If you already know roughly what a modular switch is and you are now trying to decide what to actually install, this is the comparison you need. (If you are not sure what “modular” means in the first place, start with our guide to what a modular switch is and come back.)

There are really two separate decisions here, and most guides blur them together:

1. The type: a non-modular “piano” switch, or a modern modular switch?
2. If you go modular, the mounting: surface-mounted (a box on the wall) or flush/concealed (recessed into the wall)?

Getting these straight matters, because the second one — mounting — is widely misunderstood, and it often decides what is actually practical for your space. Let us take them in turn.

Decision 1 — Piano (non-modular) vs modular

Non-modular “piano” switches

The older style is the piano switch — named in India for the way its large rocker tilts like a piano key. These are self-contained switches, and the setup is refreshingly simple: you buy the switches, screw them onto a board, surface-mount the board on the wall, and run the cable. No wall-cutting, no planning of recesses, no concealed boxes.

That simplicity is the piano switch’s real, often-overlooked advantage. If you need to add a point quickly — in a utility area, a shop, a village or low-income setting, a temporary or under-construction space — a piano board is cheap, needs no wall work, and goes up with four screws. For that job, nothing beats it on cost and speed.

The trade-offs: it protrudes more from the wall, the look is utilitarian, and finish options are limited. The switch mechanics are basic. It is the budget, no-frills choice.

(You may also come across “semi-modular” switches — a cheaper, screw-fixed cousin of modular, now rare and mostly seen where a builder pre-installed them in budget flats. They are uncommon enough that they are not a real choice for most buyers, so we will not dwell on them here.)

Modular switches

Modular switches are built from standardised modules that clip into a frame, covered by a decorative plate. The result is a flush, slim, finished look, with a wide range of colours and finishes including glass and matte — and the flexibility to change a single module or add a point later. They cost more than piano switches, because you are buying a quality system rather than a basic single-piece switch.

For almost any space where the switchboard is visible and you care how it looks, modular is the sensible default. The real follow-up question is not whether modular, but how it is mounted — which is Decision 2.

Decision 2 — Surface-mount vs flush-mount (for modular)

This is the part most guides skip, and it matters. Modular switches come in two mounting styles, usually at similar cost:

Flush / concealed mounting

The back-box is recessed into the wall, so the plate sits flush against it — the clean, built-in look most people picture when they think “modular.” The catch: it requires wall work. Slots and recesses have to be cut (chased) into the wall for the boxes, and conduit run. That is straightforward during new construction or a full renovation, when the walls are open or being worked on anyway. It is messy and disruptive to do in a finished, occupied space.

Surface mounting

Here the box sits on the wall surface and is screwed on — like a piano board, but holding modular switches. You still get the good-looking modular switch and its finishes; the only difference is the box protrudes slightly instead of being recessed.

The big advantage: no wall-cutting needed. This is the answer for anyone who wants the modular look but cannot or does not want to chase channels into finished walls — most commonly when renovating or upgrading an existing place without tearing up the walls. You keep the modular aesthetic and skip the construction work.

So the common assumption that “modular means you have to cut into the wall” is simply not true. If your walls are already finished, surface-mount modular gives you the look without the mess.

Putting it together: which should you choose?

• New home or full renovation, walls open, you care about looks: modular, flush-mounted. The premium, built-in result.
• Existing finished space, want the modular look without wall work: modular, surface-mounted. Same switches, box on the wall, no chasing.
• Budget point, utility/temporary space, looks not important, quick add-on: piano switches on a surface board. Cheapest and fastest.

Reliability, by the way, tracks brand and build quality far more than it tracks piano-vs-modular — a good piano switch outlasts a bad modular one. Buy a reputable brand whichever route you take.

If you have settled on modular, the next questions are which brand and what size — covered in our guides on the best modular switches in India and modular switch sizes (1M, 2M, 3M) explained.

A quick safety note

Whichever you choose, mains wiring and switch installation should be done by a qualified electrician. Changing a cosmetic plate is fine to do yourself; connecting live circuits is not. If an existing switch sparks, heats up, or behaves oddly, switch off the circuit and call an electrician rather than opening a live board.