Hi, I'm new here. I would be grateful if anyone with more carpentry experience than I have could share any trade secrets about how to get a custom door the size you need it. Nine weeks ago, I went to Lowe's and ordered a custom-sized prehung closet door for an irregular rough opening in an old house. I ordered a "net unit width" of 21 3/4". The corresponding RO size for this unit size would be 22 1/2", but that's really irrelevant since the RO is irregular--I want a unit size of 21 3/4", no more and no less. So the door came in and I measured it before taking it out of the store, and it was too small at 20 3/4". After a few weeks they never reordered it, so I got my money back and went over to Home Depot and ordered the exact same size door with a unit width of 21 3/4". Two weeks later the door came in and it was 21" exactly. So I got my money back and reordered it again, and today it came in and it was still too small at 21 1/16". This time I got my money back, and I really don't know what to do next. I'm thinking about just drywalling over the closet and forgetting the whole thing, but I thought I'd check on here first... just kidding. My question is, how can I get someone to make me a prehung door so that when I pull out a tape measure and measure between the outside frame edges it will be 21 3/4", no more and no less? I know I could use one of the smaller doors they sent me and shim it, but it would be a difficult job with an ugly result, as I would be shimming a space over 2" and would have to use a larger molding than all the others in the house, or do a half-baked plaster patch to fill the space. I really want the right size door. Since all three doors I ordered before came in at slightly different sizes, it doesn't seem like its the same mistake each time. If anyone has any ideas, thank you very much in advance.

Hi everyone.. I will like to know if there´s any tipe of standard for window frames and if i can find them online. Thanks in advance!!