How a siding replacement job actually goes
A siding replacement follows a clear order. The crew first strips the old siding down to the sheathing. They inspect the exposed wall for rot, water damage, and soft spots. Any bad sheathing gets repaired or replaced before anything new goes on. This step is where hidden problems surface, so an honest crew slows down here.
Next comes the weather barrier. The crew wraps the walls in house wrap, a water-resistant barrier that sheds moisture. They add flashing around every window, door, and corner. Only then does the new siding go up, course by course, from the bottom. Trim, caulk, and final flashing finish the job and seal the edges.
Timeline depends on the home size, the material, and the weather. A typical single-story home takes several days to about a week. A large or multi-story home, or one that needs sheathing repair, takes longer. Rain stops work, since the walls cannot sit open in a storm. Ask your contractor for a realistic schedule before the crew arrives.
What really moves your price
Material choice is the biggest lever. Vinyl sits at the low end and installs fast. Engineered wood and fiber-cement land in the middle to upper range and cost more to handle. The calculator above lets you compare materials side by side. Your wall square footage then multiplies that per-foot difference across the whole house.
Wall area drives the rest of the price. Crews measure the total square footage of wall surface, not the floor plan. A larger home, or one with tall walls and many gables, has more surface to cover. More surface means more material and more labor. Windows, doors, and corners add cutting and trim work that a plain wall does not.
Several add-ons raise the total. Removing and hauling the old siding takes labor and disposal. Repairing rotted sheathing adds material and time once the wall is open. Adding foam board insulation under the new siding costs more but improves the wall. Extra stories and tight access slow the crew and raise labor. Detailed trim and flashing around openings add to both.
House wrap, flashing, and permits
House wrap is not optional, even though it hides behind the siding. This weather-resistant barrier lets the wall shed water that slips past the siding. It also lets trapped moisture escape, so the sheathing stays dry. Siding alone is not waterproof. Without the wrap, wind-driven rain reaches the wood and starts the slow rot that ruins a wall.
Flashing protects the weak points. Crews install metal or membrane flashing above windows, above doors, and at every wall transition. These are the exact spots where water tries to get in. Correct flashing directs that water back out and over the siding below. Skipping or sloppy flashing is a leading cause of leaks and hidden rot behind new siding.
Most siding jobs need a permit. Your city or county usually requires one to replace siding, and an inspector may check the work. The permit confirms the wrap, flashing, and any insulation meet code. A contractor who pulls the permit stands behind the job. One who skips it to save time leaves the risk and the liability with you.
How to hire and vet the contractor
Start with the license and insurance. Confirm the contractor holds the license your area requires. Ask for proof of liability coverage and workers compensation. Siding work happens on ladders and scaffolding, so coverage protects you if a worker is hurt. A contractor who cannot show current documents is a contractor to pass on.
Insist on an itemized bid. A good bid lists the material, the square footage, old-siding removal, house wrap, flashing, trim, and cleanup. It should state clearly that the wrap and flashing are included. A single lump sum hides what you are buying. Compare itemized bids line by line, not just the bottom number, so you compare the same scope.
Check the track record before you sign. Ask for recent local references and, if you can, look at a finished job in person. Read the warranty on both the material and the labor, and learn who honors each one. A manufacturer warranty covers the siding, and a workmanship warranty covers the install. Get every promise in writing.
Red flags and ways to avoid overpaying
The worst red flag is siding installed over rot. A crew that covers soft sheathing to save a day is hiding a problem that will spread. The same goes for skipping the house wrap or the flashing around openings. These shortcuts are invisible on day one and expensive years later. Ask directly how they handle bad sheathing and confirm the wrap and flashing.
Watch the paperwork and the bid. A contractor who wants to skip the permit is avoiding inspection for a reason. A vague per-square price with no scope leaves room to cut corners or add charges later. Push for an itemized bid that names the wrap, the flashing, and the removal. Clarity up front is your best protection against a surprise bill.
Be wary of pressure, especially after a storm. Storm-chasers knock on doors, warn of urgent damage, and push you to sign fast. A real contractor gives you time and a written bid. Do not pay a large deposit up front, and never pay in full before the work is done. Get at least a few bids and choose on scope and reputation, not on a countdown.