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A sunlit attic room with a dormer window and sloping timber ceiling

Loft conversion drawings in Hounslow from £625

Chiswick, Brentford, Isleworth and Feltham: we check whether you sit inside the Bedford Park or Gunnersbury Park directions, then draw to Hounslow’s householder list.

£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

Hounslow’s householder checklist asks for existing and proposed roof plans and sections at 1:50 or 1:100, and a CIL information form. The place that changes a loft most is Chiswick: its Bedford Park and Gunnersbury Park directions say new dormers are acceptable only to the rear and in traditional designs. 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 check of your address against Hounslow’s conservation areas and the two Article 4(2) directions
  • Existing and proposed floor plans, elevations, sections and roof plans at 1:50 or 1:100
  • The CIL additional information form, and a design and access statement where a conservation area calls for one
  • A note of any tree that needs a survey before the loft is drawn
  • Submission to Hounslow, 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 Hounslow loft job runs

  1. Address check

    We check your road against Bedford Park, Gunnersbury Park and Hounslow’s other conservation areas before pricing the route.

  2. Survey

    We measure the roof, the rear slope where a dormer would go, and the floors below, and note trees and flood-zone status.

  3. Draw to the list

    Floor plans, elevations, sections and roof plans at 1:50 or 1:100, with finished floor levels on the sections.

  4. Submit and follow

    We submit by the Planning Portal. If Hounslow writes to say the application is invalid, we answer inside the timeframe it gives.

Bedford Park and Gunnersbury Park: rear dormers only

Hounslow has two conservation-area Article 4(2) directions, for Bedford Park and for Gunnersbury Park, confirmed on 24 July 2001 and covering all the properties in the schedules. Where development fronts a highway or open space they require permission for extensions, new windows, porches, hardstandings, enclosures and painting, and for work to chimney stacks.

The council’s guidance is direct about roofs. For example, a Bedford Park house wanting a loft conversion is told that new dormers need permission and are acceptable only to the rear and in traditional designs where they already prevail. Rooflights also need permission, are usually more acceptable than dormers, and should be to the rear and of the flush conservation type. Removing an original chimney stack needs consent and will not usually be granted.

Mansard loft drawings

What Hounslow’s checklist adds

The householder checklist lists existing and proposed roof plans and sections at 1:50 or 1:100 among its drawings, with section levels showing existing site and finished floor levels. A design and access statement is needed if the site is in a conservation area and creates 100 square metres or more of floor space or a new dwelling, which most lofts do not.

The list also names a tree survey, a method statement where a protected or conservation-area tree is to be felled, and a Flood Risk Matrix where a basement or ground-floor extension sits in flood zone 2 or 3. When an application is invalid, Hounslow writes to the agent by email to say what is missing and by when.

Timing, HMOs and CIL in Hounslow

We cannot promise a decision date; the council sets it. Hounslow’s borough-wide small-HMO direction has been in force since 4 September 2023, which matters if the loft will add bedrooms to a let property.

Hounslow adopted its CIL charging schedule on 24 July 2015 and indexes the rates every year; the 2026 indexation value is 400. Mayoral CIL is charged on top where CIL is due. The council’s CIL form exists so it can establish whether a charge is due, and we complete it with the floor areas from the survey.

Loft conversions in Hounslow in numbers

Questions about loft conversions in Hounslow

Can I add a front dormer in Chiswick?

Not in Bedford Park or Gunnersbury Park, where the council says dormers are acceptable only to the rear. Outside those two areas the conservation area or street may still apply limits, and we check.

Do rooflights need permission in Bedford Park?

Yes. The council says they need permission, are usually more acceptable than dormers and should be to the rear and of a flush conservation type.

Does Hounslow want a CIL form for a loft?

Its checklist asks for the CIL additional information form so it can establish whether a charge is due. We complete it.

Does the HMO direction change a loft plan?

Only if you will let the house as a small HMO. That change of use needs permission across most of the borough since September 2023.

Find out what your Hounslow 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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