Commodities like houses maintain their value.

If you sell your house, you have money to buy that same house. Those is true no matter where or when.

If you buy a house for $100,000 and the price goes up to $200,000, you can sell it for $200,000 and buy another equivalent house.

If the price drops to $50,000, you can sell it for $50,000 and turn around and buy another equivalent house.

It's the fiat that loses value, not the house.