Specialist garage conversions & building works across West Sussex. Turn your greatest unused asset into a living space you'll love.
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Transform wasted space into a stunning living room, home office, gym or annex. Our garage conversions add serious value to your home.
Side returns, rear extensions, two-storeys — we handle the full project from planning and permissions to the final fit-out.
From porcelain patios to full garden transformations with feature lighting. We create outdoor spaces you'll love year-round.
Bespoke timber-frame builds for the garden you've always wanted — designed, project-managed, and built to last.
Your garage is your greatest asset waiting to be unlocked. Adding up to 20% to your property value, a garage conversion is the highest-return build you can make in West Sussex right now. At Southwater Building Company, we specialise in turning cold, underused garages into beautiful, functional living spaces — fully project-managed from initial survey through to final handover. Whether you want a home office, a gym, a playroom, an extra bedroom, or a self-contained annex, we design and build a space that works for your family and adds lasting value to your home.
We visit your property in West Sussex, take measurements, discuss your ideas and goals, and provide a detailed, fixed-price quote — completely free and with no obligation. Most surveys are completed within 48 hours of your enquiry.
Our team handles all design decisions, building regulations drawings, and any required applications. We guide you through insulation options, flooring, heating, glazing, and electrics so you get exactly the space you've always wanted.
Our skilled tradesmen complete the conversion — typically in 4 to 6 weeks — with minimal disruption to your household. We manage every trade on site, carry out a full quality inspection, and don't sign off until you're completely happy.
No hidden costs, no nasty surprises. You get a detailed, itemised quote up front — and that's what you pay.
From planning & design right through to the final finish, we handle every single detail so you don't have to.
We don't leave until you're 100% happy. Our reputation is built on builds that look incredible and last a lifetime.
"Southwater converted our double garage into a stunning home office and games room. The whole process was seamless — on time, on budget, and the quality is incredible. We honestly can't believe the difference it's made to the house."
— Sarah M., Hampshire
Takes 60 seconds. No obligation. We'll get back to you the same day.