Window Installation Cost Calculator

Last Updated: Aug 18, 2025

Are you planning a new window installation but wondering how much it will cost? No worries, in this guide explains how you can estimate the cost of a new window installation based on your scenario. We also explain the formula behind the calculator and include a real-world example.

In this guide we cover:

  • What is a Window Installation Cost Calculator?
  • How Window Installation Cost Is Calculated?
  • A real-world example
A worker is installing a new window

What is a Window Installation Cost Calculator?

A Window Installation Cost Calculator is a free online tool that helps you estimate the cost of installing windows. The calculator requires inputs such as the number of windows, window style, frame material, installation complexity, location, and whether to remove old windows to estimate the total window installation cost.

Next, we take a look at how the window installation cost is calculated.

How Window Installation Cost Is Calculated — Example

The calculator uses simple logic for cost estimation. Let’s take a look at a real-world example:

Imagine this scenario:

  • Number of windows: 6
  • Window style: Double-hung
  • Frame: vinyl
  • Complexity: moderate
  • Location: suburban
  • Remove old windows: No
  • Trim & finish: None

Perform the calculation:

  • Unit material = $391 × 1.00 = $391
  • Materials = 6 × $391 = $2,346
  • Labor = 6 × ($180 × 1.00 × 1.00) = $1,080
  • Supplies (5%) = $117.30
  • Subtotal = $3,543.30
  • Contingency (10%) = $354.33

Total = $3,897.63Per window = $649.61

Tips to Help You Reduce Installation Costs

  • Choose a lower-cost material such as vinyl (good thermal performance for the price).
  • Install all windows at once to lower the per-unit labor cost.
  • Custom sizes increase cost, so avoid them; choose standard sizes to keep costs down.
  • If you are replacing windows, do minor trim yourself (DIY) instead of paying for it.
  • Get multiple quotes to compare and choose the most cost-effective option.

Frequently Asked Questions

Why is there a contingency charge?

Contingency, set at 10%, is used as a safety buffer to cover unexpected or hidden issues that may occur during installation, such as rot or additional framing.