All properties managed by PURE Property Management of Tennessee must meet the current code (set in 2006) for smoke and carbon detectors. If your property is older than 10 years old and an electrician has not updated your smoke and carbon detectors, it is likely that an electrician will have to update them. The cost depends on house size and layout. The average cost is about $600 for a 3-bedroom home. Please note, most detectors that meet code cost around $50 each. Therefore, while Lowe’s/Home Depot sell detectors as cheap at $8 each, these detectors do not meet code and thus are not acceptable.