Sleeve shortening really depends on the sleeve. I had my regulation doublet sleeves shortened at the best local tailor I could find (which was a bit more than the others, but I really wanted quality here). I was initially quoted $15 (US), but that quickly increased to around $40 when it became apparent that the gauntlet cuffs with holes for the button shanks going all the way through required the sleeve to be shortened at the shoulder rather than the cuff.

Having once attached the sleeves to a shirt, I can completely understand the cost.

I had some trousers let out in the waist as well, and that was in the neighborhood of $15.