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Free 2026 London Planning Report — Double Storey Extension Drawings in Brixton Hill SW2

Single-storey rear extension behind a Brixton Hill SW2 Victorian terrace in the London Borough of Lambeth
Brixton Hill · SW2 · Lambeth

Double Storey Extension Drawings in Brixton Hill SW2

Fixed-fee, MCIAT-chartered double storey extension drawings for Brixton Hill (SW2) homeowners — London Borough of Lambeth validation and local constraints handled from the start.

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Brixton Hill (SW2) runs up the ridge between Brixton and Streatham Hill in Lambeth, and its Victorian terraces and villas make side-return, rear and loft projects the most common work here. The Rush Common & Brixton Hill conservation area governs frontages and rooflines along much of the hill, so where a property sits relative to that boundary shapes how an extension or loft is designed and assessed.

SW2 also carries an unusual historic control: the Rush Common Act restricts building on the old open land in front of houses on the east side of Brixton Hill, which can affect front additions and boundary work on those plots. We check both the conservation boundary and the Rush Common frontage before recommending a permitted-development or full-application route, and prepare the drawings to Lambeth's residential design and validation standards.

Single-storey rear extension behind a Brixton Hill SW2 Victorian terrace in the London Borough of Lambeth
Isometric illustration of a Brixton Hill SW2 home double storey extension drawings design
Proposed floor plan
Brixton Hill SW2

Planning in Brixton Hill (SW2): what to know before you apply

SW2 has no borough-wide householder Article 4 direction, so many Brixton Hill houses retain permitted development rights — but the Rush Common & Brixton Hill conservation area is the exception, and the historic Rush Common Act frontage restriction is a genuine local quirk on the east side of the hill that we check before drawing.

Typical Brixton Hill housing stock

Victorian terraces climbing Brixton Hill toward Streatham Hill, larger semi-detached and detached villas on the higher ground, mansion blocks and purpose-built flats along the main road, and postwar estates in pockets.

Streets we regularly draw for in Brixton Hill

Brixton Hill · Blenheim Gardens · Josephine Avenue · New Park Road

Double Storey Extension Drawings for Brixton Hill (SW2) homes: the package and the process

Every double storey extension drawings we prepare for an Brixton Hill property is drawn to London Borough of Lambeth’s validation standards and tuned to the SW2 constraints above. Here is what the drawing package covers and how the process runs from first survey to approval.

A double storey extension builds a second floor above a single-storey side or rear addition, typically adding a bedroom and bathroom upstairs over a widened kitchen or reception room below. Because the foundations and roof of a single-storey extension already carry most of the fixed cost of building, adding a floor on top is often the most cost-effective way to gain two rooms rather than two separate projects. The trade-off is scrutiny: a two-storey addition sits closer to eye level with neighbouring windows and gardens, so councils examine massing, roofline and boundary distance more closely than they would a single-storey extension.

DrawingsDirect draws double storey side and rear extensions for full planning and building regulations, with structural calculations for the additional floor load and foundations produced in-house by our MCIAT-chartered team, on a fixed fee. If a single storey is enough, see our Rear Extension and Side Return Extension pages, or combine both with a Wraparound if you are extending sideways as well as up.

Do I need planning permission for a double storey extension in London?

Almost always. Permitted development rights for two-storey extensions are far more restrictive than for single-storey work, particularly on how close the new structure can come to a boundary and how closely its roof pitch and eaves height must match the existing house, so most double storey projects are drawn and submitted as full householder planning applications rather than relying on permitted development.

Where the property sits in a conservation area or is subject to an Article 4 direction, any remaining permitted development allowance for a second storey is typically removed entirely, reinforcing the need for a full application. We check your property's status and your borough's design guidance before drawing.

How do councils control the impact of a double storey extension on neighbours?

Because a second storey introduces new windows and massing at first-floor level, London boroughs apply design guidance aimed specifically at protecting neighbouring light, privacy and outlook.

  • The 45-degree rule, tested at neighbouring windows, to check the extension does not block an unreasonable amount of daylight
  • A common design expectation that a two-storey side extension is set in roughly 1 metre from the shared boundary, rather than built hard against it
  • A first floor commonly set back from the ground floor front elevation, so the upper storey reads as subordinate to the main house from the street
  • Obscure or high-level glazing on flank walls facing directly into a neighbour's garden or windows, to limit overlooking
Extending once vs twice: single versus double storey
OptionWhat it addsTypical fee
Single-storey rear extensionA ground-floor kitchen-diner only, may qualify for permitted developmentsee Rear Extension Drawings, from £1,100
Double storey side or rear extensionTwo rooms across two floors, usually needs full planningFull Planning pack ~£1,600–£2,400
Double storey + Building Regulations (structural)Combined pack including structural calculations for two-floor loads and foundationsPlanning + Building Regs pack ~£2,200–£3,850
Wraparound (rear + side return)Combines two single-storey extensions into one L-shaped ground floorsee Wraparound Extension Drawings, from £2,200

Also in Brixton Hill SW2

Planning PermissionPlanning DrawingsArchitectural DrawingsBuilding Regulations DrawingsLoft Conversion DrawingsDouble Storey Extension Drawings across LambethDouble Storey Extension Drawings across London
FAQ

Double Storey Extension Drawings in Brixton Hill SW2 — FAQs

How much does a double storey extension cost to design in London?+
Double storey extension drawings start from £2,400, covering full planning permission and structural design for the additional floor. A combined planning and building regulations package with full structural calculations runs up to around £3,850, fixed and agreed upfront.
Do I need planning permission to add a second storey?+
In almost all cases, yes. Permitted development rights for two-storey extensions are much tighter than for single-storey work, particularly around boundary distance and roof matching, so we design double storey projects on the assumption a full householder planning application is required.
Will a double storey extension overlook my neighbour's garden?+
That is exactly what planning officers check, using the 45-degree daylight rule alongside boundary set-in and first-floor set-back guidance. Where a new flank window would look directly into a neighbour's garden, we typically specify obscure or high-level glazing to address it before submission rather than after an objection.
Do I need an architect for a double storey extension?+
No. DrawingsDirect is an MCIAT-chartered architectural technologist practice, producing the same council-accepted drawings and in-house structural coordination as an architect, for a fixed fee typically around 30% lower, with structural calculations for the additional floor produced by the same team rather than a separately appointed engineer.
How long does it take to get double storey extension drawings?+
Drawings are typically ready around 7 days from survey. A householder planning application then has a statutory 8-week determination period once submitted.
Do I need planning permission for a side-return extension in Lambeth?+
On many of Lambeth's Victorian and Edwardian terraces in Brixton, Clapham and Streatham, 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 Clapham Common and Brixton Water Lane can restrict this. We check your street's designation first and can confirm permitted development with a Lawful Development Certificate.
My Lambeth home is a converted flat — does that change things?+
It often does. Many Lambeth houses are converted flats, so ownership, lease and party-wall considerations can matter as much as the planning route, and the freeholder's agreement is usually needed alongside planning. We resolve the ownership and shared-structure context before drawing so the scheme is deliverable, not just consentable.
What does Lambeth's HMO Article 4 direction affect?+
Lambeth applies an Article 4 direction removing permitted development rights for HMO conversions (C3 to C4) in designated parts of the borough, so a change of use to a house in multiple occupation needs a full application there. It doesn't affect a standard family extension, but we confirm whether it applies to your address and use before advising on a route.
How long does Lambeth Council take to decide?+
Lambeth determines most householder applications within the statutory eight-week period once validated. The terraced grids around Clapham and Brixton are party-wall-sensitive with well-established design expectations, so the commonest delay is a drawing query — we prepare submissions to the borough's residential extension guidance to keep them moving.
How much do planning drawings cost in Lambeth?+
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 Lambeth approves. A side-return, a loft and a flat-conversion scheme differ in complexity, so we quote once we understand your street and project rather than charging by the hour.
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