Single-storey rear extension onto a garden behind an interwar semi-detached house in Collier Row RM5 in the London Borough of Havering

Collier Row · RM5 · Havering

House Extension Drawings in Collier Row RM5

Fixed-fee, MCIAT-chartered house extension drawings for Collier Row (RM5) homeowners — London Borough of Havering validation and local constraints handled from the start.

Collier Row (RM5) took shape as an interwar suburb of Romford, expanding through the 1920s and 1930s across former Essex farmland. It is a planned residential district rather than a historic village core, with predominantly semi-detached housing, so almost every householder project here is an extension or loft on one of those consistent interwar pairs.

There is no conservation area covering Collier Row — that is a genuine, verified fact, not an omission. Its planning character is instead shaped by the uniformity of its interwar suburban roads and by the London Borough of Havering's householder design expectations, which favour keeping the semi-detached rhythm, the gaps between pairs and the original materials intact. We treat that suburban cohesion, rather than a conservation designation, as the reference point when we design an extension.

Demand for rear extensions, two-storey side extensions and hip-to-gable lofts is steady across roads like Mawney Road, Silvermere Avenue and Victoria Avenue, where regular plots and gardens are typical. We check each property's permitted-development position against Havering'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

Collier Row RM5

Collier Row (RM5) — planning at a glance

Council: London Borough of Havering
Postcode district: RM5
Planning portal: View the Havering planning portal
Housing stock: Predominantly interwar semi-detached houses on planned suburban roads, with postwar and modern infill on regular gardened plots. The consistent pairs and generous front and rear gardens are what makes rear extensions, side extensions and hip-to-gable loft conversions the common projects here.
Article 4: No area-specific Article 4 direction is published for Collier Row; the London Borough of Havering's borough-wide permitted-development controls and householder design guidance still apply.
Sample streets: Collier Row Road · Lodge Lane · White Hart Lane · Clockhouse Lane · Mawney Road · Lawns Way · Mashiters Hill · Carter Drive · Ravenswood Close · Hunter's Grove · Silvermere Avenue · Victoria Avenue
Local constraints: Consistent interwar semi-detached street pattern, so front-elevation changes, roof forms and the gap between pairs are assessed against a cohesive suburban rhythm rather than a one-off houseHavering's borough-wide permitted-development limits and householder design guidance govern extension depth, height and coverage — no local Article 4 direction narrows them further in Collier RowMatching original facing brick, render, tile-hanging and roof tiles so a rear or side addition reads as part of the original interwar pair rather than an obvious bolt-onThe characteristic gap between semi-detached pairs, which the council protects so streets do not close up — this shapes how wide a two-storey side extension can be and whether it must be set back and set downRegular but finite plot and garden sizes, which constrain how deep a single-storey rear extension can go before it needs a full householder applicationShared party walls and building lines between paired houses, making party-wall relationships, overshadowing and neighbour amenity relevant to what gets approved

Planning in Collier Row (RM5): what to know before you apply

Because Collier Row's suburban roads repeat so consistently, Havering assess extensions against the established semi-detached pattern, so matching original brick, render and roof form and preserving the gap between pairs 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 the finite gardens and shared building lines mean depth, height and neighbour impact are the points a householder application is judged on.

Typical Collier Row housing stock

Predominantly interwar semi-detached houses on planned suburban roads, with postwar and modern infill on regular gardened plots. The consistent pairs and generous front and rear gardens are what makes rear extensions, side extensions and hip-to-gable loft conversions the common projects here.

Streets we regularly draw for in Collier Row

Collier Row Road · Lodge Lane · White Hart Lane · Clockhouse Lane · Mawney Road · Lawns Way · Mashiters Hill · Carter Drive · Ravenswood Close · Hunter's Grove · Silvermere Avenue · Victoria Avenue

House Extension Drawings for Collier Row (RM5) homes: the package and the process

Every house extension drawings we prepare for an Collier Row property is drawn to London Borough of Havering’s validation standards and tuned to the RM5 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
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

Also in Collier Row RM5

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

FAQ

House Extension Drawings in Collier Row RM5 — 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 to extend a house in Collier Row?+

Not always. Many Collier Row semis retain permitted development rights, so a modest single-storey rear extension or a hip-to-gable loft conversion can often proceed without a full planning application. Because the plots are regular but finite and the gap between pairs is protected, we check your property's size limits and building lines against Havering's controls first, and prepare a full householder application where the project goes beyond permitted development — as a two-storey side extension often will.

Is Collier Row in a conservation area?+

No. There is no conservation area covering Collier Row. Its planning character is shaped instead by its uniform interwar semi-detached suburban roads and Havering's householder design expectations, which favour keeping the semi-detached rhythm, the gaps between pairs and the original materials intact when you extend.

How much do planning and building-regulation drawings cost for a Collier Row extension?+

We work to fixed fees agreed before we start, with a typical turnaround of around seven days for a standard rear extension, side extension or loft on a Collier Row semi. 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.

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