Duplex Builders in South West Sydney
Two homes on one block need careful planning so each feels like a home in its own right. We talk through the site, who each home is for and what matters most on each side.

Two homes, one block
What to think about with a duplex
- Privacy between the two homes
- Where windows face, how the shared wall is treated and how each backyard is screened all affect how private each home feels.
- Separate entrances
- Each home usually needs its own clear front door, letterbox and path from the street, so neither feels like the back of the other.
- Layout priorities
- Bedroom numbers, living areas and garaging for each side. The two homes can mirror each other or be planned differently.
- Who each home is for
- One for you and one for family, both for family, or another arrangement. Who will live there shapes how each side should work.
Every block is different
Whether a duplex suits your site depends on the block itself and the planning rules that apply to it. We cannot confirm approval or subdivision in advance, but we can look at your block with you and talk through what you are hoping to build.
Before you get in touch
These details help us understand your site and goals in the first conversation.
Block address
The street and suburb, plus the block width and any survey you have.
Your plans for each home
Who will live in each side, and roughly how many bedrooms and bathrooms each needs.
Existing house
Whether there is a house on the block now, and photos of it if so.
Any advice so far
Anything you have already heard from council, a planner or a designer about the site.
Common questions
Can the two homes have different layouts?
Will my block suit a duplex?
Do you handle subdivision?
Let’s talk about your duplex
Tell Us About Your Project
Share a few details about what you have in mind.
Call 0415 288 474info@altechconstruction.com.au


