I've seen 3 phase in homes before, one was the farm where I used to live, the supply, fuses and meter where in the house for all the farm machinery, and perhaps a more apt application was a mates house where he had electric economy 7 storage heaters, these were fed from 240v single phase however the load for all the heaters were spread accross all 3 phases (some on each phase).
In the uk there are fairly strict rules for domestic wiring, you really ought to check your covered to do such work, house insurance can be invalid if works isnt carried out by someone with the correct certificates.
Unless you have very heavy loads like multiple storage heaters or industrial equpiment there isnt really a serious need for 3 phase in a domestic situation, in fact its more of a risk than an asset.
If you want to power a small machine like a mill/drill or small industrial machine like a small pump then you can get variable speed drives that convert single phase into 3 phase, the output is 3 x 220v rather than the usual 3 x 415v, this normally isnt a problem as most small motors can be reconfigured from 'star' connected to 'delta' connected, which converts from 415v to 220v, such drives only go up to about 2kw (1.5hp or so).