I don't look at the housing market like that - causes and effects are not obvious.
Firstly, people can afford to pay $x for mortgage interest. The "cost" of borrowing remains constant because incomes don't change. As mortgage interest rates decrease, $x doesn't change. Instead people can borrow more (for the same amount spent on interest) and they bid more. So house prices go up.
Firstly, people can afford to pay $x for mortgage interest. The "cost" of borrowing remains constant because incomes don't change. As mortgage interest rates decrease, $x doesn't change. Instead people can borrow more (for the same amount spent on interest) and they bid more. So house prices go up.