Loft conversion bedroom with rooflights in an Earlsfield SW18 Victorian terrace, London Borough of Wandsworth

Earlsfield · SW18 · Wandsworth

Rear Extension Drawings in Earlsfield SW18

Fixed-fee, MCIAT-chartered rear extension drawings for Earlsfield (SW18) homeowners — London Borough of Wandsworth validation and local constraints handled from the start.

Earlsfield (SW18) is one of Wandsworth's most uniform late-Victorian and Edwardian terraced neighbourhoods, sitting between Garratt Lane and Wandsworth Common. Because so many houses share the same footprint, the borough's design expectations for side-return, rear and loft projects here are well established — meeting them first time is straightforward when the drawings follow Wandsworth's residential extension guidance.

The main designated control is the Wandsworth Common conservation area along the western edge, where roofline changes and dormers face tighter assessment than on the surrounding streets. We check where an Earlsfield property sits relative to that boundary, and whether it backs the railway, before recommending a permitted-development or full-application route.

Proposed floor plan

Earlsfield SW18

Earlsfield (SW18) — planning at a glance

Council: London Borough of Wandsworth
Postcode district: SW18
Planning portal: View the Wandsworth planning portal
Housing stock: Long runs of late-Victorian and Edwardian terraces on the 'Magdalen' and Tonsleys streets between Garratt Lane and Wandsworth Common, with Edwardian mansion flats and railway-side plots around Earlsfield station.
Article 4: London Borough of Wandsworth does not publish its Article 4 directions to the national planning register, so permitted development rights in Earlsfield (SW18) 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. The Wandsworth Common and Wandsworth Town conservation areas and the consistent terraced grain are the main local controls.
Conservation: Wandsworth CommonWandsworth Town
Sample streets: Garratt Lane · Magdalen Road · Trewint Street · Penwith Road
Local constraints: Wandsworth Common conservation area along the western edge of the district, controlling rooflines and materialsA highly consistent terraced house type where Wandsworth's side-return and rear-extension depth expectations are well establishedMature street trees carrying Tree Preservation Orders on several roads, plus constrained railway-side plots near the Earlsfield line

Planning in Earlsfield (SW18): what to know before you apply

SW18 has no borough-wide householder Article 4 direction, so many Earlsfield houses retain permitted development rights for rear and loft work — but the Wandsworth Common conservation area is the exception, and the consistent terraced grain means Wandsworth has clear, well-documented expectations for side-return and rear depth.

Typical Earlsfield housing stock

Long runs of late-Victorian and Edwardian terraces on the 'Magdalen' and Tonsleys streets between Garratt Lane and Wandsworth Common, with Edwardian mansion flats and railway-side plots around Earlsfield station.

Streets we regularly draw for in Earlsfield

Garratt Lane · Magdalen Road · Trewint Street · Penwith Road

Rear Extension Drawings for Earlsfield (SW18) homes: the package and the process

Every rear extension drawings we prepare for an Earlsfield property is drawn to London Borough of Wandsworth’s validation standards and tuned to the SW18 constraints above. Here is what the drawing package covers and how the process runs from first survey to approval.

A single-storey rear extension is the most common way London homeowners add space, usually taking the form of an open-plan kitchen-diner that opens onto the garden through bi-fold or sliding doors, with rooflights or a roof lantern bringing daylight deep into the plan. Because depth and height are tightly controlled by permitted development rules and by the 45-degree rule that protects neighbouring windows, the design work sits as much in checking what the council will allow as in drawing what you want.

DrawingsDirect draws rear extensions for permitted development, the larger home extension prior-approval scheme and full householder planning, with structural calculations for the opening and roof produced in-house by our MCIAT-chartered team. If your project also involves widening the kitchen sideways or adding a second storey, see our Side Return, Wraparound and Double Storey Extension pages — many London rear extensions grow into one of those during design.

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.

Rear extension routes at a glance
Route	When it applies	Typical fee
Permitted development (Lawful Development Certificate)	Depth within 3m (terraced/semi) or 4m (detached), height and materials within PD limits	PD/LDC pack ~£950–£1,450
Larger home extension (prior approval)	Depth up to 6m (terraced/semi) or 8m (detached), with neighbour notification	from £1,100
Full householder planning permission	Extension exceeds PD/larger-home limits, or the property is in a conservation area with an Article 4 direction	Full Planning pack ~£1,600–£2,400
Planning + Building Regulations (structural)	Combined planning and construction-ready pack with structural calculations for the opening and roof	Planning + Building Regs pack ~£2,200–£3,850

Also in Earlsfield SW18

Planning Permission Planning Drawings Architectural Drawings Building Regulations Drawings Loft Conversion Drawings Rear Extension Drawings across Wandsworth Rear Extension Drawings across London

FAQ

Rear Extension Drawings in Earlsfield SW18 — 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 Wandsworth?+

On many of Wandsworth's Victorian terraces a single-storey side-return or rear extension can fall within permitted development, so a full application isn't always required. Conservation areas such as Wandsworth Common and Nightingale Lane, and the 'between the commons' streets, can restrict this. We check your street's designation first and can secure a Lawful Development Certificate where the work is permitted development.

What does Wandsworth's basement Article 4 direction mean for me?+

In parts of Wandsworth an Article 4 direction removes permitted development for basement works, and the council requires a Basement Impact Assessment covering structural stability, drainage and groundwater. If you are considering a basement or lower-ground extension we flag whether the direction applies to your address early, and coordinate the structural input so the application is complete when submitted.

How long will Wandsworth take to decide my application?+

Wandsworth determines most householder applications within the statutory eight-week window once the submission is validated. Because the terraced grids around the commons are party-wall-sensitive and design expectations are well established, the commonest delay is a drawing query — so we prepare Wandsworth submissions to the validation checklist to keep them moving.

Can you design an extension for a converted flat near the commons?+

Yes. Much of Battersea and the streets around Clapham and Wandsworth Commons are mansion blocks and converted flats, where ownership, lease and party-wall considerations shape what is deliverable alongside the planning route. We confirm the ownership and structural context before drawing, and coordinate the calculations in-house so party-wall-sensitive schemes are handled cleanly.

How much do Wandsworth planning drawings cost?+

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 Wandsworth approves. The price depends on the scheme — a side-return differs from a mansard loft or a basement — so we quote once we have seen your project rather than charging by the hour.

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