To renovate basement or not for appraisal?

I want my appraisal to be 275k. Should I talk to an appraiser before the bank gets an appraisal? Doing a cash out refinance. 

Because of it's not going to appraise that high, I could finish the basement fairly easily. (And then it should definitely appraise that high.) 

Thoughts? Specifically I could add a French door to a room to make it a bedroom. The basement can be made into two additional bedrooms. I would finish 4/6 rooms down there with proper egress and optional ventilation. It's a huge house with tall basement ceilings.