House extensions in Harrow

Harrow received 1,273 householder applications in the last 12 months - about 24 a week. Rear extensions and dormers are the most common. Of the 456 decided so far, 346 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 424 applications
Today Pending PL/1717/26

86 Canning Road, Wealdstone, Harrow

Single storey rear infill extensions; rear dormer

Full Planning Application Harrow
Today Pending PL/2117/26

27 Royston Park Road, Hatch End, Pinner, Harrow, HA5 4AA

Front entrance canopy; first floor front extension with bay windows; single and two storey side to rear extensions; attached garage; side dormer; roof...

Householder Harrow
Today Pending PL/2104/26

. 56 & 58 Ladycroft Walk, Stanmore, HA7 1PE

Single storey front extension incorporating front porch; single and two storey side to rear extension; single storey rear extension; external alterati...

Householder Harrow
Today Pending PL/2156/26

7 Sweetmans Avenue, Pinner, Harrow, HA5 3NS

Certificate Of Lawful Development (Proposed): Alterations and extension to roof to form end gables to both sides; rear dormer; four roof lights in fro...

Certificate of Lawful Development Proposed Harrow
Today Pending PL/2172/26

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
Today Pending PL/1373/26

28 Butler Road, West Harrow, Harrow, HA1 4DR

Single storey rear extension permitting internal changes to the ground floor flat and external alterations

Full Planning Application Harrow
Today Pending PL/2145/26

66 Marsh Road, Pinner, Harrow, HA5 5NQ

Two storey side extension; single storey side to rear extension; external alterations (Demolition of detached garage)

Householder Harrow
Today Pending PL/2153/26

12 Rees Drive, Stanmore, Harrow, HA7 4YN

Front porch (Retrospective)

Householder Harrow
Today Pending PL/2260/26

25 Hide Road, Harrow, HA1 4SG

Wrap around rear dormer; two roof lights in front roof slope; windows to side and rear

Full Planning Application Harrow
Today Pending PL/2381/26

24 Leamington Crescent, South Harrow, Harrow, HA2 9HQ

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

Prior Notification - Larger Home Extension Harrow
Today Pending PL/1655/26

7A Village Way East, Rayners Lane, Harrow, HA2 7LX

Rear dormer; installation of two roof lights in front roof slope

Full Planning Application Harrow
Today Pending PL/2264/26

12 Barn Crescent, Stanmore, Harrow, HA7 2RY

Single and two storey side and rear extensions; external alterations

Householder Harrow
Today Pending PL/2354/26

27 Mead Road, Edgware, Harrow, HA8 6LH

Single storey rear extension

Householder Harrow
Today Pending PL/2384/26

11 Central Avenue, Pinner, Harrow, HA5 5BT

Certificate of lawful development (proposed): Rear dormer; installation of rooflight to each side and rear roof slopes

Certificate of Lawful Development Proposed Harrow
Yesterday Pending PL/2360/26

99 Kings Road, South Harrow, Harrow, HA2 9LD

Single storey rear extension: 4.00 metres deep, 3.295 metres maximum height and 3.00 metres high to the eaves

Prior Notification - Larger Home Extension Harrow
Yesterday Pending PL/2373/26

22 Formby Avenue, Kenton, Stanmore, Harrow, HA7 2JZ

Single storey rear extension: 6.00 metres deep, 3.05 metres maximum height and 2.90 metres high to the eaves

Prior Notification - Larger Home Extension Harrow
Yesterday Pending PL/2171/26

3 Monro Gardens, Harrow Weald, Harrow, HA3 6HH

Single storey side to rear extension (demolition of garage and shed)

Householder Harrow
Yesterday Pending PL/2326/26

24 Cloyster Wood, Stanmore, Edgware, Harrow, HA8 6RS

Single storey side and rear extensions (Part demolition of attached garage, side and rear extensions)

Householder Harrow
Yesterday Pending PL/2332/26

90 Parkside Way, North Harrow, Harrow, HA2 6DG

Certificate of lawful development (proposed): Alterations to roof to form end gable and rear dormer; single storey outbuilding in rear garden

Certificate of Lawful Development Proposed Harrow
Yesterday Pending PL/2348/26

44 Lansdowne Road, Stanmore, Harrow, HA7 2SA

Single storey rear and side extension, first floor side and rear extension, roof extension with side and rear dormer; front porch; external alteration...

Householder Harrow
Yesterday Pending PL/2369/26

25 Hibbert Road, Harrow Weald, Harrow, HA3 7JU

Certificate of lawful development (proposed): Alterations to roof to form end gable and rear dormer; installation of three rooflights in front roofslo...

Certificate of Lawful Development Proposed Harrow
Yesterday Pending PL/2377/26

22 Formby Avenue, Kenton, Stanmore, Harrow, HA7 2JZ

Certificate of lawful development (proposed): Alterations to roof to form end gable and rear dormer; installation of three rooflights in front roofslo...

Certificate of Lawful Development Proposed Harrow
2 days ago Pending PL/1860/26

42 West Towers, Pinner, Harrow, HA5 1UA

Replacement roof tiles

Householder Harrow
2 days ago Pending PL/1739/26

6 Headstone Gardens, Harrow, HA2 6PR

Certificate of Lawful Development (Proposed): Alterations and extension to roof to form end gable; rear dormer; three rooflights in front roof slope

Certificate of Lawful Development Proposed Harrow
2 days ago Pending PL/2346/26

90 Parkside Way, North Harrow, Harrow, HA2 6DG

Single storey rear extension: 6.00 metres deep, 3.00 metres maximum height and 2.95 metres high to the eaves

Prior Notification - Larger Home Extension Harrow
2 days ago Pending PL/2366/26

19 Yeading Avenue, Rayners Lane, Harrow, HA2 9RL

Single storey rear extension: 6.00 metres deep, 4.00 metres maximum height and 3.00 metres high to the eaves

Prior Notification - Larger Home Extension Harrow
2 days ago Pending PL/2247/26

DOCTORS SURGERY, 2 Pangbourne Drive, Stanmore, Harrow, HA7 4QT

Change of use from doctors surgery to children's day nursery (Use class E); Single storey rear conservatory extension; conversion of garage into a pla...

Full Planning Application Harrow
2 days ago Pending PL/2337/26

51 Kings Road, South Harrow, Harrow, HA2 9JA

First-floor side and rear extension, including extension of the existing hipped roof to a gable end.

Householder Harrow
5 Sept 2026 Pending PL/1869/26

45 East Towers, Pinner, Harrow, HA5 1TN

Single storey front extension incorporating front porch; single storey side to rear extension; front rooflights and solar panels; landscaping; rear ou...

Householder Harrow
5 Sept 2026 Pending PL/1899/26

8 Northumberland Road, North Harrow, Harrow, HA2 7RD

Certificate of Lawful Development (Proposed): Alterations and extension to roof to form end gable; rear dormer; two rooflights in front roof slope

Certificate of Lawful Development Proposed Harrow
5 Sept 2026 Pending PL/1921/26

37 Turner Road, Edgware, Harrow, HA8 6AT

Front porch; single storey rear extension; rear patio with steps and balustrade

Householder Harrow
5 Sept 2026 Pending PL/2336/26

17 Chartley Avenue, Stanmore, Harrow, HA7 3RA

Single storey rear extension: 5.62 metres deep, 3.75 metres maximum height and 2.72 metres high to the eaves

Prior Notification - Larger Home Extension Harrow
5 Sept 2026 Pending PL/2300/26

184 The Ridgeway, North Harrow, Harrow, HA2 7DD

Single storey front to side extension; Alterations to porch roof (Demolition of side extension)

Householder Harrow
5 Sept 2026 Pending PL/2318/26

27 Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QH

Front porch, Bay window to ground floor front elevation, Relocation of entrance to front elevation; Single and two storey side extension; Installation...

Householder Harrow
5 Sept 2026 Pending PL/2320/26

45 Alicia Gardens, Kenton, Harrow, HA3 8JB

Certificate of Lawful Proposed Development: Alterations to roof to form end gable and rear dormers; Installation of three roof lights in front roof sl...

Certificate of Lawful Development Proposed Harrow
4 Sept 2026 Pending PL/2316/26

51 Kingshill Drive, Kenton, Harrow, HA3 8QD

Single storey rear extension: 6.00 metres deep, 3.40 metres maximum height and 3.00 metres high to the eaves

Prior Notification - Larger Home Extension Harrow
3 Sept 2026 Pending PL/2315/26

8A Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QJ

Single storey rear extension: 4.50 metres deep, 3.00 metres maximum height and 2.80 metres high to the eaves

Prior Notification - Larger Home Extension Harrow
3 Sept 2026 Pending PL/2263/26

36 - 38 High Street, Pinner, Harrow, HA5 5PW

Regularisation of unauthorised internal and external works, including alterations to the internal courtyard (side garden), rear garden landscaping, fr...

Full Planning Application Harrow
2 Sept 2026 Pending PL/2202/26

STANMORE HALL Wood Lane, Stanmore, Harrow

Listed Building Consent: Conversion of third floor penthouse flat into two, two-bedroom flats; with external alterations including adapting two dormer...

Listed Building Consent Harrow
2 Sept 2026 Pending PL/2241/26

113A Vancouver Road, Edgware, Harrow, HA8 5DG

Alterations to roof to form end gable and rear dormer; Roof lights in front roof slopes and window in gable end; Replacement window in first floor sid...

Full Planning Application Harrow
2 Sept 2026 Pending PL/2245/26

10 Vernon Drive, Belmont, Stanmore, Harrow, HA7 2BT

Conversion of garage to habitable room; Replace garage door with window in front elevation; Two storey side to rear extension; Alterations to roof to ...

Householder Harrow
2 Sept 2026 Pending PL/2283/26

76 Hillview Road, Hatch End, Pinner, Harrow, HA5 4PE

Replace garage door with window in front elevation; Single storey rear extension (Demolition of rear extension and canopy to rear)

Householder Harrow
2 Sept 2026 Pending PL/2304/26

4 Welbeck Road, West Harrow, Harrow, HA2 0RG

First floor side to rear extension; External alterations

Householder Harrow
29 Aug 2026 Pending PL/2294/26

2 Kenton Park Road, Kenton, Harrow, HA3 8TY

Single storey rear extension: 5.00 metres deep, 3.69 metres maximum height and 3.00 metres high to the eaves.

Prior Notification - Larger Home Extension Harrow
29 Aug 2026 Pending PL/2164/26

2 Old Forge Close, Stanmore, Harrow, HA7 3EB

Single storey front infill extension incorporating porch; Front entrance canopy; First floor front extension; Conversion of garage to habitable room; ...

Householder Harrow
29 Aug 2026 Pending PL/2256/26

40 Curzon Avenue, Stanmore, HA7 2AN

Certificate of Lawful Proposed Development: Alterations to roof to form end gable and rear dormer; Installation of 2 roof lights in front roof slope

Certificate of Lawful Development Proposed Harrow
29 Aug 2026 Pending PL/2286/26

9 Woodhall Drive, Pinner, Harrow, HA5 4TG

Replacement windows from single to double glazed in front and side elevations

Householder Harrow
28 Aug 2026 Pending PL/2282/26

GREEN TILES Priory Drive, Stanmore, Harrow, HA7 3HL

Single storey rear extension: 7.00 metres deep, 3.77 metres maximum height and 3.55 metres high to the eaves

Prior Notification - Larger Home Extension Harrow
28 Aug 2026 Pending PL/2287/26

19 West End Avenue, Pinner, Harrow, HA5 1BH

Certificate of Lawful Development (Proposed): Alterations to roof to form side mansard with window; rear dormer with rooflight; rooflight in front roo...

Certificate of Lawful Development Proposed Harrow
28 Aug 2026 Pending PL/2280/26

115 Waverley Road, Rayners Lane, Harrow, HA2 9RQ

Single storey rear extension: 5.00 metres deep, 3.30 metres maximum height and 2.75 metres high to the eaves .

Prior Notification - Larger Home Extension 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.