Housing Replacement cost per sq ft

Which island? 

There's no set number, only a range.  The replacement cost/sq.ft. will depend on the type of finishes you have in the house.  The cost to replace a structure with "builder's standard" finishes will be, by definition, lower than replacing a home with higher end "designer finishes".

Posted by: @afriend

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There's no set number, only a range.

That's probably why the OP asked for an "approximate amount"...

I recently got insurance and they asked me what I wanted to use as a replacement cost. I based it on what a major renovation cost me (after Maria). Almost everything (including the roof) other than the basic structure was redone in the renovation. So I extrapolated from that what a rebuild might be and it came to about $450 sq ft which I hope is generous enough. It's a smaller, 1100 sq ft home (2 bed / 2 bath) located on the east end of St Croix. The finishes would be considered upper mid-range - including hurricane windows / doors and an expansive deck. The structure is wood frame.

This isn’t exactly on point but I recently finished 3 car garage on the east end of St. Croix.  So nothing but a box, minimal electric from the house meter, no water but it was built on the side of a moderate hillside.  The construction was cement (combination of poured and block with a lot of rebar) so it’s a bunker for sure.  It ran about $160 per square foot and that’s only the structure, no landscaping.  My guess is for a house, with interior walls, plumbing, kitchens and bathrooms you’d need to more than double this number, $500 a square foot seems about right for a moderate finish level, but the sky is obviously the limit.