When a parent needs to move in, the housing question usually gets framed as a feelings problem — where will everyone be comfortable, who gets which floor, will it feel like an intrusion. Those matter. But underneath them sits a six-figure capital-allocation decision that most families make on gut instinct and regret later.
There are really only two serious paths: build a self-contained unit into the home you already own, or sell and buy something bigger with a suite already in it. This post is the cold-eyed math on both — the build costs, the two federal tax credits that quietly tilt the whole thing, the friction costs of trading up that nobody budgets for, and the optionality one path gives you that the other doesn’t.
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