Your appliance dealer should have advised you regarding any necessary permits and assisted you in lining up the necessary contractors to install your appliances. Heck, the big box stores do that in my area.

Yeah, it’s weird an a little annoying, actually. I bought my stuff from a very reputable (from everything I could find) appliance dealer here. I asked more than once for who they coordinate with for this kind of work and was told to just contact my HVAC person for the ductwork and see who they use for the roof venting. It left me confused.

Typically, a mechanical contractor will mount the hood and install the necessary duct work including a roof cap. Depending on the particulars of your roof, you may need a roofer's help to complete that. If you're not replacing a similar vent hood, you may need an electrician to wire for power and controls.

If your state's building code incorporates the International Mechanical Code, you may also be required to install a make-up air system for the vent hood, if the exhaust flow rate exceeds 400 cfm.

Last, but not least, is that your project, albeit small, may required one or more permits. In our area, permits wouldn't be required for an in-kind replacement, but would be for installation of a new hood where there was none previously.

My kitchen work is being done with both a building permit and an electrical permit, and the electrical rough in is done for this eventual installation. The confusion I think is that I’m buying the range and range hood independent from the KD effort, and having those parts installed (up to the ceiling), so I think there may be some confusion as to the hand off for the venting and making sure it falls under the existing building permit. I’ll have to talk with the construction supervisor on Monday. Hopefully this didn’t fall through the cracks.

Hopefully you have a licensed contractor coordinating the work and not a kitchen designer functioning as a general contractor without a contractor's license.

I found out a long time ago that client-supplied fixtures or appliances and/or portions of the work to be coordinated and/or performed by the client typically result in bad outcomes for the contractor (e.g., longer times to completion, damage to already completed portions of the work, rework, warranty issues, additional complexity and administration, additional client handholding, debates over change orders, etc.) Many experienced contractors won't take on such projects-- and particularly in markets where there is more demand for contractors than there is supply.

While that may be the unfortunate truth, I can’t do anything about it now. To say that this kitchen remodel has been a study in frustration is an understatement - but virtually all of it has come from delays (scheduling or materials) all on the side of the job that is NOT under my control (but under GC’s control), and not due to anything that IS under my control. So far.

Hold my beer.