How Much Does It Cost to Replace 5, 10, 15, 20, or 25 Windows?

The cost to replace windows scales with quantity, but not in a straight line. Replacing 10 windows does not cost exactly twice as much as replacing 5, because larger projects unlock bulk discounts of 10-20%. Below you will find cost tables for every common project size -- 5, 8, 10, 12, 15, 20, 25, and 30 windows -- broken out by frame material.

The average window replacement cost in 2026 is $450 to $1,200 per window installed. Your actual cost depends on the frame material, window style, glass type, and your location. Use our window replacement cost calculator to get a personalized estimate for your exact window count.

Quick Cost Reference: All Project Sizes

Costs include materials and professional installation. Ranges reflect standard double-hung and casement windows with double-pane Low-E glass. Specialty windows like bay or egress windows cost more.

Bulk discount note: Projects of 10+ windows typically qualify for 10-15% volume discounts. Projects of 20+ windows may receive 15-20% off. The ranges above do not include bulk discounts, so your actual quote may come in lower for larger projects.

Cost to Replace 5 Windows

Five windows is a small project, often covering just one floor or one side of a house. At this size, you are unlikely to get volume discounts, and some contractors charge a minimum trip fee that raises your effective per-window cost. If you are only doing 5 windows, consider whether it makes sense to wait and do more at once to unlock bulk pricing.

Cost to Replace 8 Windows

Eight windows is close to the average number of windows in a smaller home. This project size is the threshold where some contractors start offering modest volume discounts (5-10%). An 8-window vinyl project with standard double-hung windows is a solid one-day job for most crews.

Cost to Replace 10 Windows

Ten windows is the most commonly quoted project size and the benchmark used in industry reports. The 2025 Cost vs. Value Report prices a 10-window vinyl project at $20,091 (using premium-tier vinyl with professional installation through a dealer network -- your actual cost with mid-range vinyl will likely be lower). At 10 windows, expect volume discounts of 10-15% from most contractors.

A 10-window project typically takes 1-2 days of installation time.

Cost to Replace 12 Windows

Twelve windows represents a typical mid-sized home. This project size puts you solidly in the range where bulk pricing kicks in. Most contractors will offer 10-15% off their per-window price for a 12-unit project.

Cost to Replace 15 Windows

Fifteen windows is a common count for a standard two-story home. At this scale, installation typically takes 2-3 days. Volume discounts of 10-15% are standard. If you are financing the project, many window companies offer promotional financing on projects of this size.

For detailed budgeting on full-house projects, see our whole house window replacement cost guide.

Cost to Replace 20 Windows

Twenty windows is a large home or a home with generous window coverage. At this project size, you should be negotiating 15-20% volume discounts. Consider a phased approach if the upfront cost is challenging -- do the most visible or worst-performing windows first, then complete the rest within 6-12 months.

Installation for 20 windows takes 3-4 days for a two-person crew.

Cost to Replace 25 Windows

Twenty-five windows is a large project that puts you in a strong negotiating position. Push for 15-20% off list price, and ask about free upgrades (Low-E coating, argon fill) as part of the deal. At this volume, some manufacturers will also offer extended warranty terms.

Cost to Replace 30 Windows

Thirty windows is a major whole-house project for a large home. At this scale, expect 15-20% volume discounts and the ability to negotiate favorable terms. Installation takes a full week (4-5 days). A phased approach can spread the cost over two budget cycles while still capturing most of the volume discount if you commit to the full project upfront.

How to Get the Best Price by Window Count

Volume Discounts

Most window contractors and dealers offer volume pricing that reduces your per-window cost as the quantity increases.

Other Ways to Save

• Schedule off-season. Late fall and winter installations can save an additional 10-20% because contractors are less busy. See our full guide on how to save money on window replacement.
• Mix window types strategically. Use premium windows (fiberglass, triple-pane) for main living areas and budget options (vinyl, double-pane) for bedrooms and bathrooms.
• Get at least three quotes. Pricing varies significantly between contractors, especially for larger projects.
• Ask about financing. Many window companies offer 0% financing for 12-24 months on projects above a certain dollar threshold.

Should You Replace All Windows at Once?

Replacing all your windows in a single project saves money compared to doing them in stages. You lock in volume discounts, the crew mobilizes once instead of multiple times, and your entire home gets a uniform look and performance upgrade.

That said, the upfront cost of a whole-house project can be substantial. If your budget does not allow a complete replacement, prioritize:

1. The worst-performing windows first -- old single-pane windows, windows with failed seals, windows you can feel drafts through
2. The most visible windows -- front-facing windows that affect curb appeal
3. The rooms you use most -- living room, kitchen, master bedroom

For more on the financial case for full replacement, see our window replacement ROI guide.

Get Your Window Replacement Estimate

Use our window replacement cost calculator to price out your specific project by quantity, material, and location.