Given the fixed load of this type of work, you can save labor by replacing more windows instead of one window at a time. That said, 80% of homeowners opt for vinyl replacement windows because of the relatively low overall cost of vinyl compared to fiberglass and especially wood framed windows. You may be surprised by all the available local window rebates and credits that will help you recover money on your window replacement project. Depending on how long you live there, the energy savings can offset the price of window replacement.
Here's a quick breakdown of several factors that affect the cost of energy-efficient windows and what you can expect to pay for each. However, the number of window panes, along with the energy efficiency considerations of the windows (low-E glass, argon gas filling) and the durability and longevity of the window frame material are important factors to consider when evaluating the replacement costs of the different options. The basic materials for window replacement are window (of course), wooden wedges, casing nails, insulation material (optional) (usually fiberglass) and putty, and labor warranty. For example, the cost of replacing a window in Austin, Texas, may be more expensive in terms of labor compared to a small Texas town with many local window installers offering affordable rates.
In addition to the cost of window replacement, you may have to pay for structural repairs, waterproofing, insulation, cleaning, and removal. Compare that to the labor of replacing a small bathroom window, and it's easy to understand why window sizes affect labor fees. It is much cheaper to replace the glass in a window instead of the entire wooden frame plus the glass, which must be done if the frames rot or warp. While replacing windows is usually simple, it's not uncommon to encounter additional costs during the course of the project.
The caveat of looking for lower cost in a package is that you are restricted by the types of products the vendor offers, and you could end up with windows you love and doors you like less. In general, the larger the window, the more expensive the replacement will be due to all the additional materials and labor involved. Keep in mind that installation costs (professional labor only) to install wood framed windows can be between 50% and 100% higher compared to vinyl because wood framed windows take longer to install, as they generally involve more labor.