What is a dormer?

Learn more about dormer windows, including pros, cons, and installation considerations.

What is a dormer?

small white house exterior

Credit: Anthony Masterson

It’s avertical windowset on a slanted roof.

Prominent in 16th-century European architecture, many American homes feature them.

Because dormers jut out beyond the pitched roof, they add depth and dimension to a home.

white home exterior

Credit: Emily Followill

A dormer is also a practicalsource of ventilationthat enables airflow and natural light to pass through your home.

In older homes, these can be found inwalk-in atticsor low-clearance top floors.

What Kind of Houses Have Dormers?

pitched roof colonial style home

Credit: Edmund Barr

Dormers have been a part ofWestern architecturefor centuries.

English Gothic and Catholic churches also have prominent dormers.

These days,many single-familyor semi-detached homes in the United States have them too.

Anexperienced roofing contractorwill ensure the valleys along the side of the dormer are water-tight and properly insulated.

So, check with a professional for a feasibility analysis before embarking on a DIY journey or buying materials.

Consider that these changes could void existing roof warranties.

You’ll also need to inform your homeowner’s insurance that significant repairs are underway.

According to an updated report from HomeAdvisor, the average cost of installing a dormer is $12,000.

If your home already has a dormer window, you’re in luck.

You know the versatility of the design and enjoy the aesthetic appeal it adds to the house.

Prioritize care and maintenance by insulating dormer windows in the loft, bungalow, or attic floors.

This will make the space more functional and ensure it won’t unexpectedly increase heating or cooling costs.

Don’t forget that drainage and flashing are crucial to the life of the roof.

Make suregutters and downspoutsare correctly placed.

Many times, it’s impossible to distinguish the difference between the two by simply looking at the house.

A loft is the general term for the elevated area or room directly underneath the roof.

False dormers won’t have a window because they are for appearance only.

How Much Does a Dormer Addition Cost in 2024?HomeAdvisor.