| Project Size | Installation Time | Notes |
|---|---|---|
| 1 window (standard size) | 30 min – 2 hours | Longer if trim work needed |
| 5–10 windows | 1 full day | Typical crew of 2–3 |
| 10–20 windows | 1–2 days | May depend on home layout |
| Whole house (20+ windows) | 2–3 days | Bay/bow windows add time |
| Bay or bow window | 4–8 hours per unit | Structural work may extend this |
These are installation timelines — time from crew arrival to completion. The full project timeline from first contractor contact to finished installation is longer: account for quote collection (1–2 weeks), permit issuance (1–4 weeks in most markets), and product lead time before installation day arrives.
The most common delay is special-order windows for non-standard sizes. Older homes often have openings that don't match standard window dimensions. Custom or special-order windows from major manufacturers typically run 4 to 8 weeks from order to delivery. During peak season (spring and summer), lead times can extend to 10–12 weeks for some manufacturers.
Rotted or damaged framing discovered during removal is another common delay driver. If an installer removes an old window and finds water-damaged framing lumber, that structural repair must happen before the new window goes in. This adds 1–2 days and additional cost.
Window replacement usually needs a permit, and more reliably so when you change the window size, alter a structural opening, or are in a coastal or high-wind zone. Confirm with your local building department. Permit processing time varies a great deal between municipalities, and we have no authoritative source that covers them all — ask your building department what to expect before you schedule work. Always ask your contractor to confirm permit requirements for your specific project and jurisdiction before scheduling installation.
Yes — window replacement is not a disruptive enough project to require vacating. Contractors work one section of the home at a time, and each window opening is typically exposed for only 15 to 30 minutes. Expect noise and some dust. In cold weather, the crew will work quickly to minimize heat loss, and any temporarily exposed openings can be covered with plastic sheeting between installations.
Standard stocked windows (common sizes in vinyl) from major distributors can sometimes be sourced in 1–2 weeks. But most contractors order windows specifically for your project, and lead times of 3–6 weeks are typical for mid-range products. Premium brands (Andersen, Pella, Marvin) and any custom configurations run 6–10 weeks. Ask your contractor for the specific lead time at the time of order, not at the time of quote.
Ask specifically: What is the lead time on these windows from the date of order? When will you pull the permit and how long does that typically take in this jurisdiction? How many windows will your crew complete per day? What happens if you find rotted framing during removal? Getting clear answers to these questions prevents the common frustration of a project that was quoted as a one-day job stretching into weeks.
Plan on 6-10 weeks total from your first call to a finished whole-house job. Most of that is lead time on the windows themselves, not install day, so add a few weeks if you're going custom sizes.
These are the questions homeowners ask most often before starting this project - what it costs, how long it takes, what a fair quote looks like and which details change the price. Each answer below is written to stand on its own, so you can read just the one you need.
