House Extension Drawings in Dulwich SE21
Fixed-fee, MCIAT-chartered house extension drawings for Dulwich (SE21) homeowners — London Borough of Southwark validation and local constraints handled from the start.
Dulwich (SE21) in Southwark is one of London's most distinctive planning contexts: a low-density landscape of Georgian and Victorian villas around Dulwich Village, much of it still held on leases from the Dulwich Estate. Extensions and loft conversions here are shaped as much by that estate control as by the planning system.
The Dulwich Village conservation area closely governs rooflines, materials and front elevations, and — unusually — the Dulwich Estate's Scheme of Management requires the Estate's own consent for external alterations on top of any planning permission. We flag both routes before drawing, so a Dulwich scheme clears the conservation area and the Estate together.
Planning in Dulwich (SE21): what to know before you apply
SE21's defining controls are the Dulwich Village conservation area and the Dulwich Estate Scheme of Management — the latter a private control requiring the Estate's consent for external alterations regardless of permitted development rights. Many Dulwich owners are surprised that a project which is permitted development for planning purposes can still need Estate approval, so we check both from the outset.
Typical Dulwich housing stock
Georgian houses and shopfronts along Dulwich Village itself, substantial Victorian and Edwardian villas on College Road, Court Lane and Calton Avenue, and later 20th-century estate housing — much of it still on Dulwich Estate leases.
Streets we regularly draw for in Dulwich
Dulwich Village · College Road · Court Lane · Calton Avenue
What SE21 is actually built of
Measured from 229 classified residential buildings in SE21, not from a description of the area.
Dulwich SE21 housing mix
Residential building form across the SE21 postcode district, from 229 classified buildings.
| Attached on more than one side | 38% |
|---|---|
| Attached on one side | 50% |
| Detached | 13% |
| Median building footprint | 80 m² |
| Addresses per buildingAbove about 2 means flats and maisonettes dominate | 1.44 |
| Buildings classified | 229 |
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.
House Extension Drawings for Dulwich (SE21) homes: the package and the process
Extension drawings are read for their dimensions. The proposed plan needs depth measured from the original rear wall — not from a previous extension — eaves and ridge heights taken from existing ground level, and the distance to each boundary marked. A site plan showing how much garden remains is what an officer reaches for when the amenity question comes up.
We draw the existing building accurately first, because everything else is measured from it. Where the original footprint has already been added to, that history goes on the drawing: it decides which allowances are still available and it is the first thing an officer checks against the council's own records.
The plot decides the extension type long before taste does. A mid-terrace has depth to work with and an alley if it is lucky; a semi has one clear flank; a detached house can go wide. Reading the building form first is what stops a design being drawn that the plot cannot take.
Which extension types do you draw?
Every London extension is shaped by the plot, the neighbours and the borough's design guidance. We draw them all.
Rear extension
A single-storey rear extension is often permitted development within depth limits — ideal for an open-plan kitchen-diner.
Side-return
Fills the alley beside a Victorian terrace, widening the ground floor without losing garden.
Wraparound
Combines a rear and side-return extension for a transformative ground floor, usually needing planning permission.
Double-storey
Adds space above and below, subject to tighter scale and neighbour-impact scrutiny.
Basement
Creates space downward where footprint is limited, with structural and party-wall care.
Do I need planning permission for a house extension in London?
Single-storey rear extensions within permitted development limits (up to 6m for terraced/semi-detached homes under the larger-home scheme, subject to neighbour consultation) may not need a full application. Wraparounds, double-storeys and anything in a conservation area usually do. We assess your plot and recommend the right route before drawing. The current depth, height and eaves limits are set out in full in the guide to planning permission for a rear extension, and where you would rather one practice ran the design, the application and the building-regulations stage together, Architectural Drawings covers that full scope.
How do you maximise the footprint the council will approve?
We know each borough's depth, height and daylight standards, so we design to the edge of what will be approved rather than guessing — and we check the 45-degree neighbour daylight rule and any rear building line before submission. Where a plot is tight we test a permitted-development scheme against a slightly larger householder application and show you the trade-off in space, cost and timescale, so the drawn scheme is the one that actually maximises value rather than just floor area.
| Extension | Typical route | Package | Fee from |
|---|---|---|---|
| Single-storey rear | Permitted development / householder | Planning + building regs | £1,100 |
| Side-return | Householder planning | Planning + building regs + structural | £1,600 |
| Wraparound | Householder planning | Full package + structural | £2,200 |
| Double-storey | Householder planning | Full package + structural | £2,400 |
House Extension Drawings in Dulwich SE21 — FAQs
How far can I extend without planning permission in London?+
Do extension drawings include structural calculations?+
How long do extension drawings take?+
Will my rear extension need a party wall agreement?+
Can I extend a house in a conservation area?+
Do I need planning permission for an extension in Southwark?+
What is the Dulwich Estate scheme of management?+
Can you handle a warehouse or riverside conversion in Bermondsey or Bankside?+
How long does Southwark Council take to decide?+
How much do planning drawings cost in Southwark?+
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