Is there a database to seach by layout sizes?

[MountainMan]

Not necessarily track plans but a footXfoot imprint. I don't have a track plan but want ideas for the size of layout that I can fit a certain space.

Yes, there are numerous ones.

You can look them up by size and gauge o nth 'net, or you can find magazines containing literally hundreds of track plans by various sizes, or you can join MRR's site and scan their data bases.

Many of the track plans are "close enough" to fit your footprint with minimal alterations.