Floor Gap

[John Pinkham]

II'm not sure how our contractor intends to hide his latest goof, but having a gap
in the kitchen flooring so that the top of the basement ceiling sheetrock is visible would seem to be a violation of a building or fire code. Any suggestions
as to which code is being violated?

Thanks

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[Joe Funderburk]

If the basement is unconditioned, then there is an air infiltration issue. Otherwise, it's just poor workmanship and an amateur installation that needs service by a floor specialist. No code violation off the top of my head.

[Raymond Wand]

A wood filler strip looks like its required.

[Chris McIntyre]

If I'm looking at the picture correctly, I believe what you are calling sheetrock is actually the backer board for the tile.
If the tile is laying directly on the basement drywall your contractor is worse than you thought!

[John Kogel]

Yeah, it just isn't finished yet. Seal the crack.
A gap like that should be closed off to the brick edge. Too hard to clean that little spider trap.

[Markus Keller]

I'm also not entirely sure what I am looking at. but here's a try.
In the back corner it looks like a missing tile; obviously that should be installed.
As far as the seam between the tile and the wood floor that is going to be a problem. It looks like it has been grouted. The grout will crack, come loose and pop out. The easy fix is to put a small wood threshold across the joint. That may not be what you want though. A metal threshold will probably look bad.
The contractor should have installed a control joint between the tile and wood or run the wood closer to the tile to make a clean caulk seam.
Schluter makes some nice control strips for this purpose. At this point you'd have to take out a row of tiles to get it in though.