In partnership with Edinburgh Napier University, Harlow Consulting was commissioned to investigate risks and issues posed by volumetric construction and assess potential changes to the regulatory framework. The scope of the research was limited to one type of Modern Methods of Construction (MMC) – offsite manufactured volumetric construction (Category 1 within the national MMC framework).  

This research was informed by a comprehensive evidence review of published literature and data (academic literature and module connection/product/materials testing/modelling data, grey literature, industry guidance, regulatory approaches, technical manuals). This was supplemented by a further evidence review of unpublished sources shared by respondents to the online consultation and industry stakeholders interviewed for this research (product/systems manuals and guidance, unpublished internal research undertaken by volumetric manufacturers relating to product safety, fire testing and product testing). 

Semi-structured depth interviews were undertaken with over 60 industry stakeholders, product/systems manufacturers, trade and professional bodies, consultants, building control and insurers. An online call for evidence achieved 53 responses with findings synthesised with the rest of the evidence. 

The research had expert input throughout, from a dedicated Steering Group which we recruited, of over 30 individuals to represent the breadth and diversity of the Modern Methods of Construction (MMC) sector, including employers, professional bodies, warranty providers, academics and regulators in the four UK-nations. 

The research conclusions highlight the risks in volumetric construction which have potential to become systemic, due to the likelihood of repetition, and the risks in volumetric construction which are deemed to be elevated, in comparison with traditional construction, or relevant only to volumetric construction.