Duplex builder in Concord

Concord’s wide streets and large blocks have made it one of the most popular suburbs in the inner west for duplexes. AGA Building is a family-run, licensed builder based in Rydalmere, just across the river. We design, get approval for and build duplexes, and Andrew supervises every job on site.

Can you build a duplex in Concord?

Concord is in the City of Canada Bay, and most of its house streets are zoned R2 Low Density Residential. Canada Bay has allowed duplexes in R2 zones for years, and its minimums are lower than many nearby councils’, so more Concord blocks qualify than you might expect.

Where your block is	Minimum lot size	Minimum width
Attached duplex, anywhere in Concord (Canada Bay LEP 2013)	450 m²	14 m
Detached duplex (two separate homes)	800 m²	17 m
Within the mapped area near Concord town centre (Majors Bay Road), Concord West station or North Strathfield station	450 m²	12 m

Because Canada Bay’s attached minimum is already 450 m², the station-area rules mainly help narrower blocks, between 12 m and 14 m wide.

Heritage in Concord

Concord has heritage conservation areas and many heritage items, including the 1920s Yaralla Estate conservation area. A duplex may still be possible in or next to these areas, but the design has to suit the streetscape and usually needs a heritage report and a DA. We check this first, so you know early whether heritage will shape the design.

Other things we check on Concord blocks

• Flooding. Blocks near the Parramatta River foreshore, the bays or low-lying streets can be flood-affected.
• Trees. Concord has many large street and backyard trees that can affect where the homes and driveways go.
• Height. Canada Bay’s 8.5 m height limit is lower than in some councils, which shapes two-storey designs and roof forms.
• Corner blocks. These can sometimes fit two homes facing different streets.

CDC or DA in Concord?

A regular block outside heritage areas that meets every standard may suit a complying development certificate (CDC), which is usually faster. Heritage, flood-affected and irregular blocks normally go through a development application (DA) to the City of Canada Bay. We work this out at the start and manage the approval for you.

Duplexes we’ve built

We’ve designed and built duplexes in Ermington, West Ryde and Rydalmere, and we also build in nearby Strathfield and Ryde.

How we build your Concord duplex

1. Free block check. Zoning, heritage, flooding, lot size and width.
2. Design. Plans that suit the street, the height limit and your goals.
3. Approval. CDC or DA with the City of Canada Bay, including heritage and arborist reports if needed.
4. Demolition and construction. Andrew runs the site and keeps you updated.
5. Handover. A final walkthrough, with every certificate and warranty document.

Concord duplex questions

My block is 450 m² but only 13 m wide. Can I build a duplex?

If it’s inside the mapped area near Concord town centre, Concord West or North Strathfield station, the 12 m minimum may apply. Outside those areas, Canada Bay’s 14 m applies, though a DA can sometimes allow a small variation.

My house is in a heritage conservation area. Is a duplex still possible?

Possibly. NSW rules now allow duplexes in R2 zones including heritage conservation areas, but council will assess how the design fits the area, and some houses must be kept. It’s worth getting advice before you design.

What will a Concord duplex cost?

It depends on the size, finishes and any heritage or flood requirements. Our duplex cost guide covers the main costs, and we’ll give you a realistic budget once we’ve seen the block.

General information, current as of October 2026. Planning controls change, so always confirm the rules for your property with the City of Canada Bay or a certifier. Sources: City of Canada Bay (2023), NSW Planning – Low and Mid-Rise Housing Policy.