How to Run Ethernet Cable Through Your House, Step by Step

To run Ethernet cable through a house, plan a route from the router to each room and drill through the wall’s top or bottom plate. Then pull it through the cavity with fish tape and finish both ends in wall jacks. Access from a basement or attic and the wall material decide how hard the job gets. Below are tools, routes by home type, eight steps, and NYC installer prices.

Tools and Cable You Need

A wired run gives every connected room steadier speed than Wi-Fi, but only if the cable and tools suit a permanent in-wall job. The basic kit for a first run:

• Stud finder with wire detection and a non-contact voltage tester
• Drill with a long spade or auger bit, plus a flexible drill bit for closed walls
• Fish tape or glow rods to guide the cable through the cavity
• Drywall saw, low-voltage mounting brackets, keystone jacks, and wall plates
• Punch-down tool, cable stripper, and a basic cable tester

For the cable itself, Cat6 is the practical choice for most homes: it carries gigabit speed over the full run and 10 gigabits over shorter distances. Buy solid copper cable with a CMR (riser) rating for in-wall runs. Plenum-rated CMP cable is only needed in spaces that move air, such as some ceiling returns. Copper-clad aluminum cable should be avoided, because it runs hot and fails under Power over Ethernet. Our explainer on what an Ethernet cable is compares the categories in more detail.

Plan the Route for Your Type of Home

The route determines most of the effort, so sketch it before purchasing cable. Mark the router or network closet, every room that needs a jack, and the path between them. Add 10% to 15% to the measured length for turns and slack.

Houses with a Basement or Attic

Open framing above or below the rooms makes this the simplest configuration. Cable runs across the attic floor or the basement ceiling, then drops into each wall cavity through a hole in the top or bottom plate. Most first-floor jacks can be supplied from the basement within an afternoon.

Brownstones and Prewar Walls

Brownstones and prewar homes are harder because of plaster over wood lath, brick party walls, and fire blocking between floors. Plaster cracks when it is cut like drywall, so score the outline first and drill with a sharp bit at low speed. Stacked closets often make the cleanest path between floors, and many brownstones still have an open basement ceiling for the ground-floor runs.

Apartments and Co-ops

In an apartment, walls shared with neighbors and floors between units are usually off limits for drilling. Many co-ops and condos require board or management approval before anyone opens a wall. Renters often skip drilling altogether and run flat cable in a slim raceway along the baseboard and door trim. Where even that is not possible, MoCA adapters send network traffic over existing coaxial TV cable at close to wired speeds. Powerline adapters use the electrical wiring instead and are slower and less predictable in older buildings.

How to Run Ethernet Cable Through Walls: 8 Steps

Follow these steps in order for every run, and test each connection before closing any opening.

1. Mark each jack location 12 to 18 inches above the floor, in line with nearby outlets, and mark the source end near the router or patch panel.
2. Turn off the circuit at the breaker and confirm with a voltage tester that no live wire sits near your marks.
3. Cut the opening for the mounting bracket, then drill through the top or bottom plate near its center, at least 1¼ inches from the face. If the hole ends up closer, cover it with a steel nail plate.
4. Tape the cable to the fish tape with a smooth, folded nose so it does not snag on insulation or blocking.
5. Pull the cable through and leave about 12 inches of slack at each end, with a gentle loop at bends instead of a tight pull.
6. Punch the wires into a keystone jack using the T568B color order, then snap the jack into the wall plate.
7. Terminate the source end the same way, into a patch panel or a keystone, using T568B on both ends of every run.
8. Label both ends with the room name and check the run with a cable tester before you patch it in.

Keep network cable at least 6 inches away from electrical cable where the two run side by side, and cross power lines at a right angle. Seal every hole through a floor or top plate with fire-rated caulk so the fire blocking still works.

Test, Label, and Leave Room to Grow

Test every run before the wall plate goes on, because a miswired pair is easy to fix with the cable exposed and painful to fix later. A basic tester confirms that all eight wires connect in the right order. Professional certification testers also measure whether the run can carry its rated speed.

While the walls are open, run two cables to each desk and TV wall, and leave a pull string in the cavity for the next cable. Material is a small share of the job, so spare cable costs far less than a second trip. If you plan security cameras, one network cable can carry both power and video to each camera. Our guide to security camera installation cost covers that setup. Some owners also pull fiber optic cabling alongside the copper to a home office or equipment closet for later upgrades.

When to Hire an Installer and What It Costs in NYC

A single run between two rooms on an accessible floor is a reasonable weekend project. Hire an installer when the job crosses several floors without an open basement or attic, or when the walls are brick or concrete. Buildings older than 1980 are another reason, since they may contain lead paint or asbestos. The same applies when a co-op needs insured contractors on an approved plan, or when you want six or more jacks feeding a patch panel.

Installers price the work per drop, meaning one cable from the network closet to one wall jack. National pricing usually runs $100 to $250 per drop in easy conditions. A single drop into a finished wall often costs $200 to $400 or more, because the minimum visit charge dominates. First-time wiring for a whole home typically lands between $1,500 and $4,500, and plaster or drywall patching is often extra. New York City jobs tend toward the upper end, since plaster, brick, and building rules add labor.

A whole-home job with a patch panel and labeled jacks falls under structured cabling. Lock and Tech USA’s licensed technicians run and test home and office network cable across the five boroughs; see our Ethernet cabling service.