Home Renovations, Extensions & Building Services Across Sydney
- Fully Licensed
- Fully Insured
- Fixed Price Quotes
Home Renovations, Extensions & Building Services Across Sydney
From extensions, kitchens and bathrooms to complete home transformations, COS Constructions delivers quality renovations built to last.
We’re a tight-knit team of licensed builders, project managers and craftspeople who specialise in residential renovations across Sydney.
Every project from a single bathroom to a complete home transformation gets the same obsessive attention to detail, transparent communication and respect for your home.
We’re proud of our reputation, our reviews and the long list of Sydney families who refer us to their friends.
We take pride in delivering quality renovations backed by exceptional workmanship, clear communication, and reliable service which is why our clients trust us to bring their vision to life.
We take pride in delivering quality renovations backed by exceptional workmanship, clear communication, and reliable service which is why our clients trust us to bring their vision to life.
"They transformed our home exactly how we envisioned it. The team was professional, communicated clearly throughout the project, and delivered exceptional workmanship. We couldn't be happier with the finished result."
"From the initial consultation through to completion, the entire process was seamless. The team remained professional, delivered quality workmanship, and kept everything running smoothly from start to finish."
"Our renovation exceeded every expectation we had. Excellent communication, reliable service, and outstanding attention to detail. The finished space looks incredible and feels built to last."
"We chose COS Constructions for our renovation after speaking with several builders, and it was the best decision we made. The team delivered quality workmanship and a finished result that exceeded our expectations."
A Cost Plus Contract gives homeowners full visibility over project costs, providing greater transparency and flexibility throughout the build. Instead of a fixed price, you pay the actual cost of labour, materials, subcontractors, and project expenses, plus an agreed builder’s margin.
Cost Plus Contracts are often preferred for renovations and extensions where existing site conditions can be difficult to predict before work begins. They provide a collaborative approach between builder and homeowner, ensuring decisions can be made as the project evolves while maintaining complete transparency.
Take a look at some of our recently completed renovation and construction projects.
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Drag the slider on each project to see the difference quality renovation makes.
See how COS Constructions compares to typical Sydney builders.
From concept to completion, we take care of every stage of your renovation journey. With clear communication, quality workmanship, and expert project management, we make transforming your home simple and hassle-free.
We begin by discussing your ideas, goals, and budget to gain a clear understanding of your project. Our team provides expert advice and guidance to help you make informed decisions from the start.
Once we understand your vision, we create a detailed plan tailored to your needs. Every aspect of the project is carefully considered to ensure a smooth and efficient construction process.
Our skilled team brings your project to life with quality workmanship and attention to detail. Throughout construction, we maintain clear communication and keep you informed every step of the way.
After completing the final details and requirements, we thoroughly inspect the project to ensure everything meets our high standards. We then hand over your completed space, ready for you to enjoy.
Speak with COS Constructions today and receive a free estimate.
Renovating can be stressful and you may have some questions, you will find all your answers here.
COS Constructions specialises in home extensions, kitchen renovations, bathroom renovations, laundry renovations, fit-outs, decking, pergolas, and general residential construction projects.
Absolutely. COS Constructions is fully licensed and insured, giving homeowners peace of mind that their project is being completed professionally and in accordance with industry standards.
Every project is different. Timelines depend on the size and complexity of the work, but we provide a clear schedule upfront and keep you informed throughout the process.
Yes. We work closely with homeowners during the planning stage to ensure every project is functional, practical, and tailored to their vision and lifestyle.
Some projects may require council approval, while others may not. We can guide you through the process and advise you on any approvals required for your renovation or extension.
In many cases, yes. Depending on the scope of work, we can often complete renovations while homeowners remain in the property. We’ll discuss this with you before construction begins.
COS Constructions services homeowners across Sydney and surrounding areas. Contact our team to confirm if we service your location.
The cost depends on factors such as project size, materials, finishes, and complexity. We provide detailed, transparent quotes with no hidden surprises.
We combine quality craftsmanship, clear communication, reliable project management, and attention to detail to deliver exceptional results that add value to your home.
Yes. We stand behind the quality of our workmanship and provide warranties in accordance with Australian building standards and applicable regulations.
At COS Constructions, we combine expert workmanship, quality materials, and attention to detail to deliver spaces designed for modern living and built to last.
From extensions, kitchens and bathrooms to complete home transformations, COS Constructions delivers quality renovations built to last.
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