hello, i live in a large home
Oh really! So a mansion, then. Nice! Mansion actually comes from the Latin word for dwelling, so it's just a fancy way of saying home!
I wish it was a mansion just a big house
Honestly the definition isn't that strict. It really just means a place for a lord who remains there, so that could easily still be you!
then I am lord of my dwelling 
That's the spirit. And if you ever make the house bigger or add on to it anyway, its new considerable size could make it qualify as a palace!
are there specific sizes or is it more subjective on what to call it
Eh, mansion, palace, kingdom, castle, it's whatever makes you happiest, right? Whichever one hold the most significance for you. :)
so my next step is a palace :)
would "remain" there...
History.
Within an ancient Roman city, aristocratic people or just wealthy dwellings might be very extensive and luxurious. Such mansions on one hill in Rome became so extensive that the term palatial was derived from the name Palatine hill and is the etymological origin of "palace". Mansions of considerable size and state significance are called palaces.
Following the fall of Rome the practice of building unfortified villas ceased. Today, the oldest inhabited mansions around the world usually began their existence as fortified
wish you did better or maybe a little differently. I've never been able to avoid that, even with this. There's things that I wish I had done maybe a little differently. But that also comes with just listening to it and living with it for so long that until it's done you won't really hear things in that way until it's like too late I guess. But I would say for the most part that I'm really happy with it.
Title.
According to Skiba: