Maretha grew up in Kuilsrivier in the Western Cape. After she completed her diploma in Interior Design at Intec College, she enrolled at CPUT where she completed her BTech (Applied Design) degree in 2006. She completed her post-graduate studies at UP and obtained her M(Arch)Prof. degree in 2009.
She worked on several residential, commercial & institutional projects during her years at MLB Architects & Urban Designers. In 2009 she joined an automotive cosmetic company as concept & project architect and created the new design for their franchises. After traveling to Ireland & Europe, she returned to MLB Architects & Urban Designers in Cape Town in 2011. She joined GLA in 2012.