House Extension Drawings in Hendon |

No Article 4 Direction covers Barnet, which keeps the Hendon permitted-development route open on unlisted houses. Hendon is 1930s semi-detached, post-war flats — a house extension drawings submission has to answer that context rather than a generic London template. Hampstead Garden Suburb is the designation that most often reshapes a Hendon proposal; Barnet carries 20 of them. The designation map is read street by street in Hendon.

That mapping of Article 4 directions across Hendon happens before design, which is what keeps the Barnet Council route predictable. On Hendon stock the constraint is physical before it is planning: the 1930s semi-detached fixes the rear wall line and the RAF Museum roofline caps the ridge. The borough policy layer over every NW4 address is set out on Barnet planning. The Hendon survey then carries into building regulations drawings in Hendon if the project runs on to construction.

Barnet Council will not register a Hendon application until validation completes. No Hendon design work starts until the measured survey is complete.

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.

Expect a site visit to the Hendon property during the consultation period. We format the Hendon set exactly as Barnet Council wants to receive it.

London Borough of Barnet weighs material objections only — a Hendon neighbour disliking the design is not one. Party wall positions on a Hendon terrace are located during the survey.

Budget notice time on any Hendon job touching a shared wall. Once consent is granted, loft conversion drawings follows for the NW4 property.

Hendon is characterised by 1930s semi-detached, post-war flats, concentrated across NW4 in the Hendon area. The 1930s semi-detached across Hendon decides how a scheme is built, not just how it looks. On NW4 plots specifically, 1930s semis here have the deepest rear gardens in the area, which is why the 6 m and 8 m larger-home prior approval route gets used so often. On a Hendon terrace it governs the rear opening width. Because the Hendon streetscape near RAF Museum is consistent, departures in ridge height read immediately in an officer report.

Barnet sets no special basement rule, so a Hendon lower-ground scheme stands or falls on the engineering and the neighbours. The Hendon measured survey is reused across architectural drawings for NW4 properties and planning permission, so the cost lands once.

What the Hendon drawing pack contains

Each Hendon instruction produces this set of drawings.

• existing and proposed ground-floor plans for the Hendon property
• proposed rear elevation
• long section through the extension
• site and block plans
• party wall position drawing

Streets and landmarks we survey around Hendon

• Golders Green — gardens deep enough for the 8 weeks householder route on a Golders Green plot.
• Childs Hill — frontages visible from the highway, so Hampstead Garden Suburb materials detail governs the Childs Hill elevation.
• North Circular Road — frontages visible from the highway, so Hampstead Garden Suburb materials detail governs the North Circular Road elevation.
• Edgware Road — gardens deep enough for the 8 weeks householder route on a Edgware Road plot.
• Watling Street — gardens deep enough for the 8 weeks householder route on a Watling Street plot.
• Canons Park — shared flank walls, so Canons Park party structure notices go out before work starts.
• Mill Hill — front-to-back level changes that drive the Mill Hill section drawings.
• Sunny Hill Park — frontages visible from the highway, so Hampstead Garden Suburb materials detail governs the Sunny Hill Park elevation.
• RAF Museum — schemes in view of it attract closer officer scrutiny.
• Finchley Memorial Hospital — nearby 1930s semi-detached takes its scale from this frontage.
• Hendon Library — a Hendon roof extension is judged against the datum it sets.
• Brent Reservoir — proposals within its setting are drawn with the context elevation included.
• Hasmonean High School — it fixes the local datum a Hendon roof extension is judged against.

Getting to a Hendon survey

Surveyors travel to NW4 addresses from the studio; the nearest stations are Hendon, Hendon Central, Welsh Harp. Appointments are booked in Hendon on weekdays and Saturdays, and the measured survey of a standard 1930s semi-detached takes two to three hours.

Where Hendon sits

Hendon lies 7 miles (11 km) northwest of Charing Cross, on Ordnance Survey grid reference TQ229887. Those coordinates matter in practice: a site location plan for Barnet Council must be drawn to a recognised scale over the correct grid square. Source.

Practical detail for a Hendon submission: Hendon and Hendon Central and Welsh Harp cover the NW4 area; mail for Hendon routes via LONDON; dialling code 020. Site plans are drawn to the address as Barnet Council holds it.

Hendon postcode coverage

Our Hendon coverage takes in NW4 (Hendon), which Hendon holds on its own.

Streets and stations in Hendon

Typical Hendon work sits on Golders Green, Childs Hill, North Circular Road, Edgware Road, Watling Street, Canons Park, Mill Hill and Sunny Hill Park. most Hendon sites are within walking distance of Hendon or Hendon Central or Welsh Harp.

Areas we cover around Hendon

Work spreads across Bush Hill Park (EN1), Oakwood (N14), Finchley (N3, N12), Hampstead Garden Suburb (NW11), Golders Green (NW11), Muswell Hill (N10) as well as Hendon itself.

Price differences between Hendon projects come from the fabric — the 1930s semi-detached, level changes, and any Hampstead Garden Suburb heritage requirement.

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.

London Borough of Barnet collects the statutory fee when the Hendon application is submitted. London planning approval-rate dataset · Barnet planning · House Extension Drawings London-wide · house extension drawings in Bush Hill Park.

Drawings for Hendon are issued under MCIAT charter, which is the technical design and construction-detailing qualification rather than an RIBA registration. A tight Hendon plot — RAF Museum in the setting, a shared flank wall on NW4 — goes to Barnet Council for advice before it goes to determination.

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.

Send the Hendon address; we will come back with the route and the fee. This Hendon page was reviewed in August 2026.