How much wire does a 3BHK actually need?

Wire is the easiest line on a quote to inflate. It's bought in 90-metre coils, it disappears into conduit within a week, and no homeowner is going to count it afterwards. A little padding on every size adds up quickly across a house.

You don't need to become an electrician. You need a rough expectation, so that a number twice the size of it starts a conversation instead of getting signed.

The usual shape of a 3BHK

For a typical 1,200–1,500 sq ft 3BHK with standard point counts, the wiring usually lands somewhere around:

• 1.5 sqmm — 6 to 8 coils. Lighting circuits, fan points.
• 2.5 sqmm — 5 to 7 coils. General power sockets.
• 4 sqmm — 2 to 3 coils. Geysers, heavy sockets.
• 6 sqmm — 1 to 2 coils. AC points and the kitchen line.
• Earth wire (green) — roughly matched to the 2.5 and 4 sqmm runs.

What legitimately moves the number

• Number of ACs. Each one is its own heavy run back to the board.
• Distance from the distribution board — a long, narrow flat uses much more than a square one of the same area.
• Modular kitchens with lots of appliance points.
• Concealed conduit runs that go up and over rather than straight across.
• False ceilings with many light points — this is where 1.5 sqmm gets used up.

If your quote is more than about 30% above these ranges, ask for the point count per room. A fair electrician will have it ready.

Where to actually spend

Don't cheap out on the conductor. A wire with less copper than it claims runs hotter for the same load, and that heat lives inside your walls for the next thirty years. Buy ISI-marked wire to IS 694 from a real brand and verify the BIS licence number rather than trusting a sticker.

The upgrades genuinely worth paying for are flame-retardant low-smoke insulation on the lighting and socket circuits, and proper earthing throughout. Both matter on the worst day, which is the only day they'll ever matter.

Before you sign

• Ask for point counts per room, not just a total metre figure.
• Confirm the brand and the IS number on every size quoted.
• Check colour coding is specified — it makes future fault-finding far cheaper.
• Keep the leftover coils. They're yours; you paid for them.