Check EPA's site below for new construction Radon protection.
Radon-Resistant New Construction | Radon | US EPA
I know Richraft has the radon protection package which costed me $1200. I don't know how good it is since I havenot tested it, but at least it gives me peace of mind (my boss thinks me I am mad with this upgrade).
I guess Minto(in morgan's grant) or Urbandale(in kanata lakses) should have same upgrade. They normally do passive protection (plastic sheeting + piping). It would not be hard to make it active as long as you install the venting fan later.
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