Rear extension behind a detached inter-war house in suburban Upminster RM14 in Havering

Upminster · RM14 · Havering

Rear Extension Drawings in Upminster RM14

Fixed-fee, MCIAT-chartered rear extension drawings for Upminster (RM14) homeowners — London Borough of Havering validation and local constraints handled from the start.

Upminster (RM14) runs from a leafy Edwardian and inter-war suburb down to Corbets Tey, a surviving medieval village and one of the three settlements that originally formed Upminster. The Corbets Tey Conservation Area protects that village character, its listed buildings and its countryside-edge setting, so work there faces close conservation-area control.

Across the wider suburb the housing is mostly detached and semi-detached homes on good-sized plots, and rear extensions, side infills, loft conversions and garden rooms are the usual projects. Havering's householder guidance sets clear expectations, and matching them in the drawings is what gets RM14 schemes through first time.

Proposed floor plan

Upminster RM14

Upminster (RM14) — planning at a glance

Council: London Borough of Havering
Postcode district: RM14
Planning portal: View the Havering planning portal
Housing stock: The Corbets Tey village group of listed and historic buildings on the edge of open countryside, surrounded by the Edwardian and inter-war detached and semi-detached housing that makes up most of suburban Upminster.
Article 4: London Borough of Havering does not publish its Article 4 directions to the national planning register, so permitted development rights in Upminster (RM14) can’t be confirmed from open data alone — we check the direction schedule with the council before recommending a route, as part of the fixed fee. No borough-wide Article 4 direction covers RM14 householder work; the Corbets Tey conservation-area control is the defining constraint.
Conservation: Corbets Tey
Sample streets: Corbets Tey Road · Harwood Hall Lane · Ockendon Road · Hall Lane
Local constraints: Corbets Tey Conservation Area — one of the three medieval settlements that formed Upminster, protecting its village character, the listed grade II group south of Harwood Hall Lane and the countryside-edge settingElevated village junction of Ockendon Road, Harwood Hall Lane and Corbets Tey Road where new build lines and heights are sensitiveGreen-belt and open-countryside edge to the south limiting how far development can extend beyond the built village

Planning in Upminster (RM14): what to know before you apply

No borough-wide Article 4 direction affects typical RM14 householder work, so many Upminster houses retain permitted development rights for rear and loft projects. The exception is the Corbets Tey Conservation Area, where the village character, listed group and countryside-edge setting mean external changes are controlled and permitted development is curtailed.

Typical Upminster housing stock

The Corbets Tey village group of listed and historic buildings on the edge of open countryside, surrounded by the Edwardian and inter-war detached and semi-detached housing that makes up most of suburban Upminster.

Streets we regularly draw for in Upminster

Corbets Tey Road · Harwood Hall Lane · Ockendon Road · Hall Lane

What RM14 is actually built of

Measured from 294 classified residential buildings in RM14, not from a description of the area.

Upminster RM14 housing mix

Residential building form across the RM14 postcode district, from 294 classified buildings.

Attached on more than one side	25%
Attached on one side	58%
Detached	17%
Median building footprint	82 m²
Addresses per buildingAbove about 2 means flats and maisonettes dominate	1.14
Buildings classified	294

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 Upminster (RM14) 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 Upminster property in RM14, showing the existing and proposed arrangement at scale — A sheet from the rear extension drawings package we submit to London Borough of Havering for Upminster (RM14) properties.

Also in Upminster RM14

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

FAQ

Rear Extension Drawings in Upminster RM14 — 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 an extension in Havering?+

Havering 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. Green-belt land toward the east and conservation areas such as Upminster and Emerson Park restrict this. We check your address first and can confirm permitted development with a Lawful Development Certificate.

How does green-belt land affect my Havering project?+

On green-belt properties toward the borough's eastern and northern 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.

Can I build a bigger extension because Havering plots are larger?+

Often, yes. The generous interwar and detached plots across Hornchurch, Emerson Park and Upminster make substantial rear and double-storey extensions viable where a tight terrace could not. The limit is usually policy rather than space. We design to use the plot fully within permitted-development allowances or a well-evidenced full application.

How long does Havering Council take to decide?+

Havering determines most householder applications within the statutory eight-week period once validated; green-belt and conservation cases can involve additional consultation. A complete, correctly scaled submission is the best way to avoid a validation query — we prepare Havering drawings to the council's checklist to keep the application on track.

How much do planning drawings cost in Havering?+

We quote a fixed fee upfront, typically around 30% below an architect's charge for the same council-accepted drawings, with free redraws until Havering approves. Because plots here allow larger schemes, the fee tracks 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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