'Paddle my/your own canoe'
I have never heard this in my work but my other half uses it at hers and has started saying it at home occasionally, it really grates on me.
Not many construction sayings I see.
"Stevie wonder would love to see it", hate this one, used by painters a lot.
"that's all over the place"
And a lot of smut and filth in between.
Come into the stationary cupboard and I'll Fix It for you.