House extensions in St Albans

St Albans received 914 householder applications in the last 12 months - about 18 a week. Rear extensions and garage works are the most common. Of the 414 decided so far, 342 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 259 applications
Yesterday Pending 5/2026/1675

10 Ennerdale Close St Albans AL1 5QA

Rear summer house and new porch to front of house

PPOR St Albans
Yesterday Pending 5/2026/1674

80 A Morton House Victoria Street St Albans AL1 3XH

Proposed Conversion of Existing Roof Space to Create One One-Bedroom Apartment, Including the Installation of Three Conservation Rooflights to the Fro...

PPOR St Albans
Yesterday Pending 5/2026/1671

4 The White Hart Tap Ph Keyfield Terrace St Albans AL1 1QJ

Enhancements to the existing garden and front external areas of the White Hart Tap, including the introduction of a new timber pergola with integrated...

PPOR St Albans
Yesterday Pending 5/2026/1672

80 Osprey Drive St Albans AL4 0LU

Single storey side/rear extension with alterations to rear opening

PPOR St Albans
Yesterday Pending 5/2026/1669

10 Bridle Close St Albans AL3 5HX

Conversion of existing garage to internal accommodation

PPOR St Albans
Yesterday Pending 5/2026/1668

3 Swans Close St Albans AL4 0TL

Single storey rear extension, raising of ridge height & rear dormer loft conversion

PPOR St Albans
Yesterday Pending 5/2026/1661

94 London Road St Albans AL1 1NX

Erection of a 2.0m timber rear boundary fence, change of use of part of the car park to restaurant ancillary space, erection of external walk-in fridg...

PPOR St Albans
Yesterday Pending 5/2026/1663

1A & 1B Harpenden Rise Harpenden AL5 3BG

Proposed side extension of existing dwellings to create new two-storey dwelling including roof-mounted solar panels and air source heat pump with asso...

PPOR St Albans
Yesterday Pending 5/2026/1664

69 Dalton Street St Albans AL3 5QH

Proposed single storey side rear infill, small rear dormer to existing converted loft and internal alterations.

PPOR St Albans
Yesterday Pending 5/2026/1665

12 Jameson Road Harpenden AL5 4HQ

Two and a half storey side extension, single storey front and rear extensions, internal alterations and demolition of existing double garage within re...

PPOR St Albans
2 days ago Pending 5/2026/1659

60 Verulam Road St Albans AL3 4DH

Two storey rear and single storey side and rear extensions, removal of chimney, front facing rooflight and alteration to openings.

PPOR St Albans
8 Sept 2026 Pending 5/2026/1658

39 Beverley Gardens St Albans AL4 9BJ

First floor side extension.

PPOR St Albans
8 Sept 2026 Pending 5/2026/1654

25 The White House West Riding Bricket Wood AL2 3QS

A retrospective application for a single-storey garden outbuilding (summerhouse) located within the rear garden of the dwelling at???25???West???Ridin...

PPOR St Albans
8 Sept 2026 Pending 5/2026/1647

43 Wilstone Drive St Albans AL4 9TT

Replace a conservatory with an extension, part conversion of the garage and first floor side extension.

PPOR St Albans
4 Sept 2026 Under Consultation 5/2026/1609

36 Battlefield Road St Albans Hertfordshire AL1 4DD

Non Material Amendment - Removal of a chimney stack and a first floor side window, an additional rooflight has been added to the front elevation and t...

NMA St Albans
3 Sept 2026 Pending 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
3 Sept 2026 Pending 5/2026/1630

Bury Farm Cottage 53 Ash Grove Wheathampstead Hertfordshire AL4 8DF

***LBC***PP15153375

PPOR St Albans
3 Sept 2026 Pending 5/2026/1631

3 Ashcroft Close Harpenden Hertfordshire AL5 1JJ

Single storey side and rear extensions, loft conversion incorporating a raised roof, rooflights and solar panels, replacement windows, alterations to ...

PPOR St Albans
3 Sept 2026 Pending 5/2026/1632

1 Abbey Avenue St Albans Hertfordshire AL3 4BJ

Proposed two-storey rear extension and part single-storey rear extension.

PPOR St Albans
3 Sept 2026 Pending 5/2026/1628

15 Miley Close Harpenden Hertfordshire AL5 3DS

Single storey rear extension

PPOR St Albans
3 Sept 2026 Pending 5/2026/1625

72 Crabtree Lane Harpenden Hertfordshire AL5 5NS

rear orangery

PPOR St Albans
2 Sept 2026 Pending 5/2026/1618

73 Cravells Road Harpenden Hertfordshire AL5 1BH

Single storey rear extension

PPOR St Albans
2 Sept 2026 Pending 5/2026/1614

3 Corby Close Chiswell Green St Albans Hertfordshire AL2 3BB

Proposed front and side addition to the ground floor and first floor storey with internal alterations to the layout. Porch to the front elevation.

PPOR St Albans
2 Sept 2026 Pending 5/2026/1615

87 Luton Road Harpenden Hertfordshire AL5 3BA

single storey side and rear extension with internal amendments

PPOR St Albans
1 Sept 2026 Pending 5/2026/1612

79 Caesars Road Wheathampstead Hertfordshire AL4 8PA

Demolition of existing garage. Proposed single storey front extension and single storey side extension pitched roofs, front rain porch and alterations...

PPOR St Albans
1 Sept 2026 Pending 5/2026/1610

31 Hornbeams Bricket Wood Hertfordshire AL2 3SP

Loft Conversion

PPOR St Albans
1 Sept 2026 Pending 5/2026/1608

46 Church End Redbourn Hertfordshire AL3 7DU

***LBC***PP15159101

PPOR St Albans
29 Aug 2026 Pending 5/2026/1604

6 The Mews Breadcroft Lane Harpenden Hertfordshire AL5 4TF

Garage conversion with new window

PPOR St Albans
28 Aug 2026 Pending 5/2026/1601

87 Marshals Drive St Albans Hertfordshire AL1 4RD

Double storey side extension and addition of large picture windows and changes to external materials.

PPOR St Albans
28 Aug 2026 Pending 5/2026/1598

39 Grove Avenue Harpenden Hertfordshire AL5 1EY

Single storey side extension and alterations to fenestration.

PPOR St Albans
27 Aug 2026 Pending 5/2026/1595

23 Osprey Drive St Albans Hertfordshire AL4 0LT

The construction of a single storey front porch at 23 Osprey Drive, St Albans.

PPOR St Albans
27 Aug 2026 Pending 5/2026/1594

54 Church End Redbourn Hertfordshire AL3 7DU

***LBC***PP15188570

PPOR St Albans
27 Aug 2026 Pending 5/2026/1592

525 Watford Road Chiswell Green St Albans Hertfordshire AL2 3DU

Installation of two number rear - side elevation dormers

PPOR St Albans
26 Aug 2026 Pending 5/2026/1591

78 Prospect Road St Albans Hertfordshire AL1 2BA

Single storey side and rear extension

PPOR St Albans
26 Aug 2026 Pending 5/2026/1587

Abbey View Golf & Track Facility Athletics Track Westminster Lodge Holywell Hill St Albans Hertfordshire AL1 2DJ

***CON***

PPOR St Albans
26 Aug 2026 Pending 5/2026/1585

34 Vanda Crescent St Albans Hertfordshire AL1 5EX

Loft conversion, Hip to gable and rear dormer.

PPOR St Albans
26 Aug 2026 Pending 5/2026/1583

42 Luton Road Harpenden Hertfordshire AL5 2UJ

3m deep, single storey rear extension plus introduction of side door to the existing garage

PPOR St Albans
26 Aug 2026 Pending 5/2026/1584

Prae Wood Farm Barn Hemel Hempstead Road St Albans Hertfordshire AL1 6AA

Re-roof existing building including provision of additional insulation

PPOR St Albans
26 Aug 2026 Pending 5/2026/1581

37 Orient Close St Albans Hertfordshire AL1 1AJ

Proposed garage conversion into habitable, brick up and replace garage door with a window, change rear garage door into window with breakthrough from ...

PPOR St Albans
25 Aug 2026 Pending 5/2026/1580

106 Puddingstone Drive St Albans Hertfordshire AL4 0GY

Proposed single stoey rear extension

PPOR St Albans
25 Aug 2026 Pending 5/2026/1578

30 Gurney Court Road St Albans Hertfordshire AL1 4RL

1. Demolition of Existing Out House 2. Ground Floor Rear Extension 3. First Floor Side and Rear Extension

PPOR St Albans
25 Aug 2026 Pending 5/2026/1576

9 Cambridge Road St Albans Hertfordshire AL1 5LH

Raising the gables to provide height for a loft conversion

PPOR St Albans
24 Aug 2026 Pending 5/2026/1571

10 Albert Street St Albans Hertfordshire AL1 1RU

Alterations to front entrance; rear extension at lower and upper ground floor level; rear dormer roof extension; pitched roof windows to front roof sl...

PPOR St Albans
24 Aug 2026 Pending 5/2026/1572

25 Sheppards Close St Albans Hertfordshire AL3 5AL

Single storey wrap around extension, internal alterations & all associated works

PPOR St Albans
24 Aug 2026 Pending 5/2026/1573

40 Beechwood Avenue St Albans Hertfordshire AL1 4YA

Hip to gable roof side extension; Widen and enlarge existing rear box dormer;

PPOR St Albans
24 Aug 2026 Pending 5/2026/1574

The Three Horseshoes East Common Harpenden Hertfordshire AL5 1AW

Partial demolition, extension and alteration of existing dwelling, and demolition of existing garage and erection of new annex on its footprint.

PPOR St Albans
24 Aug 2026 Pending 5/2026/1569

114 Old London Road St Albans Hertfordshire AL1 1PU

A lightweight rear glass extension that infills the existing rear elements of the property creating a glazed area to accommodate a new stair to replac...

PPOR St Albans
21 Aug 2026 Pending 5/2026/1562

26 Camp Road St Albans Hertfordshire AL1 5DY

Proposed ground and first floor rear extension, inclusion of a rear dormer and alterations to openings and associated works. Front garden renovated in...

PPOR St Albans
21 Aug 2026 Pending 5/2026/1564

1 Poynings Close Harpenden Hertfordshire AL5 1JD

two-storey and part single-storey rear extensions, side extensions, a two-storey front extension incorporating a projecting glazed gable feature, and ...

PPOR St Albans
21 Aug 2026 Approved 5/2026/1558

31 Highfield Avenue Harpenden Hertfordshire AL5 5UB

Certificate of Lawfulness ( Proposed) - Proposed rear single-storey extension, side single-storey extension and removal of rear chimney stack

CLP 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.