Loft Conversion Drawings in Hanworth | From £1,225

No Article 4 Direction covers Hounslow, which keeps the Hanworth permitted-development route open on unlisted houses. Hanworth reads as 1930s semi-detached, and that is the context a TW13 scheme is judged in. Conservation status changes the Hanworth route entirely — Chiswick being the usual case among the 30 designations in Hounslow. Conservation status is checked against the Hanworth address before design.

Article 4 directions are checked street by street in Hanworth; the borough-wide answer is rarely the whole answer. A TW13 survey answers most of it — where the 1930s semi-detached allows the rear wall to go. The borough policy layer over every TW13 address is set out on Hounslow planning. The Hanworth survey then carries into house extension drawings in Hanworth if the project runs on to construction.

Expect one to two weeks of London Borough of Hounslow validation on a Hanworth submission before the statutory period even begins. Step one at a TW13 address is a full measured survey of the existing building.

Statutory periods: 8 weeks from validation for a householder application, 13 weeks for a major scheme, 6 weeks for prior approval with a 21 days neighbour consultation, and 5 weeks for a full plans building control submission. A party structure notice requires one month notice and two months where excavation is involved.

A Hanworth case only reaches committee if it draws significant objection. The TW13 pack is issued at 1:100 and 1:50 with a 1:1250 location plan.

We would rather redesign a TW13 rear elevation than argue an objection. The Hanworth survey includes the boundary line and neighbouring window positions.

The party wall step is not optional on shared Hanworth walls, and serving late is what stalls sites. Once consent is granted, architectural drawings follows for the TW13 property.

Hanworth is characterised by 1930s semi-detached, concentrated across TW13 in the Feltham area. On Hanworth plots, structure follows the 1930s semi-detached that is already there. Locally that resolves to this: the 1930s hipped roof here needs a hip-to-gable before a rear dormer works, which pushes the volume calculation toward the 50 m³ permitted-development ceiling. That is drawn out in the Hanworth proposed section. Case officers at Hounslow Council look first at whether a TW13 scheme keeps the eaves and ridge line of the Hanworth row.

A TW13 dig turns on engineering more than on policy. A Hanworth survey done once feeds planning permission for TW13 properties and building regulations drawings later.

What the Hanworth drawing pack contains

• existing roof plan and section for the Hanworth property
• proposed dormer elevations
• volume calculation sheet
• staircase and head-height sections
• structural steel layout

Streets and landmarks we survey around Hanworth

• Hampton Hill — front-to-back level changes that drive the Hampton Hill section drawings.
• Hanworth Park — roof profiles that set the ridge datum Hounslow Council measures a Hanworth Park dormer against.
• London Air Park — front-to-back level changes that drive the London Air Park section drawings.
• Hanworth Air Park — shared flank walls, so Hanworth Air Park party structure notices go out before work starts.
• Hanworth Park — schemes visible from it get closer scrutiny in Hounslow.
• Hounslow Heath — proposals within its setting are drawn with the context elevation included.

Getting to a Hanworth survey

Surveyors travel to TW13 addresses from the studio; the nearest stations are Feltham, Hampton, Kempton Park, Hounslow East. Appointments are booked in Hanworth on weekdays and Saturdays, and the measured survey of a standard 1930s semi-detached takes two to three hours.

Where Hanworth sits

on Ordnance Survey grid reference TQ3682. Location and block plans for Hanworth start from that grid square. Source.

Practical detail for a Hanworth submission: transport for Hanworth runs through Feltham and Hampton and Kempton Park and Hounslow East; Royal Mail routes it as HOUNSLOW; dialling code 020. Site plans are drawn to the address as Hounslow Council holds it.

Hanworth postcode coverage

Hanworth work spans TW13 (Feltham), shared with Feltham, with the TW13 boundary setting which designations bite.

Streets and stations in Hanworth

We survey Hanworth addresses on Hampton Hill, Hanworth Park, London Air Park and Hanworth Air Park. most Hanworth sites are within walking distance of Feltham or Hampton or Kempton Park.

Areas we cover around Hanworth

Beyond Hanworth we cover Whitton (TW2), Ham (TW10), Mortlake (SW14), Chiswick (W4), Brentford (TW8), Isleworth (TW7), and cross into Ealing. A consent granted a mile from Hanworth Park is not a precedent for the plot next to it.

What changes a Hanworth fee is the property: 1930s semi-detached construction, shared walls on TW13, and whether heritage input is needed.

Statutory application fees are set by regulation, not by the council: £548 householder, £610 for a new dwelling, £274 for a lawful development certificate, £249 for prior approval.

The statutory charge on a Hanworth application goes to London Borough of Hounslow at submission. London planning approval-rate dataset · Hounslow planning · the London loft conversion drawings pillar page · loft conversion drawings in Whitton.

We are architectural technologists, MCIAT chartered, and every Hanworth set carries that accountability. Not every Hanworth scheme is clear-cut. Where Chiswick or the Hanworth Park setting is in play, Hounslow Council pre-application advice comes before the TW13 submission.

Drawings are produced by chartered members of the Chartered Institute of Architectural Technologists (MCIAT), the professional body for technical design and building-regulations competence. First-time approval across our London caseload is 98%. Statutory fees shown are those in force in England in 2026 under the Town and Country Planning (Fees for Applications) Regulations. Confirm your local authority at gov.uk and submission requirements on the Planning Portal. Studio: 71–75 Shelton Street, London WC2H 9JQ.

We will tell you if a Hanworth project does not need us. This Hanworth page was reviewed in August 2026.