By the SightShield team · · 3 min read
The cheapest time is before plastering
Most of the cost of a smart home is in devices that can be bought any time. What cannot be added cheaply later are the cables and boxes inside walls and ceilings. If your home is under construction or being renovated, a few hours of planning with the electrician now avoids breaking finished walls later — and keeps your options open even if you automate only part of the house at first.
Checklist for a new build
- Neutral wire at every switch box — most smart switches need it.
- Deep back boxes (or modular boxes sized for smart switches) at switch points.
- Separate lighting circuits for coves, downlights, pendants and decorative lights.
- A Cat6 cable to each TV, desk, ceiling access point and CCTV camera position.
- A power point at each window to be motorised, hidden in the curtain pocket.
- A network and automation cabinet with power, near the ISP entry.
- Conduits to the main gate for the video door phone, gate motor and camera.
- Spare empty conduits between floors for future cables.
- If choosing a wired system such as KNX, the bus cable to every keypad and the central panel space.
What still works in a finished home
A great deal. Retrofit smart switches fit existing switch boxes where there is a neutral and enough depth. Wireless sensors, smart locks, battery curtain motors, IR controllers for ACs and smart plugs need no new wiring. Mesh or wired access points improve Wi-Fi. The result can be very good — it just relies more on wireless devices and occasional battery changes.
Retrofit options room by room
| Room | Retrofit approach |
|---|---|
| Living room | Smart switches and dimmers in existing boxes; smart bulbs for lamps; battery curtain motors |
| Bedrooms | Smart switches; IR controller for the AC; motion night lights |
| Kitchen | Leak sensors; smart plug for appliances; gas and smoke sensors |
| Main door | Smart lock that fits the existing door; video doorbell |
| Whole house | Mesh or wired access points; a hub that supports Matter |
Comparison
| During construction | Retrofit | |
|---|---|---|
| Wiring flexibility | Full | Limited to existing boxes and routes |
| System type | Wired, wireless or hybrid | Mostly wireless |
| Disruption | None extra | Some, room by room |
| Curtains | Wired motors | Battery motors |
| Cost of cabling | Low | Higher, where it is possible at all |
Bring everyone in early
The architect, electrical consultant, interior designer and automation installer should agree the plan before the electrical drawings are final. A single plan for lighting circuits, switch positions, curtains, CCTV, Wi-Fi, door phone, gate automation and central vacuum avoids duplicated cabling and surprises at handover.
Plan automation for your new home →Typical timeline for a new build
- Design stage: decide lighting circuits, switch positions and automation scope.
- Electrical conduit stage: lay conduits, back boxes and network cables.
- Before plastering: check every cable and box against the drawings.
- False ceiling and interiors: fix curtain pockets, AP positions and sensor locations.
- Final fix: install switches, hubs, devices and programme scenes.
- Handover: train the family and adjust scenes after a few weeks.
Quick answers
Why do smart switches need a neutral wire?+
The switch needs a small amount of constant power to stay connected. Many older Indian switch boxes have only the live wire, which limits retrofit options.
Should I automate everything during construction?+
Not necessarily. Lay the cabling and boxes now; devices can be added in stages later.
Can automation be added after interiors are done?+
Yes, using retrofit switches and wireless devices, though choices are narrower.
Do you coordinate with our architect and electrician?+
Yes. We review the electrical drawings and mark the automation, network and security points for the electrician.
How long does retrofitting a 3BHK take?+
Usually a few days for switches, sensors, locks and hubs, done room by room.
Will retrofit switches fit my modular switch plates?+
Many retrofit modules fit standard boxes; some replace the plate entirely. We check on the survey.