How to wire a media wall

Helpful video reference. The video above is "Installing Electrics To A Media Wall" from the Electricians Life UK channel, published in February 2023. It follows a UK domestic electrician relocating sockets and running the cabling for a media wall installation, which is a good practical overview of the work involved.

1. Plan positions before anything is cut

Media walls work best when the electrical side is sorted before the joiner frames the wall. Sit down with a sketch: where is the television going, how high will it be mounted, where will the electric fire go if there is one, and what equipment will sit on a shelf or in the alcoves?

Standard media wall socket heights: one double socket at around 300 mm from the floor for a floor-level AV unit, and another double socket at TV-bracket height (typically 900 to 1200 mm from the floor) for the television and any streaming devices. A fused connection unit at the same height handles a built-in electric fire. Add a USB socket or two for phone charging if the wall has a shelf at convenient height.

Data and AV runs (HDMI, co-ax, Cat6) should also be planned now. They need their own conduit, kept away from mains cable by at least 50 mm, or run in a separate channel on a different part of the wall. Mixing them in the same channel risks both interference and a safety hazard if mains insulation fails.

2. Check for hidden cables and pipes

Before cutting any channels or recesses, use a cable and pipe detector on every proposed cutting position. This matters even on what looks like a bare wall: previous owners may have run cables, and gas or water pipes sometimes travel where you would not expect.

Turn off all circuits in that part of the house during the detection sweep, then turn them back on and check again with the detector live to spot any cables the passive scan missed.

3. Chase the recesses for back boxes

In a solid wall (brick or block), back-box recesses are cut with an SDS drill and flat chisel. Mark the recess size on the wall, score the outline with the chisel first to prevent cracking past the intended boundary, then work inward. For double sockets you need a depth of 25 mm minimum (35 mm for USB sockets with electronics in the back).

In a plasterboard stud wall, back boxes are surface-plasterboard boxes fixed by tabs that grip behind the board, or steel boxes that screw to the timber stud. Mark and cut the aperture with a jab saw or oscillating multi-tool. Keep cuts clean and square.

If the wall is going to be clad with new plasterboard or panelling, you can surface-run the cable on the existing wall and set the back boxes so they sit at the correct depth once the new cladding is in place. This is often easier than cutting channels, and eliminates the plastering stage.

4. Run cable from the supply

Work out where the new sockets will be supplied from. Options are: a new radial circuit from the consumer unit, extending the existing ring main by adding a spur, or (if the ring is already near the room) running a length of ring to incorporate the new sockets.

A new circuit requires a competent person or Part P notification. Spurs on an existing ring can sometimes be done without notification if the ring is on the same floor and the circuit already covers that room, but check the specific rules before proceeding and do not connect at the consumer unit unless you are qualified to do so.

Pull the 2.5 mm twin and earth cable from the supply point to each socket position. Route in safe zones (see the guide on chasing walls) or in oval conduit. Keep the cable run as short and direct as practical. Do not leave joints in inaccessible positions: all joints must be in accessible, maintenance-free enclosures such as Wago boxes in a junction box, or in the back boxes themselves.

5. Fit back boxes and test before the wall closes

Fix the back boxes into the recesses. In solid walls, use appropriate fixings for the wall type (frame fixings for hollow blockwork, plugs and screws for solid brick). Earth the metal back box if it is metal, via a short earth tail to the earth terminal in the socket.

Connect the conductors: brown to L, blue to N, green and yellow to E. Tighten each terminal firmly. Fit the socket faceplates loosely and restore power. Use a socket tester on every outlet before the wall is closed. A single wiring fault is very much easier to fix now than after the whole wall is clad and plastered.

If a socket tester shows a fault (reverse polarity, missing earth, open circuit), diagnose and fix before proceeding. Do not assume a fault will sort itself out under load.

6. Second fix: fit faceplates once the wall is finished

Once the joiner has finished boarding, the plasterer has skimmed if required, and decoration is complete, do the second fix: fit the socket faceplates, tighten the two screws evenly so the plate sits flush, and do a final socket test. Fold cables carefully into the back box without trapping the insulation under the plate edge.

If you fitted conduit for HDMI or data cables, pull through and terminate those now as well. Label anything that is not obvious behind the finished wall.

When to call us

Richard covers media wall electrical work as part of renovation and part-rewire jobs across Sandwich and east Kent. Whether it is a single new socket or a full first-fix before the joiner arrives, get in touch for a quote.