Tell us your home's floor area, how many storeys it has, what the walls are made of and where the dead spots are, and we'll estimate how many mesh nodes you need and roughly where to put them. The honest answer is that node count is driven more by walls and floors than by square metres. A solid brick or stone house can need twice as many nodes as an open-plan flat of the same size.
Plan your mesh network
These figures are a planning starting point, not a guarantee. Thick chimney breasts, foil-backed insulation, underfloor heating and large mirrors all block Wi-Fi more than the wall type alone suggests. Buy a kit you can add nodes to later, place each node in open sight of the next one, and use a wired (Ethernet) backhaul between nodes wherever you can: it is the single biggest upgrade to mesh reliability.
== Summary of change == Only change vs original: added id="m-area-h" to the floor-area hint span so the input's aria-describedby="m-area-h" resolves to a real element. No formula, units, rounding, or behaviour changed. Working test file at /Users/liam/projects/future-business-media (QA scratch at /tmp/qa/mesh.html, /tmp/qa/test.js, /tmp/qa/dom.js).