Building a new bedroom on a house? Is it worth it?

[Ryan Randalls]

I'll start by saying I'm very new to real estate, I'm looking into doing a live in flip in my area and there is a 1bd 1ba that can use some basic updating. But my question is; 

would it be worth adding a bedroom? 

I mean fully expanding the house. I know thats a big project for a beginner, but there is a big gap in price and days on market between 1 and 2 bedroom houses. I'm mostly just curious, 

What's the typical price range for such a project?

I Know it depends a lot on area, the contractor, permits, and a lot of other factors. I'm just looking for a ballpark figure, nothing super special, just best/ worst case scenario, and to expand my knowledge on the subject. Has anyone has done something similar successfully or unsuccessfully? 

If it helps my area is Frazier Park, CA it's in Kern county, south of Bakersfield, CA