If you need further assistance please call us at 1-888-866-1149
or email us at

Curb vs. Deck Mount

Deck mounted skylights are attached directly to the roof sheathing and attaches to the drywall that sits below. These are typically installed in slightly sloped roof pitch situations so the water will run around the skylight and not into the building. For a deck mounted skylight, the minimum pitch is 3:12 / 14 degrees or greater.

Curb mounted skylights sit on a 2x4 or 2x6 curb or raised frame when the roof pitch is lower or flat. The curb itself will channel water away from the skylight keeping the space below dry. The roof pitch for a curb mounted skylight is is 0:12 / 0 degrees to 20:12 / 60 degrees.

Custom Skylights

Custom sizes for residential skylights are available for curb mounted fixed skylights (FCM) and deck mounted fixed skylights (VCM).

Custom-sized commercial units may also be available depending on the size and glass.

Please calls us at 888-866-1149 to get a quote for a custom-sized skylight.

Model & Serial Numbers

Every VELUX skylight and roof window features a data plate mounted on the frame. This dataplate contains the product serial number, which tells the skylight model, glass type and date of manufacture.
When ordering accessories for existing products or requesting product servicing, you should locate this number prior to contacting us. Doing so will help us provide you with the best service possible.
Tip: For the FS the plate is located at the bottom left frame, VS/VSE is at the bottom left sash. For QPF, FCM, VCM and VCE the information is stamped into the side of the exterior covers.

Fixed Skylights

A fixed skylight can also be referred to as a non-venting skylight. The glass is stationary and does not open or close. In comparison, a venting skylight - manual, electric, or solar powered - will open to allow fresh air to enter and humidity to escape. View a full list of our fixed skylights for more details.

Flashing Kits

Flashing kits/systems are designed to shed water without relying on sealants that can break down over time. Boiled down: it's what keeps the rain out! View our flashing systems section for more details.

Glass Type Selections

Laminated glass is a combination of two or more glass sheets with one or more interlayers of plastic (PVB) or resin. In case of breakage, the interlayer is designed to hold the fragments together. Tempered glass does not contain an interlayer to hold the fragments together. Instead, tempered glass is designed to break into small, pebble-like pieces. When tempered glass breaks, pieces of glass come loose and may strike an individual.

Installation & Instruction Help

Parts for Existing Skylights

Thank you for contacting us regarding your need for a replacement part for your existing skylight.
We are pleased to offer many different parts and accessories for your existing skylight. We offer flashing kits , replacement hatches, blinds and so much more!  To view parts and accessories please click on the link below
VELUX Skylight Parts and Accessories | Skylights for Less
If you do not see the part or accessory needed please contact us at and one of our representatives will be happy to assist you.

Velux Acessories and Parts for Pre-2010 Skylights are available in a wide range of sizes with various features to fit almost any application. Keep the value of your older Velux Skylights by ensuring they function properly. We carry a full assortment of Velux parts and accessories to suit your needs.


Standard size and glazing skylight orders which have been accepted may be cancelled only with prior written consent of upon terms that willfully indemnify against loss. Products are not to be returned without prior authorization. Product may not be returned more than 15 days after date of invoice. Contact via email email at Please include order # and description of problem.A restocking charge of 15% of the invoice amount applies to all returns. Purchaser is responsible for the freight back to the nearest Velux Distribution Center. All VELUX skylights with factory installed blinds are non-returnable and non-cancellable. Special Color Blinds, Custom size skylight or custom glass skylight orders cannot be returned or refunded under any circumstances once the customer has signed the special order form and the signed order form has been received for processing.

Return policy for Damaged Items
Skylights For Less will always replace any damaged items in a prompt fashion. Skylights are typically replaced in less than one week, however lead times vary depending on the product or specification. We do ask that you inspect shipments thoroughly upon receipt and prior to signing. Damaged shipments should be refused or received with notation of apparent damage. Details of damage is helpful, but most importantly, noting that damage is recognized helps all parties when settling claims.

All damages, errors, or inaccuracies must be reported within 24 hours of delivery. Please contact us to obtain an RGA (Return Goods Authorization) number: 1. Fill out RGA form online» 2. Email for an RGA#Upon obtaining an RGA number, you are required to return the product(s) within 15 days to the designated warehouseAn RGA will only be issued up to 30 days from the date of deliveryAll items associated with this RGA must be returned no later than 15 calendar days from the date the RGA was opened.

Returns are not accepted for the following items:

Commercial sun tunnels
Commercial skylights
Custom-built skylights
Skylights with factory-installed blinds
Custom blinds

Cancellation Fees
All orders canceled prior to or after shipping may be subject to a cancellation fee of up to 15%. A 30% restocking fee may also be accessed in accordance with our return policy.

Velux Warranty Information

If you think that all skylights leak, it's time to think again. VELUX® roof windows and skylights do not leak. Proven in installations and climates throughout the world, our exclusive flashing systems will keep you dry and comfortable.
Deck mounted skylights come with an industry first 10-year "No Leak" installation warranty that covers correct skylight and appropriate flashing installations (product and labor) against leaks, no matter who installs the skylight. For important details about this outstanding warranty, please see the warranty brochure below.
The best guarantee is the one you never have to use, therefore, VELUX builds quality into every product. VELUX offers 20/10/5 years limited product warranty for specific product coverage issues. If you have concerns about your VELUX products that may require a warranty claim, the warranty brochure includes specific steps for you to follow that will help VELUX better assist you.

Download our warranty guide
[PDF viewer required]
Note: This warranty does not apply to VELUX products with SageGlass® electronically tintable glazing or VELUX products purchased prior to January 1, 2010.


Order shipping within the 48 Continental United States will ship freight with a flat rate fee based on the order total provided that oversized, common carrier, special handling or expedited freight do not apply. 

Skylightsforless is not responsible for any return product shipping costs.

Items shipped outside of California and New York will not be charged sales tax.

Full Shipping Policy and Shipping Rates

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