Replacement cost are based on many factors. Age of home, architecture style, upgrades inside and out, roof type, how many floors, type of counters, types of sinks, etc. Two homes right next to each other with the same square footage and built by the same builder will still have different replacement costs. We write a lot of insurance policies and we have to use special software to calculate replacement costs.
The generic number by the way is $150. That is never accurate but gives you a VERY rough idea at what you would be looking at for replacement cost. Don't forget, attached garages will increase your replacement cost because they are considered part of the home since it is attached.