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Free 2026 London Planning Report — Rear Extension Drawings in Highgate N6

Basement conversion drawings for a Victorian villa in Highgate N6, London Borough of Camden
Highgate · N6 · Camden

Rear Extension Drawings in Highgate N6

Fixed-fee, MCIAT-chartered rear extension drawings for Highgate (N6) homeowners — London Borough of Camden validation and local constraints handled from the start.

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Highgate (N6) sits on the hill above Camden with two overlapping conservation areas — Highgate and Highgate Village — covering the historic core of Georgian houses and Victorian villas along the High Street and Southwood Lane. It is one of the few London districts where the topography is a planning constraint in its own right, not just a construction one.

Camden's Basements Article 4 direction applies here, which removes permitted development rights for basement works and means any lower-ground scheme in N6 needs a full planning application supported by proper drawings. Add the steep slopes toward Swains Lane, the mature tree cover through the village, and the conservation-area control over frontages and rooflines, and Highgate projects need level and tree information on the drawings from the outset. We survey the slope and check the conservation-area boundary before designing to Camden's guidance.

Basement conversion drawings for a Victorian villa in Highgate N6, London Borough of Camden
Isometric illustration of a Highgate N6 home rear extension drawings design
Proposed floor plan
Highgate N6

Planning in Highgate (N6): what to know before you apply

N6 is covered by Camden's Basements Article 4 direction, so permitted development rights for basement works are removed and a full application is required — a material difference from most outer-London districts. The Highgate and Highgate Village conservation areas control the historic core's frontages, rooflines and materials, while the Highgate Hill topography and the village's mature tree cover mean level changes, retaining structures and tree protection are routinely assessed on N6 householder schemes.

Typical Highgate housing stock

Georgian houses and Victorian villas around Highgate High Street and Southwood Lane, with substantial detached and semi-detached stock on the slopes toward Swains Lane and Hampstead Lane.

Streets we regularly draw for in Highgate

Highgate High Street · Southwood Lane · Swains Lane · Hampstead Lane

Rear Extension Drawings for Highgate (N6) homes: the package and the process

Every rear extension drawings we prepare for an Highgate property is drawn to London Borough of Camden’s validation standards and tuned to the N6 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
RouteWhen it appliesTypical fee
Permitted development (Lawful Development Certificate)Depth within 3m (terraced/semi) or 4m (detached), height and materials within PD limitsPD/LDC pack ~£950–£1,450
Larger home extension (prior approval)Depth up to 6m (terraced/semi) or 8m (detached), with neighbour notificationfrom £1,100
Full householder planning permissionExtension exceeds PD/larger-home limits, or the property is in a conservation area with an Article 4 directionFull Planning pack ~£1,600–£2,400
Planning + Building Regulations (structural)Combined planning and construction-ready pack with structural calculations for the opening and roofPlanning + Building Regs pack ~£2,200–£3,850

Also in Highgate N6

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FAQ

Rear Extension Drawings in Highgate N6 — 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 rear extension in Camden?+
Frequently, yes. Much of Camden sits within a conservation area or is listed, and near-borough-wide conservation coverage removes permitted development for many external works. On unlisted homes outside a conservation area a rear extension may still qualify, but in Hampstead, Belsize Park and Primrose Hill a full application is usually needed. We confirm the exact constraints for your address before drawing.
What is a Basement Impact Assessment and will I need one in Camden?+
Camden operates one of the most rigorous basement policies in London. Schemes involving a basement or lower-ground extension generally require a Basement Impact Assessment addressing structural stability, drainage and groundwater. If you are considering below-ground space we flag the requirement early and coordinate the assessment so the application is complete when it is submitted.
Can I make changes to a listed building in Camden?+
Often, but listed-building consent is usually required alongside — or instead of — planning permission, and internal as well as external changes can be controlled. Camden has a high density of listed buildings in Hampstead, Bloomsbury and Fitzrovia. We screen listing status for your address first and prepare the heritage-led drawings and justification the council expects.
How long does Camden take to decide an application?+
Camden determines most householder applications within the statutory eight-week period once validated; basement, conservation and listed-building cases can involve additional consultation. We prepare Camden submissions to the council's validation and design standards to avoid the drawing queries that cause most delays.
How much do planning drawings cost in Camden?+
We agree a fixed fee before we start, typically around 30% below an architect's fee for the same council-accepted drawings, with free redraws until Camden approves. A conservation-area rear extension, a basement and a listed-building scheme differ in the evidence required, so we quote once we have seen your project rather than by the hour.
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