MIS 3005-D vs MIS 3005-I: who designs, who installs, who signs
MIS 3005 split into two documents on 1 April 2022 - one for design, one for installation. Most growing UK heat pump installers still treat them as one workflow, and that's where the data leaks. A practical guide to the design-to-install handoff for scaling installers.
Jamie Duncan
11 May 2026
