369 Building Design is a creative building design office that facilitates the creation of harmonious spaces that people love to live in that adhere to the three principles of good architectural design: durability, utility and beauty. Our intention is to create designs that celebrate the experience of spaces, and life within them. Our holistic approach aims to consolidate functional and practical principles of beauty, nature, energy of spaces.

Our specialty areas involve Multi-Unit Developments and Town Planning applications as well as new designs for private residences, renovations, extensions and commercial. We can also assist in site selection and provide remedies for the transformation of existing home or work space environment.

Mariana Gagula is both the principal of the 369 Building Design practice and the projects design director. With 20 years experience in the Building Design and Construction Industry she leads the design and consultation process.

Happy Customers

  • This is just a short note of gratitude to thank Mariana of 369 Design for her great effort in designing our two Townhouses in East Keilor which fetched a record price at auction for the area last weekend. Due to her vision, innovations, product selection and analyses of trends, her high calibre of work has given the street and the new occupant’s two units of highest design and value. Mariana was easy to work with. Decision making was made clear and concise as well as prompt with design changes. I look forward to working with you again in the very near future.




Level 1, 151 Lygon Street
Carlton VIC 3054

P.O. Box 211, Carlton
South VIC 3053

M : 0403 044 362
P : 03 8595 9100
E : info@369design.com.au