Alder Doors products are made in the USA
Sun Mountain, Inc., was founded in 1998. We are an industry-leading manufacturer of custom high-end wood doors, mouldings, and wood beams. We supply customers throughout the U.S. from our 105,000 square foot factory/headquarters in northern Colorado (near Fort Collins). To learn more about our custom products, please visit our corporate website

We are pleased to introduce, providing a value-priced line of solid-core Primed MDF interior doors, all made in the USA at our Colorado factory. As always, we offer the most competitive pricing through our “direct from the manufacturer” distribution model. We also offer optional factory pre-hanging of these doors—further reducing construction time and project cost. And, we ship pre-hung doors (single units) direct to the home or jobsite, eliminating on-site reassembly. Our MDF doors are covered by an industry-leading Warranty.

Thank you for visiting by Sun Mountain. We look forward to supporting your needs for the highest quality MDF doors.

Cory Barnett

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