In Grande Maison, you should be able to count on quality construction and high building standards. That being said, both gas and electricity are much higher this year than last, and they will run proportionally different each season. You can count on your water, and heat being gas, then other items electric. Electricity during peak months will probably run around $400 with your gas about $75-100. Of course this is an average. When I am marketing a resale home, that is information that I have my home sellers provide, because most buyers want to be able to calculate what their total monthly bills will be.
If I can be of any assistance in your buying process in the Mandeville area, I would love to work with you.