Kitchen extension to a 1930s semi-detached house in Kenton HA3, building regulations drawings for Harrow Council

Kenton · HA3 · Harrow

Planning Permission in Kenton HA3

Fixed-fee, MCIAT-chartered planning permission for Kenton (HA3) homeowners — London Borough of Harrow validation and local constraints handled from the start.

Kenton (HA3) is a 1930s semi-detached suburb straddling the Harrow–Brent border, where the everyday project is a rear kitchen extension, a hip-to-gable or L-shaped dormer loft, or a two-storey side extension that adds a bedroom while keeping the interwar frontage in proportion.

Around the Mount Stewart and Northwick Circle conservation areas we take extra care with roof form, materials and the building line, and we always confirm whether an address falls to Harrow Council so the application is validated first time.

Proposed floor plan

Kenton HA3

Kenton (HA3) — planning at a glance

Council: London Borough of Harrow
Postcode district: HA3
Planning portal: View the Harrow planning portal
Housing stock: Interwar semi-detached and short terraced houses laid out as a 1930s suburb straddling the Harrow and Brent border, typically with bay windows, hipped roofs and off-street parking. Plots are regular with modest-to-generous rear gardens well suited to single-storey additions.
Article 4: London Borough of Harrow does not publish its Article 4 directions to the national planning register, so permitted development rights in Kenton (HA3) can’t be confirmed from open data alone — we check the direction schedule with the council before recommending a route, as part of the fixed fee. Interwar suburban character straddling the Harrow/Brent boundary — consistent semi-detached frontages guide the scale of additions.
Conservation: Mount StewartNorthwick Circle
Sample streets: The Ridgeway · Draycott Avenue · Windermere Avenue · Northwick Circle
Local constraints: The Mount Stewart and Northwick Circle conservation areas protect pockets of planned interwar layout and consistent frontagesSemi-detached pairs mean party-wall and roofline matching are key considerations for side and loft extensionsNeighbour amenity and rear-garden depth govern how far single-storey extensions can projectThe Harrow/Brent borough boundary runs nearby, so confirming the correct planning authority for each address matters

Planning in Kenton (HA3): what to know before you apply

No published householder Article 4 direction, though the Mount Stewart and Northwick Circle conservation areas curb some permitted-development rights; the main watch-points are matching the semi-detached roofline and confirming the correct authority near the Harrow/Brent boundary.

Typical Kenton housing stock

Interwar semi-detached and short terraced houses laid out as a 1930s suburb straddling the Harrow and Brent border, typically with bay windows, hipped roofs and off-street parking. Plots are regular with modest-to-generous rear gardens well suited to single-storey additions.

Streets we regularly draw for in Kenton

The Ridgeway · Draycott Avenue · Windermere Avenue · Northwick Circle

Planning Permission for Kenton (HA3) homes: the package and the process

Every planning permission we prepare for an Kenton property is drawn to London Borough of Harrow’s validation standards and tuned to the HA3 constraints above. Here is what the drawing package covers and how the process runs from first survey to approval.

Securing planning permission in London means navigating borough-specific design guidance, conservation areas, Article 4 directions and a validation checklist that differs from one council to the next. DrawingsDirect prepares the existing and proposed drawings your local planning authority needs, submits them through the Planning Portal, and manages the application to a decision — for a fixed fee agreed before we start.

Because we are MCIAT-chartered architectural technologists rather than a general architecture practice, you get the same council-accepted drawings and professional accountability at a typically lower fee, with structural coordination handled in-house.

Do I need planning permission for an extension in London?

Many single-storey rear extensions, loft conversions and outbuildings fall under permitted development rights and do not need a full planning application — but London's dense housing stock, conservation areas and Article 4 directions frequently withdraw those rights. Before you pay for a full application, we check your property against the current permitted development thresholds and your borough's local constraints.

Where permitted development applies, we recommend a Lawful Development Certificate instead of full planning — it is faster, cheaper and gives you a legal document confirming the work was lawful. Where a full application is genuinely required, we prepare it properly the first time.

Permitted development vs a full planning application

Permitted development lets you build within defined volumetric limits without committee review. A full householder application is assessed against the borough's local plan for scale, daylight, neighbour impact and design. We advise which route your project qualifies for and why.

Article 4 directions and conservation areas

If your home sits in a conservation area or under an Article 4 direction, permitted development rights are often removed — meaning even modest changes need consent. Each borough page lists the local directions and conservation areas we routinely design around.

How do you apply for planning permission through the London Planning Portal?

We manage the full lifecycle of your submission — survey, drawings, supporting documents and officer liaison — so you never have to decode a validation checklist yourself.

Phase 1 — existing and proposed site surveys

A laser-measured survey captures your property exactly, so existing and proposed drawings match reality millimetre for millimetre.

Phase 2 — technical drawing package

Site location plan, block plan, floor plans, elevations and sections drawn to your borough's scale and formatting requirements, with a design and access statement where needed.

Phase 3 — liaison with the planning officer

We answer the council's queries, negotiate amendments, and redraw free until the decision lands.

Typical fixed-fee planning drawing packages
Package	Production window	Compliance layer	Typical fee
Permitted Development pack	7–10 working days	Lawful Development Certificate submission	£950–£1,450
Full Planning pack	10–14 working days	Council liaison & design statement	£1,600–£2,400
Planning + Building Regs pack	14–21 working days	Structural calculations included	£2,200–£3,850

Also in Kenton HA3

Planning Drawings Architectural Drawings Building Regulations Drawings Loft Conversion Drawings House Extension Drawings Planning Permission across Harrow Planning Permission across London

FAQ

Planning Permission in Kenton HA3 — FAQs

How long does it take to get planning permission from a London council?+

Householder applications carry a statutory 8-week determination period. We deliver your drawings within about 7 days of survey, so the council clock can start quickly. Lawful Development Certificates usually resolve faster.

What happens if the council refuses?+

Refusals are rare because every drawing is checked against your borough's local plan before submission. If it happens we advise on revisions or handle the appeal — many refusals recover at appeal.

Do you cover my borough?+

Yes — we submit across all 33 London boroughs every week. Each borough has its own page covering local conservation, Article 4 and validation quirks.

Is the fee really fixed?+

Yes. We quote a fixed fee before we start and it does not move, even when the council asks for revisions — those redraws are free.

Do I need planning permission for a loft conversion in Harrow?+

Harrow's Metro-land semis and detached houses in Rayners Lane, Kenton and Stanmore suit hip-to-gable and dormer lofts, which frequently qualify as permitted development within the volume limits. The exceptions are the conservation areas — Harrow on the Hill and Pinner's historic core — and the Article 4 wards. We check your address and can confirm permitted development with a Lawful Development Certificate.

What does Harrow expect for a rear extension on a 1930s semi?+

The council pays close attention to preserving the rhythm and building line of its interwar suburban streets, so extensions are expected to respect the established line and roof form. Many single-storey rear extensions still fall within permitted development; where a full application is needed, we design to the borough's residential guidance so it validates and approves without repeated revisions.

Can I extend a home in Harrow on the Hill or Pinner?+

Yes, but these historic conservation areas carry a heritage setting and long views the council protects closely, so permitted development is often restricted and a full, context-led application is required. We design to the character of the area — materials, proportions and rooflines — and evidence the heritage considerations so the submission stands up.

How long does Harrow Council take to decide?+

Harrow determines most householder applications within the statutory eight-week period once validated. The commonest delay is a validation query, so we prepare Harrow submissions to the council's checklist with correctly scaled existing and proposed drawings and a location plan to keep the application on track.

How much do planning drawings cost in Harrow?+

We work to a fixed fee agreed upfront, usually around 30% below an architect's charge for the same council-accepted drawings, with free redraws until Harrow approves. The figure depends on the scheme — a dormer loft differs from a double-storey extension — so we confirm it once we understand your project rather than billing by the hour.

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