Smart Home Basics for Indian Homes

The decision that has to happen before the wiring

Indian switch boxes traditionally carry only the live and the switched live — no neutral. Almost every smart switch and smart dimmer needs a neutral to power its own electronics. If your flat is being rewired, adding a neutral to every switch box costs almost nothing at that moment and is close to impossible later without chasing walls again. This is the single decision that determines whether automation is a ₹30,000 retrofit or a ₹90,000 one in three years' time.

Ask for it explicitly on the electrical drawing: 'neutral to be drawn to every switch box'. Contractors do not do it by default because it uses more cable and takes longer, and most clients do not ask. The cost difference on a 2BHK is roughly ₹4,000–₹8,000 of additional wire and labour.

Three levels of automation

Technology

Design and build under one accountable roof

Protocols, and why it matters

The protocol decides whether your system still works in five years. Wi-Fi devices talk to a manufacturer's cloud server; if the company stops supporting the product or your broadband goes down, the device becomes a manual switch at best. Zigbee and Z-Wave devices talk to a local hub in your flat and keep working without internet. Matter, running over Thread, is the current convergence standard and is the safest specification for anything being installed new in 2026.

• Wi-Fi: cheapest, no hub, worst resilience. Fine for a single smart plug, poor as the basis of a flat.
• Zigbee: mature, local, mesh-networked, wide device choice in India. The pragmatic default.
• Z-Wave: reliable and local but a narrower Indian device range and higher cost.
• Matter over Thread: the standard worth specifying for new installations; cross-brand and local-first.
• Proprietary wired bus (KNX and similar): the most robust and the most expensive, appropriate for whole-home automation in larger flats.
• Avoid mixing three ecosystems. Two apps is an irritation; four is why families stop using the automation altogether.

What is worth automating, in order

1. Lighting scenes. The highest-value automation in any home. Four scenes — morning, working, evening, night — do more for how a flat feels than every other device combined.
2. Curtains and blinds. Motorised tracks at ₹14,000–₹38,000 per window. In a west-facing Mumbai flat, closing the blinds automatically at 2 pm measurably reduces the AC load.
3. Air conditioning. An IR controller per unit at ₹3,000–₹7,000 lets you pre-cool a bedroom and, more usefully, ensures the AC is off when nobody is home.
4. Geyser and water heater. A ₹2,500 smart switch with a schedule is the fastest-paying automation in the house; most Indian geysers are left on far longer than needed.
5. Door lock. Useful for households with domestic help and deliveries. Specify one with a mechanical key override and local Bluetooth unlocking.
6. Cameras and sensors. Worth it for a flat that is empty for long periods; consider local storage rather than cloud subscriptions.
7. Voice assistants. Genuinely convenient, and the least important item on this list. Do not design the system around them.

Designing for failure

This is the part Indian installations most often get wrong. Mumbai flats experience power cuts, brownouts and broadband outages, and a household includes people — parents, guests, domestic staff — who did not install the system and should not need an app. Every automated point must therefore have a physical control that works on its own: a real switch, a wall button, or at minimum a scene panel that operates locally without the hub.

The test we apply before handover is simple. Unplug the router, switch off the hub, and walk the flat with the client. Every light, fan and curtain should still be operable by hand within a few seconds. If anything cannot be, it is redesigned. A flat where the guest bedroom light cannot be turned on because the Wi-Fi is down is not a smart home; it is a fragile one.

A costed 2BHK, three ways

Specify the manual override first and the app second. Every family has someone who will never open the app.

Greenbox principal designer

Who maintains it in year three

Automation is the only part of an interior that has software, and software needs an owner. Three years after handover the hub needs a firmware update, a device has dropped off the network, the installer's company has changed its app, and the family member who configured it has stopped being interested. This is the most common way a smart home stops being smart, and it has nothing to do with the hardware.

Two things reduce the risk. First, keep the system documentation — a one-page sheet listing every device, its room, its protocol and the hub it pairs to, plus the admin login. We hand this over laminated with the warranty pack, and it is the document clients most often lose and most often need. Second, prefer widely supported standards over an installer's proprietary ecosystem, so that any competent technician can take over if your original installer disappears. A system built on Zigbee or Matter can be adopted by someone else; a system built on a bespoke controller from a company that has stopped trading cannot.

• Ask what happens if you stop paying a subscription. Cameras and locks are the usual offenders.
• Ask for the admin credentials at handover, not the installer-managed account. Clients who do not have these cannot change installers.
• Keep spare modules. Two spare smart switch modules at handover costs ₹3,000 and avoids a mismatched plate in year four.
• Budget an annual service visit of ₹3,000–₹6,000 for firmware, re-pairing and battery replacement in sensors.

Selected work by Greenbox Design Studio. Tap any image to enlarge.