Traditionally a plan room was a literal room at an agency's office or a reprographics company, where a contractor could review or check out physical drawing sets. Today most public agencies run a digital plan room through their procurement portal. Registering to view a project's documents is also how a firm gets added to the planholder list.
Being listed as having accessed a project's plan room matters beyond reading the documents. It is frequently how an agency notifies bidders of addenda, answers to questions, and schedule changes. Missing that registration step can mean missing a change that affects the bid. Reprographics and construction-data companies also operate commercial plan rooms that aggregate documents across many agencies and private projects into a single searchable interface.
A plan room is where a project's documents live. Registering across dozens of agency plan rooms and checking each one for updates takes estimating time. Nonlinear can monitor plan rooms and procurement portals across a territory so a contractor sees new documents and addenda as they are published.
