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Free 2026 London Planning Report — Side Return Extension Drawings in Bexleyheath DA6

Loft conversion with skylights in an inter-war Bexleyheath DA6 semi, London Borough of Bexley
Bexleyheath · DA6 · Bexley

Side Return Extension Drawings in Bexleyheath DA6

Fixed-fee, MCIAT-chartered side return extension drawings for Bexleyheath (DA6) homeowners — London Borough of Bexley validation and local constraints handled from the start.

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Bexleyheath (DA6) grew up as an inter-war and post-war suburb around the Broadway shopping centre, so most of its housing is 1920s-1950s semi-detached and detached stock where loft conversions and rear extensions are the staple jobs. The bulk of the district sits outside any conservation area, which keeps many householder projects within permitted-development limits.

The exceptions are two nationally important heritage sites: the Red House Lane Conservation Area protecting William Morris's 1859 Arts-and-Crafts house off Upton Road, and Danson Park with its Grade II registered landscape and Georgian Danson House. Work near those boundaries, and to any listed building, is assessed far more tightly than on the surrounding suburban streets.

Loft conversion with skylights in an inter-war Bexleyheath DA6 semi, London Borough of Bexley
Isometric illustration of a Bexleyheath DA6 home side return extension drawings design
Proposed floor plan
Bexleyheath DA6

Planning in Bexleyheath (DA6): what to know before you apply

Most DA6 householder work sits outside any conservation area and can proceed under permitted development, but projects near the Red House Lane Conservation Area or the Danson Park registered landscape are judged on their impact on those settings and usually need a full application. Because Bexley applies Article 4 directions to some but not all of its conservation areas, we confirm on the council's conservation map whether a specific property is caught before assuming permitted-development rights survive.

Typical Bexleyheath housing stock

Bexleyheath is dominated by inter-war and post-war semi-detached and detached suburban housing laid out around the Broadway, punctuated by two national heritage anchors — Philip Webb's red-brick Red House of 1859-60 off Upton Road and the Georgian Danson House in its Grade II registered parkland.

Streets we regularly draw for in Bexleyheath

Red House Lane · Upton Road · Danson Road · Long Lane

What DA6 is actually built of

Measured from 227 classified residential buildings in DA6, not from a description of the area.

Bexleyheath DA6 housing mix

Residential building form across the DA6 postcode district, from 227 classified buildings.

Attached on more than one side28%
Attached on one side60%
Detached12%
Median building footprint69 m²
Addresses per buildingAbove about 2 means flats and maisonettes dominate1.26
Buildings classified227

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 Bexleyheath (DA6) 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
PackageWhat it coversTypical fee
Side return, planning onlyFull householder planning application drawings for the infillFull Planning pack ~£1,600–£2,400
Side return, planning + Building RegulationsAdds structural calculations, Party Wall drawings and construction detailPlanning + Building Regs pack ~£2,200–£3,850
Side return + rear extension (wraparound)Combines both extensions into one L-shaped ground floorsee Wraparound Extension Drawings
Measured survey onlyA measured existing floor-plan set for your own architect, surveyor or builderfrom £450
Sheet from a side return extension drawings package drawn for a Bexleyheath property in DA6, showing the existing and proposed arrangement at scale
A sheet from the side return extension drawings package we submit to London Borough of Bexley for Bexleyheath (DA6) properties.

Also in Bexleyheath DA6

Planning PermissionPlanning DrawingsArchitectural DrawingsBuilding Regulations DrawingsLoft Conversion DrawingsSide Return Extension Drawings across BexleySide Return Extension Drawings across London
FAQ

Side Return Extension Drawings in Bexleyheath DA6 — 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 an extension in Bexley?+
Bexley has no borough-wide Article 4 direction affecting typical householder permitted development, so its semi-detached homes often keep fuller rights than inner-London terraces — larger rear and single-storey extensions can qualify. Conservation areas such as Old Bexley Village and Danson Park, and riverside flood-zone constraints toward Erith, restrict this. We check your address first and can confirm permitted development with a Lawful Development Certificate.
Can I build a bigger extension because Bexley plots are larger?+
Often, yes. The generous interwar plots across Bexleyheath, Sidcup and Welling make substantial rear and double-storey extensions viable where a tight terrace could not. The limit is usually design and amenity policy rather than space. We design to use the plot fully within permitted-development allowances or a well-evidenced full application.
What extra control applies in Old Bexley Village or around Danson Park?+
These conservation areas carry design control over materials, rooflines and front elevations, and the Upton area of Bexleyheath includes the setting of William Morris's Red House. Permitted development is often restricted there, so we design to the area's character and prepare a full, context-led application where a standard permitted-development route doesn't apply.
How long does Bexley Council take to decide?+
Bexley determines most householder applications within the statutory eight-week period once validated; conservation cases can involve additional consultation. A complete, correctly scaled submission is the best way to avoid a validation query — we prepare Bexley drawings to the council's checklist to keep the application on track.
How much do planning drawings cost in Bexley?+
We quote a fixed fee upfront, typically around 30% below an architect's charge for the same council-accepted drawings, with free redraws until Bexley approves. Because plots here allow larger schemes, the fee tracks complexity — a single-storey rear differs from a double-storey — and we confirm it once we understand your plans.
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