Single-storey rear extension onto a deep garden behind an interwar West Wickham BR4 semi-detached house in Bromley

West Wickham · BR4 · Bromley

Rear Extension Drawings in West Wickham BR4

Fixed-fee, MCIAT-chartered rear extension drawings for West Wickham (BR4) homeowners — London Borough of Bromley validation and local constraints handled from the start.

West Wickham (BR4) is a classic interwar railway suburb: once Kent farmland, it was laid out for London commuters after the station opened, and its character today is overwhelmingly 1920s–1930s semi-detached and detached houses on generous, planned plots. Almost every householder project here is a rear extension, side infill or loft on one of those suburban houses, so drawings need to sit comfortably within wide, evenly spaced streets.

There is no conservation area covering West Wickham — that is a genuine, verified fact, not an omission. Its planning character is instead shaped by the consistency of the interwar suburb: regular building lines, front-garden setbacks and the spacing between houses, all read against Bromley's householder design expectations. We treat that suburban grain, rather than a conservation designation, as the reference point when we design an extension.

Because the plots are deep and the layout is so regular, demand for rear extensions and loft conversions is steady along roads like Wickham Chase, Pickhurst Rise and Red Lodge Road. We check each property's permitted-development position against Bromley's borough-wide controls first, then prepare drawings that either stay within permitted development or are ready to validate as a full householder application.

Proposed floor plan

West Wickham BR4

West Wickham (BR4) — planning at a glance

Council: London Borough of Bromley
Postcode district: BR4
Planning portal: View the Bromley planning portal
Housing stock: Predominantly 1920s–1930s semi-detached and detached houses on wide, planned suburban roads, with some later postwar infill. The generous plots and deep rear gardens that came with garden-suburb-influenced planning are exactly what make rear extensions and loft conversions such common projects here.
Article 4: No area-specific Article 4 direction is published for West Wickham; the London Borough of Bromley's borough-wide permitted-development controls and householder design guidance still apply.
Sample streets: Wickham Chase · The Avenue · The Drive · Pickhurst Rise · Red Lodge Road · Langley Way · Wickham Court Road · Corkscrew Hill · Ash Road · Bushey Road · Links View Road · Manor Park Road
Local constraints: Consistent interwar suburban rhythm: the regular building lines, gaps between semi-detached pairs and front-garden setbacks mean a side or front-facing addition is judged against a settled street pattern rather than a one-off houseBromley's borough-wide permitted-development limits and householder design guidance govern extension depth, height and roof form — no local Article 4 direction narrows those rights further in West WickhamMatching original facing brick, render, tile-hanging and roof tiles so a rear or side extension reads as part of the original interwar house rather than an obvious additionPreserving the gap between semi-detached and detached pairs: two-storey side extensions that close a characteristic gap can harm the spacious suburban grain the area is known forGenerous plots give scope for deeper single-storey rear extensions, but larger schemes still need to respect neighbour amenity — overshadowing, overlooking and party-wall relationships with the adjoining houseLoft conversions on the standard interwar roof form are common, though front-facing dormers and roof changes are assessed for their effect on the uniform roofscape

Planning in West Wickham (BR4): what to know before you apply

Bromley assesses West Wickham extensions against the settled interwar suburban pattern, so matching original brick, render and roof form and respecting the gaps between houses matters more than on a mixed-typology road. There is no conservation area and no local Article 4 direction, so many houses retain permitted development rights for rear and loft work — but two-storey side additions, roof changes and neighbour amenity are the points a householder application is judged on.

Typical West Wickham housing stock

Predominantly 1920s–1930s semi-detached and detached houses on wide, planned suburban roads, with some later postwar infill. The generous plots and deep rear gardens that came with garden-suburb-influenced planning are exactly what make rear extensions and loft conversions such common projects here.

Streets we regularly draw for in West Wickham

Wickham Chase · The Avenue · The Drive · Pickhurst Rise · Red Lodge Road · Langley Way · Wickham Court Road · Corkscrew Hill · Ash Road · Bushey Road · Links View Road · Manor Park Road

What BR4 is actually built of

Measured from 287 classified residential buildings in BR4, not from a description of the area.

West Wickham BR4 housing mix

Residential building form across the BR4 postcode district, from 287 classified buildings.

Attached on more than one side	23%
Attached on one side	59%
Detached	17%
Median building footprint	84 m²
Addresses per buildingAbove about 2 means flats and maisonettes dominate	1.06
Buildings classified	287

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.

Rear Extension Drawings for West Wickham (BR4) homes: the package and the process

Depth is the number the application turns on, and it has to be measured from the original rear wall of the house rather than from whatever is there now. The drawings carry that dimension, the eaves and ridge heights, the position of any rooflight, and the boundary distances on both sides.

Where the scheme goes beyond the standard allowance and relies on the larger home extension route, the drawings serve a second purpose: they are what the council sends to the neighbours during the consultation. A clear, dimensioned proposed elevation answers the objection about overshadowing before it is made.

Depth is limited by the plot as much as by the rules. A long garden behind a terrace can take the full allowance, while a short one runs out before the rules do — and on a semi or detached house the same depth reads very differently from the boundary.

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.

Designing the kitchen-diner: rooflights, bi-folds and daylight

Most rear extensions exist to create one open-plan kitchen, dining and living space, so the drawing work focuses on getting light and flow right within the depth you are allowed.

Structural opening sized for bi-fold or sliding doors across most of the rear elevation
Rooflights or a roof lantern positioned to light the centre of the room, away from the shadow line of the main house
Open-plan layout tested against the 45-degree rule, which protects daylight to your neighbours' windows and can limit how close a flank wall or roof comes to the boundary
Floor build-up and threshold detail coordinated so the new floor meets the existing one without a step

Rear extension routes at a glance
Route	When it applies	Typical fee
Permitted development (Lawful Development Certificate)	Depth within 3m (terraced/semi) or 4m (detached), height and materials within PD limits	PD/LDC pack ~£950–£1,450
Larger home extension (prior approval)	Depth up to 6m (terraced/semi) or 8m (detached), with neighbour notification	from £1,100
Full householder planning permission	Extension exceeds PD/larger-home limits, or the property is in a conservation area with an Article 4 direction	Full Planning pack ~£1,600–£2,400
Planning + Building Regulations (structural)	Combined planning and construction-ready pack with structural calculations for the opening and roof	Planning + Building Regs pack ~£2,200–£3,850

Sheet from a rear extension drawings package drawn for a West Wickham property in BR4, showing the existing and proposed arrangement at scale — A sheet from the rear extension drawings package we submit to London Borough of Bromley for West Wickham (BR4) properties.

Also in West Wickham BR4

Planning Permission Planning Drawings Architectural Drawings Building Regulations Drawings Loft Conversion Drawings Rear Extension Drawings across Bromley Rear Extension Drawings across London

FAQ

Rear Extension Drawings in West Wickham BR4 — 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 to extend a house in West Wickham?+

Not always. Many West Wickham houses retain permitted development rights, so a single-storey rear extension or a rear loft conversion can often proceed without a full planning application. Because the interwar plots and building lines are regular, we check your property's limits against Bromley's controls first and prepare a full householder application where the project — such as a two-storey side extension — goes beyond permitted development.

Is West Wickham in a conservation area?+

No. There is no conservation area covering West Wickham. Its planning character is shaped instead by the consistency of the interwar railway suburb — the regular building lines, front-garden setbacks and gaps between houses — and by Bromley's householder design expectations, which favour keeping that spacious suburban grain when you extend.

How much do planning and building-regulation drawings cost for a West Wickham extension?+

We work to fixed fees agreed before we start, with a typical turnaround of around seven days for a standard rear extension or loft on a West Wickham house. As a chartered architectural technologist practice we produce the same council-accepted planning and building-regulation drawings as an architect, usually for a lower fee, and include free redraws until your application is approved.

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.

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