Professional Contractor Support Pella® is committed to providing professional contractors with the right windows and doors for virtually any project. Learn more about the advantages of working with Pella by visiting our Haverhill Showroom. Dedicated Representatives. Pella’s dedicated representatives will assist you with estimates, on-site project management, walk-throughs and service after the sale. We will partner with you find the best products for your clients’ projects. Built To Order. Pella products are made to order, and our delivery truck will arrive when and where you need it. Our windows are packaged for protection and easy handling to make the installation as smooth as possible. Full Range of Products. As a Pella partner, you’ll be granted access to our wide range of beautifully crafted products to meet and fulfill all of your clients’ window and door needs. Pella Certified Contractor. The Pella Certified Contractor program offers training and support programs to strengthen your relationship with Pella. Learn more about how you can participate in Haverhill Pella showroom's services to support professional contractors in your area.