Rear Extensions
Extend into the garden to create a larger kitchen, dining or family room with stronger indoor-outdoor living.
Popular for open-plan kitchensLondon design & build specialists
Single Storey Extensions London
Create a brighter, larger ground floor with a bespoke single-storey extension designed around your home, your planning requirements and the way your family lives.
Londonlocal extension specialists
1 Teamdesign, planning and build
Freeinitial consultation
Clearfixed pricing approach
More space without moving
Designed for London homes that need more light, space and value
A single-storey home extension is one of the most effective ways to transform a London property without building upwards.
Whether you want an open-plan kitchen extension, a larger dining area, a family living space, a utility room or a better connection to the garden, we design and build extensions that feel natural to the original home.
Our service is built for London homeowners who want clear advice, realistic costs and a smooth build from concept through to completion.
- Bespoke layouts for Victorian terraces, semi-detached houses and detached homes
- Smart use of glazing, rooflights and bi-fold or sliding doors
- Guidance on permitted development, planning applications and building regulations
- Practical construction planning to reduce disruption during the build
Types of single-storey extensions we build
Every London property is different, so we recommend the extension style that gives you the best space, value and planning route.
Side Return Extensions
Use the unused side alley of a London terrace to widen a narrow kitchen and bring in natural light.
Ideal for period terracesSide Extensions
Add practical space to semi-detached or detached homes for a utility, office, playroom or larger living area.
Great for wider plotsWrap-Around Extensions
Combine rear and side extension space for the biggest transformation across the ground floor.
Maximum ground-floor spaceSimple managed process
Our single-storey extension process
We keep the project clear from the first conversation, so you understand the design, permissions, cost and build route before committing.
Consultation & survey
We discuss your goals, review your property and advise on the most suitable extension options.
Design, planning & regulations
We help with drawings, permitted development checks, planning permission, building regulations and structural requirements.
Construction & project management
Our team manages the build, communication, schedule and quality control from start to finish.
Completion & handover
We complete the finishes, snagging and final checks so the new space is ready to enjoy.
Planning permission and building regulations made clear
Many single-storey rear extensions may fall under permitted development, but London properties often need careful checks because conservation areas, listed buildings, party wall matters and local council rules can affect the route.
- Terraced and semi-detached rear extensions may often extend up to 4m under permitted development.
- Detached homes may often allow a larger rear extension, subject to limits and neighbour consultation rules.
- Building regulations approval is still needed for structure, insulation, drainage, electrics and safety.
- We guide you through the correct route before work starts.
Why choose us for your London single-storey extension?
You need more than a builder. You need a team that understands London homes, planning challenges, budgets and high-quality finishes.
London-focused expertise
We design around common London property types, including terraces, semi-detached homes and compact plots.
Design & build support
Keep your project simpler with one coordinated route from idea and drawings through to construction.
Transparent pricing
Clear quotations and practical advice help you understand costs before committing to the build.
Planning guidance
We help check whether your extension needs planning permission or can use permitted development.
Project management
Communication, scheduling and site coordination are managed so the build runs as smoothly as possible.
Built around your lifestyle
Every extension is designed for how you cook, relax, entertain, work and use your garden.
Single-storey extension costs in London
Costs depend on size, specification, structure, glazing, kitchen requirements, drainage and finishes. As a guide, London single-storey extensions are often priced per square metre, with higher specifications and complex sites costing more.
Basic specification
Suitable for simpler layouts and standard finishes where the structure is straightforward.
From approx. £2,300/m²Mid-range finish
Popular for quality kitchen-living extensions with rooflights, glazing and better finishes.
Approx. £2,800–£3,200/m²High specification
For premium glazing, complex steelwork, bespoke kitchens and higher-end materials.
Approx. £3,300+/m²Fixed quote
After reviewing your project, we provide a clearer quotation based on your exact property and scope.
Free consultationFrequently asked questions
Helpful answers before you start planning your London home extension.
How much does a single-storey extension cost in London?
Costs vary by size, specification and complexity. A basic London extension may start around £2,300 per m², with mid-range and higher-spec projects costing more. We provide a tailored quote after reviewing your property and requirements.
Do I need planning permission for a single-storey extension?
Many rear extensions may qualify under permitted development, but planning may be needed for conservation areas, listed properties, larger designs or side/wrap-around extensions. We check this before you proceed.
How long does a single-storey extension take?
Construction often takes around 8–12 weeks depending on complexity, access, weather, structural work and finishes. Design and planning stages can add additional time before building starts.
Can you manage design, planning and build?
Yes. We can support the full route, including design advice, planning guidance, building regulations, construction and project management.
What areas of London do you cover?
We cover Greater London, including West London, North London, South London, East London and Central London boroughs.
Start your single-storey extension with confidence
Tell us what you want to create and we will advise on the best next step, from feasibility and planning through to construction.
- Free consultation with no obligation
- Advice on planning and permitted development
- Guidance on structural calculations and building regulations
- Design, project management and build support
London Focus
1 Expert Team
Free Initial Review
Request Your Free Quote
Tell us about your project and we will come back to you with the best next step.
No pressure. No obligation. We reply within 1 working day.
Ready to add more space to your London home?
Speak with our team about your single-storey extension and get clear guidance on design, planning, cost and build options.