House Plan Designers

Our company ‘Duplex Building Design’ provides a flexible and professional approach to designing house plans. Our team of qualified House Plan Designers have over 18 years of design and drafting experience. The major areas we service include Illawarra, South Coast and Sydney, providing a stress free experience so you can begin construction with minimal fuss.

duplex House Plan Designers

New Homes

duplex-1 House Plan Designers


Addtions House Plan Designers


two-buildings House Plan Designers

Dual Occupancies

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Town Houses

house House Plan Designers

Granny Flats

House Plan Designers

We’ll take care of your house plan designs from beginning to end, a complete and hassle free experience.

Register for a free consultation & design brief checklist


"We used Nathan and his team at Duplex Building Design for our dual occupancy design at Oak Flats, we were very pleased with how professional Nathan was, he listened to our ideas and was able to gain approval in council with minimal fuss. The whole process was professional and smooth and will be coming back for our next investment project."
Mark and Linda Davie
Oak Flats
"We were blown away by Nathan and the way he helped us with our renovation design and granny flat on our property at Cronulla. We had a bad experience with the previous designer so came into this process nervous, Nathan was professional and easy to communicate with, he helped us through each stage of the process from the initial design through to the council approvals. Our project is approved and we are looking forward to starting. We can’t recommend Nathan and his staff more highly enough."
Sally Robson
"This was the first time we had plans drawn up and was not sure what to expect. Nathan was prompt and listened to what we wanted with our unit development and provided exactly what we asked for as well as two other options to show what could be achieved. We needed one small revision which was completed within 4 hours and we are extremely happy with the service. We will defiantly use Duplex Building Design again in the future."
Debbie Humphrey

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