Help with shadows on creaed static mesh

Hello, I have create a 2 floor house for a horror game i am working on and come to realise that a lot of the walls have shadows that are triangaliated and it doesnt look good at all. I have tried turning off shadows/dynamic shadows, i have tried turning the lightmap resulution up and down and still no change, i have also checked the walls to see if i have any quads overlapping and i dont. There is a picture of thw wireframe and the parts that im having problems with.
Thanks.