Single Storey Extensions
One of the most popular ways to expand a home — perfect for creating larger kitchens, open-plan living spaces, dining areas or a home office, with increased ground floor space and improved natural light.
Adlington House Extension Specialists
House Extensions Adlington
Planning a house or kitchen extension in Adlington? KJL Builders are local extension builders covering Adlington and the surrounding areas — single storey, double storey, rear, side and wrap-around extensions, designed and built around how you live. One team handles everything from drawings and planning through to building control sign-off and the final finish.
Need other building work in Adlington? See our Builders Adlington page for knock throughs, garage conversions, loft conversions, kitchens and more across the area.
Why Choose KJL Builders
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Experienced House Extension Builders
Homes in Adlington range from period terraces and semis to inter-war housing, post-war estates and newer developments, and each brings its own considerations when extending. KJL Builders design and build house extensions that suit each of them — matching brick, roof lines and proportions so the extension looks like it has always been part of the house — and we liaise with Chorley Council building control throughout, so your finished extension is fully signed off.
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Experienced Specialists
Years of experience designing and building high-quality house extensions.
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Fully Managed Projects
A complete service from initial planning through to final completion.
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Quality Workmanship
High standards of craftsmanship on every extension we build.
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Transparent Pricing
Clear, fair quotes with no hidden costs.
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Local Expertise
Local builders covering every Adlington postcode and the surrounding areas.
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Tailored Designs
Extensions designed to suit your home and lifestyle.
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Building Control & Regulations
We liaise directly with building inspectors, structural engineers and architects throughout your project, and can source and appoint these professionals on your behalf if you don't already have your own.
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Pay As You Build
We don't take any payment until the foundations have been dug out and the building inspector has been out to inspect and pass them — so you're never paying up front on trust alone.
Areas we cover
House Extensions Across Adlington Postcodes
We build house extensions across every Adlington postcode district — from the centre out to the surrounding areas. Here's a breakdown of the areas within each postcode.
| Postcode | Areas Covered |
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| PR6 | Abbey Village, Adlington, Anderton, Anglezarke, Astley Village, Brindle, Brinscall, Clayton-le-Woods, Heapey, Heath Charnock, Wheelton, Whittle-le-Woods, Withnell |
Don't see your exact street listed? We build extensions across the whole of Adlington and the surrounding areas — get in touch and we'll confirm we cover your postcode.
What we build
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Types of House Extensions We Build
Whichever type of extension suits your home, our experienced team manages the project from first design to final finish.
Double Storey Extensions
Significantly increases both ground and upper floor space — ideal for additional bedrooms, extra bathrooms or a complete layout transformation, offering excellent value by sharing structural costs.
Rear Kitchen Extensions
Expands the back of the property to create larger living areas or open-plan kitchens that connect to the garden, often finished with bi-fold doors and roof lights to maximise natural light.
Side Return Extensions
Uses the narrow unused space beside a property to extend the kitchen or living area — particularly popular with terraced and semi-detached homes looking to improve layout and functionality.
Wrap Around Extensions
Combines a rear and side extension to create one large open living space, completely transforming the ground floor — ideal for large open-plan kitchens and modern family living areas.
Budgeting for your project
How Much Does a House Extension Cost in Adlington?
While every project is different, a typical extension in the UK generally ranges between £2,500 and £3,000 per square metre. The final price depends on the size of the extension, the type of extension (single storey usually costs less than double storey or wrap-around), the materials and finishes chosen, the complexity of the design, and site-specific factors such as access and ground conditions. Here are some rough examples based on that typical range.
£50,000 – £60,000
Small Single Storey (20m²)
Ideal for kitchen or dining room expansions.
£100,000 – £120,000
Medium Double Storey (40m²)
Perfect for adding bedrooms and expanding living areas.
£150,000 – £180,000
Large Wrap Around (60m²)
Great for full ground floor transformations and open-plan living.
For an accurate estimate, we recommend requesting a personalised quote based on your property and design requirements. Get in touch →
No payment until your foundations pass inspection. We don't ask for any money until the foundations have been dug out and the building inspector has been out to inspect and sign them off — giving you full confidence before any payment is made.
Get an estimate
Extension Cost Calculator
Enter your extension's dimensions and any extras below, then submit your details and we'll send you a personalised estimate — get in touch for an accurate price based on a site visit.
Downstairs
Upstairs
Reduces the overall build rate for a simpler, structural-only build (walls, roof and windows — no plastering, flooring or fit-out).
Adds additional cost depending on whether it's a single or double storey extension.
Get Your Instant Price Estimate
Fill in your project details on the left, add your contact details below, then unlock your instant price estimate.
Thanks — we'll be in touch shortly to arrange your free site visit and confirm the exact price.
Recent projects
Recent House Extensions We've Completed
How it works
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Our House Extension Process
At KJL Builders, we follow a clear and structured process to ensure your project runs smoothly from start to finish.
Initial Consultation
We begin by discussing your ideas, goals and budget, to understand exactly what you want from your extension.
Design and Planning
Our team works with architects, structural engineers and designers to create a layout that complements your home, and can assist with planning permission and building regulations if required. If you don't already have an architect, structural engineer or building inspector lined up, we can source these for you.
Detailed Quotation
You'll receive a clear and transparent breakdown of costs, including materials, labour and timelines. We don't take any payment until the foundations have been dug out and the building inspector has been out to inspect and pass them off.
Material Selection
We help you choose the best materials and finishes to match your vision and ensure durability.
Construction
Our experienced builders handle every stage of the build, maintaining high standards of workmanship throughout.
Quality Checks
Regular inspections ensure your extension meets our strict quality standards.
Project Completion
Once construction is complete, we walk through the finished project with you to ensure everything meets your expectations.
Aftercare Support
Even after the build is finished, we remain available for any support or advice you may need.
Customer feedback
What Our Clients Say
Feedback from homeowners who chose KJL Builders for their house extension.
★★★★★
KJL Builders recently completed our rear kitchen extension and we are extremely pleased with the result. The team were professional, reliable and kept us updated throughout the build. The new open-plan kitchen and dining area has completely transformed how we use our home.
★★★★★
We hired KJL Builders for a double storey extension at our home. The whole project was managed very smoothly and the quality of workmanship was excellent. The additional bedrooms and larger living space have made a huge difference for our family.
★★★★★
Fantastic experience working with KJL Builders on our single storey extension. The team were friendly, hardworking and the finish was exactly what we hoped for. Our new kitchen and dining area looks amazing and has added real value to the house.
Questions answered
House Extension FAQs
Useful information before you start planning a house extension with KJL Builders.
Ask us a questionAll of them — including Anderton and Heath Charnock — plus the surrounding areas such as Chorley, Coppull, Euxton, Bolton.
House extensions typically cost between £2,500 and £3,000 per m², depending on size, design and materials. Contact us for a personalised quote.
Some extensions fall under permitted development, meaning planning permission may not be required. We can advise you and help with the planning process if needed.
A typical single storey extension takes around 8–12 weeks, while larger extensions may take 3–5 months depending on the project.
Yes, a well-designed extension can increase both living space and property value.
Popular options include single storey, double storey, rear and wrap-around extensions. The best choice depends on your property and needs.
Yes, we provide a fully managed service including design, planning support, construction and completion.
Yes. We work closely with building inspectors, structural engineers and architects throughout every project, and if you don't already have your own, we can source and appoint these professionals on your behalf.
We don't take any payment until the foundations have been dug out and the building inspector has been out to inspect and pass them off. You'll receive a clear, staged payment schedule for the rest of the build once that first stage is complete.
Other services
Related Services
KJL Builders cover the full range of building work across Adlington and the surrounding areas — explore our other Adlington services below.
Nearby areas
Also Covering the Areas Around Adlington
As well as Adlington itself, we cover the surrounding towns and areas, including:
Ready to start your house extension?
Tell KJL Builders what you have planned and arrange a free house extension quote anywhere in Adlington or the surrounding areas.
Get in touch
Request Your Free House Extensions Quote
Fill in the form below with a few details about your project and we'll get back to you with a free, no-obligation quote.
We'll never share your details with anyone else. By submitting this form you agree to be contacted by KJL Builders about your enquiry.