I can think of a couple of ways to say it:
1. Doble ang layo = Double the distance
2. Dalawang beses ang layo = Twice/Two times the distance
The first one would be the more common way to express it.
"Ang layo ng bahay mo. Doble ang layo sa bahay ko." = Your house is quite far. It's twice the distance to my house.
"Layo" can be used to mean both distant and distance.