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Should I fund a move by borrowing or selling other property assets?
that would deprive me of the rental income from the property. Yes, but you'd gain by not paying the interest on your other mortgage.  So your net loss (or gain) is the rental income minus the interest you're paying on your home.  From a cash flow perspective, you'd gain the difference between the rental income and your total payment. Any excess proceeds from selling the flat and paying off the mortgage could be saved and use later to buy another rental for "retirement income".  Or just invest in a retirement account and leave it alone.  Selling the flat also gets rid of any extra time spent managing the property. If you keep the flat, you'll need a mortgage of 105K to 150K plus closing costs depending on the cost of the house you buy, so your mortgage payment will increase by 25%-100%. My fist choice would be to sell the flat and buy your new house debt-free (or with a very small mortgage).  You're only making 6% on it, and your mortgage payment is going to be higher since you'll need to borrow about 160k if you want to keep the flat and buy a $450K house, so you're no longer cash-flow neutral. Then start saving like mad for a different rental property, or in non-real estate retirement investments.