I didn't think my kitchen was all that complex, but I did have to rebuild basically everything, including new framing because the old framing was done completely wrong. I had joists sitting on raw brick and no sill plate.

New electric, though some were already ran to the kitchen. Replaced the wire with correct guages for circuit (had some 10ga wire running on an outdoor light and a 15a circuit) added GFCIs and properly routed them with nail plates. Had to fix a bootleg ground that stopped GFCIs from operating properly.

New gas line, moved it to the other side of the kitchen. This also fixed what i consider poor workmanship on the previous clusterfuck that was the gas line, redid the sink fittings after cutting down the old copper, ran a pex through the wall for an icemaker box.

Didn't move HVAC but did install a duct for the range hood which required knocking out and replacing some bricks.

Had to build new framing, as well as build an exterior wall to utilize and support the roof. Old build had the roof in a sorta awning configuration, but it was only supported on that side by a very old, and obviously rotting stud. Doing this allowed me to change the kitchen and gain a few square feet.

Speaking of framing, installed new structural walls with studs every 12" (over the top, I know) because the brick wall that was supporting the ceiling did not have a sill plate, so the joists were resting on brick and were beginning to show signs of decay. Also, one of the joists was literally .25" from falling off the bricks because of settlement issues.

Fixed 3 different roof leaks caused by improper flashing on the roof where it meets existing neighbors structure. They used clear silicone. It cracked and leaked. Added a bucket of blackjack and mesh tape so should last a few more years.

Floor was more than 2" off level due to settlement. Went into crawlspace to support floor from underneath by building yet another wall in the crawlspace. Wasn't necessary but it made me feel better. Then leveled the floor using 21/32 OSB with tongue and groove and a series of shims, finished up with 2 bags of self leveling cement.

Replaced windows, which had rotting framing, with new pressure treated frames and flashing tape. Still need to add exterior moulding.

Cabinets were then ordered, and I assembled them myself. Got from Washington Avenue. Countertops were ikea. Did subway tile and black grout.

Had a contractor neighbor who came through every couple of days to help with bigger stuff like putting drywall on the ceiling. He also was the one who installed the cabinets. Borrowed a lot of tools from him. He also made sure I was doing things correctly, and was extremely helpful when I had questions or needed solutions to problems.