Camilla Belle, who has probably one of the soothingest voices ever.
Ohh, how 'bout Christopher Lloyd (doing Emmett “Doc” Brown)?
Alfred Pennyworth.
I looked on Hulu, where the Simpsons episodes are, and they don’t have it. It’s from the Treehouse of Horror XII (2001).
I was initially thinking Pierce Brosnan, but I don’t want my house to start putting the moves on me… then I saw
That’s what I’d pick, especially if I had a longing for creating my own planet, covered in fjords.
Oooo, good one!
If the computer voice is female, of course Majel Barret is the only option. Hell, she’s recorded enough lines as a computer to where you could probably get enough samples to make it work, even with her passed away.
For a male voice, Malcolm McDowell.
Alternately: Richard O’Brien or Nell Campbell
Comedy Options: Harlan Ellison (reprising his role as Babylon 5’s short-lived AI, so cast because he had the most annoying voice JMS could think of) or Maggie Smith (ala Professor McGonagall: “The new paint in the foyer looks marvelous. 50 points for House Hufflepuff!”)
I second the voice of HAL in 2001.
Then the guy asking the questions on the lie detector in the new " The Day the Earth Stood Still".
Peter Jones, the voice of The Book on the tv series version of Hitchhiker’s Guide to the Galaxy.
or else the guy that voiced Marvin “Life. Don’t talk to me about life.” "Brain the size of a planet and they leave me in a car park ". Wiki says his name is Stephen Moore.
Stephen Moore (actor) - Wikipedia
Although Alan Rickman also has a very nice voice.
Aha! Well, while I’m thinking of it, before this thread slips into the depths for another five years, AND if I get tired of my idea of Mr. Frees as my house voice, I’m also going to suggest…singer/actress Mary Elizabeth McGlynn.
'Couldn’t find a proper demo reel, unfortunately, but probably most of the people in the robot-house-wanting demographic would have heard her work, one place or another, anyway. 
The Lifestyles of the Rich and Famous guy. Robin Leach?
Luther, out of The Warriors.
James Earl Jones for my alarm clock robot. “I find your lack of motivation disturbing to me.” Yikes.
William Daniels.
And since a robohouse would be so high tech as to have different voices for different things, I’d also pick Hugh Laurie (as House).
How 'bout Marvin The Martian?
Unless you were in the bathroom, then he could tell you to go number 1. 
My choice: Thurl Ravenscroft.
Garrison Keillor. For sure.
I like all the suggestions. I guess I’m easy. I’d be happy with any voice except my mother’s.
Jeremy Irons for most purposes, partly because he’s done taken on so many movie roles with a sexy, bad-boy edge to them, rrroww!
But I want Muse frontman Matt Bellamy’s whistle-register howling to be the voice of my smoke alarm!
Kevin Spacey.
Ok…I might have to add him, too. That would crack me up.
Edit: You know, he has the voice for it, but…has Buscemi done much voice work? I think he’d be great at it, but I can’t think of anything.