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A bedroom with one window, ceiling, flooring, heating and cooling, insulation, plus furniture: $10,000 to $15,000.Structural changes like adding windows, insulation, drywall, a ceiling, and flooring make up the bulk of the costs here (in addition to labor), but if you want to make a full-on apartment with a bathroom and a kitchen, expect to spend significantly more. According to HomeAdvisor, costs range from $6,000 to $21,000, with the national average for this type of project falling around $13,075. Transforming a garage or shed into a guest suite can be a budget-friendly option. Keep in mind that this is just the timeframe for construction - design, permitting, and bidding for contractors adds at six to 10 months. New construction is best left to the pros, so labor will be at least half a third of the final cost, but can be as much as 60 percent.Ĭonstruction of a guest house can take anywhere from four months to a year, with weather and site conditions being crucial to how quickly building can happen. Location is the biggest factor when it comes to price-the more expensive a place is to live, the more it’s going to cost to build-with quality of materials coming in second. Most experts would recommend building a guest house that’s the largest allowable square footage for an ADU (accessory dwelling unit), or at least 500-square-feet, to get the most bang for your buck. A 150-square-foot single-room cabin with just sleeping quarters could be as little as $15,000, but building a structure that small will rarely give you a good return on investment.
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The national average to build an on-site home is $100 to $200 per square foot, according to HomeAdvisor, so the cost for a 600-square-foot one-bedroom guest apartment would start at $60,000. On a cost per square foot basis, building a small guest house is no cheaper than building an entirely new house.
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Building a guest house from scratch is the most customizable option, but it’s going to be the most expensive and time-consuming as well.