AJA x MHDP directors (l to r): Donald Johnston, Jim Allman, Mark Hurcum and Benjamin Johnston

Allman Johnston Architects and MHDP Architects are pleased to announce the establishment of their joint venture partnership to service the Southern Highlands and Sydney regions.


From MHDP Principal and Director Benjamin Johnston:

The MHDP and AJA amalgamation is really looking at more than just continuing current AJA projects. We see this partnership as an opportunity to continue the AJA brand and reputation for doing great work in the Southern Highlands. Our combined entity for the Southern Highlands – AJAxMHDP Architects – is testament to that and we are looking to grow our role in the area.

My personal connection with the Southern Highlands extends well back into the distant past. For those who may not be aware, my father is Donald Johnston, who started AJA in Bowral with Jim back in 1993 after 25 years of sole practice in Sydney. But even earlier than that, we have been visiting family in the Southern Highlands all my life so it felt entirely natural to make this decision to branch our firm into the area.“


Allman Johnston was established by Jim Allman and Donald Johnston in Bowral in 1993 and is one of the premier architectural firms in the Southern Highlands. Jim Allman is well known across the district and has an established knowledge and experience in planning matters across the region. 


MHDP Architects, formally Mark Hurcum Design Practice, was started in 1991 by Mark and Linda Hurcum to explore a positive synergy between design and business. After more than 30 years in practice, MHDP Architects has a proven and enviable reputation producing some of the best homes in Sydney and beyond.

MHDP Director Benjamin Johnston is excited to continue the family association with the Southern Highlands, while maintaining MHDP Architects, North Sydney. AJA x MHDP have already collaborated on a number of projects including the successful Renwick Community Centre for Landcom/Wingecarribee Council.