House extensions in Harrow

Harrow received 1,859 householder applications in the last 12 months - about 36 a week. Rear extensions and dormers are the most common. Of the 1,504 decided so far, 1,174 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 401 applications
Yesterday Pending Consideration PL/2629/26

20 Greystoke Avenue, North Harrow, Pinner, Harrow, HA5 5SL

Single and two storey side to rear extension with Juliette balcony; Single storey rear extension; External alterations (Demolition of outbuilding to r...

Householder Harrow
Yesterday Pending Consideration PL/2737/26

3 Reynolds Drive, Edgware, Harrow, HA8 5PU

Front porch; Single storey side extension (Demolition of attached garage) (Retrospective)

Householder Harrow
Yesterday Pending Consideration PL/2790/26

4 Mansard Close, Pinner, Harrow, HA5 3FQ

Single storey rear extension; conversion of garage to habitable room with installation of window to front; external alterations

Householder Harrow
24 Oct 2026 Pending Consideration PL/2815/26

11 Secker Crescent, Harrow Weald, Harrow, HA3 5LZ

Single storey rear extension: 4.00 metres deep, 3.40 metres maximum height and 3.00 metres high to the eaves

Prior Notification - Larger Home Extension Harrow
23 Oct 2026 Pending Consideration PL/2809/26

97 Manor Road, Harrow, HA1 2PG

Single storey rear extension: 6.00 metres deep, 3.150 metres maximum height and 3.00 metres high to the eaves

Prior Notification - Larger Home Extension Harrow
23 Oct 2026 Pending Consideration PL/2811/26

87 Welldon Crescent, Harrow, HA1 1QW

Conversion of dwellinghouse into two flats (1 x 2 bed and 1 x 3 bed); new access door to side; separate amenity space; landscaping; bin and cycle stor...

Full Planning Application Harrow
23 Oct 2026 Pending Consideration PL/2814/26

19 Long Elmes, Harrow Weald, Harrow, HA3 5LE

Single storey rear extension: 6.00 metres deep, 3.15 metres maximum height and 3.00 metres high to the eaves

Prior Notification - Larger Home Extension Harrow
23 Oct 2026 Pending Consideration PL/2733/26

3B Bruce Road, Wealdstone, Harrow, HA3 5DZ

Alterations and extension to roof to form end gable and rear dormer; Rooflights to front roof slope; External alterations

Full Planning Application Harrow
22 Oct 2026 Pending Consideration PL/2796/26

28 South Hill Avenue, Harrow, HA2 0NQ

Single storey rear extension: 6.00 metres deep, 4.00 metres maximum height and 2.95 metres high to the eaves

Prior Notification - Larger Home Extension Harrow
22 Oct 2026 Pending Consideration PL/2668/26

3A Bruce Road, Wealdstone, Harrow, HA3 5DZ

Single storey rear extension (Demolition of rear extension)

Full Planning Application Harrow
22 Oct 2026 Pending Consideration PL/2690/26

30 Liberty House, Classic Cars Uk Ltd Whitchurch Lane, Edgware, HA8 6LE

Replacement entrance doors in front elevation; Installation of new entrance door to front elevation; Installation of decorative grille to front elevat...

Full Planning Application Harrow
22 Oct 2026 Pending Consideration PL/2787/26

10 Shooters Avenue, Kenton, Harrow, HA3 9BG

Single storey rear extension: 6.00 metres deep, 3.69 metres maximum height and 3.00 metres high to the eaves

Prior Notification - Larger Home Extension Harrow
21 Oct 2026 Pending Consideration PL/2789/26

78 Spencer Road, Wealdstone, Harrow, HA3 7AR

Conversion of dwelling into three flats (1 X Studio, 1 x 1 bed & 1 X 3 bed); Single storey rear extensions; Single an two storey side extension; Alter...

Full Planning Application Harrow
21 Oct 2026 Pending Consideration PL/2773/26

28 Cuckoo Hill Drive, Pinner, Harrow, HA5 3PJ

Single story front extension incorporating porch; First floor rear extension; Alterations to roof to raise ridge height and form a rear dormer; Extern...

Householder Harrow
21 Oct 2026 Pending Consideration PL/2786/26

3 Silverston Way, Stanmore, Harrow, HA7 4HS

Single storey rear extension: 6.00 metres deep, 3.20 metres maximum height and 3.00 metres high to the eaves

Prior Notification - Larger Home Extension Harrow
21 Oct 2026 Pending Consideration PL/2606/26

34 Constable Gardens, Edgware, Harrow, HA8 5SA

Single storey side extension; external alterations

Householder Harrow
20 Oct 2026 Pending Consideration PL/2766/26

14 Downs Avenue, Pinner, Harrow, HA5 5AH

Certificate of lawful development (proposed): Alterations to roof to form wrap around dormer to side, rear and side roof slopes with part pitch to gab...

Certificate of Lawful Development Proposed Harrow
20 Oct 2026 Pending Consideration PL/2778/26

10 Cheltenham Place, Kenton, Harrow, HA3 9ND

Single storey rear extension: 6.00 metres deep, 3.00 metres maximum height and 2.75 metres high to the eaves

Prior Notification - Larger Home Extension Harrow
20 Oct 2026 Pending Consideration PL/2782/26

51 Albury Drive, Pinner, Harrow, HA5 3RL

Single storey rear extension: 6.00 metres deep, 3.00 metres maximum height and 2.70 metres high to the eaves

Prior Notification - Larger Home Extension Harrow
20 Oct 2026 Pending Consideration PL/2774/26

36 Howberry Road, Edgware, Harrow, HA8 6ST

Single storey rear extension; conversion of garage to habitable room with installation of window to front; external alterations

Householder Harrow
20 Oct 2026 Pending Consideration PL/2781/26

21 Pinner Park Gardens, Harrow, HA2 6LQ

Single storey side extension; external alterations

Householder Harrow
20 Oct 2026 Pending Consideration PL/2732/26

Colaz, 464 Alexandra Avenue, Rayners Lane, Harrow, HA2 9TL

New shop font including outdoor seating area with stairs and ramp (part retrospective)

Full Planning Application Harrow
20 Oct 2026 Pending Consideration PL/2751/26

89 Elm Drive, North Harrow, Harrow, HA2 7BY

Single storey front to side extension (Demolition of attached garage)

Householder Harrow
20 Oct 2026 Pending Consideration PL/2291/26

Flat 1, 72 Morley Crescent East, Stanmore, Harrow, HA7 2LQ

Single storey rear conservatory extension; external alterations; out building at rear for use incidental to main dwelling (retrospective)

Full Planning Application Harrow
20 Oct 2026 Pending Consideration PL/2752/26

91 Elm Drive, North Harrow, Harrow, HA2 7BY

Single storey front, side and rear extension incorporating porch; external alterations (demolition of attached garage)

Householder Harrow
20 Oct 2026 Pending Consideration PL/2740/26

24 Grange Gardens, Pinner, Harrow, HA5 5QE

Relocation of entrance door in front elevation; Single storey front infill extension; Repacement window in ground floor front elevation; Single storey...

Householder Harrow
20 Oct 2026 Pending Consideration PL/2742/26

97 Village Way, Rayners Lane, Pinner, Harrow, HA5 5AA

Certificate of lawful development (proposed): Rear dormer

Certificate of Lawful Development Proposed Harrow
20 Oct 2026 Pending Consideration PL/2745/26

36 Cuckoo Hill Road, Pinner, Harrow, HA5 1AY

Proposed single-storey front, side and rear extension, first-floor side and rear extension, rear dormer including rooflights to front, side and rear r...

Householder Harrow
19 Oct 2026 Pending Consideration PL/2753/26

GUNFLEET South View Road, Pinner, Harrow, HA5 3XZ

Single storey front extension; part conversion of garage into habitable room; single storey side extension; external alterations

Householder Harrow
19 Oct 2026 Pending Consideration PL/2062/26

THE SLOES Potter Street Hill, Pinner, Harrow, HA5 3YH

Widening of existing garage door opening and provision of bifold doors in enlarged opening; construction of carport; construction of enclosed verandah...

Householder Harrow
19 Oct 2026 Pending Consideration PL/2672/26

PRIDEVIEW PLACE, 43 Church Road, Stanmore, Harrow

Construction of an additional storey to create four residential flats with associated amenity space and bin and cycle storage, and reconfiguration of ...

Full Planning Application Harrow
19 Oct 2026 Pending Consideration PL/2756/26

Stuart Road, 5 Stuart Road, Wealdstone, Harrow, HA3 7RF

Change of use and regularisation of residential use of the rear ground-floor accommodation to provide one self-contained one-bedroom residential flat ...

Full Planning Application Harrow
19 Oct 2026 Pending Consideration PL/2765/26

74 Woodberry Avenue, Harrow, HA2 6AX

Single storey side extension; external alterations (demolition of existing side extensions)

Householder Harrow
19 Oct 2026 Pending Consideration PL/2768/26

12 Tithe Farm Avenue, South Harrow, Harrow, HA2 9AE

Single storey front extension incorporating porch; conversion of garage to habitable room; external alterations

Householder Harrow
19 Oct 2026 Pending Consideration PL/2599/26

13 Little Common, Stanmore, Harrow, HA7 3BZ

Replacement fence to side; Replacement pedestrian gate to front (Part retrospective)

Full Planning Application Harrow
19 Oct 2026 Pending Consideration PL/2712/26

13 Woodberry Avenue, Harrow, HA2 6AU

Certificate of Lawful Proposed Development: Replacement entrance door in front elevation; Conversion of garage to habitable room; Replace garage door ...

Certificate of Lawful Development Proposed Harrow
19 Oct 2026 Pending Consideration PL/2755/26

72 South Hill Avenue, South Harrow, Harrow, HA2 0NH

Certificate of Lawful Proposed Development: Use of outbuilding at rear as granny annexe ancllary to the main dwelling; Replacement doors and windows; ...

Certificate of Lawful Development Proposed Harrow
19 Oct 2026 Pending Consideration PL/2764/26

78 Spencer Road, Wealdstone, Harrow, HA3 7AR

Conversion of dwelling into three flats (1 X Studio, 1 x 1 bed & 1 X 3 bed); Single storey rear extensions; Single and two storey side extension; Alte...

Full Planning Application Harrow
19 Oct 2026 Pending Consideration PL/2767/26

114 Kings Road, South Harrow, Harrow, HA2 9JH

First floor side extension; External alterations

Householder Harrow
18 Oct 2026 Pending Consideration PL/2748/26

64 Romney Close, North Harrow, Harrow, HA2 7EH

Single storey rear extension: 6.00 metres deep, 3.95 metres maximum height and 2.86 metres high to the eaves

Prior Notification - Larger Home Extension Harrow
16 Oct 2026 Pending Consideration PL/2749/26

6 Kenmore Road, Kenton, Harrow, HA3 9EL

Alterations to roof; rear dormer with Juliette balcony; installation of rooflights in front and side roof slopes; external alterations

Householder Harrow
16 Oct 2026 Pending Consideration PL/2736/26

275 Kenmore Avenue, Kenton, Harrow, HA3 8PD

Single storey rear extension: 6.00 metres deep, 3.82 metres maximum height and 2.92 metres high to the eaves

Prior Notification - Larger Home Extension Harrow
15 Oct 2026 Pending Consideration PL/2725/26

93B High Street, Wealdstone, Harrow, HA3 5DL

Conversion of second floor flat into two flats (1 x 1 bed & 1 x 2 beds); alterations and extension to roof to form end gable; rear dormer; external al...

Full Planning Application Harrow
15 Oct 2026 Pending Consideration PL/2728/26

2 Buckland Rise, Pinner, Harrow, HA5 3QR

Erection of a single- and double-storey side-to-rear extension with rooflights, internal alterations, and demolition of the existing garage and lean-t...

Householder Harrow
15 Oct 2026 Pending Consideration PL/2660/26

71 Kingshill Avenue, Kenton, Harrow, HA3 8LA

Single and two storey side to rear extension; external alterations (demolition of side extension and conservatory)

Householder Harrow
15 Oct 2026 Pending Consideration PL/2679/26

23 Chartley Avenue, Stanmore, Harrow, HA7 3RA

Single storey rear extension; alterations and extension to roof to form end gable; rear dormer; rooflight in front roof slope; window in end gable; ex...

Householder Harrow
14 Oct 2026 Pending Consideration PL/2722/26

20 Oakington Avenue, Rayners Lane, Harrow, HA2 7JJ

Single storey rear extension: 8.00 metres deep, 4.00 metres maximum height and 3.00 metres high to the eaves

Prior Notification - Larger Home Extension Harrow
14 Oct 2026 Pending Consideration PL/2723/26

28 Fernbrook Drive, North Harrow, Harrow, HA2 7EB

Single storey rear extension: 4.00 metres deep, 3.40 metres maximum height and 3.00 metres high to the eaves

Prior Notification - Larger Home Extension Harrow
14 Oct 2026 Pending Consideration PL/2719/26

20 Queens Avenue, Stanmore, Harrow, HA7 2LF

Certificate of Lawful Proposed Development: Single storey detached outbuilding at rear for use as Gym/Office/Storage

Certificate of Lawful Development Proposed Harrow
14 Oct 2026 Pending Consideration PL/2698/26

346 Pinner Road, North Harrow, Harrow

Part change of use of studio flat (Class C3) to extend retail unit (Class E) on ground floor; single, two and three storey rear extensions to create t...

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

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