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It is an offset rim?
Is it at the rear?If yes to both it probably won't explode on you but there's a reason rear rims are offset: To correct for the difference in drive/nodriveside spoke length at the back. (as the part of the hub with the cassette has to come "inwards" to make room for the cassette which affects spoke length..)
Instead of having 1.5mm between drive/nd spokes you can have them the same length/tension.
I don't know if your "wrong" way around is the way I am talking about. Worth asking about/complaining.
If they've done it wrong that way demand a rebuild cos it's just not right.
JWestland-
I have literally no idea about wheelbuilding - but if you check a pic of a bike with that make of rim you'll see they have text on them that, with the valve at the top of the wheel, reads "H Plus Son" at the bottom. My rear one no longer has that since the replacement, instead the text reads the wrong way... And yes, it is a rear wheel
Bezzin
Right - I recently noticed my LBS have managed to lace my rear archetype the "wrong" way round after I had the rim replaced. Aside from the obvious cosmetic irritation (it doesn't match the front), are there any grounds for me to ask them to rebuild?