In some regions, you could pay up to $400,000 for an average single-story detached ADU. The average cost to build a guest house or an ADU on your property is about $82,500, but typically ranges from $40,000 to $125,000 or more depending on your design preferences and needs. Garage: With a foundation already in place, you can convert a garage to an in-law suite for $20,000–$60,000.īasement: By tapping into the main home’s plumbing, the cost of a basement remodel for an in-law suite can be as little as $10,000–$30,000.Īttic: An attic conversion is more expensive at $40,000–$100,000 due to the need for reinforced floor joists and a safe stairway. Keep in mind that each type of space will need to be outfitted with drywall, insulation, flooring, HVAC, a water heater, plumbing, gas line or 220 outlet, private entrance, bathroom, and kitchenette to function as a separate dwelling. If you aren’t ready to dig up precious space in the backyard to build an ADU, consider converting existing unused parts of your home into an in-law suite. Extending a second-floor room costs even more than a first-floor room. More than simply converting a room, an extension also involves expanding on the foundation at $75 per yard, excavating around the home’s perimeter at $2,600 on average, installing insulation and wiring, and matching exterior paint or siding. The cost to bump out a room for an in-law suite is $20,600 to $54,800. Installing new walls costs $1,800 per wall on average. Each of these additions costs about $5,000 minimum. This includes the cost to add a bathroom or the cost to build a kitchen, both needed to convert an existing room into a fully functional in-law suite. You can turn an existing, finished room in your home into an in-law suite for about $10,300 to $11,250. Find hiring guides, material costs, expert advice, how-to's and more.
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