I could go without a line upgrade if only one tankless unit of this type was installed.My question is this: should I size the system to support 100% usage on every hot water fixture in the building, knowing that it will probably never be used, or is 70-75% usage from a single heater going to be alright? 

My contractor threw on a new layer of paint throughout entire house, replaced carpet with hardwood laminate, restored the wood on the staircase, and refinished tub/vanity in bathroom, new blinds and fixtures.

Pressure wash deck, house and wheelchair rampPaint deck, wheelchair ramp and wood floor of screened in front porchReplace screen on screen door (front porch)Replace 2nd screen door (front porch)Replace 2 ceiling fansPossibly paint cabinets (depending on how they look after cleaning)Replace vinyl flooring in guest bath (planning to use vinyl tile)Replace guest bath vanity topPossibly replace vinyl flooring in master bath (vinyl tile)The good news:Furnace, AC unit and hot water heater are all relatively new (~4 years old).Deck is solidBrushed nickel fixtures from the previous rehab are still in great shape.Refrigerator appears to be in working condition, as is over-the-range microwave.  

I'd like to source my own fixtures (vintage/ salvaged/ thrifted) and do some of the work myself/ w friends who are handy.  

I am not talking about that burglarized stuff my guy (I call him my guy)picks up lighting blinds and faucets from home depot they are on pallets so some stuff is not usable others can be mixed and matched to make a complete set.everthing from floor lamps to sconces to ceiling fans the draw back is that they dont always have matching pairs and setsso you have to think theme as opposed to sets.check out craigslist the other place in atlanta sells a combination of new in the box european fixtures for a 1/3 of the cost as well as stuff that looks like it was stolen out of a foreclosurehe is huge and is only open on sat and wednesdaykeep looking rob

Very slow, lose the order, get it wrong, take forever...YMMV.Something to remember: If you're replacing windows be sure to double check the need for tempered glass near doors, bath fixtures, etc... easy mistake to make.

Not my cup of tea.

Replace light fixture.3 upper level bedrooms.  

.- Change all kitchen / bath, garage and outside outlets to GFCI, depending on jurisdiction sometimes we change to separate circuit on Arc Fault breakers- Move Microwave to separate circuit- Add hardwired smoke / carbon detectors to code- Add Air hammer arrestors to fridge, D/W, Laundry- If replacing windows, ensure all new windows meet egress.Well be wrapping up tile, flooring, and swapping out the light fixtures next couple days!

I still do the stuff that it is silly for me to pay someone E.g. ceiling fans, light fixtures, door HW, landscaping, etc.