Low Voltage Wiring in Houston Homes: What Is in Your Walls and What to Do About It

A century of Houston homes and the wire each era left behind

Find your house in the table. The right-hand column is the one that decides how much a rewire costs.

Keep it, pull with it, or leave it: judging wire already in the walls

Two facts settle most of it. First, the print on the jacket: CAT3, CAT5, CAT5e, RG59, RG6, 22-4. Second, the layout: does each jack run back to one central spot, or does the cable hop from jack to jack around the house?

• Four-conductor phone wire (red, green, black and yellow, not twisted) and Cat3: not suitable for modern Ethernet. Leave it for a landline, or, if it slides loosely in the wall, use it to pull new cable through.
• Cat5 without the e: sometimes runs gigabit over short distances. Test it; keep it if it passes; do not expect multi-gigabit.
• Cat5e home runs: generally fine for gigabit to a desk or television. A ceiling access point with a multi-gigabit port may deserve a new Cat6 or Cat6A drop.
• RG59 coax: adequate for older analog cameras, weak for satellite and for networking over coax.
• RG6 home runs: a candidate for MoCA, which carries Ethernet over the coax you already have. It needs MoCA adapters, splitters rated for MoCA frequencies and a filter where the provider’s line enters, but it can avoid opening a single wall.
• Old alarm cable (22-gauge, two or four conductors): sometimes reusable for new sensors, once the device’s current draw is checked against the gauge.

When wiring that used to work stops working

Start from the symptom, then narrow down.

One jack is completely dead

Check the patch cord, then the termination at the jack and at the panel. If both look right, a tone generator and probe will locate the break. In Houston the usual culprits are a nail from a picture hanger, a staple, or roof rats chewing through a jacket in the attic.

The connection shows 100 Mbps instead of 1 Gbps

Gigabit Ethernet uses all four pairs; 100 Mbps needs only two. One broken or mis-terminated conductor on the other pairs quietly drops the link to the slower speed with no error message. A tester that shows the wire map finds it in minutes.

Drops come and go on hot afternoons

Before blaming the cable, check the equipment. A switch or router shut in a warm garage closet overheats far more often than cable fails. Loose terminations that open and close with temperature are the next suspect.

The house flooded and was repaired

After Harvey and the floods of 2015 and 2016, thousands of Houston homes had drywall cut at two or four feet. Low-voltage runs severed at that line were sometimes spliced with tape or crimp connectors inside the wall and closed up. Those hidden splices degrade over time, and a run that tests intermittent or slow is often broken at exactly that height. Cable that sat in floodwater should be replaced, not dried out, because water wicks along inside the jacket.

Television or internet over coax is unreliable

Too many splitters, leftover RG59 or a corroded connector outside are the common causes. Gulf Coast humidity corrodes unprotected outdoor connectors, so they get weather boots.

How the route for new wire changes from house to house

• Pier-and-beam. The crawlspace gives access from below, but cable is fastened up in the joists, never left lying on the soil where moisture and animals find it.
• Balloon framing. Open stud bays run from the crawlspace to the attic, which makes vertical fishing simple. Any fire blocking disturbed along the way is restored.
• Shiplap and plaster. Shiplap gives old-work brackets a solid grip but snags fish tapes on its nails. Plaster is cut with an oscillating tool so the opening stays clean rather than cracking outward.
• Raised homes. Houses in Meyerland and along Brays Bayou that were elevated after flooding now have usable space underneath, which reopens the from-below route.
• Concrete towers. There is nothing to fish through. Wire travels in soffits, above ceilings or in painted surface raceway, and any coring requires association approval and slab scanning.

Deed restrictions, condo boards and the villages

Houston has no zoning code, but many neighborhoods carry deed restrictions enforced by civic clubs, and those mostly concern appearance. Visible conduit, an exterior box or a dish on the front elevation may need a look before it goes up. Condominium associations add alteration agreements, insurance certificates, work-hour limits and elevator reservations. In a townhome row, the wall shared with the neighbor is a fire-rated assembly, and we do not penetrate it.

Bellaire, West University Place and the Memorial villages sit inside Houston’s footprint but are separate cities with their own rules, so we confirm requirements for the specific address before scheduling.

Narrower guides for parts of Houston

This page covers the whole city. For more depth on one area, the ZIP guides go further. The low-voltage wiring guide for Houston 77043 covers the west Spring Branch area around Campbell, Blalock and Long Point, including home-run cabinets, the cable-type table and separation from power in detail. For a business space rather than a home, see commercial low-voltage cabling in Houston.

Scheduling depends on where you are. The Energy Corridor, Memorial and Spring Branch are close to our Katy base; the inner loop and Clear Lake are longer drives, so we favor early windows there and plan around I-10 and 610 traffic. In July and August, attic work goes on the morning schedule, before the space under the roof heats up.

What happens when EVOTECH comes to look at your wiring

1. We start with what is not working and what you want the house to do.
2. We inventory what is there, at the panel, the closet and the jacks.
3. Each existing run is tested for wire map and length.
4. You get a map showing which runs are worth keeping.
5. We propose the mix: reuse, MoCA over coax, new pulls, or repairs.
6. An itemized quote follows; line-voltage items are named for a licensed electrician.
7. After the work, every run is retested and labeled at both ends.

Why one Houston house costs more to wire than another

• Construction type: crawlspace access versus a two-story slab versus concrete.
• How much existing wire tests good enough to keep.
• Jacks on outside walls, where low roof pitch closes off the attic.
• Plaster, shiplap or masonry instead of plain drywall.
• Attic height, insulation depth and heat.
• Association paperwork and working-hour limits.
• Flood-damaged runs that must be replaced end to end.

Request a low-voltage wiring quote for your Houston home

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