oct 2026 Pending Consideration 26/1846/HSE

30 Dale Avenue Gustard Wood Wheathampstead Hertfordshire AL4 8LS

Side and rear extension, conversion of garage into additional storage at front and habitable space at rear, with replacement and new windows, demoliti...

Householder St Albans
16 Oct 2026 Pending Consideration 26/1827/HSE

2 Wordsworth Road Harpenden Hertfordshire AL5 4AF

Demolition of two outbuildings and construction of a new single storey extension and associated landscaping works

Householder St Albans
16 Oct 2026 Pending Consideration 26/1813/HSE

266 London Road St Albans Hertfordshire AL1 1HY

Demolition of the existing conservatory and erection of a single storey rear extension and pergola with a raised patio and steps

Householder St Albans
15 Oct 2026 Pending Consideration 26/1845/HSE

15 Kirkwick Avenue Harpenden Hertfordshire AL5 2QU

Replacement garage doors, internal alterations, and a replacement window

Householder St Albans
14 Oct 2026 Pending Consideration 26/1853/HSE

36 Lords Meadow Redbourn Hertfordshire AL3 7BX

Two storey side extension, single storey front, side and rear extension following demolition of detached garage, raising of roof to facilitate loft co...

Householder St Albans
14 Oct 2026 Pending Consideration 26/1850/HSE

3 Netherfield Road Harpenden Hertfordshire AL5 2AF

The proposed development comprises the construction of a single-storey, detached garden building within the rear garden of the existing residential pr...

Householder St Albans
14 Oct 2026 Pending Consideration 26/1830/HSE

132 Gurney Court Road St Albans Hertfordshire AL1 4RJ

Two storey side and part two storey, part single storey rear extension following demolition of existing garage and green house, roof extension involvi...

Householder St Albans
14 Oct 2026 Pending Consideration 26/1851/HSE

56 Barnfield Road Harpenden Hertfordshire AL5 5TQ

Rear First Floor Extension Over Ground Floor Single Storey Extension Plus Raising Of Existing Single Storey Ridge & Minor Works To Front

Householder St Albans
14 Oct 2026 Pending Consideration 26/1855/PAHSE

9 St Albans Road Sandridge Hertfordshire AL4 9LA

Prior Notification - Single storey rear extension 3.2m in height x 8m in depth with 1.58m height to eaves

Prior Approval Householder St Albans
14 Oct 2026 Pending Consideration 26/1823/HSE

31 King Harry Lane St Albans Hertfordshire AL3 4AS

Part two storey front and rear extension. Part single storey rear extension. Alterations to existing front roof. Addition of porch roof. Alterations t...

Householder St Albans
13 Oct 2026 Pending Consideration 26/1842/HSE

144 Cravells Road Harpenden Hertfordshire AL5 1BQ

Single storey side extension. First floor rear extension. Alterations to rear facade and roofline.

Householder St Albans
13 Oct 2026 Pending Consideration 26/1844/HSE

52 Cravells Road Harpenden Hertfordshire AL5 1BD

Rear first floor extension and rear single storey extension. Installation of roof-lights.

Householder St Albans
13 Oct 2026 Pending Consideration 26/1817/HSE

96 Gurney Court Road St Albans Hertfordshire AL1 4RJ

Proposed first-floor rear extension over flat roof to existing ground floor extension.

Householder St Albans
12 Oct 2026 Pending Consideration 26/1849/HSE

8 Collyer Road London Colney Hertfordshire AL2 1PD

Single storey front, side and rear extension

Householder St Albans
12 Oct 2026 Pending Consideration 26/1815/HSE

47 Westfield Road Harpenden Hertfordshire AL5 4HR

Single storey rear extension (Retrospective)

Householder St Albans
10 Oct 2026 Pending Consideration 26/1834/HSE

32 Liverpool Road St Albans Hertfordshire AL1 3UJ

Loft conversion with rear dormer and front rooflights, replacement front windows & ground floor side window

Householder St Albans
9 Oct 2026 Approved 16 Oct 26/1819/CLP

32 Stanhope Road St Albans Hertfordshire AL1 5BL

Certificate of Lawfulness (Proposed) - Insertion of side window

Certificate of Lawfulness Proposed St Albans
8 Oct 2026 Pending Consideration 26/1814/HSE

22 Willoughby Road Harpenden Hertfordshire AL5 4PF

Proposed single storey rear (infill) extension

Householder St Albans
8 Oct 2026 Pending Consideration 26/1808/HSE

68 Ragged Hall Lane Chiswell Green St Albans Hertfordshire AL2 3LD

Single storey front and rear extension

Householder St Albans
7 Oct 2026 Pending Consideration 26/1821/HSE

40 Lattimore Road Wheathampstead Hertfordshire AL4 8QE

Demolition of the existing garage and conservatory, erection of a single-storey rear extension and a new garage, installation of a garage door to the ...

Householder St Albans
7 Oct 2026 Pending Consideration 26/1822/HSE

16 Camlet Way St Albans Hertfordshire AL3 4TL

Demolition of existing single storey side extension, separate garage and shed. Proposed rear single storey side and rear extension. Alterations to rea...

Householder St Albans
6 Oct 2026 Pending Consideration 26/1820/HSE

20 Crouch Hall Lane Redbourn Hertfordshire AL3 7EQ

Garage conversion to habitable room & alterations to openings

Householder St Albans
5 Oct 2026 Pending 5/2026/1795

32 Briar Road St Albans AL4 9TL

Demolition of existing rear conservatory and erection of proposed single storey rear extension and erection of new front entrance porch and developmen...

PPOR St Albans
5 Oct 2026 Pending 5/2026/1796

1 Hitherfield Lane Harpenden AL5 4JD

Proposal: Construction of a single storey orangery and garden store extension with a hipped tiled roof, Velux roof lights and casement doors and windo...

PPOR St Albans
5 Oct 2026 Pending 5/2026/1798

42 A West Common Harpenden AL5 2JW

Proposed demolition of garage and re build of first floor raising the roof with extension to the south elevation and internal alterations

PPOR St Albans
5 Oct 2026 Pending Consideration 5/2026/1576

9 Cambridge Road St Albans Hertfordshire AL1 5LH

Raising the gables to provide height for a loft conversion

PPOR St Albans
5 Oct 2026 Pending Consideration 5/2026/1501

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
2 Oct 2026 Pending 5/2026/1790

1- 14 Ditchling Court St Albans Hertfordshire AL1 3LQ

Changing all the windows on a two blocks of flats numbers 1 to 14 including all communal windows . Current material is timber which is rotting circa 2...

PPOR St Albans
2 Oct 2026 Pending 5/2026/1789

81 Drakes Drive St Albans Hertfordshire AL1 5AQ

Construction of a new dropped kerb to provide vehicular access between the public highway and the existing driveway serving the property.

PPOR St Albans
2 Oct 2026 Pending Consideration 5/2026/1699

48 Brampton Road St Albans Hertfordshire AL1 4PT

Proposed single storey rear extension and alterations , with extension to side of rear projection

PPOR St Albans
2 Oct 2026 Pending Consideration 5/2026/1629

103 Gurney Court Road St Albans Hertfordshire AL1 4QX

Front porch and wc, single storey rear extension, remove render to rear first floor out rigger rear elevation and clad with Cedral

PPOR St Albans
1 Oct 2026 Pending 5/2026/1785

26 Mobile Home Site Drakes Drive St Albans Hertfordshire AL1 5AE

Installation of step lift to provide safe access to mobile home

PPOR St Albans
1 Oct 2026 Pending 5/2026/1783

25 Foxcroft St Albans Hertfordshire AL1 5SW

Ground floor front extension, together with ground and first floor side and rear extensions to the house.

PPOR St Albans
1 Oct 2026 Pending 5/2026/1781

19 Saberton Close Redbourn Hertfordshire AL3 7DS

***CON***

PPOR St Albans
1 Oct 2026 Pending 5/2026/1782

45 The Park Redbourn Hertfordshire AL3 7LR

Single storey front infill extension with pitched roof. Garage conversion into habitable accommodation. Velux windows to front roof slope. Demolition ...

PPOR St Albans
1 Oct 2026 Pending Consideration 5/2026/1578

30 Gurney Court Road St Albans Hertfordshire AL1 4RL

Demolition of Existing Out House, Ground Floor Rear Extension and First Floor Side and Rear Extension

PPOR St Albans
30 Sept 2026 Pending 5/2026/1780

12 Avenue St Nicholas Harpenden Hertfordshire AL5 2BX

Rear roof extension comprising 3 related dormers

PPOR St Albans
30 Sept 2026 Pending 5/2026/1778

87 How Wood Park Street St Albans Hertfordshire AL2 2RW

First floor side extension to existing two storey semi-detached dwelling house: Roof line, scale and materiality - Continuation to match existing hous...

PPOR St Albans
30 Sept 2026 Pending 5/2026/1779

25 Osprey Drive St Albans Hertfordshire AL4 0LT

Two Storey Rear Extension

PPOR St Albans
30 Sept 2026 Pending 5/2026/1775

32 West Way Harpenden Hertfordshire AL5 4RD

Part single storey, part two storey side and rear extension, new hipped crown roof and loft conversion with roof lights and dormer, new front bay wind...

PPOR St Albans
30 Sept 2026 Pending Consideration 5/2026/1772

14 Ashley Road St Albans Hertfordshire AL1 5DA

Certificate of Lawfulness (Proposed) - Loft Conversion, Hip to gable, Rear dormer

CLP St Albans
30 Sept 2026 Pending Consideration 5/2026/1444

25 Mile House Lane St Albans Hertfordshire AL1 1TF

Single storey side extension, two storey side extension following demolition of existing single storey side projection, new access ramp to main entran...

PPOR St Albans
29 Sept 2026 Pending Consideration 5/2026/1777

66 Pondfield Crescent St Albans Hertfordshire AL4 9PF

Prior Notification - Single storey rear extension 3.0m in height x 6.0m in depth with 2.70m height to eaves

NCS St Albans
29 Sept 2026 Pending 5/2026/1774

16 Lea Road Harpenden Hertfordshire AL5 4PG

Demolition of existing conservatory and erection of single-storey rear extension and proposed pitched roof rear dormer to existing loft conversion

PPOR St Albans
29 Sept 2026 Pending 5/2026/1769

59 Marshals Drive St Albans Hertfordshire AL1 4RD

Demolition of conservatory and construction of single storey rear extension with basement room, part single, part two storey front extension with dorm...

PPOR St Albans
29 Sept 2026 Pending 5/2026/1766

4 Grange Court Road Harpenden Hertfordshire AL5 1BY

The construction of a new single-storey rear extension, two single-storey first floor side extensions, new garage and a loft conversion. With demoliti...

PPOR St Albans
29 Sept 2026 Pending 5/2026/1765

61 Ambrose Lane Harpenden Hertfordshire AL5 4BU

Proposed two and single storey rear extensions, single storey front extension and entrance canopy and new garden gate and brick wall

PPOR St Albans
29 Sept 2026 Pending 5/2026/1764

Odyssey Cinema 166 London Road St Albans Hertfordshire AL1 1PQ

Full planning permission to replace existing entrance doors and install new panelling, refurbish and install a new feature lightbox to the underside o...

PPOR St Albans
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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 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.