Knockdown Rebuilds we’ve designed
Knockdown Rebuilds we’ve designed
Explore past knockdown rebuilds we’ve designed in Sydney. See how we've transformed outdated homes into modern custom builds.
Knockdown Rebuilds in Sydney
Rebuild the home you really want.
It’s time to upgrade your knockdown rebuild experience. Get expert advice from Sydney’s trusted rebuild specialists at Kastell Building Co., and create a custom home that’s modern, practical, and built for your block.
🧭 Plan your rebuild with a licensed builder
📐 Discover smart designs for tricky sites
🔍 Compare options to suit your budget and goals
📝 Receive a fixed-price, detailed proposal
Knockdown Rebuild Price Guide
Rebuild Guide for Every Block
View indicative price guides for knockdown rebuilds in Sydney. Compare costs for small homes, duplex builds, and custom family homes.
No items found.
Why Rebuild with Kastell?
Full-Scope Project Delivery
From approvals to handover, we manage your entire knockdown rebuild with structured planning, experienced oversight, and zero guesswork.
Smarter Block Utilisation
We optimise your new home design to suit your site’s orientation, slope, setbacks and access — maximising long-term value and liveability.
Transparent Fixed Quotes
No lump sums, no grey areas. Our quotes are detailed and line-itemed so you know exactly what you're paying for, and where you can adjust.
Certified & Fully Insured
As licensed builders, we provide HBCF home warranty insurance, public liability cover, and full compliance with NSW building codes no shortcuts, no stress.
Pro-Level Project Tracking
You’ll get full access to your project’s live schedule, updates, and photos - so you’re never chasing us for answers. Our systems are built to keep you in control.
Built to Comply
We go beyond bare-minimum compliance. From waterproofing to fall gradients, we build to exceed NCC standards so you don’t end up fixing leaks, mould, or drainage issues later.
Our Trusted Partners
No items found.
Our Process
How we manage your rebuild
Planning
We assess your block, goals, and budget to map out a tailored knockdown rebuild strategy, including DA or CDC approval paths.
Design & Quote
You’ll work with our team to design your new home. Then we’ll provide a detailed, fixed-price contract with full inclusions.
Demolition
We manage all site prep and demolition work, ensuring safe removal of your existing home and clearing the way for construction.
Build
Your new home starts to take shape. Kastell coordinates all trades and keeps you updated through each stage of the build.
Handover
We walk through your new home together, check every detail, and hand over keys along with warranties, documentation and care info.
Get Inspired
Design ideas for your new home
Browse our Pinterest boards for knockdown rebuild inspiration including custom layouts, façades, finishes, and interior ideas.
Start your KDR journey
Ready to Rebuild with Confidence?
Book your free knockdown rebuild consultation. Get expert advice, site review, and a fixed-price quote based on your block.
FAQs
Questions About Rebuilding?
We answer the most common questions about knockdown rebuilds in Sydney including approvals, timelines, and pricing.
How much does a knockdown rebuild cost in Sydney?
The cost of a knockdown rebuild in Sydney typically ranges from $600,000 to $1,200,000+, depending on design, block conditions, and finish level. At Kastell, we offer detailed, fixed-price quotes so you know exactly what to expect. Learn more in our cost planning blog or explore official NSW planning guidelines.
How long does a knockdown rebuild take?
Timelines can vary depending on factors like design complexity, permit approvals, and site preparation. On average, a knockdown rebuild takes 12–18 months from the initial consultation to move-in day. Our team provides a clear, detailed timeline during the planning phase to ensure transparency and set realistic expectations.
What does it cost to build a new home?
The cost to build a new home in Sydney varies widely, from $2,000 to $4,000 per square metre. For a knockdown rebuild, site complexity, design choices, and inclusions all play a role. Kastell provides honest, itemised pricing. Use a cost calculator or book a free consultation to get a personalised estimate.
Can I keep my current landscaping, pool and gardens?
It depends on your site's access and design. In some knockdown rebuilds, existing pools, retaining walls, or established gardens can be retained. Kastell will assess this during your site inspection and provide advice on what can be preserved or repositioned.
What are the pros and cons of a knock down rebuild over a renovation?
A knockdown rebuild gives you a brand-new home without compromise, often at a better cost per square metre than major renovations. Renovations may retain charm but can hide costly surprises. Learn more by exploring our free renovation blueprint.
Can you knockdown rebuild your home if you still have a mortgage?
Yes, but you’ll need lender approval before proceeding. Most banks will allow a knockdown rebuild if the property’s value and your equity support it. Always check with your lender early. Kastell can guide you through the steps during your consultation.
What is included in a knockdown rebuild quote?
Kastell’s knockdown rebuild quotes include demolition, site prep, design, approvals (DA or CDC), and detailed construction costs. We break down inclusions clearly — no hidden extras. Learn what to expect in our guide to building contracts and HBCF insurance.
Testimonials
What Our Clients Say
Hear from Sydney families who rebuilt with Kastell. Real stories of great design, clear communication, and trusted results.
"Kastell made the entire rebuild feel easy. Clear communication, great design, and a result that feels like home. Highly recommend!"
Sarah & James
Knockdown Rebuild, Lane Cove
"We loved working with Cam and the Kastell team. Our new home suits the block perfectly and the process was surprisingly smooth."
Elise & Mark
Knockdown Rebuild, Mosman
"From demo to handover, Kastell delivered exactly what we needed. The team was professional, responsive, and nailed the brief."
Anna & Tom
Knockdown Rebuild, Naremburn
Blog
Rebuild Advice from the Experts
Learn from our trusts Sydney builder & knockdown rebuild expert Cam with practical tips, cost insights, and planning advice to guide your journey.
Free Resource
9 secrets for a stress-free renovation
Your essential guide for renovating in Sydney. Avoid costly mistakes and stress in your next renovation – Get our free guide now!
