Long story short I have about $70k left to pay on a loan, while I have my home loan sitting on interest only since day 1, 3 years ago.
My home has increased in value about (conservatively) $100k, so I would say I have at least $260k equity in my home loan now.
Would the bank allow me to transfer the $70k debt into my home loan? My father suggested telling them we need $70k for renovations and to set it up as a line of credit, but that's bending the truth a bit.
I'd like to gather as much financial advice as possible before approaching them.
Approach your home loan bank and ask for your loan to be increased. They will do a desktop valuation of your home and ask for payslips etc which if all checks out then they will increase your home loan no problems & no fees.
They will ask you what you are using the new funds for. It doesn't need to be anything exciting, tell them you just want extra buffer in case an opportunity or emergency arises in the future. The reason you give is not going to affect whether they grant the loan increase or not, but saying you will be doing renovations if you aren't is probably not a good idea because they can find something like that out. I would also avoid telling them it's to consolidate another loan.
When the increased home loan settles the bank will deposit the extra cash into your savings (hopefully offset) account. Then contact the $70k loan provider in order to pay it off. I wouldn't try to do it in one step - i.e. get the $70k first, then pay off the $70k.