Duplex and new home builders in Sydney
We design, get approval for and build duplexes, new homes and knockdown rebuilds across Parramatta, Ryde, Epping and the surrounding suburbs. A family-run, licensed builder based in Rydalmere, with Andrew on site for every job.
Could your block fit a duplex?
Since July 2024, NSW allows duplexes in most low-density (R2) zones, and newer rules near some train stations allow smaller lots. Many blocks that couldn’t take two homes before may now qualify. Send us your address and we’ll check the zoning, lot size, width and any red flags for free.
What we build
Duplexes
Attached and detached duplexes, from design and approval to handover. Our specialty for more than 10 years.
New homes & knockdown rebuilds
Knock down the old house and build new, or build a custom home on your block.
Renovations
Kitchens, bathrooms and whole homes.
Extensions
More space without moving.
Recent projects
What our clients say
“Andrew at AGA Building built two duplexes for me to an exceptional standard — and I managed the whole thing from overseas with complete peace of mind. A to Z project management — delivered on time and on budget, no surprises.”
Carolina G. – two duplexes
“The team was professional, reliable and delivered outstanding workmanship from start to finish and their attention to detail was exceptional.”
Hambik M. – home renovation
★★★★★ 5.0 on Google – read our Google reviews
Why AGA Building
- Licensed and insured NSW builder (licence 215084C)
- Over 25 years’ experience in construction
- Every project supervised on site by Andrew
We mainly build in Parramatta, Ryde, Epping, Carlingford, Eastwood, Ermington, Dundas, North Rocks and the nearby suburbs of the Inner West and Lower North Shore. See the areas we cover →
Common questions
Do you do renovations and extensions as well as new builds?
Yes. We build new homes and duplexes, and we also renovate and extend existing homes. It’s where our business started over 20 years ago.
Can you help with design and approvals?
Yes. We can manage the whole design and approval process, whether that’s a CDC or a council DA, with our local consultants, or build from plans your own architect has prepared.
Can I build a duplex on my block?
Since July 2024, NSW allows dual occupancies in R2 low-density zones with development consent, but minimum lot sizes and other rules vary by council. Send us your address and we’ll check it for free.
How much does it cost to build a duplex?
It depends on the size, the finishes, the block and the approvals needed. We’ve broken down the main costs in our duplex cost guide, and we’re happy to give you a realistic budget for your site.
Planning a duplex, new home or renovation?
Call or send us a message and we’ll talk through what’s possible. Thinking about a duplex? Start with a free block check.