1.  Wainscoting

Wainscoting in a home's mudroomImage: Elissa Toews

Wainscoting bestows textured detail and rich visual interest to an otherwise bland wall, but its origins are much more practical: adding insulation.

In 18th-century homes, pre-industrial stone walls tended to be cool and damp. Wood wainscoting absorbed heat and kept drafty rooms cozy. Today’s modern insulation means wainscoting isn’t necessary to warm up your room, but it does provides another benefit: protecting your plaster walls from dings and dents, especially in high-traffic areas like hallways, mudrooms, and tightly packed dining rooms.

Related: Avoid the No. 1 Mistake Most Homeowners Make When Installing Chair Rails

2.  Bay Windows

Bay window in a breakfast roomImage: Hibbs Homes, LLC

Sure, bay windows transform an average room into a visual masterpiece. But their unique design also helps to modulate that room’s temperature and airflow. Open the windows on all sides to ventilate your space with breezes from multiple directions — ideal for airing out a stuffy winter bedroom or cooling down on a sticky summer day.

We’ll even contend that bay windows can cheer you up: Their extra window surface area — sometimes complete with a reading bench — invites more sunlight into your home. And evidence indicates sunlight makes you happier.

Related: The Joys (Emotional and Financial) of Daylighting

3.  Parapets

Parapet wall on a Spanish-style homeImage: Liz Foreman for HouseLogic

Originally designed to fend off intruders, parapets have found a new purpose in peaceful society: keeping a roof over your head in high winds. These small walls, commonly found bordering flat terraces or roofs, can prevent pressure from building up at your home’s upper perimeter that possibly — in the right (terrible) circumstances — could “suck roofs off buildings,” according to an article in “Building Science Insights.”

So while you might think your parapet is just ornamental, it’s actually preventing you from having a real-life “Wizard of Oz” moment. (Well, probably not — but don’t they look amazing paired with beautiful molding?)

4.  Dormers

Dormer window on a houseImage: Liz Foreman for HouseLogic

The little windows sticking out from a roof are far from just decorative: Not only do they break up a flat expanse of shingles visually, but they also provide ventilation and light to an attic or upstairs living space. Best of all? Because they push out from a room, dormers drastically increase the livable space inside by forming an alcove or nook, potentially turning a drafty old attic into a sunny, cheerful bedroom.

Other options for adding space to your loft might involve raising the roof or lowering the ceiling height of your main floor, but dormers are a far more affordable — and adorable — solution to your small space problems.

Related: Classy Architectural Details for Your Home’s Interior