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Free 2026 London Planning Report — Double Storey Extension Drawings in South Norwood SE25

Rear dormer loft conversion on a Victorian terrace in South Norwood SE25, London Borough of Croydon
South Norwood · SE25 · Croydon

Double Storey Extension Drawings in South Norwood SE25

Fixed-fee, MCIAT-chartered double storey extension drawings for South Norwood (SE25) homeowners — Croydon Council validation and local constraints handled from the start.

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South Norwood (SE25) in Croydon is a Victorian neighbourhood built around its High Street and South Norwood Lake, with a conservation area covering the historic centre. The consistent Victorian terraces make rear and loft projects the staple, following a well-established local pattern.

The South Norwood conservation area controls frontages and rooflines in the centre, while the wider terraced streets are assessed for their consistent Victorian character, so dormer and elevation changes need to fit the established grain. We design South Norwood schemes to Croydon's residential guidance, checking the conservation-area boundary first.

Rear dormer loft conversion on a Victorian terrace in South Norwood SE25, London Borough of Croydon
Isometric illustration of a South Norwood SE25 home double storey extension drawings design
Proposed floor plan
South Norwood SE25

Planning in South Norwood (SE25): what to know before you apply

SE25 has no householder Article 4 direction, so many South Norwood houses retain permitted development rights for rear and loft work — but the South Norwood conservation area controls the historic centre, and the consistent Victorian terrace frontages mean dormer and elevation changes are judged closely against the established pattern. Event days at nearby Selhurst Park are a practical local access consideration.

Typical South Norwood housing stock

Victorian terraces on the streets around South Norwood High Street and South Norwood Lake, with later interwar and post-war housing toward Selhurst and Woodside.

Streets we regularly draw for in South Norwood

Portland Road · South Norwood High Street · Selhurst Road · Enmore Road

Double Storey Extension Drawings for South Norwood (SE25) homes: the package and the process

Every double storey extension drawings we prepare for an South Norwood property is drawn to Croydon Council’s validation standards and tuned to the SE25 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 South Norwood SE25

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

Double Storey Extension Drawings in South Norwood SE25 — 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 an extension in Croydon?+
It depends where in the borough you are. The interwar semis and detached homes of Purley, Sanderstead and Coulsdon often keep fuller permitted development rights than inner-London terraces, so larger rear and single-storey extensions can qualify. Conservation areas such as Addiscombe and South Norwood, and HMO Article 4 wards, restrict this. We check your address first and can confirm permitted development with a Lawful Development Certificate.
Can I build a larger extension on a Purley or Sanderstead plot?+
Often, yes. Croydon's generous suburban plots make substantial rear and double-storey extensions viable where a tight terrace could not accommodate them. 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, checking the limits for detached and semi-detached homes first.
What do Croydon's HMO Article 4 directions mean for me?+
In designated wards, an Article 4 direction removes permitted development for change of use to an HMO (C3 to C4), so a conversion to a house in multiple occupation needs a full application there. It doesn't affect a standard family extension, but if you are considering an HMO we confirm whether the direction covers your address and use before advising on a route.
How long does Croydon Council take to decide?+
Croydon determines most householder applications within the statutory eight-week period once validated. As a large borough spanning terraces to suburban plots, a complete, correctly scaled submission is the best way to avoid a validation query — we prepare Croydon drawings to the council's checklist to keep the application on track.
How much do planning drawings cost in Croydon?+
We quote a fixed fee upfront, typically around 30% below an architect's charge for the same council-accepted drawings, with free redraws until Croydon 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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