What does "interior trim" mean? Thank you very much for your comment. I'll check with our GC if it's real wood or MDF.

Just noticed -- no painting is included.

"interior trim" by itself has essentially no meaning. Way too many variables, from rooms that look like Buckingham Palace to minimalist MDF. You need to spell out exactly what you want in the specifications appended to your contract as to type, style, material, finishes etc. Based on your description I wouldn't assume crown is included. (nor wainscoting, coffered ceilings or any of the hundreds of other things you can do as part of interior trim.)

What is required for trim is baseboard and window/door casing.

Baseboard covers the gap between the finished flooring and the wall. Casing trim covers the gap between the doors/windows and wall. These are what would normally be included because they are required to finish the house.

Decorative trim includes crown moulding, chair rail, etc. While they look nice, these are optional and not normally included in a trim quote because they are not required to get a finished product.

I think it's just a punctuation problem.

interior trim, casing and baseboard

should actually read:

interior trim: casing and baseboard

ie. the interior trim is specified as just the casing and baseboard.

It has to be 'extra' because it can range from minimal moulding to huge, thick moulding. Standard will get you just enough trim to cover where two surfaces meet: Wall and ceiling; Wall and door or window cut-outs; Wall and floor.

MDF *may* be fine as ceiling moulding if you don't have extreme heat/cold seasons where it swells/shrinks. You don't want it in high traffic areas. BTW, I love our MDF interior doors; only do them if you will be painting them. They are solid, quiet -- and required three sets of hinges (36" wide doors).

Thank you for your responses, everyone. It has helped a lot.

crown is extra and requires an upgraded skillset to Nail

often requires blocking and scribework as well as compensating for angles. Material specific crown could be a risk vs reward situation as well.... custom profiled black wallnut stained crown may be $200 a stick and the carpenter starts sweating!!!

ill tell u what, id too charge for sweat and blood$$$

$15 a linear foot - does that include materials? We invested in the equipment (saw, nail gun, compressor, caulk, etc.), to do crown molding ourselves, and have attacked the job a couple of rooms at a time. We are using a classic profile in wood, and DH has gotten very skilled in a short time. We have a few rooms left to do. It is SO worth it - really finishes of the room and accents the paint job (we do that too).