We have a conventional foundation in a house built in 2001. There is now a 12-18 inch crack in the sheetrock ( very small, not deep) that goes from the top of a window sill at a 90 degree angle toward the ceiling. The outside of the house shows no cracks. Should I be concerned? Thanks a bunch for any help

This , unfortunately, is typical settling for any new home, repair as needed.

If you see some breaks in the LOWER sections of the house, namely the foundation,especially around the ground line, or below grade( if you have an exposed basement.) then you might have a concern.

With all newer construction, settling will occur,small areas of a home will move to account for the changes, even weather can make interior wood to expand and contract slightly, till its in a 'final' position.

Hope this answers your question,

Ken

Thanks so very much--that is what I was hoping to hear

KBC got this right. Did you also need to know how to repair this properly so it won't come back?

Yes , please, I would appreciate some tips on how to repair this THANKS

Hey Trippsdad, just curious but what did you click when you rated my answer. I got a gray mark on my history, the normal color is green fro agree and red for disagree. Which did you click? Now for the repair, lightly sand the crack, parallel with the crack 1"both sides. Put down a strip of fiberglass drywall tape straight down the crack, now cover with joint compound and feather the edge. Do not sand the compound but feather about 3 thin coats and then wipe with a damp sponge to get it smooth. If this cracks again do the same repair but buy s pecial repair patch that is like the tape but 3x wider.