Flipping houses is not at all care about you see on those television shows. There’s not a lot of time spent choosing trendy finishes & putting in gourmet living rooms. You don’t renovate homes to your taste; you renovate to market. It’s about speed & doing the work that brings the best return on investment. To make a profit you have to suppose your material & labor costs inside & out. You have to get the right financing locked in & stay on your timeline or you will lose your shirt. You have to suppose these things before you start, and construction, on the other hand, is something you’re going to easily have to learn on the task. You can do some of the work yourself however having reliable professionals to task in will save you time & money in the long run. Case in point is your Heating & Air Conditioning set up. Your apartment needs the heat & air handling in perfect easily working order so you don’t get flagged on the appraisal. If you haven’t properly located your vents & ductwork with forced air units, you’ll run into big trouble. Appraisers always take photos of the gas furnace & vents. So, don’t even attempt to do Heating & Air Conditioning yourself. The cost of having a certified Heating & Air Conditioning installer do the work in a short, guaranteed time frame will keep your margins in line; Just make sure your construction team doesn’t make a mess of the Heating & Air Conditioning work. I’ve seen day laborers cause damage with drywall dust & airborne debris to Heating & Air Conditioning systems that would make you cry. I once had a gas furnace blower fan that got caked in drywall dust. That meant that the evaporator core for the cooling system was also caked in drywall dust. I had major cost overruns from having it all professionally cleaned.