Loft Maker London
Side Extensions in London and Essex
The side return is usually the most under-used space on a London plot. Filling it with a well-designed extension is the cheapest way to add a proper room.
On most Victorian, Edwardian and post-war houses in London and Essex, the plot is wider than the house. That gap along the side, the side return, is often paved, gravel or simply left as a strip of grass, and it is often the cheapest square footage on the whole plot.
A side extension turns that strip into a room: a kitchen-diner, a utility, a home office, a bedroom, or a garage with a room over it. Because it is usually a single storey, it needs less structural work than a rear extension, sits less awkwardly against the neighbours, and can often be done under permitted development. Where the street is conservation-minded or the gap is tight, the design matters more than the volume, and that is where a good designer earns their fee.
Permitted development: what is actually allowed
A single-storey side extension can often be permitted development. The Class A limits for a side extension under Schedule 2, Part 1 of the GPDO 2015 are that it must be no more than half the width of the original house, measured at its widest point, must be no more than four metres high, and must not extend beyond a side wall more than that. If the side extension also extends beyond a rear wall, then the limits that apply to rear extensions start to apply as well.
Where it does not comply, or where the property is in a conservation area or affected by an Article 4 direction, you need a householder planning application. Note that conservation areas remove permitted development rights for this kind of work in most cases, so in parts of Chingford, South Woodford and other conservation areas around London this is a planning application rather than a permitted development certificate.
Neighbours, daylight and the neighbour consultation scheme
Side extensions are less controversial than rear extensions because they are single storey and usually narrower, but daylight and overshadowing to a neighbouring window or garden is still the most common reason an objection is raised. We design to reduce that: keeping the ridge and eaves heights low, keeping the footprint within the width that reads as modest from the street, and using rooflights rather than a full-width window on the flank elevation where the boundary is close.
Rear extensions that exceed the standard depth limits can fall into the larger single-storey extension provisions, which are subject to a neighbour consultation scheme rather than a full planning application. We will tell you which route your project actually needs rather than assuming the simpler one applies.
Roof, materials and the GRP question
A side extension needs a roof that sheds water and lasts. The options are a pitched roof that matches the house, a flat roof with a parapet, or a GRP flat roof system. GRP is a good choice for small and medium single-storey extensions because it is a seamless, joint-free surface with no tiles to slip and a long service life, and it can be laid directly on a simple deck.
Whatever the roof, the external materials need to sit comfortably next to the existing house. That is a requirement under permitted development and it is also what a planning officer will look at. Matching brickwork, render colour and window style usually reads better than an attempt at something more ambitious.
What is included, and how long it takes
Measured survey, design and drawings, planning or permitted development submission, structural engineering, building regulations, groundworks, foundations, the build, roofing, glazing, plastering, electrics, plumbing, heating, decoration, and the completion certificate. We can programme a side extension together with a loft conversion above it, which shares foundations and scaffold and usually costs less than doing them one after the other. On-site time is typically ten to sixteen weeks depending on size, ground conditions and access, and every project carries a 10-year structural warranty.
Related services
- GRP Flat Roofing London & Essex — A single welded, joint-free membrane with no tiles to slip. A durable flat roof for extensions, garages, porches and full roof replacements.
- Structural Steel Installation London — Beams, posts and frames that let you take out a load-bearing wall or open up a plan, calculated by an engineer, fabricated and installed by us.
- Loft Conversions London & Essex — Turn unused roof space into a bedroom, bathroom or home office. We handle design, consents, structure and the build.
Frequently asked questions
How far can a side extension project from the side wall?
Under the standard permitted development limits, no more than half the width of the original house, measured at its widest point. It must also be single storey and no more than four metres high. If it goes further, or you want two storeys, you need planning permission.
Do I need planning permission for a side extension?
Not always. A compliant single-storey side extension on a house outside a conservation area is often permitted development. In a conservation area, or under an Article 4 direction, the rights are removed and a householder application is needed. We check the specific address before we tell you which applies.
Can I build a side extension on a semi-detached house?
Yes, subject to the boundary and the design. The width limit is half the width of your house, and any window close to the boundary may need to be obscure glazed. Overlooking the neighbour is a frequent reason for objection, so we keep the flank elevation simple and use high-level or rooflight glazing where the gap is tight.
Do I need foundations for a side extension?
Usually yes. A single-storey extension still carries a floor load, and the strip alongside a house is often where old foundations, drains or a boundary wall already sit. We carry out the trial holes and the structural design as part of the job rather than leaving it to a guess.
Should I build the side extension and the loft conversion at the same time?
If you are doing both, it usually makes sense. They share scaffolding, access and sometimes foundations, and doing them together means one mobilisation and one set of building regulations approvals instead of two programmes.
Do I need planning permission for a side extension?
Usually yes. Most side and rear extensions require planning permission because they alter the footprint and massing of the dwelling, and permitted development rights are limited by boundary distances, height and the size of the addition. We handle the application.
What about building regulations?
Building Regulations approval is separate from planning permission and applies to the structure, insulation, ventilation, fire safety and means of escape. It can run alongside the planning application, and we build to the approved drawings and inspections are arranged as part of the contract.
What does Loft Maker London do?
We are a London and Essex construction company specialising in loft conversions, dormer and mansard roof construction, side extensions, GRP flat roofing and structural steelwork. We handle design, planning, structural engineering, groundworks, roofing and finishing in-house, so you deal with one team from first drawings to handover.
Which areas do you cover?
We work across London and Essex, including Chingford and South Woodford. We are a mobile, service-area business, so we come to you rather than asking you to visit an office.
How much does a loft conversion cost?
It depends on the property, the specification and how much of the work is structural. A straightforward conversion in an existing roof space costs less than one that needs a new structural opening, steelwork or extensive roof construction. We price every project individually and give you a clear written quote before work starts, so there is no ambiguity about what you are paying for.
Do I need planning permission for a loft conversion?
Not always, but it depends on the property and the work. Many loft conversions fall within permitted development, while mansard roofs, dormer windows in conservation areas, and work that changes the volume of a dwelling often need planning permission. Building Regulations approval is a separate requirement and applies to most structural work. We assess your specific property, tell you exactly which permissions are needed, and handle the applications.
How long does a loft conversion take?
A conversion that does not require planning permission is often built in two to three weeks on site, but the full project - surveys, designs, approvals, build and finishing - takes considerably longer. Projects involving a mansard roof, an extension or steelwork take longer again. We give you a realistic programme with the quote, and we keep you informed if anything changes.
Is my project covered by a warranty?
Every project we complete is backed by a 10-year structural warranty. The full policy wording and schedule of cover are issued to you at handover, so you know exactly what is covered and what to do if you need to make a claim.
Do you handle Party Wall notices?
Yes. Where your project affects a neighbouring property, Party Wall notices or an award may be required before work starts. We prepare the necessary paperwork, serve the notices and coordinate with the adjoining owner's surveyor where one is appointed.
Can you work from drawings we already have?
Yes. If you have planning approval, architectural drawings or structural calculations, we can price and build from them. If you would rather we took the design and planning on as well, we can do that instead - just tell us which stage you have reached.
Can you match an existing roof or extension?
Yes. We work with a range of roof tiles and finishes, and we match existing materials where we are extending or building alongside original fabric, so the finished work reads as part of the house rather than an addition to it.
What happens after I get in touch?
We arrange a free, no-obligation consultation at your property. We look at the space, discuss what you want to achieve and any constraints, and then come back to you with options and a clear written quote. There is no obligation to proceed.
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