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Free 2026 London Planning Report — House Extension Drawings in Bromley BR1

Rear extension behind a detached Edwardian villa in Bickley, Bromley BR1, London Borough of Bromley
Bromley · BR1 · Bromley

House Extension Drawings in Bromley BR1

Fixed-fee, MCIAT-chartered house extension drawings for Bromley (BR1) homeowners — London Borough of Bromley validation and local constraints handled from the start.

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Bromley (BR1) runs from the pedestrianised Market Square and High Street of the town centre out to the large detached villas of Bickley, mixing a busy commercial core with leafy Edwardian avenues. Rear extensions and loft conversions on the villa streets are the mainstay of our work here.

The Bromley Town Centre conservation area, designated in 1985, controls the historic Market Square end of the High Street, while the Sundridge Avenue and Mavelstone Road conservation areas towards Bickley protect wide-plot villas and their garden settings. We check a BR1 address against these before drawing to Bromley's residential guidance.

Rear extension behind a detached Edwardian villa in Bickley, Bromley BR1, London Borough of Bromley
Isometric illustration of a Bromley BR1 home house extension drawings design
Proposed floor plan
Bromley BR1

Planning in Bromley (BR1): what to know before you apply

BR1 carries no householder Article 4 direction — the borough's one such direction sits over the Chancery Lane conservation area in Beckenham (BR3) — so many Bromley houses keep permitted development rights for rear and loft work. But the Bromley Town Centre, Sundridge Avenue and Mavelstone Road conservation areas tighten control over frontages, rooflines and materials, and work to the large Bickley villas draws close design scrutiny, so we confirm the conservation-area position on the council's map first.

Typical Bromley housing stock

Large detached and semi-detached Edwardian villas on the leafy Bickley avenues, tighter Victorian terraces nearer the station, and the mixed commercial fabric around the pedestrianised Market Square and High Street of the town centre.

Streets we regularly draw for in Bromley

Market Square · Sundridge Avenue · Mavelstone Road · Page Heath Lane · Widmore Road

House Extension Drawings for Bromley (BR1) homes: the package and the process

Every house extension drawings we prepare for an Bromley property is drawn to London Borough of Bromley’s validation standards and tuned to the BR1 constraints above. Here is what the drawing package covers and how the process runs from first survey to approval.

A well-drawn extension adds space and value while sailing through the council; a poorly-drawn one triggers objections and refusals. DrawingsDirect draws rear, side-return, wraparound, double-storey and basement extensions for London homes — sized to your borough's tolerances, with daylight and neighbour impact considered before the planners raise them.

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.

Typical London extension drawing packages
ExtensionTypical routePackageFee from
Single-storey rearPermitted development / householderPlanning + building regs£1,100
Side-returnHouseholder planningPlanning + building regs + structural£1,600
WraparoundHouseholder planningFull package + structural£2,200
Double-storeyHouseholder planningFull package + structural£2,400

Also in Bromley BR1

Planning PermissionPlanning DrawingsArchitectural DrawingsBuilding Regulations DrawingsLoft Conversion DrawingsHouse Extension Drawings across BromleyHouse Extension Drawings across London
FAQ

House Extension Drawings in Bromley BR1 — FAQs

How far can I extend without planning permission in London?+
Under permitted development, single-storey rear extensions can reach 3m (terraced/semi) or 4m (detached), or up to 6–8m under the prior-approval larger-home scheme — but conservation areas and Article 4 directions can remove these rights. We check your property first.
Do extension drawings include structural calculations?+
Our full package includes structural drawings and calculations coordinated in-house, so your builder can price and build without waiting on an engineer.
How long do extension drawings take?+
Typically about 7 days from survey to a full drawing set delivered to your online portal.
Will my rear extension need a party wall agreement?+
If you build up to or on a shared boundary, excavate near a neighbour's foundations, or cut into a party wall for a steel, the Party Wall etc. Act 1996 usually applies. Our drawings show the works clearly so a party wall surveyor — or your neighbour — can see exactly what is proposed, which keeps that process quick.
Can I extend a house in a conservation area?+
Yes, but conservation areas and Article 4 directions commonly remove permitted development for rear and side extensions, so the work needs a full householder application designed to the council's heritage guidance. We confirm your property's designation before recommending a route.
Do I need planning permission for an extension in Bromley?+
Bromley has no borough-wide Article 4 direction affecting typical householder permitted development, so its detached and semi-detached homes often keep fuller rights than inner-London terraces — larger rear and single-storey extensions can qualify. The binding constraints are green-belt policy on outer properties and conservation control in Chislehurst, Keston and Bromley Town. We check both and can confirm permitted development with a Lawful Development Certificate.
Can I build a bigger extension because Bromley plots are larger?+
Often, yes. Bromley's generous interwar plots make substantial rear and double-storey extensions viable where an inner-London terrace could not accommodate them. The limit is usually policy rather than space — green belt restricts scale on outer properties, and conservation areas control design. We design to use the plot fully within those limits, checking permitted-development allowances for detached homes first.
How does green-belt designation affect my Bromley project?+
On green-belt properties toward Orpington, Chislehurst and the borough's edges, extensions are assessed against strict limits on disproportionate additions to the original dwelling. It does not rule out an extension, but scale and siting matter and the case must be evidenced carefully. We confirm whether your property is green belt and design a scheme that stays within policy.
How long does Bromley Council take to decide?+
Bromley determines most householder applications within the statutory eight-week period once validated. As London's largest borough by area, its casework spans suburban semis to green-belt properties, so a complete, correctly scaled submission is the best way to avoid a validation query and keep to that timescale.
How much do planning drawings cost in Bromley?+
We quote a fixed fee upfront, typically around 30% below an architect's charge for the same council-accepted drawings, with free redraws until Bromley approves. Because plots here allow larger schemes, the fee tracks the project's complexity — a single-storey rear differs from a double-storey or a green-belt case — and we confirm it once we understand your plans.
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