Depends on the house. There was one ranch and one two-story plan they had I liked. the 2 story had 300 more sqft and was $2000 less. Another builder I looked at had a ranch plan that was about 50 sqft more than the first builder but lacked a 3rd car garage. It was $40,000 more, and their stuff isn't as nice...
I'd have to know what you're starting at, but it all depends on what's going in it and where that extra square footage is. If it's to make the kitchen larger, now you have more cabinets, tile, hardwood floors/tile whatever. If it's in the bedroom, you add a bit more wall and carpet.
And 1500 is tiny, but it also depends on what you're doing. Without a finished basement mine was ~1800 and even I thought that was small. But I grew up in a big house and I and my girlfriend each need our own office, so I went ahead and finished the basement. 2400+ ought to be plenty.
When looking at plans, keep a few things in mind
1) You're going to have to furnish it. if you can't find a way to use all the rooms the 2200 sqft, then it's too large. A guest bedroom easily becomes a kid's room so if you don't want to/plan to move for awhile, have to keep things like that in mind.
2) When comparing different sized plans, compare room by room. If the kitchen is 20 sqft larger, that's going to cost more than if the master is 20 sqft larger. Did the 1800 plan have a major change to the master bathroom? Putting a tub in mine in addition to a walk in shower was a few grand. The 1800 to the 2200 might not have that change.
3) Lot size. If these are ranches, the 1800 might be crammed on the lot and the 2200 impossible. My lot was smallish (partially because I didn't want to manage something 0.5 acre or more). Some of the ranch plans wouldn't have left me with much yard at all.
4) The plans have different size garages? A 3rd stall will add about $8500-$11000 depending on your builder.
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