Ann Arbor Basement Finishing: Basement Remodeling, In-Law Suites, Bathrooms & Egress Windows

A full finish starts at bare concrete. Rigid foam goes on the foundation walls first. Michigan's code asks for R-10 continuous or R-13 in the cavity on basement walls in Washtenaw County, which sits in climate zone 5A. Framing stands in front of the foam on a pressure-treated bottom plate, with fireblocking at the ceiling line and every 10 feet. Then the rough-ins (circuits, supply and return ducts, any plumbing), inspections, half-inch drywall over the foam, the ceiling, flooring and trim.

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Plenty of Ann Arbor basements were finished once already, decades ago. You know the look: wood paneling on furring strips, a drop ceiling, carpet glued to the slab. A remodel strips that out, and what's behind it decides the plan. Look for a damp stain on the block, mold on the back of the paneling, or a plastic sheet trapping moisture against the wall. Michigan doesn't make you add an egress window when you remodel an existing basement unless you create a bedroom. Any remodel that needs a permit does mean smoke alarms placed as a new house would have them, one of them on the basement level.

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An in-law suite puts a bedroom, a bathroom and a kitchenette on the lower level, so a parent or a grown kid can live downstairs on their own terms. It's the biggest basement project on this list. You need an egress window for the bedroom, a drain plan for both the bath and the sink, a separate circuit for the cooktop and fridge, and a way to keep the space warm without overheating the main floor. If the plan is to rent it out, Ann Arbor's rental code and licensing come into it as well (see the rental section below), and the city's quick-review lane for basement permits excludes accessory dwelling units.

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A basement bathroom is mostly a drainage question. If the sewer line leaves the house below the slab, the contractor can cut a trench in the concrete and run the drains by gravity. If it leaves higher up the wall, the toilet and shower drain to a sealed ejector pit that pumps the waste up to the line. An upflush (macerating) toilet suits a half-bath where cutting the slab isn't worth it. Plan for an exhaust fan vented outside, and a ceiling at least 6 feet 8 inches high, the code minimum for bathrooms.

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At its simplest, a wet bar is a counter, a small sink and a beverage fridge. A kitchenette adds a cooktop or a range and a full-size fridge, which turns it into an electrical job: dedicated circuits for the counter and the appliances, sized for an electric range if there is one. The sink drain follows the same rules as a bathroom. It ties into a gravity line if one is low enough, otherwise it goes to a small pump. Quartz and butcher block are the usual counters downstairs, and closed lower cabinets hide the plumbing access.

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A bedroom is the one basement room the code treats as a life-safety issue. Every sleeping room needs its own emergency escape opening: at least 5.7 square feet clear (5.0 at or below grade), 20 inches wide and 24 inches high, with the sill no more than 44 inches off the floor. Outside, the well needs 9 square feet and 36 inches of reach from the wall, plus a fixed ladder once it's deeper than 44 inches. The room also needs the 7-foot ceiling every finished basement room needs.

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A basement suits a theater: there's little daylight to fight, and the earth and concrete around it keep sound in. The work is in keeping the noise from the floor above: mineral wool in the joist bays, resilient channel under the drywall ceiling, and a solid-core door. Run the speaker and HDMI wire inside the walls before the drywall goes up. A dark painted ceiling, either drywall or open joists painted black, keeps the screen from washing out.

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A home gym needs height more than anything. Measure for overhead presses and a pull-up bar before choosing a drywall ceiling, because a drop ceiling or a soffit around a duct can eat the clearance. Rubber tiles go straight onto the slab and take dropped weights. Put in a dehumidifier and a fan: a workout adds moisture to a space that tends to run damp. Plan a dedicated circuit if a treadmill is going in.

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A basement office works when it doesn't feel like a basement: recessed lights, a light ceiling and wall color, and a desk set where the window light falls across the work rather than into the screen. Pull an Ethernet line from the router while the walls are open, and put the office on the side away from the furnace. If the room might be a bedroom someday, size the window as an egress opening now. Cutting the concrete later is a second job.

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For a lot of families the first finished room is the open one: a sectional, a TV wall, a pool table, a corner for the kids' toys. The usual design problem is the steel posts and the main beam. Wrapping the posts in painted trim and boxing the beam into a soffit makes them look planned. Carpet tile and vinyl plank both handle a slab well, and carpet tile can be replaced a few squares at a time if the floor ever gets wet. Built-in storage under the stairs keeps the room clear.

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