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Free 2026 London Planning Report — Rear Extension Drawings in Hanwell W7

Rear extension drawings for a Victorian terrace in Hanwell W7, London Borough of Ealing
Hanwell · W7 · Ealing

Rear Extension Drawings in Hanwell W7

Fixed-fee, MCIAT-chartered rear extension drawings for Hanwell (W7) homeowners — London Borough of Ealing validation and local constraints handled from the start.

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Hanwell (W7) keeps a genuine village feel around its green, with historic buildings on spacious, tree-filled plots giving way to consistent Victorian and Edwardian terraces on the surrounding streets. Rear and loft projects follow the familiar Ealing terrace pattern on most roads, but the conservation-area picture is more layered than it first looks.

The Hanwell Village Green conservation area protects the older core, while the St Mark's Church and Canal area runs along the Brent and the Grand Union Canal to the south. We establish which context a Hanwell property sits in — ordinary terrace, protected village core or canal-side setting — before drawing to the borough's guidance.

Rear extension drawings for a Victorian terrace in Hanwell W7, London Borough of Ealing
Isometric illustration of a Hanwell W7 home rear extension drawings design
Proposed floor plan
Hanwell W7

Planning in Hanwell (W7): what to know before you apply

W7 carries no householder Article 4 direction affecting typical work, so many Hanwell houses retain permitted development rights for rear and loft projects — but the Hanwell Village Green, St Mark's Church and Canal, and Hanwell Cemeteries conservation areas are the exceptions where character, plots and trees are actively protected. London Borough of Ealing does not publish an Article 4 schedule to the national open-data register, so we verify the current position with the council before advising.

Typical Hanwell housing stock

Late-Victorian and Edwardian terraces and semi-detached houses across the district, older historic buildings on spacious plots around the village green, and larger houses in the Golden Manor enclave.

Streets we regularly draw for in Hanwell

Church Road · Boston Road · Golden Manor · Cuckoo Avenue · Green Lane

What W7 is actually built of

Measured from 410 classified residential buildings in W7, not from a description of the area.

Hanwell W7 housing mix

Residential building form across the W7 postcode district, from 410 classified buildings.

Attached on more than one side47%
Attached on one side50%
Detached3%
Median building footprint60 m²
Addresses per buildingAbove about 2 means flats and maisonettes dominate1.33
Buildings classified410

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 Hanwell (W7) 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 Hanwell property in W7, showing the existing and proposed arrangement at scale
A sheet from the rear extension drawings package we submit to London Borough of Ealing for Hanwell (W7) properties.

Also in Hanwell W7

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

Rear Extension Drawings in Hanwell W7 — 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 rear extension in Ealing?+
Many Ealing semis and terraces keep permitted development rights for a single-storey rear extension, so a full application isn't always needed. But the borough-wide Article 4 direction on HMO conversions, and conservation areas such as Bedford Park and Pitshanger, remove or restrict those rights in places. We check your address against the designations first and, where it qualifies, confirm permitted development with a Lawful Development Certificate.
What extra control applies in Bedford Park?+
Bedford Park is one of West London's most tightly controlled conservation areas, with detailed control over materials, rooflines, windows and front elevations. A standard permitted-development dormer or cladding change usually won't apply; instead we design to the area's Arts-and-Crafts character and prepare a full householder application with the elevations and materials the council expects — the reliable route to approval there.
How long does Ealing Council take to decide a householder application?+
Ealing determines most householder applications within the statutory eight-week period once they are validated. The commonest cause of delay is a validation query over missing or inconsistent drawings, so we prepare Ealing submissions to the council's validation checklist — correctly scaled existing and proposed plans, elevations and a location plan — to avoid that back-and-forth.
Can you help with a loft conversion on a 1930s Ealing semi?+
Yes. Ealing's Metro-land semis in Perivale, Greenford and Northolt suit hip-to-gable and dormer loft conversions, which frequently qualify as permitted development on semi-detached homes within the volume limits. We confirm eligibility against those limits and any Article 4 or conservation constraint, then produce the planning and building-regulations drawings.
How much do planning drawings cost in Ealing?+
We work to a fixed fee agreed before we start, typically around 30% below an architect's charge for the same council-accepted drawings, with free redraws until Ealing grants approval. The exact figure depends on the project — a single-storey rear extension differs from a double-storey or a loft — so we quote once we understand your scheme rather than on an open-ended hourly basis.
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