Now that size of font is sure to get my attention!!!! How did you do it?
First of all, it's a lovely tree.
One legal source gives the safe distance for a laburnum as 30 feet, but that a very cautious figure, and is for heavy clay soil that shrinks and expands a lot according to moisture level. A deciduous tree will suck up moisture when in leaf, during summer when the soil is naturally drier anyway. In winter when the soil is much wetter the tree does not draw up any moisture, so the effect of these trees in heavy clay soil is that the foundations can rise / fall a lot more over the course of a year. In well drained soils you can plant much closer. In practice, I have read somewhere that very few instances of subsidence damage occur where the tree is 16 feet or more away from the house.
A couple of other things to consider:
Laburnum pods / seeds are very poisonous, so don't plant one close to a pond that has fish it it, and bear in mind that inquisitive young children might try eating a seed.
Careful not to plant above drainage. It can be expensive to repair.
