A lategame way to reduce board cost from 4 to 3

I know it sounds odd but honestly when doing large builds wood chopping is one of things that really cost so much lumber just to make a board that I feel like maybe characters don't actually make it efficient on how they make those boards or something? I dunno, just saying that maybe having some sawmill science structure or tool later on we could have reduced cost for the boards. I at least sometimes gotta spend a whole season chopping just to get the amount I need for the moment till next one comes up...

Anyway: Discuss.