"Value Engineering" is one of those oxymoronic terms that in reality means your carefully crafted plans and coordination are about to be busted apart so the contractor can credit the client 75 cents of every dollar he saves. I don't know of any certification for VE - it's mostly done by the GC and subs after the drawings are complete. The real danger is that they prepare a list of VE items that can gut important parts of the design or specification criteria, and you only later find that it's gone. I have a great story about low E glass on that issue.
My own preferred method of dealing with VE is to have it done at the end of the DD phase if that is at all possible. This works best when you have a contractor on board early in the process, advising on cost and constructability issues in the design phase. If you can do the VE in the DD phase, you end up with CD's that have the VE drawn and coordinated into the set, which provides much better quality control than trying to splice and modify at a later date. Plus, it's done before the subs complete their bidding/pricing, providing the client with a true savings rather than a partial.
If you don't have a GC on board in the design phase, options would include having one of the potential bidders do the VE work for a fee, which can later be rolled into the overall construction contract later as part of pre-construction services. Another option is to have an Architect perform a peer review of the project and offer suggestions.
Either way, the earlier the VE work can be done the smaller the impact will be on the timeliness, completeness, and quality of your documents.
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Klaus Steinke AIA
Las Vegas NV
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