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- Windows
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  Hinged at the side and swing outward.
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  Hinged at the top and swing out from the bottom.
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  Two sashes capable of sliding up and down.
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  Slides up from the bottom, while the top sash stays stationary.
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  Picture
  Fixed frames that do not operate.
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  Sliding
  Open horizontally, gliding on a track from one side to the other.
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  Custom
  Made-to-order windows not found in the standard offering.
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  Slides, folds or pushes open to pass items between spaces.
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  Four or more windows, each the same size and shape, joined to form a smooth curve.
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- Doors
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    Hinged or French Patio Doors
    1 or 2 doors that swing in or out.
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    Sliding Patio Doors
    Panels of glass that slide open horizontally.
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    Bifold Patio Door
    Expansive panels of glass that fold like an accordion.
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    Multi-Slide Patio Door
    3 or more panels that glide open horizontally and stack.
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    Solid Fiberglass Door
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    Solid Steel
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- Pella Vista SeriesNEW!
  Precision crafted aluminum that helps blur the line between indoors and outdoors.
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Pella Windows & Doors of Denver & Northern Colorado (303) 371-3750

Don Lammers

Trade Project Consultant

Areas of expertise: Windows and doors
Years of industry experience:35+ years
Awards: Top Gun (2013-2014, 2017) President's Club (1997-1998, 2003, 2005-2007, 2011-2021, 2024, 2025)

Don Lammers is a Trade Project Consultant serving Denver and the surrounding counties. He earned his bachelor’s degree in business management in 1984 and brings over 35 years of experience with Pella. Throughout his career, Don has been recognized for his exceptional performance, earning 19 President’s Club Awards, the Verkoop Bond Award, three National Top Gun Awards and the prestigious Kuyper Club Award. Outside of work, Don enjoys skiing, jeeping, camping and restoring vintage cars and trucks.

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