Light switch installation and replacement in Warsaw — fast and safe

The switch clicks but the light doesn’t come on. Or it doesn’t click at all — it sticks, sparks when pressed. Sometimes you simply need a new switch after a room layout change, or a dimmer instead of a standard toggle. All of this is sorted in 20–40 minutes on site. We handle electrical work across Warsaw — from Żoliborz to Ursynów.

Important: any work involving electrics carries a risk of electric shock. If you’re unsure you’ve correctly isolated the circuit — don’t touch the wires, call a professional. We only work with the power off and test every wire with a voltage indicator before starting.

How much does it cost and what affects the price

Current prices are in the table below. The cost depends on the switch type (single-pole, double, two-way, dimmer, touch), wiring condition, and whether wall chasing is needed. A brand-new point from scratch includes an electrical point installation, wall chasing, and cable routing. Fixings and terminal blocks are included. The switch itself and the back box are charged separately.

How the on-site work goes

1. You describe the task — exactly what’s needed: replacing an old switch, relocating one, or installing a new one.
2. The technician confirms the switch type and wiring (single phase, two-gang, two-way).
3. On site, the technician isolates the circuit at the consumer unit and verifies zero voltage with an indicator.
4. Removes the old switch, checks the condition of the wires and back box.
5. Connects the new switch, secures it in the back box, fits the face plate.
6. Switches the breaker back on and tests — the light should turn on and off with no sparking or delay.

Common customer mistakes (and how to avoid them)

• Replacing a switch with the power still on — this is life-threatening. Always turn off the breaker at the consumer unit, not just the switch itself.
• Buying the wrong switch type — there are single-pole, double-pole, two-way, and intermediate switches. They look similar but have different wiring diagrams.
• Swapping live and neutral when connecting — the switch must break the live wire. If it breaks neutral, the lamp holder stays energised even when the light is off.
• Pushing wires in without terminal blocks — bare twists oxidise, the connection fails, and sparking starts.
• Fitting a switch into an old, cracked back box — the mechanism won’t hold and falls out of the wall.
• Ignoring the smell of burning plastic — this means a contact is overheating, which can lead to fire.

What to prepare before the technician arrives

• Locate your consumer unit and identify which breaker covers the relevant circuit.
• If buying the switch yourself — ask the technician for the type (flush/surface-mount, number of gangs, two-way needed?).
• Take a photo of the current switch and send it to the technician — this helps identify the back box type and mounting.
• If relocating the switch — mark the desired position on the wall.
• Clear access to the wall — move furniture and pictures.
• Make sure there’s a power socket available for tools (if chasing is required).
• Provide access details: intercom code, parking info.
• Bundle all electrical tasks into one visit (sockets, lights, switches) — it’s more cost-effective.

A real case from Warsaw

A client in Mokotów asked to replace three switches: two single-gang and one double-gang in the hallway. When we removed the first one, the wires were joined with bare twists — no terminal blocks — and the insulation had melted from overheating. The second switch had live and neutral reversed, leaving the chandelier energised even in the off position. The technician replaced all three mechanisms with Legrand Valena units, fitted Wago connectors on every joint, and corrected the polarity. The job took 1.5 hours. The client noted the switches no longer clicked with a delay or sparked. Takeaway: if a switch is over 10 years old, check all the connections — not just the mechanism.

Frequently asked questions

Can I replace a switch myself?
Technically yes, if you’ve definitely isolated the circuit and understand the wiring diagram. But if the cables are aluminium, old, or unmarked — call a professional.

Which switches do you recommend?
Legrand, Schneider, Simon, Hager — reliable, widely available, standard back-box size. Avoid no-name products from market stalls.

Can I fit a dimmer instead of a standard switch?
Yes, if the bulbs are dimmable (LEDs marked “dimmable”). Standard LEDs with a dimmer will flicker or not work at all.

How long does replacing one switch take?
15–25 minutes if the back box and wiring are sound. If repair is needed — up to 40 minutes.

What should I do if a switch sparks?
Stop using it. Turn off the breaker at the consumer unit and call a professional. Sparking indicates a poor connection or overload.

Can other electrical jobs be done in the same visit?
Yes, and it’s more cost-effective. Collect all your tasks — the technician will handle everything in one trip.

Who does the work

Switch installation and replacement is carried out by electricians experienced in domestic wiring. We cover all of Warsaw. Call or message us — we’ll advise whether a visit is needed or you can handle it yourself.