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For a small (65-seat) one-screen we are putting in single- toilet bathrooms. No stalls, just a lockable door with assist rails on the wall. I have these sketched
off at 5 ft. wide by 8 ft. deep.
Will this conform to acceptable ADA requirements?

Your buiding department will have the answer for you. But if you can fit a 48 inch circle in to the bathroom with all the fixtures in place, that should do it.

Simfilms

ADA requires a 60 inch circle, not 48 inches. This must be free of all plumbing fixtures, and the door must open outwards. There are some other clearance requirements, but it should be possible to satisfy ADA in the space you have. Another option could bhe to make both washrooms unisex, and have only one of them ADA accessible. This way, you could enlarge one to meet the requirements and reduce the size of the other one.

Also watch the location of hand rails by the water closet. Make sure their size and location conforms to local codes. The side distance the water closet is placed from the wall is also critical. In our area the side dimension from the centerline of the stool to the finish sidewall is 18". Some building officials will allow the clearance circle in the restroom to extend under the lavatory a little providing that the lavatory is a wall mount with no cabinet below. Your entry door to the bathroom should be a 36" wide unit. Best thing is to check with your local code official and see if they have a handout containing the specifications. Another item to be aware of is any open plumbing (ie water and waste lines under the lavatory must have a padded protective cover. These are usually available at a Lowes or Builders Square type store. Some municipalities will also accept less than perfect standards when retrofitiing an ADA restroom in an existing structure. Accesibility does not have to be a complicated or expensive proposition. Most problems arise when someone has not done their homework prior to construction and the work has to redone.

Ck with your local city development department. Some cities have requirments beyond ADA (as hard as that might be to believe). These are things best not discovered after the paint has dried on your new walls.