Estimating Foundation Work $500/linear feet

[Abulele Woldulele]

Hi guys,

somewhere I read that a good rule of thumb for changing brick foundation to concrete foundation is $500/linear feet.

Does this mean the perimeter of the building in feet multiplied by $500? In that case, does it mean that foundation work doesn't depend on how tall your building is (number of floors/ stories)? like if there 3 stories, vs 1 floor unit? How do I interpret this estimation technique?

Can you share your estimation technique if you had to roughly gauge changing brick foundation to concrete foundation. A certain margin of error +/-10K is fine.

Much appreciated,

A