How to Recess a Mirror TV Into a Bathroom Wall (Step by Step)

A surface-mounted mirror TV is a two-hour job. A recessed one, sitting flush with the tile so that the mirror reads as part of the wall, is a carpentry and waterproofing job that has to be planned before the plasterboard goes up. This guide covers the sequence in the order a contractor would follow it.

Decide on the finish detail first

There are three ways a recessed mirror TV can meet the wall, and the choice affects the cavity size:

1. Flush with the tile. The mirror face sits level with the finished tile surface, with a 2–3 mm shadow gap or a silicone joint around the perimeter. This is the cleanest look and the least forgiving of error.

1. Slightly proud. The mirror sits 5–10 mm forward of the tile. It hides small tolerance problems and is easier to remove for service.

1. Tile-in with a frame. A trim frame (usually anodised aluminium) is set into the tile line, and the mirror sits within it. Common in hotels because it standardises the detail across many rooms.

Whichever you choose, get the manufacturer's installation drawing for the exact model. Recess dimensions differ between sizes and between webOS and Google models even within the same range.

Check what is inside the wall

Before framing:

• Confirm the wall is not load-bearing where the cavity will go, or that the structural engineer has approved the opening.

• Locate existing services (pipes, cables, ducts). A mirror above a basin often sits directly over the hot and cold supplies rising to the taps.

• Check the wall depth. A standard timber stud wall (89–100 mm) usually accommodates a recessed mirror TV with room for cables. A 70 mm metal stud partition may not. A solid masonry wall needs to be chased or built out.

• Check the other side of the wall. A recess reduces acoustic and fire performance; in a hotel or apartment party wall, this may need a fire-rated back box.

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Frame the cavity

Build the opening like a window in the stud wall: a header and sill between two studs, with a plumb and level reveal.

• Width and height: the manufacturer's recess dimension plus a tolerance, typically 5 mm each side. Do not add more; the trim or shadow gap has to cover it.

• Depth: the unit depth plus clearance for cable bend radius and any drip clearance at the bottom. Most bathroom mirror TVs sit between 40 mm and 70 mm deep; add 20–30 mm behind for cables.

• Back box: many installers line the cavity with a steel or plywood back box, screwed to the studs, which gives a square, rigid frame to fix into. Some manufacturers supply a recess box or wall bracket designed to be set into the wall before tiling.

• Bottom edge: keep the sill at least 5 mm below the finished unit so that any condensation running down the back can drain rather than pool against the housing.

Photograph the framed opening with a tape measure in frame before it is boarded. Diagonals should be within 3 mm.

Plan the cable route

Two cables typically reach the recess: a low-voltage DC feed from the power supply, and a signal cable (HDMI, or Ethernet for an IPTV set). Some models also have a coax feed and an IR extender.

• Bring cables into the cavity from above or from the side, never from below where water could track along them.

• Route them so they enter through a sealed grommet or a section of wall that stays dry.

• Leave a service loop of 300–500 mm so the unit can be lifted out and rested on the basin while connected.

• Position the power supply outside the wet zones, in a cupboard, an adjacent room, or a ventilated void with access. It should never be sealed permanently into a wall.

• Run a spare conduit from the recess to the power-supply location. In ten years the smart platform will be retired and someone will want to add a device.

Read our bathroom TV electrical installation guide for the protective devices and zone rules.

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Waterproof the cavity

The recess is the one place where the wall's waterproofing has to turn a corner and stop. Treat it as a niche, like a shower shelf:

• Carry the tanking membrane or waterproof board into the recess and around all four faces.

• Seal the corners with tape designed for the membrane system.

• Seal cable penetrations with a compatible sealant or a proprietary gland.

• Slope the sill very slightly toward the room (1–2 mm) so water leaves rather than sits.

Allow the membrane to cure per the manufacturer's time before tiling.

Tile to the opening

Tiles are cut to finish at the recess edge with the same reveal all round. Two details matter:

• Edge finish. Cut tile edges around the recess are visible if there is a shadow gap. Use a mitred edge, a metal trim, or bullnose tiles. In a frame detail, the frame covers the cut.

• Tile thickness. The finished mirror face has to align with the finished tile face. Confirm tile thickness plus adhesive bed equals the depth from substrate to the front of the unit when it sits on its bracket. If the tile is thicker than planned, the mirror sits back; if thinner, it stands proud. Adjustable brackets exist for exactly this situation.

Grout the tile joints but leave the perimeter joint around the recess ungrouted for the time being.

Install the unit

With tiling complete and cured:

1. Fix the bracket or hang the unit into the back box per the drawing. Most sit on hooks or a keyhole plate and are pushed home.

1. Connect the cables before final positioning; use the service loop.

1. Power up and test picture, sound, remote reception (infrared has to pass through the glass at the designated window), Wi-Fi signal inside the cavity, and the demister. Metal back boxes and foil-backed board weaken Wi-Fi; if signal is poor, run Ethernet.

1. Check the reveal is even on all four sides. Adjust the bracket if needed.

1. Only then seal the perimeter. Use a neutral-cure silicone in a colour matched to the grout or the mirror edge. Leave a bead at the bottom edge with two small unsealed gaps (5 mm) to allow condensation to drain, or follow the manufacturer's advice on the bottom joint.

Order of work summary

Stage	Trade	Notes
Set out & check services	Contractor	Approve position, confirm wall depth
Frame opening / fit back box	Carpenter	Dimensions from manufacturer drawing
Run cables & conduit	Electrician	Power supply outside zones; service loop
Board & tank	Tiler / waterproofer	Membrane into recess, seal penetrations
Tile	Tiler	Finish to reveal; edge detail
Fit & test unit	Electrician / installer	Test before sealing
Seal perimeter	Installer	Leave drainage gaps at bottom

Common mistakes

• Framing the recess to the mirror size rather than the unit depth, and discovering the back does not fit.

• Sealing the power supply into the wall cavity.

• Grouting the mirror in. A hard grout joint cracks with thermal movement and makes removal destructive.

• No service loop, so the unit cannot be lifted out for a firmware reset.

• Tile arriving thicker than specified with no adjustable bracket on site.

Summary

A recessed mirror TV is a niche with electronics in it. Frame it square, tank it like a shower niche, run the cables from a dry direction with a service loop, leave the power supply accessible, and do not seal anything until the unit has been tested in place. Soulaca supplies recess dimension drawings for every model on the product page, and our team can review a wall section before you frame it.

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FAQ

How deep does the wall need to be? Most 22-inch to 43-inch bathroom mirror TVs need 60–100 mm total depth including cable clearance. Confirm against the specific model drawing.

Can I recess into a solid brick or block wall? Yes, by chasing the opening or building a stud pocket in front of the masonry. Allow for the extra work in the programme.

Does the recess need a fire-rated back box? In party walls, hotel corridors and apartment buildings, often yes. Ask the building control officer or the fire engineer.

What if the mirror is not perfectly flush after tiling? An adjustable bracket can move the unit 5–10 mm forward or back. A slightly proud detail (mirror a few millimetres forward) is the usual fallback.