How to Hide Network Cables Inside Walls: A Complete Guide
Visible network cables ruin a clean home aesthetic. Learn how to properly route Ethernet and data cables inside your walls — including the tools, techniques, building code considerations, and when professional help makes sense.
Why Hiding Network Cables Matters
Exposed Ethernet cables running along baseboards, across doorways, and up walls are one of the most common eyesores in modern homes. A single cable taped along a baseboard can undermine the aesthetics of an otherwise well-designed room. Multiple cables running to different devices create a tangled mess that collects dust and creates tripping hazards. Beyond aesthetics, exposed cables are vulnerable to physical damage. Foot traffic, pet chewing, vacuum cleaners, and furniture movement can kink, crush, or sever an Ethernet cable, resulting in intermittent connectivity or complete connection failure. Cables that run under rugs create compression points that degrade the internal wire pairs over time. Hiding network cables inside walls eliminates all of these issues. The cable is protected from physical damage, completely invisible, and routed through the most direct path between two points. The end result is a pair of clean wall plates — one at the device location and one at the network equipment — with nothing visible in between. This is exactly how commercial buildings, hotels, and offices handle their network cabling, and there is no reason your home cannot achieve the same professional result.
Tools and Materials You Need
Running network cables inside walls requires a specific set of tools beyond what most homeowners have in a standard toolbox. A stud finder is essential for locating framing members and avoiding them when cutting openings. An inspection camera — a small camera on a flexible cable connected to a display — lets you see inside wall cavities before and during cable pulls to verify the path is clear. Flexible drill bits, sometimes called installer bits or flex bits, are long flexible shafts that can drill through top plates and fire blocks inside enclosed wall cavities. These bits are typically 54 to 72 inches long and can navigate around obstacles that a standard drill bit cannot reach. A fish tape or fish rod set is used to pull cable through wall cavities. Fish rods are fiberglass rods that link together and push through cavities, while fish tape is a flat metal or fiberglass strip that coils and uncoils. Glow rods — fish rods with luminescent tips — are helpful for finding the end of a rod in a dark wall cavity. For the cable termination, you need a punch-down tool for keystone jacks, a cable stripper, and keystone jacks that match your cable type (Cat5e, Cat6, or Cat6a). Low-voltage old-work brackets — also called mud rings — mount in the drywall and hold the wall plate without requiring attachment to a stud. A drywall saw cuts the openings for these brackets. Finally, cable testing equipment is needed to verify the completed installation. A basic cable tester confirms connectivity and wire mapping, while a certification tester verifies performance specifications like crosstalk and signal quality.
Step-by-Step Cable Routing Through Finished Walls
The general process for routing an Ethernet cable through a finished wall involves several steps. First, plan the route. Identify the starting point (device location) and ending point (network equipment location). Determine whether the cable will run vertically through a single wall, horizontally through a shared wall cavity, or through the attic or basement to reach a different room. Use a stud finder to map the framing and identify a clear path. Second, cut the openings. At each end of the cable run, cut a hole for a low-voltage old-work bracket. These brackets are designed for retrofit installations and clamp onto the drywall without requiring a stud. Position the openings between studs, not over them. Third, create the path. If the cable needs to pass through a top plate (the horizontal framing member at the top of a wall), use a flexible drill bit inserted through one of the openings to drill through the plate into the attic or ceiling cavity. If the cable needs to pass through a bottom plate into a basement or crawl space, the same technique applies from below. Fourth, pull the cable. Attach the Ethernet cable to a fish tape or fish rod and pull it through the wall cavity from one opening to the other. For longer runs that pass through the attic or basement, pull in stages — first from the room opening to the attic or basement access point, then from the access point to the second room opening. Fifth, terminate and test. Strip the cable jacket, punch down the individual wires into keystone jacks following the T568B wiring standard, snap the jacks into wall plates, and install the plates into the old-work brackets. Test every connection with a cable tester before closing up any access holes.
Building Code and Safety Considerations
Hiding network cables inside walls is generally straightforward from a code perspective, but there are important rules to follow. Ethernet cable is classified as low-voltage communications cable and is governed by different code sections than line-voltage electrical wiring. The most critical rule is separation from electrical wiring. Data cables should maintain a minimum distance from power cables when running parallel in the same wall cavity. Crossing power cables at a 90-degree angle is acceptable, but running data and power cables side by side for extended distances can introduce electromagnetic interference that degrades network performance. Use appropriate cable ratings for the installation environment. Standard CMR (riser-rated) cable is suitable for runs through walls and between floors. CMP (plenum-rated) cable is required if the cable passes through an air-handling space like a drop ceiling used as an HVAC return plenum. Fire stopping is required when cables penetrate fire-rated assemblies. In multi-story homes, any cable that passes through a floor or ceiling assembly should have fire-rated sealant applied around the penetration to maintain the fire barrier. This is a code requirement that protects occupants in the event of a fire. One area where homeowners frequently make mistakes is confusing low-voltage cable with power cable routing. You cannot run a standard extension cord or power cable through a wall cavity — this violates electrical code and creates a fire hazard. If you need power at a TV or network equipment location, that power must be supplied by a properly installed electrical outlet or a UL-listed power bridge kit designed for in-wall use.
When to Call a Professional
Some cable routing scenarios are straightforward enough for a capable DIY homeowner, while others genuinely require professional tools and experience. A simple vertical run from a basement directly up into the room above, through a single top plate, is a manageable project if you have the right tools and a clear path. However, several scenarios call for professional installation. Multi-story runs that require navigating through multiple top plates, fire blocks, and insulated cavities are challenging without experience. Exterior walls filled with insulation make cable fishing extremely difficult — the insulation grabs the cable and prevents it from sliding through the cavity. Walls with horizontal fire blocking (short pieces of lumber nailed between studs to slow fire spread) require drilling through these blocks from inside the wall cavity using flexible bits, which is a skill that takes practice to master. Plaster and lath walls, common in older homes, are more difficult to cut cleanly and more challenging to fish cable through than standard drywall. Masonry walls — brick, stone, or concrete block — cannot be fished at all and require surface-mounted conduit or channels cut into the masonry surface. TV Solutions handles all types of wall construction across the service area. Experienced technicians carry the full range of tools for every wall type and can route cables cleanly through the most challenging construction. Book a cable concealment consultation and get a clean, code-compliant installation with zero visible wiring.
Frequently Asked Questions
Is it legal to run Ethernet cable inside walls?
Yes. Ethernet cable is classified as low-voltage communications cable and is permitted inside wall cavities in residential construction. Use CMR-rated cable for standard wall runs and CMP-rated cable if the run passes through an air-handling plenum space.
Can I run Ethernet cable next to electrical wiring?
You should avoid running Ethernet parallel to electrical cables for extended distances in the same cavity, as this can cause electromagnetic interference. Crossing power cables at a 90-degree angle is acceptable. Maintaining at least 12 inches of separation for parallel runs is the standard practice.
How do I get cable from the first floor to the second floor?
The most common method is routing through an interior wall that continues from the first floor to the second floor, drilling through the top plate of the first-floor wall into the floor cavity or directly into the second-floor wall cavity. Alternatively, routing through an attic or closet chase provides a clear path between floors.
What if my walls are plaster instead of drywall?
Plaster walls are more challenging to cut and fish through than drywall. The plaster can crack if cut improperly, and the lath behind it complicates cable routing. Professional installation is recommended for plaster walls to avoid cosmetic damage and ensure clean openings.
Can I hide cables without cutting into walls at all?
Yes. Surface-mounted raceways — paintable plastic channels that attach to the wall surface — conceal cables without any wall penetration. They are renter-friendly and can be painted to match your wall color. The result is not as invisible as in-wall routing, but it is far cleaner than exposed cables.
How long does it take to route cable through a finished wall?
A single cable run through a finished wall typically takes 1 to 2 hours depending on the route complexity. Multi-room installations in finished homes can take a full day. The majority of time is spent planning the route and fishing cable rather than the actual termination.