Canada is one of those odd ones, they do use a lot of metric but some industries are still heavily imperial units like the building industry.  I grew up in BC and went to school there (K-12) so I'm quite familiar with their metric usage.  When I took my first physics and engineering classes at BYU it was quite a shocker to have to start using non-metric units.

I'm looking at an Australian floor plan right now and the first thing that jumps out at me is they call out height x width whereas in the US we call out width x height, now I am curious what other countries that are using metric are doing, specifically the UK, Norway and France.

The Australian system seems to be the following: window sizes are rounded to the nearest decimeter and shown in meters: (ie. a 1090mm x 2230mm window is called out as a 1022.  Doors on the other hand do not seem to be called out by height but only by their width in millimeters (ie. 820 for an 820mm wide door).

If the callout systems differ dramatically between countries I suppose I can add a global setting which allows the users to switch between various callout systems (for metric units).

I have been primarily focused on the imperial/US units during the development but I also realize that a lot of current users are utilizing the plugin in metric units.  I am not at all familiar with construction and construction documents in metric units so I need a little help here.

What I am talking about is the callouts for windows and doors.  What is the appropriate way to show these callouts in metric units?  What is common or accepted practice?

Probably a wise choice. It might be a difficult or even impossible task to get a wetlands fill exemption there.  You might search this forum for posts by a fellow named Adam Roby, who had similar issues doing a land search in New York State.  Lots of good info in those threads specific to where you are. I think ultimately he was successful.

Honestly, thank you all for the truly invaluable information given by each post.

I called the county zoning office who told me that because it was in the National Inventory, I would have to go through the Army Corps of Engineers for a permit, which would likely be cost prohibitive.  The parcel is in New York, btw, and only a couple of hours from NYC so it's still close enough to civilization that the restrictions aren't yet rural friendly.

I think all of this together makes this a deal breaker, sadly. But I'm very glad to have only spent a few hours and dollars on document fees instead of a few thousand on a potential (literal?) money pit. I'm so glad I came back to the forum! This is an incredible resource.

So onward I'll continue in my search for land, but for now I'll focus on the Yestermorrow course I'll be taking in a few weeks. Happy to share feedback on it once I'm done. Thanks again!

I would definitely make purchase conditional to a survey that the seller pays for, with completion of survey and positive acceptance of results by you a precondition to final offer. If the seller is serious about selling the property they will have to do this. They will likely kick and scream though.  I would probably ask the seller to take on the access issue too though that may drive price up.  Otherwise it is just a big gamble on your part.

You may also find after a survey that the boundary as is presented now is partially or completely wrong. That could be bad or good.

Also, perc test and water supply evaluation would be prudent.  You might agree to pay for those, as they are not that expensive.