Asking an LBS to build a frame not bought from them

I've bought a few bikes from my local LBS. I've found a secondhand frame and I'd like them to build the bike for me from parts I have following a frame I have getting cracked. They had quoted me on a new frame, but TBH the secondhand frame is a bargain and suits my needs. I feel a bit awkard about asking them. Should I? First world problems eh

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It's just a hill. Get over it.
Eitherway - it's worth the ask - whats the worst they can say ... "No" ?
FWIW - I've just rang my local car garage to get a price on a filter change - I could do it myself, but it's quite convoluted to get to, plus it could be 1 of 2 different filters. Simplest to get the garage to do it if it's not too much - fortunately, it's a reasonable cost so they've got the work.
PP