Small vigorous trees to create shade

[JustPinkFinch]

I've made a terrible terrible mistake and bought a house with a south facing garden. I am now planting trees about the place to create shade.

Currently looking for a small tree (up to 5/6 metres max) for an east border that gets full sun all day. Definitely nothing that gets huge or is particularly thirsty as it's about 5m to the house. I already have a young crab apple nearby, it will sit next to that.

Currently considering an Acer Negundo Flamingo or an Amelanchier Rainbow Pillar. I don't have acid soil (we're actually quite chalky) is my only worry re the latter, yet I am growing an amelanchier obelisk elsewhere in the garden that looks very healthy.

Any other suggestions for quick growing small trees that aren't too fussy and love sunshine?

Thanking you.

Judas tree. They grow fast but don't get particularly tall, and the leaves are massive, so create a lot of shade. They tolerate pruning well too. The one we have in our garden has been an absolute godsend this year.

This is a great suggestion, thank you!

Slightly disconcerting how it got its name, but I'll gloss over that and focus on the shade 😬

@JustPinkFinch It also has sensational flowers that sprout right out of the trunk.