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A loft bedroom with a pitched ceiling, two roof windows and glazed doors opening to a balcony

Harrow loft conversion plans for £589

Harrow’s checklist says any roof or loft alteration needs a preliminary protected species survey before it decides. We flag that on the first visit, so a bat survey is never a surprise after submission.

  • £439 drawings + £150 survey (£589 total)
  • Survey need flagged early
  • Article 4 areas checked

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What do loft drawings cost in Harrow?

The total is £589: £439 for drawings and submission and £150 for the survey, with no VAT to add. Harrow Council’s fee is paid to the council.

In the Harrow loft fee

  • A roof survey with a note of what the roof void looks like for wildlife
  • A roof plan showing roofing materials and windows, with a scale bar
  • Existing and proposed floor plans and elevations with written dimensions
  • Site sections where levels change, then submission to Harrow
  • Advice on when the protected species survey should be booked
From a tape measure in your loft to a submitted set
From a tape measure in your loft to a submitted set: Roof check, then Roof survey, then Route chosen, then Drawings issued, then SubmittedRoof checkType, ridge height,neighboursRoof surveyRafters, purlins,headroomRoute chosenPermitted,certificate orplanningDrawings issuedAbout 7 days aftersurveySubmittedWe deal with theofficer

Harrow and the loft wildlife question

Under the ecology item of Harrow’s checklist, work on a roof or loft space calls for a preliminary protected species survey ahead of the decision. Heavy existing external lighting, or no vegetation near the works, can remove the need, case by case. Results may lead to more surveys or mitigation, all by a qualified ecologist (Harrow checklist).

We do not carry out ecology work. We tell you at the roof visit whether the survey is likely to be asked for, so the ecologist can be booked at the start rather than after submission.

Plans Harrow wants for a roof

Wherever a roof is created or changed, Harrow wants a roof plan drawn at 1:100 or 1:200 with its scale bar: the roof shape, roofing materials, chimney positions and windows. Elevations and floor plans follow at 1:50 or 1:100, dimensioned in writing.

Class B is closed in conservation areas, and Harrow marks Article 4 directions in Pinner High Street, East End Farm, West Towers, Pinnerwood Park Estate and Pinner Hill Estate (Pinner), and in Harrow Park, Harrow on the Hill Village, South Hill Avenue, Mount Park Estate and Roxborough Park and The Grove (Harrow on the Hill). For example, a dormer in South Hill Avenue is an application, while one outside the conservation areas can be tested against Class B.

Timescale

Harrow decided 657 of 695 householder applications inside 8 weeks in the year to June 2026.

Harrow lofts in numbers

657 of 695
Harrow Council householder applications decided within 8 weeks in the year to June 2026, out of all it decided (prior approvals not counted). MHCLG live table PS2, planning application statistics by district, July 2025 to June 2026 (GOV.UK)
Protected species
Harrow calls for a preliminary protected species survey ahead of the decision when a roof or loft space changes. Harrow: national and local validation checklist, February 2024
1:100 or 1:200
Scales Harrow asks for on roof plans, with a scale bar. Harrow: national and local validation checklist, February 2024
5 in Pinner
Pinner conservation areas marked with an Article 4 direction. Harrow: Pinner conservation areas
5 on the Hill
Harrow on the Hill conservation areas marked with an Article 4 direction. Harrow: Harrow on-the-Hill conservation areas
40 m³ / 50 m³
Permitted roof volume increase: 40 m³ for a terraced house, 50 m³ for other houses. GPDO 2015, Schedule 2, Part 1, Class B: additions to the roof (legislation.gov.uk)
£72.73 per m²
The Mayor of London’s CIL in Harrow (band 2) for permissions granted in 2026, owed only when a scheme is liable for CIL in the first place. Mayoral CIL: annual rate summary for 2026, Table 1 (Greater London Authority)

Harrow loft questions

Does a Harrow loft conversion need a bat survey?

Harrow’s ecology item calls for a preliminary protected species survey ahead of the decision when a roof or loft space changes, judged case by case.

Who does the survey?

A suitably qualified ecologist. We draw the plans and tell you early if it is likely.

Is a loft in Pinner Hill Estate permitted development?

No. Harrow marks it as having an Article 4 direction, and Class B does not apply in conservation areas.

What scale are roof plans?

Harrow wants 1:100 or 1:200, with a scale bar on the sheet.

Check your Harrow roof

Send the address and a roof photo. We tell you the route and quote a fixed fee.

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