Since this is an outdoor space, I didn't factor in paint colors. For the rendering, we did cedar walls in the pergola with a black powder-coated steel frame.

It wasn't part of the design brief, but when you are finishing the bathrooms in the pergola building my suggestion would be to keep it light and fresh with crisp white paint. My personal favorite is Benjamin Moore's, Chantilly Lace.

Use a matte finish paint because it will be helpful in camouflaging those surface imperfections such as bumps and cracks as it does not reflect light. Just be careful because matte finish is more difficult to clean. You may also need to touch up scratches or marks by adding more of the same paint in the future.