Two Victorian terraced houses on a London street, one painted white and one in yellow stock brick, with bay windows
Floor plan drawings, pencil sketches of a house, a scale rule and a protractor spread across a desk
Photo: Tima Miroshnichenko / Pexels

Flat conversion drawings · London Borough of Harrow

Flat conversion drawings in Harrow, from £1,095 fixed

Harrow adopted its new Local Plan on 24 March 2026, and Policy HO2 now decides every conversion. The house must be over 130 square metres as originally built, one flat must be a 74 square metre three-bed home with garden access, and the site must be in PTAL 3 to 6. We test all three first.

Flat conversionfrom £945 drawings + £150 survey (£1,095 total)
Council fee£610
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Our fixed fee£795
Council fee, paid to your council£548
Our fee + council fee£1,343
CoverageAll 33 boroughs

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Plus the Planning Portal's own charge if the application goes through the Portal: up to £149 including VAT, depending on the application type, and some types have none (source).

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Starts at£150
Boroughs33/33
Stages5

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A long row of Victorian brick terraced houses with sash windows seen along the pavement
A Victorian terrace, the house type most planning drawings are drawn for. Photo: Peter Morch / Pexels.

What Harrow Council asks of a flat conversion

From the council's Harrow Local Plan 2021-2041, Policy HO2 (Conversion and Redevelopment of Dwellings) (adopted adopted by Full Council on 24 March 2026).

  • The Harrow Local Plan 2021 to 2041 was adopted by Full Council on 24 March 2026, carries full legal weight and replaces the Local Plan adopted in 2012 and 2013. (source, checked 25 October 2026)
  • Policy HO2 grants permission to convert a family-sized home into smaller self-contained units only where the existing dwelling exceeds 130 square metres as originally built, or could be accepted to be extended to that size, when two or more units are proposed. (source, checked 25 October 2026)
  • The conversion must provide at least one family-sized home of at least 74 square metres gross internal area capable of providing a 3 bedroom, 4 person dwelling on the ground floor, or if that is not possible on the upper floors, with access to a dedicated rear garden, and the site must be within PTAL 3 to 6. (source, checked 25 October 2026)
  • Schemes must meet the London Plan minimum space standards, have a ground-floor flat well designed for older and disabled residents, be dual aspect with satisfactory privacy, daylight and outlook, and subdivide amenity space so each unit has private space. (source, checked 25 October 2026)
  • Policy HO2 asks for a single front door where possible, more soft landscaping on the forecourt, parking in line with Policy M2, well designed cycle storage that avoids clutter on the frontage, and refuse storage that does not harm the street. (source, checked 25 October 2026)
  • The supporting text says 'as originally built' means before extensions, that extensions made before 1948 count, and that lofts and cellars not originally habitable are excluded from the area; over-intensive conversions are to be refused, and the same criteria apply to demolishing a home to build two. (source, checked 25 October 2026)

What Harrow flat conversion drawings have to show

A Harrow flat conversion starts with the sum in Policy HO2: the area as originally built against 130 square metres, counting pre-1948 extensions but not the loft or cellar. If the house is short, we test whether an extension in line with the Residential Design Guide could bring it over. Then we draw where the 74 square metre three-bed flat sits, on the ground floor with the rear garden where we can.

The set is drawn to the policy's list: each flat against the London Plan space standards, dual aspect shown on the plans, the garden divided so every flat has a private space, one front door, bin and cycle stores kept off the frontage, and the forecourt re-planted. We state the address's PTAL on the drawings because the policy needs 3 to 6.

PS2 · at a glance

Harrow: 917 householder decisions

Harrow
Approvals, prior approvals included81.7%

749 of 917 granted. London: 85.8%.

Decided within 8 weeks94.5%

657 of 695 applications, prior approvals excluded.

Source: MHCLG PS2, 1 July 2025 to 30 June 2026. Dark tick: London.
An open-plan living room with an exposed brick wall, a sofa and a dining table under pendant lights
An open-plan ground floor: knocking rooms together is where a beam, and structural calculations, come in. Photo: Max Vakhtbovych / Pexels.

What it costs in Harrow

  • House to two flats drawings: from £945 drawings + £150 survey (£1,095 total), plus £610 to Harrow Council.
  • Change of use application fee, paid to your council.

Flat conversion drawings across London · Harrow planning rules · every price

Answers

Harrow flat conversion questions

Can I convert my house into flats in Harrow?
Under Policy HO2 of the Harrow Local Plan, adopted on 24 March 2026, only if the house exceeds 130 square metres as originally built, or could be extended to that size, and the site is in PTAL 3 to 6. One flat must be a family-sized home of at least 74 square metres, with three bedrooms and rear garden access.
What counts as originally built floor area in Harrow?
The area of the property before any extensions. Harrow's supporting text says extensions made before 1948 can be included, while lofts and cellars that were not originally habitable are not. This is the area compared with the 130 square metre threshold, so we measure the house to that definition before we draw.
Where must the family flat go in a Harrow conversion?
Policy HO2 says the family-sized home of at least 74 square metres should be capable of three bedrooms and four people, on the ground floor with access to a dedicated rear garden, or on the upper floors if the ground floor is not possible. The policy also asks that the ground-floor flat suits older and disabled people.

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02
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£175
03
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£225
04
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05
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Total, planning application£795
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