[beepbeep]

Hi,

Yes, this is the size of office building so you need to treat it as such (mobility-wise) despite bandwidth requirements being lower.

I had similar problem (smaller house though) and solved it by deploying multiple 802.11ac access points (5GHz only) with PoE and careful channel planning and 802.11r roaming enabled (this allows you to roam from AP to AP without dropped calls).

If you are IT savvy, you can build it yourselves for fraction of price (I did), otherwise let somebody build it for you.

Couple of hints:
- 2.4GHz is not used in such installations. It is slow, interfercence prone, there are too few channels and it is generally a mess. 5GHz is way to go. Disable legacy rates too.
- Use same model of APs everywhere. Theoretically they are mixable but 802.11r roaming is hard to get working between different models.
- Careful channel planning is a must. Adjacent APs should never use same channels. Keep Channel width to 20MHz (should net you at least 15MB/s (Megabytes, not Megabits. Capital M).
- Sometimes, less power works better. I had to dial down power to 100mW. Too much power makes devices to "not let go" when moving. You want to roam as you go.
- Use same SSID and pw across the network, or roaming will not work.


P.S.
I have built all of this with PoE switch, a load of second hand TP-Link Archer C7 v2 routers bought cheaply, reconfigured as AP's (using OpenWRT) and fed via PoE ejectors. 300Mbi/sec all over the place, zero issues. I have also heard good thing about Ubiquity , if you do not have knowledge.