The RIBA Principal Designer Professional Services Contract is for the appointment of a Principal Designer under the CDM Regulations 2015 and is suitable for commissions procured on any form of procurement for simple, non-complex, commercial projects of any value, in which the works will be carried out using forms of building contract, such as the RIBA Standard or Concise Building Contract, the JCT Minor Works Building Contract or the JCT Intermediate Building Contract.