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Free 2026 London Planning Report — Rear Extension Drawings in Sudbury HA0

Kitchen extension interior for a 1930s semi in the Sudbury Court area, Brent
Sudbury · HA0 · Brent

Rear Extension Drawings in Sudbury HA0

Fixed-fee, MCIAT-chartered rear extension drawings for Sudbury (HA0) homeowners — London Borough of Brent validation and local constraints handled from the start.

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Sudbury (HA0) centres on the 1930s Sudbury Court estate near Barham Park, where uniform semi-detached frontages mean rear and side extensions succeed best when they keep the front elevation and roofline unchanged.

Sudbury Court is a conservation area with an Article 4 direction over its street elevations, so we check the designation boundary first before advising whether a project is permitted development or needs a householder application.

Kitchen extension interior for a 1930s semi in the Sudbury Court area, Brent
Isometric illustration of a Sudbury HA0 home rear extension drawings design
Proposed floor plan
Sudbury HA0

Planning in Sudbury (HA0): what to know before you apply

Inside the Sudbury Court conservation area the Article 4 direction means front-facing works need permission and a householder application is common. Rear extensions and loft conversions matching the 1930s detailing remain the most dependable approach.

Typical Sudbury housing stock

The Sudbury Court estate in north Wembley is a well-preserved 1930s suburban development of semi-detached and detached houses. Consistent building lines, bay windows and front gardens near Barham Park give the area a strong interwar character.

Streets we regularly draw for in Sudbury

Sudbury Court Drive · Elms Lane · Harrowdene Road · Byron Road

What HA0 is actually built of

Measured from 236 classified residential buildings in HA0, not from a description of the area.

Sudbury HA0 housing mix

Residential building form across the HA0 postcode district, from 236 classified buildings.

Attached on more than one side41%
Attached on one side53%
Detached6%
Median building footprint68 m²
Addresses per buildingAbove about 2 means flats and maisonettes dominate1.35
Buildings classified236

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.

Rear Extension Drawings for Sudbury (HA0) homes: the package and the process

Depth is the number the application turns on, and it has to be measured from the original rear wall of the house rather than from whatever is there now. The drawings carry that dimension, the eaves and ridge heights, the position of any rooflight, and the boundary distances on both sides.

Where the scheme goes beyond the standard allowance and relies on the larger home extension route, the drawings serve a second purpose: they are what the council sends to the neighbours during the consultation. A clear, dimensioned proposed elevation answers the objection about overshadowing before it is made.

Depth is limited by the plot as much as by the rules. A long garden behind a terrace can take the full allowance, while a short one runs out before the rules do — and on a semi or detached house the same depth reads very differently from the boundary.

Do I need planning permission for a rear extension in London?

Many single-storey rear extensions qualify as permitted development, meaning no planning application is needed, provided depth, height and materials stay within set limits. That changes if your property sits in a conservation area or is subject to an Article 4 direction, both of which can remove permitted development rights across a street or borough — in that case a full householder planning application is required regardless of size.

Even where an extension qualifies, most homeowners obtain a Lawful Development Certificate to confirm that status in writing before building — useful for mortgage lenders, buyers and Building Control. We check your property against your borough's constraints before recommending a route.

How deep can a single-storey rear extension go?

Depth is the main constraint on a rear extension, and it depends on your house type and whether you use standard permitted development or the larger home extension scheme.

Permitted development

Standard permitted development allows a single-storey rear extension up to 3 metres deep for terraced and semi-detached houses, or 4 metres for detached houses, generally with eaves height limited to match or stay close to the existing house.

Larger home extension scheme

The prior-approval scheme extends this to 6 metres for terraced and semi-detached houses and 8 metres for detached houses. Your council writes to affected neighbours; if none object within the notification period, approval follows without a full planning application. If an objection is raised, the council assesses the impact on neighbouring light and outlook itself, rather than automatically refusing, so a well-considered design still has a good chance of approval.

Designing the kitchen-diner: rooflights, bi-folds and daylight

Most rear extensions exist to create one open-plan kitchen, dining and living space, so the drawing work focuses on getting light and flow right within the depth you are allowed.

  • Structural opening sized for bi-fold or sliding doors across most of the rear elevation
  • Rooflights or a roof lantern positioned to light the centre of the room, away from the shadow line of the main house
  • Open-plan layout tested against the 45-degree rule, which protects daylight to your neighbours' windows and can limit how close a flank wall or roof comes to the boundary
  • Floor build-up and threshold detail coordinated so the new floor meets the existing one without a step
Rear extension routes at a glance
RouteWhen it appliesTypical fee
Permitted development (Lawful Development Certificate)Depth within 3m (terraced/semi) or 4m (detached), height and materials within PD limitsPD/LDC pack ~£950–£1,450
Larger home extension (prior approval)Depth up to 6m (terraced/semi) or 8m (detached), with neighbour notificationfrom £1,100
Full householder planning permissionExtension exceeds PD/larger-home limits, or the property is in a conservation area with an Article 4 directionFull Planning pack ~£1,600–£2,400
Planning + Building Regulations (structural)Combined planning and construction-ready pack with structural calculations for the opening and roofPlanning + Building Regs pack ~£2,200–£3,850
Sheet from a rear extension drawings package drawn for a Sudbury property in HA0, showing the existing and proposed arrangement at scale
A sheet from the rear extension drawings package we submit to London Borough of Brent for Sudbury (HA0) properties.

Also in Sudbury HA0

Planning PermissionPlanning DrawingsArchitectural DrawingsBuilding Regulations DrawingsLoft Conversion DrawingsRear Extension Drawings across BrentRear Extension Drawings across London
FAQ

Rear Extension Drawings in Sudbury HA0 — FAQs

How much does a rear extension cost to design in London?+
Rear extension drawings start from £1,100, with the final fee set by the route your extension takes — permitted development, prior approval or full planning — and whether you need building regulations and structural calculations bundled in. The fee is fixed and agreed upfront.
Do I need an architect for a rear extension?+
No. DrawingsDirect is an MCIAT-chartered architectural technologist practice, producing the same council-accepted drawings as an architect for a fixed fee typically around 30% lower.
How long does it take to get rear extension drawings?+
Drawings are typically ready around 7 days from survey. Once submitted, councils have a statutory 8-week period to determine a standard householder planning application.
What is the 45-degree rule?+
It is a daylight test many London councils apply to check that a rear extension does not block too much light to a neighbour's nearest window, measured as a line drawn at 45 degrees from that window. We check it before submission, not after a refusal.
Will I need a Party Wall Agreement for a rear extension?+
Only if your foundations or new walls sit on or near the boundary with a neighbouring property. A straightforward rear extension set within your own plot often does not trigger the Party Wall etc. Act 1996, unlike a Side Return or Wraparound extension, which usually does.
Do I need planning permission for a side-return extension in Brent?+
On the Victorian and Edwardian terraces of Kilburn, Willesden and Harlesden a single-storey side-return or rear extension can fall within permitted development, so a full application isn't always needed. Conservation areas such as Queen's Park and Mapesbury restrict this. We check your street's designation first and can confirm permitted development with a Lawful Development Certificate where it qualifies.
What does Brent's borough-wide HMO Article 4 direction affect?+
Brent applies a borough-wide Article 4 direction removing permitted development rights for change of use to an HMO (C3 to C4), so a conversion to a house in multiple occupation needs a full application anywhere in the borough. It doesn't affect a standard family extension or loft, but we confirm whether it applies to your intended use before advising.
Is a hip-to-gable loft conversion allowed on my Brent semi?+
Frequently, yes. The interwar semis of Wembley, Kingsbury and Sudbury suit hip-to-gable and dormer conversions, which often qualify as permitted development within the volume limits. We confirm eligibility against those limits and any conservation or Article 4 constraint, then produce the planning and building-regulations drawings.
How long does Brent Council take to decide?+
Brent determines most householder applications within the statutory eight-week period once validated; conservation cases can attract additional consultation. The dense terraced streets are party-wall-sensitive, so the commonest delay is a drawing query — we prepare submissions to the council's householder guidance to keep them moving.
How much do planning drawings cost in Brent?+
We agree a fixed fee before starting, usually around 30% below an architect's fee for the same council-accepted drawings, with free redraws until Brent approves. A side-return, a hip-to-gable loft and a conservation-area application differ in complexity, so we quote once we understand your street and project rather than by the hour.
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