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

Kenton · HA3 · Harrow

Side Return Extension Drawings in Kenton HA3

Fixed-fee, MCIAT-chartered side return extension drawings 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

What HA3 is actually built of

Measured from 245 classified residential buildings in HA3, not from a description of the area.

Kenton HA3 housing mix

Residential building form across the HA3 postcode district, from 245 classified buildings.

Attached on more than one side	41%
Attached on one side	51%
Detached	9%
Median building footprint	72 m²
Addresses per buildingAbove about 2 means flats and maisonettes dominate	1.18
Buildings classified	245

Source: Ordnance Survey National Geographic Database (derived statistics). Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Extracted 2026-08-17.

Side Return Extension Drawings for Kenton (HA3) homes: the package and the process

A side return is a structural drawing as much as a planning one. Removing the original flank wall to open the kitchen into the infill needs a beam and a padstone detail, and the new roof has to be drawn where it meets both the existing rear elevation and the boundary wall.

The boundary is the sensitive line. The drawings set out where the new wall sits relative to it, how the roof drains without discharging next door, and where rooflights fall so the officer can see the room is lit without overlooking. That detail is also what your party wall surveyor will ask for.

The extension only exists where the alley does. Mid-terrace and end-of-terrace houses with a rear outrigger are the classic case; a semi with a flank path is a different scheme with different boundary questions; and a detached house has no side return to infill at all.

Do I need planning permission for a side return extension in London?

Permitted development rights for side extensions are narrower than for rear extensions: they generally cap the extension at a single storey, restrict its width to no more than half the width of the original house, and limit its height. In practice, a full-depth side return running the length of a Victorian or Edwardian terrace usually exceeds one or more of these limits, so most side return projects are drawn and submitted as a full householder planning application.

Conservation area status and Article 4 directions, common across inner London terraces, remove permitted development rights for side extensions entirely in many streets, reinforcing the need for a planning application. We check your property's status before drawing.

What does a side return extension involve?

A side return infills the alley at ground floor level, structurally opening the original flank wall of the kitchen into the new space so the two areas read as one room. Unlike a rear extension, which is bounded on three sides by your own garden, a side return is bounded on one long side by the neighbouring property, which shapes almost every decision in the design, from where the roof glazing sits to how deep the new foundations need to go.

New flank wall built out to align with the rear of the house, following the boundary line
Original external wall between kitchen and alley opened up and supported on a steel or glulam beam
Roof over the new space either glazed in full, glazed in a strip along the boundary for a 'light well' effect, or pitched and tiled to match the main roof
Kitchen re-planned across the combined footprint, often incorporating an island once the room widens

Will I need a Party Wall Agreement for a side return extension?

Almost certainly. Because the new side wall is built on or immediately against the boundary with the neighbouring property, the Party Wall etc. Act 1996 applies, and your neighbour must be formally notified before work starts. We prepare the drawings and dimensions your Party Wall surveyor needs, and time the notice period so it runs alongside, rather than after, your planning application.

Side return project options
Package	What it covers	Typical fee
Side return, planning only	Full householder planning application drawings for the infill	Full Planning pack ~£1,600–£2,400
Side return, planning + Building Regulations	Adds structural calculations, Party Wall drawings and construction detail	Planning + Building Regs pack ~£2,200–£3,850
Side return + rear extension (wraparound)	Combines both extensions into one L-shaped ground floor	see Wraparound Extension Drawings
Measured survey only	A measured existing floor-plan set for your own architect, surveyor or builder	from £450

Sheet from a side return extension drawings package drawn for a Kenton property in HA3, showing the existing and proposed arrangement at scale — A sheet from the side return extension drawings package we submit to London Borough of Harrow for Kenton (HA3) properties.

Also in Kenton HA3

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

FAQ

Side Return Extension Drawings in Kenton HA3 — FAQs

How much does a side return extension cost to design in London?+

Side return drawings start from £1,400. The final fee depends on whether you commission planning drawings alone or a combined planning and building regulations package with structural calculations, all fixed and agreed upfront.

Can I build a side return under permitted development?+

Rarely for a full-width, full-depth side return. Permitted development for side extensions is limited on width and storeys, and most Victorian and Edwardian terraces sit in conservation areas that remove these rights anyway, so a full planning application is the usual route. We still check your specific property first, since some semi-detached and detached houses outside conservation areas retain more generous side-extension allowances.

When do I need to serve Party Wall notice on my neighbour?+

Before work starts, and ideally once your drawings and structural design are settled, since the notice needs accurate dimensions. We can prepare the supporting drawings alongside your planning application so both processes run in parallel.

Do I need an architect for a side return extension?+

No. DrawingsDirect is an MCIAT-chartered architectural technologist practice, so you get the same council-accepted drawings as an architect, for a fixed fee typically around 30% lower, with structural calculations produced in-house.

How long does a side return extension take to design and approve?+

Drawings are typically ready around 7 days from survey. A householder planning application then has a statutory 8-week determination period, running alongside your Party Wall notice period.

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.

Free Fixed Quote

Get your free Kenton planning assessment

Tell us your Kenton (HA3) address and ambition — we'll confirm feasibility, local constraints and a fixed fee within one working day.