Estimating costs for home systems like HVAC, electrical, and plumbing requires understanding the two main categories of work: rough-in and finish work.

Rough-in work involves the core components of these systems, such as electrical panels, furnaces, AC units, water heaters, and the associated wiring, piping, and ductwork hidden behind walls and ceilings. Estimating rough-in work can be challenging due to project-specific factors and local building codes. It's advisable to consult with local professionals and contractors for accurate pricing and to ensure compliance with regulations.

Finish work involves the visible elements of these systems, such as light fixtures, faucets, showerheads, tubs, and toilets. Estimating finish work is generally easier since the work is more predictable and material costs for fixtures are readily available online or at home improvement stores.

By understanding the distinction between rough-in and finish work, you can approach your systems estimations with greater clarity and confidence.