Which should I purchase first the house plans or the lot?

If at all possible try to pick the lot and the plan at the same time.  In addition to looking at the width of the house you must also factor in between 24’ and 28’ for the drive and turnaround.   Also the subdivision set backs and easements must be taken into consideration.  If you have already purchased the lot and need to know what size house will fit on the lot, call me and I will be glad to set up a meeting with you to discuss your options.