Replace a wired doorbell with a wireless one

Swap a wired doorbell for a wireless one, safely disconnecting the old wiring and fixing the new push button to any wall.

WD-01Gather your kit and toolsBuy a wireless doorbell kit with a bell push and a chime unit. You'll also need a screwdriver, a cordless drill with masonry and wood bits, a cable/pipe detector, and some wire connectors for capping off the old wiring. Check the kit's stated range covers the distance from your front door to where you want the chime.

1 each · Wireless doorbell kit

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1 each · Cable/pipe detector

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1 pack · Wire connectors (small)

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WD-02Turn off the power before you touch any wiringYour old wired doorbell runs off a mains transformer, so treat it as mains work. Find your consumer unit and switch off the circuit that feeds the doorbell transformer — if you're not sure which one it is, turn off the main switch. Cables can run in unexpected places even in a simple bell circuit, so if there's any doubt at all, isolate at the consumer unit before you disconnect anything.

WD-03Remove the old wired bell pushUnscrew the old bell push from the wall or door frame. Behind it you'll find two low-voltage wires — note or photograph which terminal each one is on, then disconnect them. Cap both wire ends separately with a wire connector so they can't touch, then tuck the cable back into the wall or behind the frame.

WD-04Deal with the old transformer and wiringFind the transformer — it's usually a small box near the consumer unit, in a cupboard, or wired into a socket or fused connection unit. If it plugs into a socket, just unplug it and remove it. If it's hardwired into a fused connection unit or the fixed wiring, cap the ends safely and leave it isolated rather than trying to remove the accessory yourself unless you're confident.

RULES

KNOW THE RULES

Altering fixed wiring (for example removing a hardwired fused connection unit) falls under Part P of the Building Regulations. Capping off and leaving wiring safely isolated is fine for most people; removing accessories from the fixed wiring is notifiable work in England if you're not a registered electrician.

WD-05Pick a spot for the new bell pushChoose a spot by the front door about 1400mm up, sheltered from direct rain if possible. Before fixing anything permanently, hold the bell push in place and test it against the chime unit from inside to check the signal reaches.

WD-06Fix the bell push to the wallBefore you drill, run your detector over the spot and still assume something could be there — detectors miss cables that are deep, in metal conduit, or outside the usual safe zones. Find your stopcock (usually under the kitchen sink) and check it turns, and if there's any doubt, isolate the circuit at the consumer unit before drilling. To find out what's behind the wall, run a magnet or stud detector across it looking for a line of screw heads, tap for a hollow sound between studs, and check a small pilot hole — timber dust means a wood stud, fine grey swarf means a metal stud. On solid brick or block, drill a 6mm hole about 30mm deep and use a wall plug with a 6x25mm screw. Into a timber stud, drive a 4x25mm wood screw straight into its centre — no plug needed. Into a metal stud, use a self-drilling metal-stud screw, never a wood screw or plastic plug, as they strip straight through 0.5mm steel. Onto plasterboard between studs, use a small self-drilling plasterboard fixing rated for the light weight of a bell push. On dot-and-dab plasterboard, use a longer screw (around 60-75mm) that passes through the board and adhesive dabs into the masonry behind. On lath and plaster, try to locate a solid timber stud behind the laths and screw into that; if you can only find lath, use a fine pilot hole and a light plasterboard-style fixing, as laths crumble easily.

1 pack · Wall plugs (assorted, masonry/plasterboard)

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2 each · Self-drilling metal-stud fixings

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2 each · Wood screws 4x25mm

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WD-07Fit the chime unit indoorsPlug the chime unit into a socket, or fit batteries if it's a battery-only model. Put it somewhere central, like a hallway, so you can hear it from most rooms. If you want to fix it to a wall rather than sit it on a surface, follow the same fixing rules from step WD-06.

WD-08Fit batteries and pair the unitsFit batteries into the bell push following the kit's instructions. Put the chime unit into pairing mode, then press the bell push once to sync them — most kits confirm pairing with a light or a chime.

1 pack · Batteries for bell push (as specified by kit)

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WD-09Test and tidy upPress the bell push from the front door and check the chime sounds inside, then test from a couple of other spots to confirm range. Tidy away the old wiring and transformer, sweep up any drilling dust, and fill any leftover old screw holes with a dab of filler. Recycle the old wired doorbell parts at a WEEE recycling point rather than binning them.

1 each · Multi-purpose filler (small tube)

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