Bids will vary widely. On a recent repair job I was involved with, bids came in anywhere from $300 to $2500. Check around (and of course, check references, and make sure the exact same specs are given to the contractors).

It's going to depend on the available contractors in your area. Any estimates you get from us are going to be practically worthless.

Go take a gander at a big bookstore and locate the latest editions of the Means Construction Estimator books. They publish volumes for residential new construction and for remodeling.

Then you figure out how to factor in your job description, and location and then you'll be able to work out ...... well, a ball park, anyway. But at least it's a jumping off point.

For modest repair jobs, the cost is going to all over the map depending (mostly) on how convenient it would be for the trades to fit it into their other commitments. And with plaster you definitely want to don't want to go with a jack of all trades; you want a skilled plasterer. Almost every area has at least some guys who know how to do this, but it does take digging around to find them. (Ask at masons' supply stores.) Perhaps you'll discover someone who wants to moonlight on such a small job.

Good luck, glass-smooth plaster is a joy to behold, and worth the trouble to keep in good repair.

Molly~