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A bright loft bedroom with sloping ceilings and two skylight windows

Loft conversion drawings in Merton from £625

Wimbledon, Raynes Park, Mitcham, Morden and Merton Park: we draw to Merton’s checklist, including the fire strategy it expects even on a householder loft.

£625 £475 drawings + £150 survey (£625 total), no VAT to add

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We check conservation areas and other limits for this address.

In a sentence or two: your plans, and any feedback from the council so far.

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The short answer

Merton Council’s local validation checklist, updated in June 2026, asks every householder for a Planning Fire Safety Strategy or a reasonable exception statement, which catches most loft conversions because a new storey changes the escape route. It also wants roof plans and a 45 degree line on the proposed drawings. Our fee is £475 drawings + £150 survey (£625 total), no VAT to add; the council’s fee is separate.

Loft conversion drawings

from £625

Drawings
£475
Measured survey
£150
Total you pay
£625
VAT
None to add
  • A measured survey of the roof, the stair and the landing below
  • A fire safety statement that sets out the escape route, or a reasonable exception statement
  • Existing and proposed plans and elevations, roof plans at 1:50 or 1:100, and the 45 degree line from the nearest neighbouring window
  • A biodiversity enhancement statement, where the work is exempt from statutory net gain
  • A check of your road against Merton’s conservation areas, including the John Innes directions
  • Submission to Merton, an independent check of every sheet and free redraws until approval

£475 drawings + £150 survey (£625 total). A starting fee: we confirm one fixed figure after checking your address. The council’s own fee, where there is one, is paid to the council.

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How a Merton loft job runs

  1. Address check

    We check your road against Merton’s conservation areas and the John Innes Article 4 directions in Merton Park and Wilton Crescent.

  2. Survey

    We measure the roof and the stair, and note the nearest habitable-room windows next door that the 45 degree line is drawn from.

  3. Draw to the list

    Floor plans, elevations, roof plans and sections, with the 45 degree line shown on the proposed drawings.

  4. Submit and follow

    We submit with the fire statement and biodiversity statement, and answer the case officer.

The fire statement on a householder loft

Merton’s checklist says that householder and non-major developments must submit a Planning Fire Safety Strategy, or a Reasonable Exception Statement if London Plan policy D12(A) is not considered relevant.

The author must show suitable fire safety knowledge and qualifications. For example, a loft added over a Raynes Park semi with a single stair needs the statement to say how the new bedroom escapes, which is why the stair and landing below are surveyed as part of the loft.

Building regulations drawings

John Innes and the rest of Merton’s conservation areas

Merton’s conservation areas list links Article 4 directions for John Innes (Merton Park): direction No 1 of 1986 and No 2 endorsed by the Secretary of State in February 1990, with two Article 4(2) directions in July 2007. The same pattern of 1986 and 1990 directions applies to John Innes Wilton Crescent. If your house is on one of those roads, we read the direction before the dormer is drawn.

Merton has also withdrawn permitted development rights for conversion of a home to a small HMO across the whole borough, in two stages: seven wards from 17 November 2022, then the remaining 13 wards from 24 March 2026. That matters if the loft will add bedrooms to a house you intend to let.

Timing and CIL in Merton

We cannot promise a decision date. We keep the application complete, with roof plans at 1:50 or 1:100 and the 45 degree line, so it is validated first time.

Merton’s CIL is split between two residential zones. The latest rate summary, for 2025, shows £359.92 a square metre in Colliers Wood, Raynes Park and Wimbledon and £188.14 in Mitcham, Morden and West Barnes, with Mayoral CIL on top. A typical loft is not large enough for it to bite, but the council may ask for the information form.

Loft conversions in Merton in numbers

Questions about loft conversions in Merton

Why does Merton want a fire statement for a loft?

Its checklist requires a fire safety strategy or a reasonable exception statement from householders and other non-major applicants. We write it with the drawings.

What is the 45 degree line?

A line drawn on the proposed plans and elevations from the nearest habitable-room window next door to the development, which shows the effect on that room.

Is John Innes Merton Park different?

Yes. It has Article 4 directions from 1986, 1990 and 2007, so changes that are normally permitted can need an application.

Does the HMO direction affect me?

Only if you plan to let the house as an HMO. Merton now requires permission for that across the whole borough.

Find out what your Merton loft needs

Send the address and a photo of the back of the house. We reply with the route and a fixed fee, from £475 drawings + £150 survey (£625 total).

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