House Extension Drawings in North Harrow |

No Article 4 Direction covers Harrow, which keeps the North Harrow permitted-development route open on unlisted houses. North Harrow presents as 1930s semi-detached, so massing and materials carry more weight in the Harrow Council assessment than they would on an outer-London plot. Inside the Stanmore boundary — one of 29 such designations in Harrow — a North Harrow scheme normally goes straight to a full Harrow Council application rather than relying on permitted development. That check comes before anything else on a North Harrow job.

That mapping of Article 4 directions across North Harrow happens before design, which is what keeps the Harrow Council route predictable. On North Harrow plots the original rear wall and the North Harrow Tube ridge line set the envelope. The borough policy layer over every HA2 address is set out on Harrow planning. The North Harrow survey then carries into planning permission in North Harrow if the project runs on to construction.

An incomplete North Harrow pack sits in the London Borough of Harrow validation queue. The first visit to North Harrow is a measured survey — every room, every opening, every level change recorded on site.

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.

After validation a North Harrow application is allocated to an officer, who will visit the HA2 address. The North Harrow pack is validated against London Borough of Harrow requirements before submission.

Most North Harrow refusals trace back to overlooking, not to size. The North Harrow survey records every opening, level change and structural wall.

Party wall procedure catches most HA2 owners late; on North Harrow stock assume it applies and serve in good time. Once consent is granted, building regulations drawings follows for the HA2 property.

North Harrow is characterised by 1930s semi-detached, concentrated across HA2 in the North Harrow / South Harrow area. North Harrow rewards a survey-first approach: the 1930s semi-detached rarely matches its own original drawings. On the ground in North Harrow, 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 Harrow stock it changes the party wall position. The HA2 terrace sets the datum; departures from it show up in the officer report.

Harrow Council assesses North Harrow basements on standard grounds. A North Harrow survey done once feeds loft conversion drawings for HA2 properties and architectural drawings later.

What the North Harrow drawing pack contains

Everything a North Harrow submission needs is in the list below.

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

Local landmarks that shape a North Harrow application

• North Harrow Tube — sightlines from here are part of the Harrow Council character assessment.

Getting to a North Harrow survey

Surveyors travel to HA2 addresses from the studio; the nearest stations are North Harrow, Harrow-on-the-Hill station. Appointments are booked in North Harrow on weekdays and Saturdays, and the measured survey of a standard 1930s semi-detached takes two to three hours.

Where North Harrow sits

on Ordnance Survey grid reference TQ135885, inside the Harrow West parliamentary constituency. Harrow Council checks the North Harrow location plan against that reference before registering it. Source.

Practical detail for a North Harrow submission: local stations are North Harrow and Harrow-on-the-Hill station; post town HARROW; dialling code 020. Site plans are drawn to the address as Harrow Council holds it.

North Harrow postcode coverage

We draw HA2 (North Harrow / South Harrow), shared with South Harrow addresses, and Harrow Council validates each on the address itself.

Streets and stations in North Harrow

Most North Harrow sites are within walking distance of North Harrow or Harrow-on-the-Hill station.

Areas we cover around North Harrow

We survey across Northwood (HA6), Hayes (UB3, UB4), West Drayton (UB7), Ickenham (UB10), Harefield (UB9), Yiewsley (UB7) as well as North Harrow itself, plus the Barnet side of the boundary.

The variables on a HA2 job are structural: party walls, floor levels, and whether the Stanmore designation adds a heritage statement.

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.

That fee is collected by London Borough of Harrow when the HA2 application is lodged. London planning approval-rate dataset · Harrow planning · house extension drawings in London · house extension drawings in Northwood.

An MCIAT chartered technologist takes the North Harrow project from survey to decision. When a North Harrow case could go either way we pay for Harrow Council pre-application advice rather than test it live.

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.

Tell us the HA2 address and what you want to build; the rest we handle. This North Harrow page was reviewed in August 2026.