OfflineSmoke Alarms have been required per the International Residential Code since the 1970's, however, Carbon Monoxide (CO) Alarms have only been indroduced as a requirement since 2006 and are manditory as of the 2009 edition of the IRC. Local Building Codes and/or the local Building Offical's mandates can supersede the IRC. So make sure if your doing extensive rehabbing or adding onto an existing structure, that you follow the appropriate guidlines for insuring your investment property is safe for renters or for re-sale.
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Thanks for the tip. It is always a good idea to keep everyone safe and a few dollars on these types of items can go a long way. Ensure you advise the tenant in the lease to frequently check batteries and that they are responsible to verify the workign condition ofthese types of items. It is a safe practice for everyone and a good routine to have. Believe and Achieve!
- Joe