A couple of things I left out-

The heating of the basement is zoned radiant heating in the concrete floor. This room is one zone, so there will be a thermostat in the room.

There will be a ceiling fan.

The ceiling is open to the floor joists above.

You can use that room for whatever purpose you like. If it doesn't comply with the code in your area, then you can't list it as a bedroom when you go to sell the home.

You say basement, two windows - I believe you may need an egress window. If you want this to be a 'legal' sleeping room, contact your permit department.

The windows may be egress, but there is also an exit door (ADA accessible). Actually, when I got my CO last year, it was listed as a bedroom, even though it was unfinished. I guess they wanted the extra taxes!

There are no ADA requirements for single family houses. Local ordinances would need to spell out any special requirements for the handicapped. I have never seen any.

It is common to require an "emergency escape and rescue opening" for a basement bedroom. That can be through a properly sized and located window or a walk-out door. the required "egress" can be via the stair to the floor above.

I wasn't asking about ADA requirements; I was just using that to emphasize how large my exit door is! No one has answered about the CO and smoke detectors, nor about the AFCI requirements, if any.

Since my builder put AFCI breakers for the other bedrooms (and some other rooms also), and smokes in each bedroom, I guess that is what's required. But why are CO detectors required if there is no source of CO? My builder didn't put any of them in.

Perhaps they are not. Does your house not have any fuel burning appliances?

There is a propane-fired cooktop in the kitchen, which has its own vent. Otherwise, none.

Anything involving combustion inside the house without a dedicated intake and exhaust burns oxygen in the house and has the potential to cause CO with a lack of oxygen. It is also possible for your furnace to cause a CO problem if there are leaks in your heat exchanger.

I personally do not like combustion in the house apart from the furnace/fireplace. If I do a fireplace it will be direct vented and my furnace is direct vented. Range is electric, WH is electric.

No furnace, the boiler (and WH) are electric. If I put in a CO detector, where should it be? I read that it should not be on the ceiling, because CO is heavier than air, but should be down low. Should it be in the BR (where I will be sleeping) or in the kitchen (where the CO, if any, is produced. Will it also detect propane leaks?

Hallway outlet near bedrooms, one per floor is the norm.

According to the 2005 edition of the carbon monoxide guidelines, NFPA 720, published by the National Fire Protection Association, sections 5.1.1.1 and 5.1.1.2, all CO detectors 'shall be centrally located outside of each separate sleeping area in the immediate vicinity of the bedrooms,' and each detector 'shall be located on the wall, ceiling or other location as specified in the installation instructions that accompany the unit.

http://www.homesafe.com/coalert/detect.htm

Carbon monoxide is slightly lighter than air, diffuses quickly and evenly throughout a room and is often carried to the ceiling by warm air from the source so a CO detector is usually located on a ceiling unless the detector is far from the source or it needs to be lower to be able to see a digital readout, etc. It is recommended that they not be placed in dead air spaces like on a ceiling near a wall or in a corner.

It should be near where you sleep so it will wake you rather than in a kitchen where it is likely to produce false alarms.

CO is a product of incomplete combustion so a CO detector will not detect a gas leak.