Can You Build a Duplex on a Corner Block? Here’s What to You Need to Know

If you own a corner block in Sydney, you might be wondering whether it’s suitable for a duplex. Corner sites can be a great opportunity for dual occupancy, but they also come with a few extra challenges that can impact design, approvals, and efficiency.

As experienced duplex builders in NSW, we’ve seen both the advantages and the pitfalls of corner block projects. Here’s what you need to know before getting started.

1. Primary vs Secondary Street Frontages

Every corner block has two road frontages — a primary and a secondary. Each has different setback requirements, and those setbacks can reduce your usable building area. It is important to understand which frontage council considers primary before designing, as it will influence where you can position garages, driveways, and entries.

2. CDC vs DA Pathway

Not all corner blocks can be approved under a CDC (Complying Development Certificate). Because of additional setback rules and visibility splays at intersections, your project may need to go through a DA (Development Application). During our Duplex Discovery process, we assess which pathway applies so you know exactly what to expect before committing.

3. Access and Driveway Placement

One of the benefits of a corner site is the ability to provide separate driveways for each dwelling. This can improve functionality, privacy, and resale value. However, there are council restrictions on how close driveways can be to intersections and services. A detailed duplex construction Sydney feasibility study will confirm what’s possible.

4. Services and Utilities

Corner blocks can make it easier to connect services such as water, sewer, and stormwater, but there may also be off-site works required on one or both streets. These are often overlooked by less experienced builders, leading to surprise costs later. At Neogen Homes, we factor in all service connections upfront so your budget stays transparent.

5. Maximising Value and Street Appeal

A corner block duplex has the potential to create two unique street frontages, giving each home its own identity. Smart design and material choices can help you achieve a premium look while maximising your investment. Whether you are planning a luxury duplex home in Sydney or something more modern and efficient, the goal is to balance aesthetics with practicality.

Corner blocks can deliver fantastic results when handled by the right builder. With the right strategy, your project can be both compliant and profitable — but it all starts with a proper site assessment and approval plan.

At Neogen Homes, we manage the entire process from design to approvals to registration. As a trusted Sydney duplex builder and custom home builder NSW, we make sure your project is feasible, compliant, and stress-free.

If you’re considering developing your corner block, check out our free Duplex Guide to learn everything you need to know before getting started.