Upgrading your home with new windows is an exciting endeavor, but the process can be intricate. Proper window installation ensures your home’s energy efficiency, functionality, and aesthetics. With many options and techniques, navigating the window `world can feel overwhelming. That’s why we prepared a guide to walk you through the process. You’ll learn the difference between new construction and replacement windows, how to take the measurements correctly, and how to prepare your home for installation day. Let’s begin!

New Construction Windows and Replacement Windows – which one do you need for your project?

Both types have unique features, and determining the right choice for your project will depend on your specific needs and circumstances. As a new buyer, understanding these differences will help you make an informed decision that best suits your project’s requirements.

New Construction Windows: designed to be installed in homes that are being built from the ground up or undergoing significant renovations. These windows come with a nailing fin, a rim that allows them to be nailed directly to the house’s framing. This installation creates a secure, weather-tight connection between the window and the home’s structure. Since new construction windows are typically installed before the exterior siding, they offer more flexibility in terms of size, shape, and style.

Replacement Windows: also known as retrofit windows are specifically designed for existing homes that need window upgrades without altering the surrounding structure. These windows are installed within the existing opening, meaning the exterior siding and interior trim remain intact. Replacement windows do not have a nailing fin, as they are secured in place using brackets or fasteners. This type of window is ideal for homeowners who want to improve energy efficiency, functionality, and aesthetics without requiring extensive construction work.

Measurements – how to measure and order windows

Now that you’ve identified the type of windows best suited for your project, the next step toward a seamless window installation is getting accurate measurements. This ensures you can order the right-sized windows for a perfect fit.

Measuring the window

For this step, you only need a tape measure, a pen or pencil, and a notepad to record the measurements. We advise you to double-check all the records before placing an order with the manufacturer. Let’s begin!

Measure the width:

  • Take three measurements from the inside: top, middle, and bottom
  • Record the smallest measurement as window width

Measure the height:

  • Take three measurements from the inside: left side, center, and right side
  • Record the smallest measurement as window height

Measure the depth:

  • Check the depth from the inside surface of the frame to the outside surface
  • Ensure consistent depth and meet the minimum required depth for replacement window

Remember – to review and verify accuracy! A measurement that’s off by even a fraction of an inch could lead to significant problems. That’s why we highly recommend using the services of a professional or contractor that will understand the window system and its design and your work environment.

Window installation process – what to expect from your contractor

Knowing what to expect and preparing for window installation can make working with a contractor a stress-free experience. It’s important to begin by selecting a reputable contractor who has experience in window installation, especially if you’re considering a specific window line such as OKNOPLAST PAVA, PIXEL, or WINERGETIC and require installation services. A contractor should have a deep understanding of the system that will be installed, which is why you may want to consider hiring one recommended by the manufacturer. You should discuss your project in detail with the contractor, including your preferred window type, budget, and timeline. Before the installation day, it’s important to clear the area around your windows, both inside and outside, to ensure a safe and efficient workspace for the contractor.


Remove any window treatments, furniture, and other obstructions that may hinder the process. On the installation day, the contractor will typically start by removing the old windows and preparing the opening for the new ones. They will install the new windows, ensuring proper insulation, sealing, and alignment. Finally, the contractor will clean up the work area and dispose of the old windows, leaving your home with a fresh, updated look. Remember to ask questions or address your concerns throughout the process to ensure a smooth and successful window installation experience.

Get a personal consultation.

For all questions, problems, and suggestions find an OKNOPLAST expert near you and ask for a quote.