Offer your thoughts or opinion on the input financial query or topic using your financial background.

Does home equity grow with the investment put into the house?
The bank I work with would be more inclined to expand an existing HELOC rather than write a new one. I think that would be your best bet if you decide to continue borrowing against your home. Consider that your own income would have to support the repayment of these larger homes. If it is, why didn't you buy a larger home to begin with? As far as increasing the appraisal, you don't usually get one dollar of increased appraisal for each dollar you spend on improvements unless you have a rundown house in a nice neighborhood; part of the appraisal comes from a comparison with the appraisals of the other homes nearby. Eventually you get close enough to par with the other houses that anyone looking for something more expensive will often choose a different neighborhood entirely. Update: To your edit that mentions the original lender will cap the amount you can borrow, you can take additional secondary mortgages/HELOCs, but the interest rate is usually higher because it is not the first mortgage. I don't generally recommend it, but the option is there.