Thinking about a home renovation? Kastell Building Co. specialises in high-quality, customer-focused renovations across Sydney and the Lower North Shore. From bathrooms and kitchens to extensions and first floor additions — we make the process clear, collaborative and stress-free.
Explore our full-service renovations - from bathrooms and kitchens to extensions and interior updates, all designed to maximise space, boost value, and suit the way you live.
At Kastell Building Co. we’re not just builders – we’re partners in bringing your dream home to life. As a husband-and-wife team we have over 15 years of construction experience. This combined with a background in technology and start-ups allows us to deliver you a unique, customer-focused approach to renovations.
We believe knowledge is power, and that's why you'll find free resources all over our site to help you in your building journey. We want to empower Sydneysiders to stop having terrible building experiences and start enjoying stress-free, seamless renovations.
Our blend of expertise allows us to combine innovation with craftsmanship, ensuring every project is tailored to your vision. Ready to learn more about who we are and how we can make your dream renovation a reality?
Discover more about our story and values below.
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Find answers to your questions about renovating in Sydney and Kastell can help you with your next project.
The duration of a home renovation depends on the scope and complexity of the project. On average, a full home renovation can take anywhere from a few weeks to several months. We provide a clear timeline during the planning stage to ensure you’re well-informed.
Kitchen renovations often deliver the highest return on investment (ROI), thanks to the kitchen's pivotal role in daily life and its ability to increase a home's value with modern appliances and high-quality finishes.
Transparency and trust are at the heart of every renovation project we undertake. That’s why we provide a comprehensive, upfront contract that clearly outlines all costs and expenses. Unless unforeseen issues arise after demolition, the agreed-upon contract price will remain unchanged.
Absolutely! Our team excels at crafting personalized renovation plans tailored to your vision and budget. We focus on innovative solutions and cost-effective strategies, ensuring exceptional quality every step of the way. A limited budget shouldn’t stand between you and your dream space—let us bring it to life!
At Kastell, we are dedicated to delivering exceptional customer service, clear and transparent communication, and superior craftsmanship. To us, every client matters—you’re never just a number.
Kastell specialises in a wide range of renovations, including full-home transformations, kitchen and bathroom upgrades, extensions, and knockdown rebuilds. We tailor our services to meet the needs of families, downsizers, and investors.
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