Whether interest rates will go up in the next year is anyone’s guess. My suspicion is that rates could rise, and then dip if we have a severe recession.
Currently, the rate on a 30-year fixed rate mortgage is about 7.3% for someone with good credit — so not exactly the best time to buy. If the purchase is not urgent, I suggest he continue to accumulate cash for a larger down payment (in a safe money market account) and wait for rates to drop — and that may take more than a year.
But if he finds a bargain, or the “perfect house” right now, it’s important to remember that if/when rates drop he can always refinance. But he can use the present housing sales slowdown (occurring because of high rates) to negotiate for a better price on the house, creating that bargain, if the seller is desperate.