Size and placement of windows affects the character and curb appeal of the home from the outside, and light, views, energy efficiency, air flow, noise and egress from the inside. Done right, windows can make your home everything you would want it to be. Windows that are inadequate can be a headache and an expensive fix.
When examining windows, look at the frames and how they are built into the wall. Understand the materials used and how the window functions. Windows should open and close easily and completely, and have the ability to be secured with a lock. Signs of moisture around the window should be addressed, to ensure that there are no leaks.
Examine the type of material in the window frame. All-vinyl windows generally cannot be painted, and other, older wood framed windows might have so much paint on them that they are difficult to open. While you are looking at the window frames, notice how the windows open, and whether the glass is single, double, or even triple-paned. Depending on your climate, double or triple-glazed windows can make a huge difference on your heating and cooling bill. Gas-filled windows use argon, krypton or other inert gases to fill the areas between the panes, further enhancing the insulating factor. Excellent windows also help to deaden noise from the outside, which can be helpful in urban environments.
Don't forget to examine the state of any screens. Windows that open in climates that are prone to bugs should have tightly fitting screens that are not full of holes. Doors that open to decks might have screens, and some may be fitted with glass to convert to storm doors in the cold and rainy seasons.
Additionally, windows should match the style of the home. Older homes with fine detailing throughout should have windows that make sense with the other materials and stylistic features in the home. Research window styles and look at comparable homes in your area to see what other homeowners have done. Outfitting a home with the wrong windows can be as big a mistake as hiring a poor installer.
Viewing the home from both the inside and out, at various times of the day, and noticing the windows close-up and from afar, their views to the inside and outside, will enable you do understand the home in a new way—shedding light on the home itself.