Home extensions across Yorkshire

Areas we cover (within one hour drive of Carlton Barnsley)

Building company based in Barnsley

With over 40 years of experience, home extensions are at the heart of what we do – making up around 90% of our work. At Bellamy Building Company Ltd, we specialise in creating beautifully built extensions that blend seamlessly with your existing home, whether you’re adding a kitchen, bedroom, office or even a full new storey.

Our team will guide you through the entire process, from the first design ideas to the final finish. We offer clear, detailed estimates, honest advice, and we’re always happy to put you in touch with previous clients so you can hear first-hand how we work.

Tim and his team recently completed work on our extension. Throughout we found them to be very professional, hard working and extremely reliable. We would employ them again in a heart beat.

Ian B

Trusted builders in South Yorkshire, specialising in home extensions

Learn more about the home extension process

Initial chat

We start by discussing your ideas and what you’re hoping to achieve with the extension. Whether you need more living space, an extra bedroom, or a bigger kitchen, we’ll listen carefully and offer honest advice based on our decades of experience.

Site visit

We’ll visit your property to take measurements, assess the layout, and understand any potential challenges. This helps us provide accurate recommendations and ensures we’re considering everything from structural details to access and materials.

Detailed quote

You’ll receive a clear, itemised quote with no hidden costs. We’ll break everything down so you know exactly what’s included. If you’d like, we can also share contact details of previous clients who are happy to talk about their experience with us.

Plans & permissions

If architectural drawings or planning permission are required, we’ll guide you through the process. We’re used to working with local planners and can coordinate with architects or recommend trusted professionals if needed.

Setting a schedule

Once everything is in place, we’ll agree on a start date and schedule that works for you. We’ll outline how long the build is likely to take and how the work will progress, so you always know what’s happening next.

Groundwork begins

We start with foundations and structural work, making sure everything is safe, level and ready for the build. This stage might also involve adjusting existing drainage or utilities if needed.

Building the structure

Walls go up, the roof goes on, and your extension starts to take shape. We ensure all materials match or complement your existing property so the new build feels like a natural part of your home.

Interior work

Once the main structure is complete, we handle everything inside – from plastering and electrics to flooring and fittings. If your extension includes a kitchen or bathroom, we’ll coordinate with plumbers and electricians to get everything working perfectly.

Finishing touches

We’ll walk you through the completed space, make any final adjustments and ensure you’re happy with every detail. Clean, tidy and ready to enjoy – your new space will be fully finished and built to last.

Frequently asked questions

Do I need planning permission for a home extension?

It depends on the size, location and type of extension you’re building. Many single-storey extensions are allowed under permitted development rights, but larger or two-storey extensions may need planning approval. We can advise you on this as part of the process.

How much does a home extension cost?

Costs vary depending on the size of the extension, the materials used, and what’s involved inside (such as plumbing, electrics or kitchens). We provide detailed, itemised quotes so you know exactly what to expect before any work begins.

How long will the extension take to build?

Most extensions take between 8 to 16 weeks from start to finish, depending on the complexity and weather conditions. We’ll give you a clear timescale before work begins and keep you updated throughout the build.

Can I live in the house during the work?

In most cases, yes – especially for rear or side extensions. We work hard to minimise disruption, keep the site tidy and maintain access to your home where possible. If major internal changes are needed, we’ll talk through the best options with you.

Will the extension match the existing house?

Yes. We take great care to match bricks, roof tiles and finishes so your new extension blends seamlessly with the existing building. Our team has years of experience in making sure everything looks right and feels part of your home.

Do you handle building regulations and inspections?

Yes. All of our work complies with current building regulations, and we liaise with the local building control team to ensure all stages are inspected and signed off properly.

Can you help with the design or drawings?

We can recommend trusted local architects or work alongside your own if you’ve already got plans. If the project is straightforward, we may be able to work from detailed sketches and help keep the process as simple as possible.

What type of extensions do you build?

We build all types – single-storey, double-storey, wraparound and rear extensions. We also work on side extensions, kitchen extensions and garage conversions, depending on what suits your property and budget.

What areas do you cover?

We work across Barnsley, Wakefield, Rotherham, Sheffield, Doncaster and the wider South Yorkshire and West Yorkshire area. If you’re nearby and unsure, just give us a call.

Can I speak to someone who’s used you before?

Absolutely. We’re proud of our work and happy to put you in touch with previous customers. They can tell you first-hand about their experience working with us.

Check out this rear house extension

Common concerns around home extensions

I am concerned that the project will go over budget.

We completely understand – it’s a common worry. That’s why we provide a clear, detailed estimate upfront, based on our experience and your specific plans. While larger projects can sometimes involve changes along the way, we’re always open and transparent about costs and will keep you informed throughout the build. You’ll never be hit with unexpected charges without a proper conversation first.

I’m worried the build will take longer than expected.

We give realistic timescales based on decades of experience. While some delays can’t be predicted (like bad weather), we always keep you updated and work efficiently to stay on schedule.

I’m not sure if I’ll need planning permission or how to get it.

We guide you through the whole process. Many extensions don’t require planning permission, but if yours does, we’ll help you understand what’s needed and point you in the right direction for plans and submissions.

I’m concerned the extension won’t match the rest of the house.

We take great care to make sure your extension blends in with the original building. From brickwork and roofing to windows and finishes, our goal is to make it look like it’s always been there.

I’m worried about the mess and disruption during the work.

We treat your home with respect. Our team keeps the site tidy, minimises disruption wherever possible, and cleans up at the end of each day. We also protect areas of your home that aren’t being worked on.

I don’t know where to start with designs or drawings.

We can recommend trusted local architects if needed, or work alongside your chosen designer. We’re also happy to talk through your ideas and help you shape a plan that works for your space and budget.

I’m concerned about dealing with different trades – plumbers, electricians, etc.

You won’t need to juggle multiple trades – we manage the whole project for you. We only work with trusted professionals we know and use regularly, so the work stays on track and up to our standards.

I’m not sure if I can live in the house while the work is going on.

In most cases, yes – you can stay in your home. We plan the work to minimise disruption, keep essential areas accessible, and communicate clearly so you know what to expect day to day.

I’m unsure who to trust for such a big investment.

We’ve been building extensions for over 40 years and most of our work comes from word of mouth. We’re happy to put you in touch with past clients so you can hear about their experience with us.

I’m worried about the quality of the finish.

We take real pride in our workmanship. Every job is personally overseen by our team and we don’t sign off until you’re completely happy. Our goal is to leave you with a space that’s solid, stylish and built to last.

How to get started with your home extension in South Yorkshire

Get in touch

Tell us what you’re planning – we’ll arrange a quick chat or a site visit to get things moving.

Get your quote

We’ll give you a clear, itemised quote with no pressure and no hidden costs.

Get started

Once you're ready, we’ll schedule the work and bring your new space to life – on time and to a high standard.

From day 1 I knew that the building of the stone extension in my garden was in safe hands. An eye for detail meant that the whole process went as smoothly as possible. All electricians, plumbers etc. were sourced by Tim and their work was of the same high standard.

Stephen H

We had a garage and bedroom extension built by Bellamy builders. I found them to be honest, trustworthy and very professional. Their work was second to none and they turned up every day until the job was finished. I would recommended them.

Jane B