Technical feasibility + Economic feasibility + Financial feasibility
The Feasibility Studies phase is key. At this stage you need to analyze all possible options about the profitability of your business or future enlargement, and to do so, you need estimations of reliable costs, reliable programming and also reliable technical analysis
Do not let your business be at risk just for the fact of having started from erroneous or inaccurate data. If your building ends up costing 10% more than expected or delayed 6 months to get it going, it can mean a very considerable effort to get to retrieve the desired normality or it may mean an increase in external financing funds.