|David D. Snell Building Services Ltd. specializes in a variety of windows that will reduce your energy costs, provide additional security and give your home a fresh new look. These days, windows just aren’t what they used to be, and that’s a good thing! Today’s beautifully designed windows come in a wider variety of designs, shapes and sizes. The refined materials and improved details in our windows not only provide access to fresh air and light, they also provide more control at your fingertips and enhanced security levels. David Snell Building Services Ltd. is Window Wise Certified. Window Wise is a replacement window quality assurance program designed to give homeowners peace of mind that their investment in window replacement will be a lasting one. They approve window replacement manufacturers and certify window installation contractors.