Home Extensions in Hampshire

Looking for a quote for your extension build? We can help build your perfect living space.

A home that works for you

Love your home but need more space? A well-designed extension adds room and value without the hassle of moving.

From kitchen extensions and open-plan living spaces to loft conversions and multi-storey builds, our expert extension builders create seamless, high-quality spaces tailored to your lifestyle and needs.

Syze Developments Extension Builders

Our Approach To Building An Extension

Home extensions can be daunting – we aim to make it as transparent and predictable as any other service.

Why choose Syze Developments to build your extension

Bringing Your Vision to Life

Your home is more than just a space, it’s a reflection of your lifestyle and aspirations. As experienced extension builders in Hampshire, we take the time to understand your vision and create a tailored plan with meticulous attention to detail.

With various design and finish options, you’ll make informed decisions at every step. Our skilled tradesmen ensure exceptional craftsmanship, and our Federation of Master Builders-approved contract guarantees transparency, so no unexpected costs once the budget is set.

What sets us apart is our open communication and seamless, stress-free experience — so you can enjoy the journey as much as the final result.

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Jason Ralphs profile picture
Jason Ralphs
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We are really happy with the quality of the work that Syze completed. They managed the onsite team of trades well and we had an open and honest dialogue throughout the build. We had several complications to the project such as asbestos removal that required specialist removal, which they managed well. We would use Syze again for future projects.
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Lisa Guile profile picture
Lisa Guile
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Syze Developments were recommended to me & rightly so. From the word go, the owner and contractors were professional, friendly and above all, helped me with decisions in how best to refurbish my 70's bungalow into a stylish contemporary home. Simon will project manage everything for you, liaising with architects, structural engineers & surveyors. His team are experienced & dedicated and take professional pride in their work. The results speak for themselves. I recommend them to anyone with small, medium or large size projects. They carried out a complete refurbishment of my 3BR bungalow with new kitchen, bathroom and beautiful bifold doors. They even took care of my needs in the garden, laying composite decking & adding a stunning resin driveway. I'm happy to show case my home in Waterlooville. Just ask Simon to contact me! That's how much I rate Syze Developments.
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Nick Blake profile picture
Nick Blake
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Simon and team have done a terrific job for us. Our architect had designed a new kitchen extension, together with several other alterations to the layout of our house. The team, led by John..a stickler for detail..were courteous, clean and tidy and worked around us as we continued to live in the house over a multi-month build. All the trades seemed nicely synchronised and have clearly worked together many times. Inevitable design changes came up and these were all expertly integrated into the plan, with budget changes discussed and agreed as we went. The team made many helpful suggestions, which we'd have never thought about. This was our first ever 'development' and we were a bit nervous, but we're delighted with the result.
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Abby Neal profile picture
Abby Neal
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Quick, clean and everything has a great finish. Thank you to Simon and his entire team for getting the project completed in the time frame discussed and for making our visions come to life. We’re really pleased with how everything has turned out.
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Pauline Stainsby profile picture
Pauline Stainsby
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Would highly recommend Simon and his team. We had our open plan kitchen extension designed and built by Syze developments to create a downstairs bedroom. The workmanship was excellent. The build was on time and in budget.
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Brandon Killien profile picture
Brandon Killien
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The end result was exactly what we wanted. The project was slightly delayed due to supplier issues, but it was worth the wait. The team was polite and ensured the area was left clean every night. There was slight creep of the scope of work, but this was due to another trade letting us down. Simon and the team carried out this additional work with no issue, and reasonably priced. Very happy customer.
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Darren Tutte
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Simon and his team completed a 2-storey side extension as well as internal re-design of the existing property. Really pleased with the build quality and workmanship. The core team were friendly, experienced and did a great job trying to minimise disruption as best they could. All the different trades worked well together and were always happy to discuss and make any changes.
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Caroline Siddall profile picture
Caroline Siddall
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I looked into several building firms before trusting Simon and his team to do the job. It was a complex double storey extension and redecoration to accomodate my father in law. I am delighted with the results - I would use them again without hesitation. All workmen used were very clean and tidy and any issues were resolved quickly and without disruption.

See Our Completed Extensions

We’re proud of the work we do and are happy to show projects we’ve completed for our clients.

Frequently Asked Questions

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.

Whether you will need planning permission for your home extension will depend on the height, length, materials and site restrictions. We can help you to understand what planning permission you might need once we get an understanding of your requirements. You might find it useful to see our article on planning your extension.

Absolutely. A major change to your home can be a daunting prospect if you’re doing it for the first time. Ask us for a consultation and we’ll happily look over whatever plans or sketches you have. We can suggest cost-effective solutions or point out problems early.
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.
All homes are different and every extension is unique. But materials and labour costs are surprisingly stable – and we can predict a rough budget even with basic details. See our article ‘How does an extension cost?‘ to get an immediate idea.
The number one concern from customers is that the cost will increase once underway. That doesn’t happen with us. Our contract is approved by the Federation of Master Builders and we project manage carefully to keep the everything on time and to budget.
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.

Whether you will need planning permission for your home extension will depend on the height, length, materials and site restrictions. We can help you to understand what planning permission you might need once we get an understanding of your requirements. You might find it useful to see our article on planning your extension.

Absolutely. A major change to your home can be a daunting prospect if you’re doing it for the first time. Ask us for a consultation and we’ll happily look over whatever plans or sketches you have. We can suggest cost-effective solutions or point out problems early.

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.

All homes are different and every extension is unique. But materials and labour costs are surprisingly stable – and we can predict a rough budget even with basic details. See our article ‘How does an extension cost?‘ to get an immediate idea.
The number one concern from customers is that the cost will increase once underway. That doesn’t happen with us. Our contract is approved by the Federation of Master Builders and we project manage carefully to keep the everything on time and to budget.

Professional Affiliations

Our contracts are approved by the Federation Of Master Builders for total peace of mind.

What happens next?

Ready to take the next step? We offer a free, no-obligation home consultation to discuss your ideas. Whether you have detailed plans or just a rough sketch, we’ll provide expert guidance to help you move forward with confidence.

Fill out the form to get started—we’d love to hear about your project!