How to Choose Interior Window Trim

A guide to interior window trim to help homeowners make the right choice.

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We can’t tell you which interior window trim is best for your home, but we can give you enough information to make the choice yourself. Here’s what you need to know about interior window trim, including what it does, why you need it and which options you might want to consider.

What is Interior Window Trim?

Let’s start with the basics: Interior window trim is a piece of wood or composite that covers the seam where a window meets a wall. It functions like baseboards or crown molding.

A home can have interior and exterior window trim. They serve the same purpose but usually aren’t identical. Exterior window trim needs to be more waterproof. “For the outside of a home, vinyl, synthetic or exterior-rated building materials should be used,” explains Michael DiMartino, senior vice president of installations at Power Home Remodeling.

Interior window trim has two main purposes: insulation and decoration. Interior window trim is often more decorative so wood is a viable choice. “Window trim will work as an important barrier to help keep outside air out of the home, and inside air in,” says DiMartino. It also adds another layer of protection to the insulation around the window.

For decoration, window trim works to cover imperfections and add style. “It’s just about impossible to put a window in and have everything match up perfectly so that it doesn’t need any trim,” says Melanie Musson, a window expert with

Trim covers any messy spots left behind after the window installation. Some interior window trim is sleek and simple, while other styles can have beautiful patterns and colors.

Interior window trim elevates an entire home, and people take notice — including when it’s time to sell. “High end woodwork is a big booster of home value and is often sought after by prospective buyers,” says DiMartino.  When done right, it is a timeless piece of home décor.

Types of Interior Window Trim

DiMartino and Musson both cite wood as the most used interior window trim material. But there are tons of options with varying prices. Wood itself has many options to choose from.

“Depending on your design vision, style of home and budget, I’d recommend using different types of wood,” says DiMartino. He recommends poplar for painted trim thanks to its smooth finish, and strong-grained oak for stained.

Wood composites and vinyl are other common interior window trim materials, offering more variety in style and budget. You’ll see a lot of vinyl in commercial builds, DiMartino says, since “it holds up to wear and tear and is more budget friendly for larger scale projects.”

With interior window trim design style, the options are endless. There’s something to match any home. You’ll find colonial, Victorian, modern and Craftsman trim, as well as any other home style. Start with the most common and easy to find. DiMartino identifies four common styles: flat, colonial, fluted and ranch.

  • Flat window trim looks exactly how it sounds. This is a simple, inexpensive and timeless choice for interior window trim.
  • Colonial window trim is still inconspicuous and refined, but has more detail than flat trim. Gentle curves and subtle indents characterize this interior window trim style. Multiple pieces may be combined to achieve a wide trim look.
  • Fluted window trim features straight, uniform lines. It adds visual interest without overpowering a room, and the lines can even make a space appear bigger.
  • Ranch window trim is similar to flat trim, but with a curved or angled face.

How To Choose Interior Window Trim

Choosing interior window trim comes down to budget and style. Consider the initial cost of materials and installation as well as ongoing maintenance costs.

Don’t forget your DIY ability. Installation is a significant chunk of the overall price. If your carpentry skills are strong, you could bypass installation costs and afford a more expensive wood trim. If you’re paying for installation, a cheaper trim style or material might be better.

Ronnie Collins, a professional carpenter and founder of Electro Garden Tools, says the average cost of materials and installation runs from $6.21 to $9.63 per linear foot. “This means that an average project will cost you around $450-$550 with labor,” he says. “If you want to DIY, the price will be just $0.90 to $1.35 per linear foot.”

To choose the right style, head to a store or peruse interior design photos online for an idea of what you like. Look at the trim and molding around the rest of your house. Unless you plan to replace all the woodwork, it’s smart to match your windows to the rest of your interior trim.

DIY Interior Window Trim

Fortunately, it’s possible to DIY interior window trim with the right tools and skills. Measuring and cutting the pieces is the hardest part. Collins recommends using a miter saw and a brad nailer. You can also DIY trimless windows for a fresh and minimalist look. When in doubt, call a pro.

Mikayla Borchert
Mikayla is an assistant editor for Family Handyman, specializing in indoor and outdoor gardening, organization and décor. She has one cat and holds a B.A. in English from the University of Minnesota. Outside of work, she likes running, skiing, hiking and tending her balcony garden.