House Extension Drawings in Harrow Weald |

No Article 4 Direction covers Harrow, which keeps the Harrow Weald permitted-development route open on unlisted houses. Harrow Weald reads as 1930s semi-detached, Green Belt, and that character is precisely what a Harrow Council case officer tests a proposal against. Inside the Stanmore boundary — one of 29 such designations in Harrow — a Harrow Weald scheme normally goes straight to a full Harrow Council application rather than relying on permitted development. We confirm the HA3 designation at survey rather than assuming it.

We map how Article 4 directions bite across HA3 before a line is drawn. The 1930s semi-detached in Harrow Weald decides the depth before policy does. The borough policy layer over every HA3 address is set out on Harrow planning. The Harrow Weald survey then carries into planning permission in Harrow Weald if the project runs on to construction.

One to two weeks at London Borough of Harrow before a Harrow Weald case reaches an officer. Step one at a HA3 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.

Amendments during the Harrow Weald determination are handled without a resubmission where possible. Each HA3 drawing carries the address, scale, north point and revision.

Comments on a Harrow Weald application are visible on the London Borough of Harrow portal. We measure the HA3 property room by room, including ceiling heights and floor falls.

Party wall procedure catches most HA3 owners late; on Harrow Weald stock assume it applies and serve in good time. Once consent is granted, building regulations drawings follows for the HA3 property.

Harrow Weald is characterised by 1930s semi-detached, concentrated across HA3 in the Harrow Weald / Kenton / Wealdstone area. On Harrow Weald streets the 1930s semi-detached sets the structural sequence — what can be opened up, where the load goes, how deep you can build. What that means for a HA3 address: 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 the 1930s semi-detached in Harrow Weald it sets the beam run. The blocks around Harrow Weald Common set the prevailing eaves and ridge lines, and Harrow Council officers reference that rhythm when assessing height and massing on a Harrow Weald street.

No borough-specific basement policy applies in Harrow, so subterranean work at a Harrow Weald address is judged on amenity, drainage and structural grounds. The same Harrow Weald drawings carry through to loft conversion drawings for HA3 properties and architectural drawings.

What the Harrow Weald drawing pack contains

What lands in your inbox after a Harrow Weald survey:

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

Local landmarks that shape a Harrow Weald application

• Pinner Green — frontages visible from the highway, so Stanmore materials detail governs the Pinner Green elevation.
• Harrow Weald Common — proposals within its setting are drawn with the context elevation included.
• Harrow College — massing on adjoining HA3 plots is tested against it.
• Harrow Weald Common — proposals within its setting are drawn with the context elevation included.
• Bushey Heath — it fixes the local datum a Harrow Weald roof extension is judged against.

Getting to a Harrow Weald survey

Surveyors travel to HA3 addresses from the studio; the nearest stations are Headstone Lane, Harrow & Wealdstone station. Appointments are booked in Harrow Weald on weekdays and Saturdays, and the measured survey of a standard 1930s semi-detached takes two to three hours.

Where Harrow Weald sits

on Ordnance Survey grid reference TQ151907. Harrow Council checks the Harrow Weald location plan against that reference before registering it. Source.

Practical detail for a Harrow Weald submission: residents use Headstone Lane and Harrow & Wealdstone station; correspondence uses HARROW; dialling code 020. Site plans are drawn to the address as Harrow Council holds it.

Harrow Weald postcode coverage

We survey and draw across HA3 (Harrow Weald / Kenton / Wealdstone), shared with Kenton, Wealdstone. The HA3 boundary decides which Harrow designations apply to your Harrow Weald address.

Streets and stations in Harrow Weald

Harrow Weald instructions come from Pinner Green among others. most Harrow Weald sites are within walking distance of Headstone Lane or Harrow & Wealdstone station.

Areas we cover around Harrow Weald

We survey across Uxbridge (UB8), Ruislip (HA4), Northwood (HA6), Hayes (UB3, UB4), West Drayton (UB7), Ickenham (UB10) as well as Harrow Weald itself, plus the Brent side of the boundary.

Two Harrow Weald jobs differ in price because of the 1930s semi-detached and the Stanmore designation, never because of hours booked.

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 charge is London Borough of Harrow's, taken when the Harrow Weald application is lodged. London planning approval-rate dataset · Harrow planning · House Extension Drawings London-wide · house extension drawings in Uxbridge.

MCIAT chartered technologists handle every HA3 submission we make. Borderline is normal in Harrow Weald; we resolve it with Harrow Council before submission rather than after refusal.

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.

The first step for a Harrow Weald owner is a measured survey, not a design. This Harrow Weald page was reviewed in August 2026.