You did everything right — dual-band router, bands split, devices assigned sensibly — and there's still one spot in the house where wifi barely works. A dual-band router narrows down what's wrong, it doesn't automatically fix range. Here's how to actually diagnose it before spending on more hardware.

Step 1: Rule out the band

Walk into the dead zone with your phone and check which networks are visible. If you see the 2.4GHz name but not 5GHz, that's expected — 5GHz has a shorter range. If you don't see either network, this isn't a band issue, it's a range or obstruction issue, and the next steps matter more.

Step 2: Check what's between you and the router

Concrete walls, especially load-bearing ones, and floors between levels are the biggest signal killers in Indian homes. Metal — reinforced concrete, mirrors, metal cupboards, even large appliances — blocks wifi far more than drywall does. If your dead zone is on a different floor, or behind a concrete wall, or near a large metal cupboard, that's very likely your answer.

Step 3: Check router placement

A router tucked inside a TV unit, behind a cupboard door, or in a corner of the house loses range in every direction that's blocked. Placing it centrally, off the floor, and away from metal or thick concrete usually recovers noticeable range without buying anything.

Step 3: rule out interference

If the dead zone is inconsistent — sometimes fine, sometimes not — rather than always weak, that points to interference rather than distance. Microwaves, cordless phones, and neighbouring routers on the same channel mainly affect 2.4GHz. Try switching the 2.4GHz channel (see our WPA3/channel settings guide) before assuming you need new hardware.

What this diagnosis tells you to do next

If your diagnosis points to needing extra hardware, compare your options in "Wifi Extender vs Mesh System vs New Router: What Actually Fixes Patchy Coverage." For the setup basics, see our main dual-band guide.