913,568
Varies by state and county. Some places also require sprinkler systems these days.
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Bob "RealMan" Timm
Minot, ND
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Peter Mohylsky, Beach ...
Miramar Beach, FL
1,513,143
I know some homes here have an old-style from the "60s
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Bob "RealMan" Timm
Minot, ND
902,038
In state of Connecticut - as of Oct 1, 1978.
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Bob "RealMan" Timm
Minot, ND
5,061,034
Not sure but guessing decades ago here in CA. Carbon monoxide detectors began to be required in mid-2011 as I recall.
7,864,157
766,179
I would guess the start date is different in every community, county, or state.
249,799
3,167,714
1,553,599
2,784,726
Usually contested anything results at some point laws being put into place. I am guessing that insurance companies made it clear they will not insure unless this was done and why wouldn't cities agree? Failure to support shifts liability to the one that says NO. This country is governed by laws/litigation
6,418,799
Smoke alarms have been required for decades here, CO detectors became a requirement about 5 years ago.
3,349,554
1,847,051
2,400,450
The "code" is determined by the community. New construction has been required for at least 20 years in Minot ND. I can not speak to any other community Peter Mohylsky, Beach Expert .