The Complete Smart Home Wiring Guide for New Construction

You are building a house, or doing a major renovation where walls are open. This is your one chance to get the wiring right. After the drywall goes up, adding cables means cutting holes, fishing wires through insulation, and paying someone $200 to run a single Ethernet cable that would have cost $5 during construction.

Too many people build a new home, think "everything is wireless now," and then spend years fighting WiFi dead zones, running extension cords to camera locations, and wishing they had one more Ethernet drop. The marginal cost of wiring during construction is almost nothing. The marginal cost of adding it later is enormous.

Here is everything you should wire before those walls close up.

Ethernet: Run More Than You Think

This is the most important section. Ethernet is the backbone of a reliable smart home. WiFi is great for phones and laptops, but everything that does not move should be wired.

Minimum Ethernet runs:

• Every room: at least 2 drops. One for a device (smart TV, gaming console, work computer), one for a wireless access point or future use. Run them to different walls if possible.
• Living room: 4 drops. TV wall gets two (TV and streaming box/game console). Two more on adjacent walls for flexibility.
• Home office: 4 drops. Desktop, monitor with Ethernet, docking station, and a spare.
• Kitchen: 2 drops. One near where a tablet or smart display will go, one spare.
• Garage: 2 drops. One for a camera, one for a workbench computer or access point.
• Exterior locations: 1 drop each. Front door, back door, driveway, and any other camera location. These should be PoE-ready for IP cameras. Run them to the soffit or eave where cameras mount cleanly.
• Ceiling locations for access points: 1 per floor. Central ceiling location on each floor for a WiFi access point. This is the single highest-impact placement for whole-home WiFi coverage.
• Utility areas: 1-2 drops. Near the smart home hub, near the network rack, near the electrical panel if you plan a smart energy monitor.

Cable specification: Run Cat6A minimum. Not Cat5e, not Cat6. Cat6A supports 10 Gigabit Ethernet at up to 100 meters and is shielded against crosstalk. The cable itself costs maybe $0.30/foot versus $0.15/foot for Cat6. Over a whole house, the difference is $100-200. That buys you a decade of headroom.

The Network Closet

All those Ethernet runs need to terminate somewhere. Designate a closet, utility room, or dedicated space as your network center. This is where your router, switch, patch panel, and smart home hub will live.

Network closet requirements:

• Dedicated 20A electrical circuit. Your network equipment, server, and UPS will draw consistent power. A dedicated circuit means no shared load with vacuum cleaners or space heaters that could trip a breaker.
• Ventilation or a small fan. Network equipment generates heat. A closed closet with a router, switch, server, and UPS can get uncomfortably warm. A simple vent to the room or a quiet exhaust fan keeps temperatures manageable.
• Plywood backboard. Mount a sheet of plywood on one wall for attaching patch panels, equipment shelves, and cable management. Much easier than trying to mount everything on drywall.
• At least 4 electrical outlets. You will use more than you expect, router, switch, UPS, server, ISP modem, power strip for miscellaneous devices.

Conduit: The Insurance Policy

Conduit is empty pipe that you install in walls during construction. It lets you pull new cables through later without opening walls. You cannot predict every future need, but conduit gives you a path to adapt.

Where to install conduit:

• Network closet to attic. This is the most valuable conduit run. From the attic, you can access nearly any exterior wall or ceiling location for future cable runs.
• Network closet to garage. For future camera runs, EV charger smart monitoring, or garage automation equipment.
• Between floors. If you have a multi-story home, a conduit from the first floor ceiling to the second floor is invaluable for running cables between levels.
• To the TV wall. Behind the TV is where cables accumulate over time. HDMI, Ethernet, speaker wire, power, a conduit lets you add whatever the next TV standard requires.
• Exterior wall penetrations. Pre-install weatherproof conduit entry points where you might mount cameras, sensors, or outdoor speakers.

Use 1-inch (25mm) smurf tube or orange ENT (Electrical Non-metallic Tubing) for low-voltage conduit. It is flexible, cheap, and easy for electricians to install during rough-in. Pull a string through each conduit during installation, this makes it trivial to pull cables through later.

Electrical Outlet Placement

Smart homes need more outlets than traditional homes, and in different locations:

• Inside closets and cabinets. Smart hubs, wireless access points, and other devices often live inside closets or on shelves. An outlet inside a coat closet, linen closet, or upper kitchen cabinet saves you from running extension cords.
• High on walls for cameras and access points. Install outlets at ceiling height (or in the ceiling) where you plan to mount cameras or WiFi access points. These should be on dedicated circuits or at least behind-the-device locations where they are invisible.
• Behind the toilet. If you ever want a bidet seat (which are increasingly popular and many are electrically powered), you need an outlet here. Almost impossible to add after the fact without visible conduit.
• Garage ceiling. For a future garage door opener upgrade, camera, or occupancy sensor. Most garages have zero ceiling outlets.
• Exterior outlets on every wall of the house. Holiday lighting, cameras, outdoor speakers, smart irrigation controllers, exterior outlets are always in demand. Install GFCI-protected outlets on all four sides of the house.
• Kitchen island. If your island has a countertop, pop-up outlets are clean and useful. Even if you do not wire them now, install the conduit so you can add outlets later without tearing up the floor.

Low-Voltage Wiring Beyond Ethernet

A few other low-voltage runs to consider:

• Speaker wire: If you want in-ceiling or in-wall speakers for multi-room audio, run 16-gauge speaker wire during construction. Pre-wire for at least the living room, kitchen, master bedroom, and outdoor patio. Even if you do not install speakers immediately, having the wire in the wall is 90% of the work.
• Doorbell wire: If you plan a video doorbell, make sure the existing doorbell wiring supports at least 16V 30VA. Many older transformers are underpowered for video doorbells. Upgrading during construction is trivial.
• HDMI conduit: Do not run HDMI cable in walls, the standard changes too often. Run conduit instead, so you can pull whatever the current HDMI standard is when you actually install the TV.
• Motorized shade wiring: If you are considering smart blinds or motorized shades, install a power outlet or low-voltage wire at the top of every window you might want to automate. This is nearly impossible to retrofit cleanly.

The Wiring Checklist

Hand this list to your builder or low-voltage contractor:

1. Cat6A Ethernet to every room (minimum 2 drops per room, 4 for living room and office)
2. Cat6A to ceiling center on each floor for WiFi access points
3. Cat6A to all exterior camera locations (PoE-ready)
4. 1-inch conduit from network closet to attic, garage, and between floors
5. Conduit behind TV wall location
6. Dedicated 20A circuit for network closet
7. Plywood backboard in network closet
8. Outlets inside closets where smart home equipment will live
9. High outlets for cameras and access points
10. Outlet behind toilet for bidet
11. Exterior GFCI outlets on all sides of house
12. Speaker wire to rooms where you want ceiling speakers
13. Neutral wire confirmed in every switch box
14. Deep switch boxes (2.5 inch minimum)
15. Power or conduit at top of windows for motorized shades
16. 24-port patch panel in network closet with all runs labeled