Replacing your windows is an exciting home improvement project, but if you’ve never gone through the process before, you may be wondering what installation day actually looks like. How much preparation is required? Will installers need access to every room? How long will your home be exposed to the outdoors?
Knowing what to expect can make the entire experience easier.
At Midwest Windows, Siding & Doors, we help homeowners throughout Chicago and the surrounding suburbs upgrade their homes with professionally installed replacement windows. Here’s what homeowners can generally expect before, during, and after window replacement day.
Before the Installers Arrive
A little preparation can help your installation crew work efficiently and protect belongings around the work areas.
Before installation day, consider:
- Removing curtains, blinds, and other window treatments
- Moving furniture away from the windows being replaced
- Removing decorations and fragile items from nearby shelves and walls
- Clearing exterior access around the windows when possible
- Making arrangements for pets that could interfere with the work area
- Confirming that installers can easily access the necessary rooms
You don’t need to completely empty each room. The goal is simply to provide enough space around each window for the installation team to work safely.
What Happens to Your Existing Windows?

Installation typically begins with carefully removing the existing window.
The exact process depends on the type of window, its condition, and how it was originally installed. Once the old window is removed, the installer can inspect the opening and prepare it for the replacement unit.
This part of the process matters more than many homeowners realize. A high-quality replacement window can only perform as intended when the opening is properly prepared and the new unit is correctly installed.
Will Your House Be Open to the Outdoors?
This is a common concern, particularly for Chicago-area homeowners dealing with changing temperatures.
Professional installers generally work systematically rather than removing every window in the house at once. An existing window is removed, the opening is prepared, and the replacement is installed before the crew progresses through the project.
This helps minimize how long individual openings are exposed.
Weather conditions can also affect installation plans, which is one reason scheduling and preparation are important.
Installing and Securing the New Window
Once the opening is ready, the replacement window is positioned and checked carefully.
Proper positioning is essential. The window needs to sit correctly within the opening so it operates smoothly and seals effectively.
Installers may check that the window is:
- Level and properly aligned
- Square within the opening
- Opening and closing correctly
- Locking properly
- Securely fastened
- Properly sealed around the opening
These details can have a significant impact on the long-term performance of your windows.
Insulation and Sealing Matter
Window replacement isn’t simply a matter of putting a new window into an old opening.
The areas surrounding the window also need attention.
Proper insulation and sealing help reduce unwanted air infiltration and protect against moisture. This is especially important in the Chicago area, where windows must perform through hot summers, freezing winters, wind, rain, and significant seasonal temperature changes.
Poor installation can undermine many of the benefits homeowners expect from new windows, which is why professional installation is such an important part of the replacement process.
What About Interior and Exterior Finishing?
After the window itself has been installed, finishing work may be completed around the interior and exterior of the opening as needed.
The exact work depends on the home, window type, existing trim, and project scope.
The goal is for the finished installation to look intentional and complement the surrounding area rather than simply appearing as though a new window was inserted into an old opening.
How Long Does Window Replacement Take?
There isn’t one universal installation timeline.
The amount of time required can depend on:
- Number of windows being replaced
- Window sizes and styles
- Accessibility
- Condition of the existing openings
- Necessary preparation or finishing work
- Weather conditions
- Complexity of the installation
A smaller project may be completed relatively quickly, while a larger whole-home replacement naturally requires more time.
Your window professional should discuss the anticipated project schedule with you before installation begins.
What Should You Check After Installation?
Once the work is complete, take some time to look over your new windows and understand how they operate.
Check that windows:
- Open and close smoothly
- Lock properly
- Sit correctly within their openings
- Have clean, finished edges
- Don’t show obvious gaps around the installation
This is also a good opportunity to ask questions about operation, cleaning, maintenance, screens, warranties, or anything else you need to know about your new windows.
What Happens to the Old Windows?
Removal and cleanup procedures can vary depending on the contractor and project agreement, so homeowners should confirm what’s included before installation day.
A professional installation process should also leave the work areas reasonably clean and free of installation debris once the project is finished.
Preparing for a Smoother Installation Day
The easiest window replacement projects are usually the ones where homeowners and installers know what to expect before work begins.
Clear access to the windows, remove nearby belongings, keep pets safely away from work areas, and ask questions ahead of time if you’re uncertain about anything.
Most importantly, remember that the quality of the installation matters just as much as the quality of the window itself.
Planning to Replace Your Windows?
If your home’s windows are drafty, difficult to operate, damaged, or simply reaching the end of their useful life, Midwest Windows, Siding & Doors can help you explore your replacement options.
Our team serves homeowners throughout Chicago and the surrounding suburbs and can help you choose replacement windows suited to your home, priorities, and local climate.
Contact Midwest Windows, Siding & Doors today to schedule a free estimate and learn more about replacing your home’s windows.






