1 BR Septic Permit on 3 BR House - how do I fix this?

[Kelly Rastatter]

I have a deal I am trying to do my due diligence on. The septic was permitted for a 1 bedroom tank and the house is a 3/2. The wholesaler notes the septic tank is too small and needs to be replaced with a bigger one but hasn't done any investigating past that note.

I think I need to find out if the permit matches what was actually installed and if not, can I get it permitted correctly? Don't know how to do this.

If really too small, don't they have to perk test to see if a larger one can even be installed?

Wouldn't the leechfield have to be replaced to accommodate a bigger tank too?

What else am I missing?

What are my steps to get an estimate of what this cost would be and if it can even be done? I don't want to end up with a property I can't actually fix and sell.

Experienced input is very much appreciated!