Diagram of a VELUX Custom FCM skylight with text describing curb, outside curb dimension, and make sizeThere are many reasons why installing Velux Custom Fixed Curb Mounted Skylights is a bright idea.

  • Applicable in both Residential or Commercial settings.
  • Available in almost any size to suit your custom needs.
  • Designed to provide optimal light distribution while minimizing glare and enhancing the character of architecutral designs.

Designed to work with all types of site-built curbs.

  • Minimum Width Make Size is 18¾ and cannot exceed 50¼".
  • Maximum Height Make Size is 76½"

We carry a full assortment of Velux parts and accessories to suit your needs. We also have many different sizes and styles of flashing available to complete your installation. Looking for more information on the custom sizes available? Fill out the contact form below with your project specifications and we'll reach out to you as soon as possible!


Velux Custom FCM Glass Skylights are made to fit existing curbs:

  • Minimum Width Make Size is 18¾ and cannot exceed 50¼".
  • Maximum Height Make Size is 76½".*

Standard Glass options include Tempered Low E Glass or Laminated Low E Glass.**

We require maximum skylight clearance dimensions in 1/4" increments (0, 1/4, 1/2, 3/4) for width and height.

Note: Custom size flashing kits and custom size blinds are not available.

Call (888) 866-1149 or complete the form below to inquire today!

* If your skylight dimensions exceed the Maximum Make Size, please call our office for our Specialty Skylight options or submit the form with your dimensions and project specifications.

** Specialty Glass options require longer lead times.