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I remain unhealthily obsessed with designing houses. How large do you think a bedroom should be? (Reminder: 1 ft ≈ 0.305 m and 10 ft2 ≈ 0.93 m2.)
Under the IPMC, which is binding in many US jurisdictions, the minimum is 70 ft2 for one person or 50 ft2 per person for two or more people. But no actual rationale is given for these numbers.
The Architectural Graphic Standards for Residential Construction suggest an 8 ft × 2 ft closet "for adults". Obviously, that can be replaced with two 4 ft × 2 ft wardrobes or shelving units. But is that intended to be for a single person or a couple? It isn't clear from the text.
Let's imagine that the typical person wants his own desk, wardrobe, and shelving unit. Each of those items is 4 ft × 2 ft, to which we will add a 4-ft aisle in front. (The AGSRC minimum for the chair in front of the desk is 3 ft, but we want to accommodate a 3-ft door to the bathroom, plus 0.5 ft on each side of the door.) We can arrange these furniture items on opposite sides of the 4-ft aisle, for a total room width of 8 ft. Then, at the end of our 4-ft aisle and perpendicular to it, we add a 7 ft × 3.5 ft twin XL bed
or a 7 ft × 5 ft queen bed, with up to three bunks, plus another 4 ft of circulation space in front of the bed. (The IBC minimum for an aisle is 2.5 ft, but we want to accommodate a 3-ft door to the corridor or the dining/living room, plus 0.5 ft on each side of the door.) Voila—we have a bedroom of 8 ft × 13.5/19.5/25.5 ft (108/156/204 ft2)with a twin XL bed or 8 ft × 15/21/27 ft (120/168/216 ft2) with a queen bed. (I'm assuming that a shelving unit can be split in half to fix the unevenness of the furniture in a one-person or three-person bedroom.) This can be paired with an 8 ft × 10 ft bathroom to form a suite.That's a bigass bathroom. My usual sizing for a master bathroom is 6x10 ft or 180x300cm: 80cm for a full-sized bath, 80cm for a toilet, 140cm for a double vanity.
How can you fit a queen bed into 8 feet? That leaves just 1.5 feet at either side of it. Are you designing it for crab people that will edge sidewise into bed?
A while ago I figured out that the smallest permissible "type B" bathroom under ICC A117.1 seemed to be 5 ft × 10 ft. Here, I just rotated that design by 90 degrees and expanded the 5 ft to 8 ft. I agree that those dimensions are a bit large, but I don't think that a smaller design is possible within the "type B" accessibility constraints.
Whoops, I forgot that a queen bed is supposed to be accessible on two sides rather than just on one side. Ignore that and use the twin XL dimensions, then.
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