Some of our major expenditures off the top of my head:Plumbing: 24kHVAC: 12kRoof: 6k (flat roof TPO)Floors: 9k (refinished most, replaced the master bedroom)Electrical: 12kDemo: 6.5kConcrete/Fence/Landscaping: 14.5kWindows: 7kTuckpointing: ~6k (if you don't know what that is, it's brick work basically)Architect: 2.5kCabinets and countertops (kitchen): 9kFraming: 9kDrywall: 13kPaint: 4k (paid someone to help so it wasn't just me)Doors: 5k (lots of doors including 4 exterior)Appliances: 2.5kStaging: 2kThe other 20k or so went to Vanities, trim (we used good 7" trim board that matched the original trim), waterproofing, permits, finishes etc... 

Office space is going to be fat that gets trimmed to help keep companies afloat.

I acted as my own general contractor (with a few subs), relocated the stairs to create open living area, replaced the kitchen, got rid of all the honey-oak trim and doors, and converted part of the huge 55-foot deep garage into two more bedrooms + additional full bath. 

., it saves us a ton, we get to inspect our properties and "check in" with them so we are familiar once again, and see things tenants and managers never catch, like rotting trim or deck boards, most recently a small active roof leak, that usually won't get noticed until it becomes a major issue.      

Long story short, copper piping replaced with 40 feet of pex piping, two feet of drywall/insulation removed from 3 out of 4 walls in two bedrooms (where we discovered more nails that were put into section of piping from when previous owners installed trim during a reno), and things have been progressing.

No...the lender begins to pick apart the work that was completed by a licensed HVAC tech and the handyman that capped and painted the windows...then they note an 18" piece of trim on an exterior door that may have peeling paint...not in the appraisers report!

Some very rough numbers may look like this,  roof and gutters 10k, bath/floor 7k, kitchen 10k, paint patch 7k, floors 3k, windows 2.5k, hvac 7k (central air and furnace), electric  trim, lights 1 k, doors $200a piece (door and  hardware),  water heater and plumbing (excluding bath and kitchen above) $1,800, driveway ($10/sf for concrete), ceiling at basement $800,  demo $1000, electric,  water,  taxes,  holding costs,  etc .

For example some electrical stopped working in the house after I had paid thencontractors electrician at the time of construction to make sure all electricals were up to date to prevent such things from happening, we fixed that.. after that we noticed some leaking in a part of the home which we finally located the problem that the the contractor nailed trim with a nail gun and made a hole in a heating pipe which dripped slowly so no one knew anything until the damages were big, we fixed that.

There's tons of way to trim spending and those dollars saved can be directed into investments.

We typically see things come in around-basic level rehabs (kitchens, bathrooms, flooring, paint, some minor wall patching) around $30 per sq-ft-mid level (same as above but with possible roof, siding, major system upgrades, ect) at $50 per sq-ft-full rehab including above but with framing, foundation, new insulation, new drywall, doors, trim, ect around $75 per sq-ft- rebuild, additions, add a level, ect $125 per footThere is no one size fits all and no two rehabs ever go exactly the same, there are always unforeseen things you find once you start working, but that should give you a ballpark.