Cost for project

[Monico Lorenzana]

Hello biggerpockets community. I'm a new investor working out things with my contractor. I've asked him to give me an itemized list for the work we're asking. But I don't have any other investor or contractor to compare the cost of the job to. 

Can anyone give me a ball park estimate on the cost to demo a wall with a small 24x48 window and install a 72x80 sliding door. Please include labor and material. I would really appreciate this thank you. I live out in LA county, Covina CA.