Rear single storey extensions
Ideal for opening the back of the house into a larger kitchen, dining and living space with rooflights, sliding doors or bi-fold doors.
Best for garden connectionWest London extension specialists
Single Storey Extensions in West London
Design and build single storey rear, side return and wrap-around extensions across West London. We help homeowners in Ealing, Chiswick, Fulham, Hammersmith, Hounslow, Isleworth, Acton and nearby areas create brighter kitchens, family rooms and open-plan living spaces with clear planning support and fixed quotes.
West LondonEaling, Chiswick, Hammersmith & nearby
Design & Buildone managed process
Fixed Quoteclear scope before work starts
Free Surveypractical advice for your home
Design and build service
Design & Build Single Storey Extension Specialists
A well-designed single storey extension can completely change the way a West London home works, especially where the existing kitchen, dining area and garden connection feel restricted.
We design and build practical extensions for Victorian terraces, Edwardian houses, semi-detached homes and family properties across Ealing, Acton, Chiswick, Fulham, Hammersmith, Shepherd’s Bush, Hounslow, Isleworth, Hanwell, Hillingdon and Uxbridge.
From the first survey, we look at layout, light, drainage, foundations, structural steel, planning route, building control, party wall matters and finish level, so you understand what is possible before committing to a build.
- Free site survey and feasibility advice
- Design, planning and structural coordination
- Fixed-price quote with clear inclusions
- Full project management through to handover
Extension types
What Type of Single Storey Extension Is Right for Your Home?
We help you choose the extension type that fits your property, planning route, budget and lifestyle.
Side return extensions
A strong option for Fulham, Hammersmith, Chiswick and Ealing terraces where the unused side alley can become valuable kitchen space.
Best for terracesWrap-around extensions
Combines rear and side return space to create a larger family kitchen, utility zone, dining area or open-plan ground floor.
Best for maximum spaceOpen-plan kitchen diners
Perfect for modern family living, with careful planning around natural light, storage, appliances, structure and garden access.
Most popular finish
Why extend?
Why Homeowners in West London Extend Instead of Move
Moving in West London can be expensive and disruptive. A single storey extension lets you stay in the area you already know while creating the space your home is missing.
Create a brighter kitchen and dining space
Roof lanterns, flat rooflights, large glazing, sliding doors and thoughtful internal planning can turn a narrow or dark ground floor into a spacious kitchen-diner.
Improve garden connection
Opening the rear wall with slimline doors can make the kitchen, dining area and garden feel like one connected family space.
Increase practical living space
Depending on your home, your extension can include a utility, WC, pantry, storage wall, play area, seating zone or work-from-home corner.
Costs
Single Storey Extension Costs in West London
Every project is different, so a survey is essential. The guide below helps you understand the main cost drivers before requesting a fixed quote.
| Extension type | Typical West London range |
|---|---|
| Small rear extension | From around £45,000–£75,000+ |
| Side return extension | From around £55,000–£90,000+ |
| Wrap-around extension | From around £80,000–£140,000+ |
| High-spec kitchen diner | Often £100,000+ depending on finishes |
What affects the final cost?
Size, foundations, drainage, steel design, glazing, roof lanterns, kitchen specification, heating, electrics, flooring, plastering, decoration and finish level all affect cost.
What is included in a fixed-price quote?
Your quote can include demolition, groundworks, structure, roof, insulation, glazing, first fix, second fix, plastering, external finishes, project management and agreed internal works.
Planning Permission and Building Regulations in West London
Many single storey extensions can be possible under permitted development, but the rules depend on property type, depth, height, boundary position, previous extensions and whether the home is in a conservation area or affected by Article 4 directions.
Useful official guidance: Planning Portal extension rules, single-storey extension mini guide, GOV.UK party wall guidance, Hounslow residential extension guidance and Hammersmith & Fulham planning advice.
- Permitted development: may apply where depth, height, materials and boundary rules are met.
- Prior approval: larger single storey rear extensions may need neighbour consultation through the council.
- Conservation areas: Ealing, Hammersmith, Fulham, Chiswick and other West London areas can need more careful design.
- Building Regulations: structure, insulation, ventilation, drainage, fire safety and electrics must be compliant.
- Party wall matters: terraced and semi-detached homes often need neighbour notices before structural work starts.
Process
Our West London Design and Build Process
Free site survey
We review your property, access, structure, drainage, planning route and what you want the new space to achieve.
Design, drawings and permissions
We coordinate the design route, planning checks, structural calculations and Building Regulations requirements.
Build programme
Your extension is managed through groundworks, structure, roofing, glazing, first fix, second fix and finishing.
Handover and aftercare
We complete final checks, snagging and handover so the new space is ready to use.
Project examples
Recent Single Storey Extension Projects in West London
Use these project examples to see how different single storey extension types work for West London homes.
Ealing rear extension
Rear extension with roof lantern and large glazed opening for a brighter family kitchen-diner.
Fulham side return
Side return layout for a terraced home needing better kitchen width, daylight and garden access.
Hammersmith build
Extension shell and structural work in progress before glazing, services and internal finishes.
Hounslow wrap-around
Rear and side extension creating a larger kitchen, dining, utility and seating zone.
Isleworth kitchen-diner
Open-plan kitchen and dining extension designed around everyday family use.
Before and after
A clear transformation from a restricted rear room into a bright modern extension.
Chiswick kitchen extension
Finished open-plan space with rooflights, island, dining area and garden connection.
Local proof matters
Real West London project detail, named areas and high-quality photography help homeowners compare extension builders with confidence.
Ask for a site surveyWhy choose us
Why Choose House Extensions London?
We combine practical design advice, planning awareness, structural coordination and managed construction.
Local West London experience
We understand common property types in Ealing, Acton, Chiswick, Fulham, Hammersmith and Hounslow.
Planning and compliance support
We help you understand permitted development, prior approval, Building Regulations and party wall matters.
Fixed quotation approach
Clear scope, realistic budget drivers and transparent inclusions before the build starts.
Project management
One managed process from survey and design support through to construction and handover.
Quality finishes
Roof lanterns, slimline doors, brick matching, kitchens, lighting, flooring and finishing planned properly.
Fast next steps
Send your postcode, photos or drawings and we will advise on feasibility and likely route.
FAQs
Frequently Asked Questions
Do I need planning permission for a single storey extension in West London?
Some projects fall under permitted development, but planning permission may be needed for larger extensions, flats, maisonettes, conservation areas, listed buildings or homes with previous extensions.
How far can I extend under permitted development?
Limits depend on the property type, extension depth, height, boundary position and previous changes. Larger rear extensions may need prior approval.
How much does a single storey extension cost in West London?
Small rear extensions often start from around £45,000–£75,000+, while side return, wrap-around and high-spec kitchen-diner projects can cost more depending on specification.
How long does a single storey extension take?
Many builds take several months, depending on design, approvals, structural work, glazing lead times, kitchen fit-out and finish level.
Do I need a party wall agreement?
Many terraced and semi-detached homes need party wall notices where works affect shared walls, foundations or boundary structures.
Can I stay in my home during the build?
Often yes, but it depends on the scale of works, kitchen disruption, services, dust control and access arrangements.
What is the difference between rear, side return and wrap-around extensions?
A rear extension extends out from the back, a side return fills the side alley, and a wrap-around combines both to create a larger footprint.
Can you work from plans I already have?
Yes. We can review existing drawings, advise on buildability, highlight missing details and price the construction scope.
Will a single storey extension add value?
A well-designed extension can improve usability and appeal, but the value uplift depends on location, finish, layout and market conditions.
Which areas of West London do you cover?
We cover Ealing, Acton, Chiswick, Fulham, Hammersmith, Shepherd’s Bush, Hounslow, Isleworth, Hanwell, Hillingdon, Uxbridge and nearby areas.
Get your free quote
Book Your Free West London Site Survey
Tell us about your home, postcode and extension goals. We will advise on likely planning route, buildability, budget drivers and next steps.
- Free no-obligation first conversation
- Advice on rear, side return and wrap-around options
- Planning, Building Regulations and party wall guidance
Free Survey
Fixed Quote
Fast Reply
Request a fixed quote
Complete the form and our team will contact you to discuss your West London single storey extension.
No pressure. No obligation. Typical reply within 1 working day.
Ready to plan your West London extension?
Speak with a local extension specialist about your layout, planning route, costs, build programme and best design options.