Modern methods of construction: views from the industry
Summary of content
Background and introduction
Historical perspective and cyclical engagement with off-site manufacture, prefabrication and non-traditional construction since the Second World War. Introduces modern methods of construction (MMC) a generic term used more recently to embrace non-traditional and off-site approaches to construction of new homes.
The study, which was concluded in late 2015, included qualitative work with focus groups and a quantitative (telephone) survey. It engaged technical directors, technical managers, construction directors, construction managers from house building firms, and development directors and managers from housing associations.
The project invited consideration of a wide spectrum of MMC approaches, including:
- Volumetric (modular) manufactured units
- Pods (particularly bathroom and kitchen)
- Panelised systems (including open and closed panel timber frame systems, open and closed panel steel frame panels, structural insulated panels (SIPS), cross-laminated timber (CLT)).
- Sub-assemblies and components (including door sets, timber I-beams, prefabricated chimneys, prefabricated dormers, floor cassettes, roof cassettes).
- Site-based MMC (including thin-joint masonry and insulated structural formwork (ICF)).
The report shows the levels of engagement with these approaches among the participating house builders and housing associations.
Benefits of MMC
Participants were invited to highlight which drivers had encouraged them to use MMC and to identify any benefits from the methods they had used. Main benefits recognised included:
- Faster build programme
- Fast watertight envelope
- Improved build quality
- Reduced costs/improved profitability
- Improved site efficiency
- Improved health and safety
- Reduced site wastage
- Tackling skills shortages
For volumetric systems and pods, which were only rarely used by participants, the report sets out the experiences, insights and perceived risks that may be hindering wider uptake: these included concerns over capital costs, supply chain capacity and how to overcome the constraints of standardisation.
The study shows that many house builders and housing associations have a positive view of the future role of MMC. Over 45% of those taking part believed it will have a greater role in house building over the next three years. Only 3% thought its use would decline.