The construction industry in Malaysia is very important for creating employment, both directly and indirectly. It faces two repeated problems during the construction stage: slippage of project-schedules, i.e. time overrun and overrun of project cost; to the dislike of owners, contractors and consultants. This paper studies the time delay and cost overrun factors for Design and Build D&B projects in Malaysia. A Questionnaire was used to collect data from practitioners and analyse the responses and rank the factors and groups on overall view of the contracting parties. Identified risk factors from the theoretical domain were used to prepare 79 time related question and 18 cost related question categorized in 9 groups and 1 group respectively. Total of 136 respondents recorded their ratings to the factors in the questionnaire. Labour-related group has the top 1 rank with RII 0.684. The results can be used as a guideline to successfully handle construction projects in Malaysia; contributing for better project performance and lead to positive risks, opportunities. © (2012) Trans Tech Publications.