new construction plans

[Pedro Florentino]

Hello everyone, and thanks ahead of time for your help and advice.  

 I'm looking to build a 2500 sq ft two level ecofriendly single-family home which incorporates natural surrounding into the design, I'm trying to figure out what my cost should be for architectural plans: elevation, floor plan, mechanical, plumbing, electrical, etc.  

I assume that it may also be cost effective to go with a builders templated design as the design docs have been completed and approved by city? Alternatively, I could go with a custom design; what should be a ballpark price for all architectural and construction related plans?  

also, I'm assuming an average construction price per sq ft of approximately $225 - $250 with moderate luxury finishes.  Does this sound feasible?