House extensions in Liverpool & Merseyside. Single-storey, two-storey, rear, side & wraparound extensions. Quality workmanship, free quotes. Get in touch today.

House extensions in Liverpool by AJC & Son Builders

An extension is the most effective way to add both significant living space and long-term value to your home without the stress of moving. Whether you are dreaming of a light-filled open-plan kitchen, a quiet home office, or an extra bedroom for a growing family, we specialise in seamless builds that look like an original part of your property. Our team manages the entire process, from the initial groundworks and structural steel installation to the final roofing and internal finishes. We understand that a building project is a major investment, which is why we focus on meticulous planning and clear communication to ensure your new space is delivered on time, within budget, and to the highest UK building standards.

We pride ourselves on a “live-in friendly” construction approach, acknowledging that your home remains your sanctuary even during a build. Our craftsmen are experts at matching existing brickwork, roof tiles, and architectural details, ensuring the new addition complements your home’s character perfectly. From handling complex structural openings to ensuring superior thermal efficiency, we take care of the heavy lifting so you can focus on the exciting details of your new interior. By integrating modern insulation and high-performance glazing, we create extensions that are not only beautiful but are also energy-efficient and comfortable all year round.

Trusted Extensions in Liverpool & Merseyside

We’ve been building house extensions across Liverpool and Merseyside for years, and we’ve seen first-hand how disruptive a poorly managed build can be. Our approach is different — we keep your project tidy, communicate clearly throughout, and deliver work that’s built to last.

Types of extensions we build:

Single-storey extensions are a popular way to expand kitchens, dining areas or living rooms. We build everything from compact rear extensions to large open-plan kitchen-diners with bi-fold doors and skylights.

Two-storey extensions add bedrooms upstairs as well as living space below — often the most cost-effective way to gain significant additional space without moving home.

Side extensions and wraparound extensions are perfect for terraced and semi-detached homes in Liverpool and across Merseyside, opening up the ground floor for modern open-plan living.

Porches and conservatories add a smaller footprint of additional space — useful for storage, a sunroom, or a welcoming entrance to your home.

What’s included in our service:

We handle every stage of your extension build, from initial site visit and quote through to handover. Our team manages structural calculations and steelwork, brickwork that matches your existing property, roofing, windows, plastering and finishes. We work to building regulations standards on every project and can help liaise with planning authorities where needed.

We work with homeowners across Liverpool, Prescot, Huyton, Knowsley, Crosby, Formby, Southport, Halewood, St Helens and the wider Merseyside region. Whether you’re planning a single-storey kitchen extension, a two-storey side build, or a full wraparound, we’d love to hear about your project.

Every project is overseen personally by our experienced team, with regular updates and a tidy site throughout the build.

For a free, no-obligation quote on house extensions in Liverpool or anywhere across Merseyside, get in touch with our team today.

All our extension work is carried out to current Building Regulations and all local and national government standards.

Where we build extensions

We take on extension work across Liverpool, Prescot, Huyton, Knowsley, Halewood, Crosby, Formby, Southport and St Helens. If you are just outside that and the job is the right fit, ask anyway.

Common questions about extensions

Do I need planning permission for a house extension?

Many single-storey rear extensions fall under permitted development rather than needing a full planning application, but that depends on the size, the height, how close it sits to a boundary and whether the property has had extensions before. Flats, listed buildings and homes in conservation areas are treated differently. We check what applies to your property before quoting so there are no surprises.

Is building control approval the same as planning permission?

No, they are separate. Planning permission is about whether you may build it; building control is about whether it is built safely and to standard, covering foundations, structure, insulation, drainage and fire safety. An extension needs building control sign-off even when planning permission is not required.

How long does an extension take to build?

It depends on size and complexity, and on ground conditions once we open up. A single-storey rear extension is a matter of months on site rather than weeks. You get a realistic programme with your quote rather than an optimistic one, and we tell you promptly if anything changes.

What affects the cost of an extension?

The main factors are the footprint, how deep the foundations need to go, whether structural steel is required to open up the existing wall, the amount of glazing, and the level of finish inside, particularly if a kitchen or bathroom is involved. We price these separately so you can see what is driving the figure.

Do you handle the structural work as well?

Yes. We install RSJs and structural steelwork ourselves as part of the build, so opening up the back of a house or removing a load-bearing wall is handled by the same team rather than passed to a subcontractor.

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