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Does home equity grow with the investment put into the house?
If I have a house that its market value went from $100k to $140k can I get HELOC $40K? Maybe - the amount that you can borrow depends on the market value of the house, so if you already have $100k borrowed against it, it will be tough to borrow another $40k without paying a higher interest rate, since there is a real risk that the value will decrease and you will be underwater.   Can I again ask for HELOC after I finish the renovation in order to do more renovation and maybe try to end up renovating the house so its value raises up to $500k? I doubt you can just "renovate" a house and increase its market value from $140k to $500K.  Much of a house's value is determined by its location, and you can quickly outgrow a neighborhood.  If you put $360k in improvements in a neighborhood where other homes are selling for $140k you will not realize nearly that amount in actual market value.  People that buy $500k houses generally want to be in an area where other homes are worth around the same amount.   If you want to to a major renovation (such as an addition) I would instead shop around for a Home Improvement Loan.  The main difference is that you can use the expected value of the house after improvements to determine the loan balance, instead of using the current value. Once the renovations are complete, you roll it and the existing mortgage into a new mortgage, which will likely be cheaper than a mortgage + HELOC. The problem is that the cost of the improvements is generally more than the increase in market value.  It also helps you make a wise decision, versus taking out a $40k HELOC and spending it all on renovations, only to find out that the increase in market value is only $10k and you're now underwater. So in your case, talk to a contractor to plan out what you want to do, which will tell you how much it will cost.  Then talk to a realtor to determine what the market value with those improvements will be, which will tell you how much you can borrow.  It's highly likely that you will need to pay some out-of-pocket to make up the difference, but it depends on what the improvements are and what comparable homes sell for.