Over the years, window design and construction has improved gradually in efforts to cut down on energy costs.

Specifically, landlords are increasingly phasing out older aluminum doors and single-paned aluminum windows. This is because they easily conduct cold and heat and are therefore less energy efficient.

In addition, older systems have a tendency to form condensation and sometimes molds when the ventilation is poor.

Window replacement, depending on the age of your neighborhood, can serve different functions such as to eliminate maintenance, for easier function, and for better energy efficiency.

When it comes to window replacement, many people usually relate them to residential single-family homes. Recently, however, there has been a growing trend for multi-family properties to replace their windows as well.

Are you a rental property owner? If so, here are windows replacement trends you should know about. This list is provided by Kellie from T-Square Real Estate Services, who spent many years working in real estate and property management.

Block-Frame Windows

  Blocked-frame windows are a non- finned window frame. This means, they have neither a nail-on flange nor a z-bar flange. They are designed to replace windows on homes with siding or brick exteriors.

Flush-Fin or Z-Bar Windows

Flush-fin or z-bar windows are standard replacements for windows with aluminum window frames. They feature a flange that protrudes from the frame.

The retrofit flange provides a clean look to the exterior. In addition, it also insulates the interior of the home with proper sealing.

Installing flush-fin or z-bar windows is relatively quicker and less expensive. They are measured to fit in the existing window opening and therefore the contractor doesn’t need to remove the home’s exterior materials. This saves on labor and time costs.

Nail-On Framed Windows


Nail-on windows are typically used in three circumstances:


  • When you want to remove an existing window completely;
  • When doing an addition to the home;
  • Or, when building a new home.


Unlike a Flush-Fin or Z-Bar replacement window, a nail-on framed window tends to be more expensive. This is because the installation procedures are a bit longer.