Extension Builders

Transform your home into your perfect space by building an extension

Extend Your Home, Improve Your Space

If you love where you live but you need more space, moving home isn’t the only option. Extending your home will enable you to increase your living space, boost property value and save the hassle and expense of moving. With our extension building services, we can help you transform your home and bring your vision to life. From dream open plan kitchens to dedicated home gym spaces, we can unlock the full potential of your home.

Two storey extension

Our Approach To Building An Extension

This is what you can expect when you choose Syze Developments to complete your home extension project.

Recent Case Studies

View the successful outcomes of the projects we’ve completed for our clients.

What our clients say

“Great team to work with. Quote was not the cheapest or most expensive but work finished to highest quality. Great range of skills within the team to have a full end to end project delivery. Innovative problem-solving skills were demonstrated throughout and they very patient with constant changes by myself.”

Customer • Petersfield

“Simon took the time to visit us at home and discuss our project, giving guidance where needed. They were extremely courteous and professional, ensuring everything was tidy at the end of each day. I told Simon before the project started that my wife and I were sticklers for detail, and the end result is better than we could have hoped for. We would highly recommend without reservation”

Customer • Havant

“Beyond pleased with the work carried out. Hard working team. On time daily. Clean and respectful. Attention to detail and craftsmanship is impressive. They have fully understood our vision and created it”

Customer • Cowplain

“Great company / team to work with. Quote was not the cheapest or most expensive but work finished to highest quality. Great range of skills within the team to have a full end to end project delivery. Great problem-solving skills that were needed along the way and very patient with constant changes by myself”

Customer • Denmead

Professional Affiliations

What our experts say

“There are many good tradesmen out there, experts in their field. If you need services from several different top tradesmen, all familiar with one another and in a coordinated team, Syze Developments are focused on delivering the best result possible for our clients. When you choose us to extend your home, you can expect transparency, professionalism, and meticulous planning, ensuring a positive experience and successful outcome for your project.”

Simon Holder

Contact Us Today


Whether you will need planning permission for your home extension will depend on the height, length, materials and the siting restrictions. We can help you to understand what planning permission you might need once we get an understanding of your requirements.

When extending your home, you should expect a timeline of at least 16 to 18 weeks from start to finish. If your project is more complex, such as if you are building a second storey, this will take additional time. You can check out our article for more information on how long it takes for an extension to be built.

If you’re dreaming of building an extension onto your home, we recommend first engaging with an architect who will be able to help you explore your options and advise if planning permission will be needed. You will then need to appoint a structural engineer to design the floor and roof structures, as well as provide calculations for supporting beams. View our top tips for planning your extension here.

Petersfield extension

Why Choose Syze Developments?

Unlike other builders, we prioritise understanding your vision and bringing it to life. From the beginning, we meticulously review plans to provide a personalised quote tailored to your needs. We’ll communicate with you throughout the process, welcoming your input and suggesting improvements. Open communication is key, and our flexible team will adapt to your evolving needs. We empower you with knowledge about finishes and design, so you make informed decisions. Our highly skilled tradesmen guarantee top-notch craftsmanship. It’s this personalised service and dedication to quality that sets us apart.