Extension design and build


One Design and Construct is the winner of Master Builders Housing Excellence Award 2016
for the Alternation and Additions $150,000 to $200,000 category.

Small house on a large block? Add another floor?

Whether you are looking to expand your living space with an extension, second floor or a deck, we have the solution. If you love your home and the area where it is in, don’t go to the drastic step of selling and relocating. You always have the option of adding a second storey or extension to your home.

Ready to design and build your extension with us? 

Contact us

Not yet? Have a look at our recent projects showcasing intelligent design, high quality craftsmanship, and finishes.

Award winning extension/alteration project in Applecross (before and after)


Leeming house extension with garage and office build (before and after)


Hilton Heritage House restoration and extension (Before and after)


Cottesloe dinning and lounge on the ground floor extension (before and after)

Talk to us about designing and building your extension! 

Contact us

Website Photography and Development by Songy Knox