(817) 447-7141
    Hardwired smoke and carbon monoxide detector installation Dallas Fort Worth
    Back to Blog
    Electrical SafetyJuly 14, 20265 min read

    Hardwired Smoke & CO Detector Installation Cost in DFW (2026)

    Battery-only smoke detectors are the #1 cause of fire fatalities in Texas — they get disabled when they chirp. Hardwired, interconnected detectors with 10-year battery backup solve both problems and are required by code in most DFW installs.

    What Texas & DFW Code Requires

  1. Every bedroom — one smoke detector inside each sleeping room
  2. Every hallway outside sleeping areas
  3. Every level of the home including basements & attics with mechanicals
  4. Interconnection — one detector sounds, all sound (2020 NEC + IRC R314)
  5. CO detector outside sleeping areas if you have any:
  6. Gas furnace, water heater, cooktop, or fireplace
  7. Attached garage
  8. Hardwired w/ battery backup on new construction and major remodels
    9. Hardwired interconnected smoke and CO detector installed in DFW home hallway
    Hardwired interconnected smoke and CO detector installed in DFW home hallway

    Real DFW Install Pricing (2026)

    | Scope | Typical Cost |

    | --- | --- |

    | Single hardwired detector (existing wire) | $95 – $175 |

    | Add hardwired detector to a room (new wire) | $185 – $325 |

    | Full home retrofit (4–6 units, new wiring, interconnect) | $850 – $1,650 |

    | Full home retrofit (2-story, 8–10 units) | $1,650 – $2,800 |

    | Wireless-interconnect retrofit (no new wire) | $85 – $135 per unit installed |

    Hardwired vs. Wireless Interconnect

    Hardwired (traditional):

  9. Required on new construction & major remodels
  10. Runs a 3-wire cable (hot, neutral, interconnect signal) between all units
  11. Most reliable, no batteries in signaling

    12. Wireless interconnect (retrofit-friendly):

  12. First Alert Onelink, Kidde, Nest Protect
  13. Meets IRC R314.5 for retrofits (check your city's amendment)
  14. Works when tearing open walls isn't practical
    15. Wireless interconnect smoke detector — Nest Protect or First Alert Onelink for retrofits
    Wireless interconnect smoke detector — Nest Protect or First Alert Onelink for retrofits

    What Homeowners Get Wrong

  15. Ionization vs Photoelectric — code now prefers photoelectric (or dual-sensor) for fewer false alarms from cooking

    16. 2. 10-year sealed battery backup required in Texas (not user-replaceable 9V)

  16. Combo smoke + CO — one unit at a location, not two. Simpler, one battery
  17. Not testing after install — every unit must be tested to confirm interconnect works

    18. 5. Skipping the attic if you have HVAC equipment or storage there

    Timeline

  18. Single detector swap: 15–20 min
  19. Whole-home retrofit (wireless): half day
  20. Whole-home retrofit (hardwired): 1–2 days depending on access

    21. Get a Fixed Quote

    We spec every location, brand, and interconnect method in writing. Call (817) 447-7141 or [request a smoke detector quote](/get-a-quote).

    Need Electrical Help?

    Spillers Electric serves Burleson, Fort Worth, and the entire DFW metroplex. Licensed Master Electrician — fully bonded & insured.

    (817) 447-7141Get a Free Quote

    Related Services

    Electrical InspectionsEmergency ElectricianPanel Upgrades

    Electrical Inspections Near You

    Spillers Electric serves homes and businesses across the DFW metroplex.

    Electrical Inspections in Fort WorthElectrical Inspections in ArlingtonElectrical Inspections in MansfieldElectrical Inspections in Weatherford

    Related Articles

    Warning signs of electrical problems in home walls and outlets

    7 Warning Signs Your Home Needs Electrical Repair — Don't Ignore These

    Burning smell from electrical outlet warning sign

    Burning Smell From an Outlet or Panel? Do This Immediately