Single-storey rear extensions
The classic kitchen-diner extension, often with rooflights and wide sliding or bi-fold doors opening onto the garden.
Get a quote for single-storey rear extensions
Extension specialists across London
Home Extensions in London
More light, more space and a kitchen the family actually gathers in. We design-and-build extensions that suit London’s terraces, semis and period homes.
- Extensions are all we do
- Planning route explained
- Insurance certificates on request
- Extensions across London
Extension types
Extensions for every kind of London home
Whatever the shape of your house, there's usually a smart way to gain space.
Side-return extensions
Fill the narrow alley beside a Victorian terrace to create a wide, bright kitchen with a glazed or vaulted roof.
Get a quote for side-return extensionsWraparound extensions
Combine rear and side-return into an L-shape for the biggest possible open-plan ground floor.
Get a quote for wraparound extensionsDouble-storey extensions
Add a bedroom or bathroom upstairs and living space below in one build, usually under a householder planning application.
Get a quote for double-storey extensionsGarden rooms & annexes
Insulated garden offices, studios and annexes for working from home or multigenerational living.
Get a quote for garden rooms & annexesGlazing & rooflights
Crittall-style screens, slim sliding doors, lantern and flat rooflights specified to flood the space with daylight.
Get a quote for glazing & rooflights
Design-led
Designed around daily life
The best extensions aren't just bigger rooms. We think about where the morning light lands, how the kitchen flows to the garden, where coats and bikes go, and how the new space connects with the rest of the house.
- Layouts that work for families
- Warm, well-insulated construction
- Seamless links to the existing house
Step by step
Your extension journey
From first ideas to the day you cook in your new kitchen.
Ideas & feasibility
We visit, measure up and talk about what you want, then outline what's likely to be allowed.
Drawings & permissions
Your plans are drawn, and we guide you through permitted development, Lawful Development Certificates or planning, plus Party Wall.
Fixed quote
A detailed quote based on the drawings, with clear allowances for kitchens, glazing and finishes.
Build
Groundworks, structure, roof and glazing, then plastering, flooring and decoration.
Move in
Snagging, a walk-round and your Building Control completion certificate.
FAQ
Extension FAQs
Answers to the questions homeowners ask before extending.
Can I extend without planning permission?
Often, yes. Under permitted development, many houses can add a single-storey rear extension up to 3 m deep (terraced or semi-detached) or 4 m (detached), and larger extensions through the prior approval scheme. It doesn't apply to flats, and conservation areas and Article 4 directions can restrict it. A Lawful Development Certificate confirms your project is lawful.
Does a side-return extension need planning permission?
Side extensions have stricter permitted development limits, so many side-return and wraparound extensions need a householder planning application, particularly in conservation areas. We'll tell you which route is likely before drawings start.
How long does it take to build an extension?
After approvals, a typical single-storey rear extension usually takes a few months on site, depending on size, groundworks, glazing lead times and the finishes. Your quote includes a programme.
How much does a house extension cost?
It depends on size, foundations, the roof and glazing, the kitchen and finishes, and professional fees. Rather than quote a misleading per-square-metre rate, we price your project from the drawings.
Do I need a Party Wall agreement?
If you're building on or near the boundary, or digging foundations close to your neighbour's, the Party Wall etc. Act 1996 is likely to apply and notice must be served. Many rear and side-return extensions are affected.
Can I stay at home during the build?
Most families stay put. The kitchen is usually the room most affected, so we'll help you plan a temporary kitchen and keep dust and noise contained.
Will I need Building Regulations approval?
Yes. Extensions need Building Regulations approval covering structure, insulation, fire safety, drainage and ventilation, with a completion certificate at the end.
Do you provide the design?
We can work from your architect's drawings or introduce a designer and structural engineer so design and build are joined up.
Are you insured for extension work?
Please ask for our insurance certificates when we quote. We’ll send them to you before any work is booked, and we recommend checking the insurance of anyone who works on your home.
Why choose us
Extension builders you can trust with your home
An extension is a big commitment. Here's how we make it feel manageable.
Specialist focus
We build extensions week in, week out, so we know the common pitfalls and how to avoid them.
Approvals guidance
Practical help with permitted development rules, planning, Building Regulations and Party Wall.
Living with the build
We keep part of your home usable for as long as possible and protect what stays.
Weekly updates
Progress, decisions needed and next steps, sent to you every week.
Clear allowances
Kitchen, glazing and finish allowances are spelt out, so there are no surprises.
Insurance details on request
Ask for our insurance certificates when we quote and we’ll send them before any work is booked.
Areas served
Extensions across all London boroughs
We take on extension projects throughout Greater London.
Side-return extensions suit many Victorian terraces, while 1930s semis often suit wide rear or wraparound designs. Conservation areas and listed buildings, which are found across London, usually need a planning application and a careful choice of materials.
Each London borough is its own planning authority, so we can tell you which council you’ll be dealing with for your address and what that is likely to mean for your project.
London boroughs we cover
- Barking and Dagenham
- Barnet
- Bexley
- Brent
- Bromley
- Camden
- City of London
- Croydon
- Ealing
- Enfield
- Greenwich
- Hackney
- Hammersmith and Fulham
- Haringey
- Harrow
- Havering
- Hillingdon
- Hounslow
- Islington
- Kensington and Chelsea
- Kingston upon Thames
- Lambeth
- Lewisham
- Merton
- Newham
- Redbridge
- Richmond upon Thames
- Southwark
- Sutton
- Tower Hamlets
- Waltham Forest
- Wandsworth
- Westminster
Free quote
Start your extension quote
Share a few details and we'll arrange a free home visit.
Thinking about extending?
Book a free consultation and find out what's possible for your home.