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Microwave Trim, Fillers & Side Extensions

Get a Quote

Installation Type:

A stainless steel microwave with a sleek Microwave Trim Kit is built into wooden kitchen cabinets above a counter featuring a knife block and decor.
Standalone Above Countertop
Built-in stainless steel microwave with digital control panel set into a wooden kitchen cabinet, featuring a sleek Microwave Trim Kit for a seamless, integrated look.
Standalone Wall
A built-in drawer style microwave with a Microwave Trim Kit sits in a white kitchen cabinet with gold handles on a wood floor.
Standalone Below Countertop

Standalone Microwave Trim Kits

Standalone Microwave Trim Kits are custom-built to fit any microwave and precisely match your cabinet opening. Designed for installations where the microwave is placed above or below a countertop—or when it’s the only appliance in a cabinet—these kits provide a clean, built-in appearance for any configuration.

Trim icon__Microwave Standalone Above Counter
Trim icon__Microwave Standalone Wall
Trim icon__Microwave Standalone Below Counter
Step 1: Select a Measurement Worksheet

Above the Oven Microwave Trim Kit

Above-the-Oven Microwave Trim Kits, also called Matching Width Kits, are custom-made to align a narrower microwave with the oven below it. Designed to create a uniform look, these kits surround the microwave and extend its width to match the oven, delivering a balanced, built-in appearance across your appliance stack.

Trim icon__Microwave Above Oven NO Rail
Step 1: Select a Measurement Worksheet
Built-in microwave with a Microwave Trim Kit above an oven, set in light wood kitchen cabinetry.
Above the Oven NO Rail
Modern kitchen with a stainless steel fridge, oven, and a microwave featuring a sleek Microwave Trim Kit, plus a stovetop on a wooden cabinet island.
Above the Oven with Rail
A microwave with a sleek stainless steel Microwave Trim Kit is installed above a stone backsplash and below gray cabinets.
Stainless Steel OTR Microwave Fillers
Microwave with digital clock display and black Microwave fillers, installed above a black and white marbled countertop.
Black OTR Microwave Fillers
White over-the-range microwave with a sleek Microwave Trim Kit installed beneath gray cabinets and above a stone backsplash.
White OTR Microwave Fillers

Over the Range (OTR) Microwave Fillers

Over-the-Range Microwave Filler Kits are designed to close the gaps on each side of a microwave when the space between surrounding cabinets is wider than the appliance. Available in both standard and custom sizes, these kits ensure a precise fit and a clean, finished look for any installation.

Trim icon__Microwave Over The Range (OTR)
Step 1: Select a Measurement Worksheet

Side Extensions

Side Extensions are custom panels designed to cover an oversized cabinet width or align an appliance’s width with another unit above or below it. Commonly used with Built-in Coffee Makers, Microwave Drawers, Wall Ovens, and Speed or Steam Ovens, they provide a clean, integrated appearance for any built-in installation.

Trim icon__Side Extension with Side Gaps
Step 1: Select a Measurement Worksheet
Built-in stainless steel microwave and oven set in a wooden kitchen cabinet, complete with a sleek Microwave Trim Kit and convenient double doors below.
Microwave Side Extensions
Built-in stainless steel Bosch cappuccino machine above a wall oven, complemented by a sleek custom side extensions, in a modern kitchen.
Coffee Maker Side Extensions

Microwave Trim Kit Finish Options

Stainless Steel vs. Aluminum Comparison

Feature

True Stainless-Steel Trim Kit

Aluminum Trim Kit

Material

18-gauge 304 stainless steel

High-quality aluminum

Finishes Available

True Stainless Steel

Black, White, Stainless finish

Construction

1 solid piece

4 pieces (2 vents + 2 side panels)

Profile Thickness

Matches microwave door profile for a flush fit

Fixed 7/16"

Installation

Mounting brackets, magnetic trim attachment, includes support runners

Mounting screws & includes support runners

Look & Feel

Seamless, professional, built-in appearance

Professional, built-in appearance.

Best For

Premium kitchens, high-end remodels

Cost-effective, kitchen remodels

How to Get a Quote

Choose install type

Select a worksheet page from the directory below that matches your appliance installation type.

Measure your space

Download and open the Measurement Worksheet to record all required dimensions for your project.

Complete the form

Return to the Measurement Worksheet page to find the corresponding Order Request Form. Use your measurements and upload photos (optional) to complete the form.

Talk to a real person

When we receive your Order Request Form, one of our experts contacts you to review your project and provide a quote.

STEP 1: Select a Worksheet

Click on a drawing or name below to open the page and download a worksheet to record the measurements for your order request.

View full Measurement Worksheet Directory

Need help with your quote? Give us a call (800) 338-8746

Frequently Asked Questions

A trim kit is a custom frame that allows a countertop microwave to be built into a cabinet or wall. It ensures ventilation, includes support runners, and provides a clean, built-in look.

Yes. Standard countertop microwaves can be used as long as they are at least 2½″ shorter than the cabinet cutout to allow proper ventilation.

Yes. All microwave trim kits include venting. Options may include a front-vented design or a solid front with vents at the top and bottom.

They are side fillers used when replacing a 36″ over-the-range microwave with a 30″ model, filling the side gaps for a finished appearance.

Yes. We fabricate custom trim kits for microwave drawers and built-ins with pull-down doors.

Use our online, or printable, measuring worksheets in the Measure Worksheet Directory. Your project worksheet guides you through what to measure.

Yes. All microwave trim kits include metal support runners to center the microwave vertically.

Generally no. Because sizes differ between appliances, trim kits are not reusable. Aluminum kits may sometimes be modified; stainless kits cannot.

Standalone Microwave and Above the Oven Microwave Trim Kits

  • Brushed Aluminum (“Stainless Finish”)
  • Semi-gloss powder-coated Black or White
  • True Stainless Steel.

 

Over the Range (OTR) Microwave Fillers

  • Semi-gloss powder-coated Black or White
  • True Stainless Steel
  • Brushed Aluminum is NOT available for OTR kits

 

Side Extensions

  • ONLY True Stainless Steel

A trim kit is a custom frame that allows a countertop microwave to be built into a cabinet or wall. It ensures ventilation, includes support runners, and provides a clean, built-in look.

Yes. Standard countertop microwaves can be used as long as they are at least 2½″ shorter than the cabinet cutout to allow proper ventilation.

Yes. All microwave trim kits include venting. Options may include a front-vented design or a solid front with vents at the top and bottom.

They are side fillers used when replacing a 36″ over-the-range microwave with a 30″ model, filling the side gaps for a finished appearance.

Yes. We fabricate custom trim kits for microwave drawers and built-ins with pull-down doors.

Use our online, or printable, measuring worksheets in the Measure Worksheet Directory. Your project worksheet guides you through what to measure.

Yes. All microwave trim kits include metal support runners to center the microwave vertically.

Generally no. Because sizes differ between appliances, trim kits are not reusable. Aluminum kits may sometimes be modified; stainless kits cannot.

Standalone Microwave and Above the Oven Microwave Trim Kits

  • Brushed Aluminum (“Stainless Finish”)
  • Semi-gloss powder-coated Black or White
  • True Stainless Steel.

 

Over the Range (OTR) Microwave Fillers

  • Semi-gloss powder-coated Black or White
  • True Stainless Steel
  • Brushed Aluminum is NOT available for OTR kits

 

Side Extensions

  • ONLY True Stainless Steel