There’s already plumbing but I would have to merge electrical / heating. 

According to most cities, anything that alters the structure of the home, or the layout of the home (new walls, doors, windows, changing floor plan), or any new or altered plumbing, electrical, ductwork requires permits.3.

Did the back building already have plumbing in it?

Here's a more detailed quoteMisc:*Cleanout Apartment*Pressure wash Porch and front of house*Fix broken stairwell window*Replace all door hardware and stops*Repair Back door*Repair/Paint Back Porch*Replace 2 window screens*Install towel bars and Toilet Holders*Repair Storm door*Repair Stairwell door latch*Clean Apartment after all work is completedPainting:*Repair all drywall patches and caulk all necessary seams*Paint all walls and Trim in apartment*Paint Basement Stairs*Paint/Seal Basement FloorElectrical:*Replace all Outlets and Switches*Replace Hallway Light Fixture*Add 1 Light Fixture to BedroomBathroom:*Caulk Tub and SurroundKitchen:*Replace Kitchen Cabinets with Wolf Brand Builders Grade Shaker*Replace Kitchen Floor with Coretex Clickboard Flooring*Replace countertops with 3/4" stock laminated countertops (Renter'sGrade)*Replace Stove and Refrigerator*Replace Kitchen plumbing and Install new drop in sink*Repair all Necessary Trim*Replace 1st Bedroom Floor to Eliminate Warping issuesLabor Hours 10,000.00TMaterials purchased specific to job 13,680.00TDumpster/ Disposal Service 500.00T

Hi all,I have my next property under contract in Raleigh NC, for a flip/BRRRR and I am looking for a GC who can help manage all the plumbing, electrical, Kitchen, bathroom, floor layout adjustments and permitting.Ideally looking for someone who has worked with investors or is an investor and can help manage costs instead of providing retail pricing for all the work.Thanks!

DO repairs/rehab on electrical and plumbing systems.

You can have the sewer reviewed with a camera that will give you insight on one of the more costly plumbing repairs. 

Replaced plumbing, roof, gutters, 1 AC unit, 1 bath and 1 kitchen.

Sometimes the smallest change in design can make a vastly significant difference in the price for the remodel; i.e. moving a load bearing wall Vs. a non-load bearing, or not realizing until you open up a wall that there is a main plumbing stack that now needs to get relocated!

There have been some fairly major plumbing issues.