Planning of each stage in the beginning is a very important.
Planning of the windows and doors, the electrical, the HVAC, the kitchen layout and virtually everything.
Once the structure has been framed, sheathed and roofed, it is best to meet with the electrician, plumber, mechanical contractor and the kitchen and bath designer.
The kitchen and bath designer will draw on the walls and floors the layouts of the kitchen and bathrooms including pipe centers, wiring locations and cabinets.
The electrician will mark on the floor and studs the locations of switches, outlets and lighting fixtures.
The plumber will mark on the walls and floors where water lines will enter the floor system, toilet locations, tub locations and drain line locations.
The mechanical contractor will mark on the walls and floors where their thermostats will go, where their registers (vents ) will be placed and their return locations.
Return locations are for the intake air of the home to duct to the air handler.
This requires some thought as the area needed is generally large.
With all trades having marked the locations of their runs it will allow you to see any future complications that may arise and eleviate any complications before they become costly to remedy.
In practicing these few simple suggestions there is no reason that the interior of your home will be a sure success.
Some get very carried away and schedule subcontractors immediately to "just do it" and generally will result in some complication or another.
Time, efficiency and the overall Product are the most important things when efficiently building a home.
Take a day, breathe and just do it right.