Design errors’ impact on construction project costs

The construction industry is facing significant issues due to design errors, which can result in cost overruns, rework and safety hazards. Despite strict rules and procedures, errors are still prevalent and organisations need to address the problem adequately. This research aimed to investigate the impacts of design errors on the cost of a construction project. To achieve this, three objectives were set, namely (1) to identify the cause of design errors in the construction industry, (2) to investigate the impacts of design errors on construction projects and (3) to propose ways to mitigate design errors. A quantitative methodology and simple random sampling were used to collect and analyse data from architects, engineers, contractors and quantity surveyors. A total of 159 responses were collected. They were then analysed using descriptive, inferential statistics and the relative importance index (RII). The results indicated that human-related factors were significant contributors to these errors. The study also identified that design errors affected overall project cost, delayed project completion and decreased project quality. The utilisation of 3D modelling software, documenting and tracking design changes and using experienced and qualified design professionals is recommended to mitigate these risks. This study underscores the critical role of design in construction project success and provides recommendations for preventing design errors and improving project outcomes.