Domestic distances are usually much lower than the 100 metres that these cables are certified to support at the appropriate speeds.
I've pushed my network in the other direction, using 4-core telephone cable up to about 25m, it works fine for TV streaming and many other functions and is much easier to route.
I "think" it's only supposed to run at 10mbps though I have my suspicions that I might get more than that.
Edit: In fact it seems to reach 100mbps only requires 2 pairs, it's Gigabit that needs all 4.
It's a long time since I ran the cables and I've forgotten my researches at the time, but I think all devices are configured at 100mbps and works fine.
The cable is "sort of" (but probably not exactly) Cat3 I believe.