MTech. / This study discusses factors that impact on the implementation of sustainable design in KwaZulu-Natal. It aims to establish the interior design profession‟s understanding of sustainable design both nationally and internationally, and to identify factors that influence their sustainable design practices within an identified region in South Africa. A qualitative research approach was employed, and an interpretive paradigm chosen as the theoretical framework of the study. Data comprised of ten discursively orientated semi-structured individual interviews and focus group interviews. The research design consists of the collection, categorisation and analysis of data, as well as a review of the findings in relation to current literature. Conclusions showed that education and experience informs designer‟s understanding and values towards sustainable design. Designers‟ understanding and sustainable design values affect their behaviour, attitudes, and likelihood of practice in accordance with the constitution, legislation, policy and building regulations. These in turn determine whether they are blocked by barriers, by chance overcome barriers to find solutions, or strive to find solutions to overcome barriers. Barriers to sustainable interior design include education, cost, products and materials, rating tools and the client. Solutions that were established include improved knowledge of sustainable design, a change in the cost perception, improved knowledge and scope of products and materials, and educating the client.