We have an Outwell Hartford XL for 2 Adults and 2 children which has a footprint something like 7 x 7M (or just over). Only since we bought it have we had to take note of site policies on sizes.
We have found quite a few sites that have a 6 x 6M standard limit for tents.
How they handle going beyond that varies from wanting to charge for two pitches or having an additional fee for "large tents".
In general though, i have no regrets in enjoying the extra space and freedom and the tent is easier to pitch than my old and smaller "ProAction" one and I see lots of Big tents these days anyway.
I would think the size you suggested will not cause many problems except perhaps at the most stringent of sites.
------------- Outwell Hartford XL
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