What is the gap at the end? It looks like it's off by about 1-1/2".

What does the other side of the window look like?

Is this a drywall ceiling or plaster?

Lots of ways this can be fixed just have to find the best solution for your specific situation, what does your contractor suggest? He is there onsite, what suggestions does he have?

Yes it’s a huge gap. At least 1 1/2”. Other side of the window is fine. Just the ceiling in this corner of the room is way unlevel. Dry wall ceiling.
My thought is to remove the crown molding. Then run the crown molding against the ceiling. It will look very slanted against the cabinet but maybe this way is better than this huge gap?

If the other side is OK and cabinets on each side of the window are level and only that corner is the issue, it sounds like the ceiling/drywall is riding up in that corner only... Drop the drywall to hit the crown, that should solve the problem... it will level out the ceiling and close the gap.

How do you drop it? From the attic? That foes make sense.

Take a piece of wood and scribe the gap on to the wood to get an exact piece that will fit into the gap. Pull the molding and glue and staple the piece to the top of the molding and reinstall.

It still will look a little goofy but won't be as goofy and in your face ugly as you have now.

If your contractor doesn't understand or doesn't have a subcontractor or employee who doesn't understand what I described or know what to do then none are worthy of a title as millwork and finishing carpenter, I was told 40 years ago the difference between a novice carpenter and a good carpenter is a good carpenter is able to coverup mistakes.

The “right” way to fix this is to remove the upper cabinets, remove the ceiling drywall where it is high, add shims to the joists, screw on new drywall, and finish with mud and paint, and reinstall the uppers.

A ”not quite right” way would be to simply add some thin (1/4”) drywall to the problem area (where the ceiling is more than 1/4” too high), using shims to get it level, and use mud to fill and smooth the rest. You don’t have to remove the uppers, just remove the crown molding, cut the 1/4” drywall to fit the cabinets, then replace the molding.

Filling the gap with a piece of trim painted to match the ceiling will work too. Yes, you’ll see it if you look but will you - no-one else will. No, it’s not the “right” way but we all jaywalk occasionally, it doesn’t make us criminals.

I’d say, see how much your contractor will charge, then decide.

Myself, I’d do the “not quite right” fix. The ratio of ”how much of a hack” to ”effort saved” is the best, in my hack opinion.

Thank you so much for your willingness to help me. I paid to have floors leveled. Now I realize I should have paid to have the ceiling leveled. Lesson learned for the next life. This is just what you get with 100 year old house. I’ve spent too much money already. Decision made to camouflage the gap with trim pieces between the crown and the ceiling in this corner. Again, thank you. Always good to have a second opinion. 😊

Second opinions are good and qualified contractors are even better.

Old houses are a labor of love.

What does the contractor suggest?