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About Us

Duplex Building Design is a Building Design and Drafting business operating across the Illawarra, South Coast, Southern Highlands and Sydney regions. We offer building design and drafting services for new homes, duplexes, dual occupancies, granny flats, garages, carports, alterations and additions and townhouse developments. VISION: To be the premier building designer and draftsman in the Illawarra region MISSION: To create distinctive residential building design projects that respond to their environment by adding value through excellence in design and empowering customers by providing: - Excellence in design outcomes - Precise drafting documentation - Awareness of environmental impact - Sharing of professional knowledge - Clear communication - Supreme quality - Empowering leadership and teamwork - Unsurpassed customer service - Value for money

Services Provided

3D Rendering, Building Design, Drafting, Energy-Efficient Homes, Floor Plans, Home Additions, Home Renovating, House Plans, Pool House Design & Construction, Site Planning, Sustainable Design, Custom Homes, Green Building, Home Remodeling, Duplex Design, Dual Occupancy Design

Areas Served

Windang, Kiama, Shellharbour, Wollongong, Nowra, Berry, Sydney, Gerringong, South Coast NSW, Shell Cove, Cronulla, Camden, Lake Illawarra, Shell Heights, Warilla, Corrimal, Dapto, West Dapto, Albion Park, Oak Flats, Blackbutt, Flinders, kiama downs, Kiama Heights, Jamberoo, Geroa, Minnamurra, Barrack Heights, Barrack Point, Lake Heights, Port Kembla, Warrawong, Berkeley, Figtree, Farmborough Heights, Kanahooka, Horsley, Keiraville, Mangerton, Fairy Meadow, Towradgi, Woonona, Bulli, Thirroul, Austinmer, Coledale, Scarborough, Stanwell Tops, Stanwell Park, Helensburgh


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52 Projects

Home Designs

Gerringong Living, Alfresco & Pool

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Business Details

Business Name

Duplex Building Design

Phone Number

1300 310 067


Shop 1
Shop 1, 314 Windang Road
Windang, New South Wales 2528

Typical Job Cost

$50,000 - $3 million

We offer a set rate fee proposal from the start. All pricing is dependant on the scope and scale of the project.


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