How to do a) quick, b) preliminary and c) professional feasibility assessment

I have just spent quite a considerable time on this:
For a quick napkin check see this:
9 numbers budding property developers can't ignore | Kieran Clair -
If it passes the litmus test then go deeper by doing the QwikFeaso
If it passes that, then go deeper using the spreadsheet. If you arrange that coffee then I'll be able to show you!
However it misses something very, very important you need to do before doing a a feaso:
Know your numbers for the area and market. Average dwelling size sold, average dwelling size for sale, average selling price/sqm, average dwelling development size, average developer cost/sqm

 

That's right - there is the mathematical possibility - ie land area x plot ratio = number of units but then there is real life. There might be a huge density bonus on a small plot of land which as @AndrewTDP would then require very very expensive ideas to come to fruition.

 

Pages from the book

 

I'm still a bit confused as to where you would go to determine feasibility, I can see various places will prepare a report for you but still unsure as to how to proceed to determine whether a block should be subdivided and sold, or subdivided and built upon to the best ratio? Wildly varying build prices with bigger builders, don't know that I would be game to go with a smaller non HIA contract.

 

add a minimum 10% to anything in rawlinsons. Any estimator that relies on this prices is kidding themselves.