InSite | What is the MMC Definition Framework?

What is the MMC Definition Framework?

Modern Methods of Construction is viewed as a genuine answer to the problems facing the residential housing market, specifically around the volume of homes being produced.


Incorporating many different types and processes of construction, and with differing terminology for these, what the general term ‘MMC’ actually means often feels quite disjointed and unclear. 


However, the term MMC has now been regularised by a government working group, hopefully leading to a clearer and more widely accepted understanding of MMC, what it incorporates and the different forms it can take.


Premier Guarantee are advocates of the use of MMC in construction, releasing an eBook on managing risk in MMC, as well as having a comprehensive and recognised Product Approval process.


What is the MMC Definition Framework?


The Modern Method of Construction Definition Framework is a new framework consisting of 7 categories. Its aim is to create a better understanding of ‘Modern Methods of Construction’ used in housebuilding through a regularised terminology.


The MMC Definition Framework covers all types of pre-manufacturing, site based materials and process innovation.


Building Typology & Material Genre


Before discussing categories, the MMC Definition Framework outlines four types of buildings:


  • Houses
  • Low rise apartments (<5 storeys)
  • Mid rise apartments (6-9 storeys)
  • High rise apartments (10 storeys and above)


It also lists material type, which only apply to structural categories 1-4a:


  • Mass Engineered Timber (MET)
  • Timber framed (TF)
  • Light gauge steel framed (LGS)
  • Hot rolled fabricated steel (HRS)
  • Hot rolled / light gauge steel combination (SC)
  • Concrete & cement derived (C)
  • Timber framed / concrete combination (TFC)




There are 7 categories within the MMC Definition Framework.

Category 1 – Pre-Manufacturing - 3D primary structural systems

Category 2 – Pre-Manufacturing - 2D primary structural systems

Category 3 – Pre-Manufacturing - Non systemised structural components

Category 4 – Pre-Manufacturing - Additive Manufacturing

Category 5 – Pre-Manufacturing – Non-structural assemblies and sub-assemblies

Category 6 – Traditional building product led site labour reduction/productivity improvements

Category 7 – Site process led labour reduction/productivity improvements


Read the full MMC Definition Framework document.