Welcome to the Issaquah Builders FirstSource! Our Issaquah store is your local source for building materials east of Seattle. We have the building supplies you need for new projects such as windows, doors, siding, roofing and more. You will also find a full assortment of building supplies including treated lumber and engineered wood. One of our sales representatives can even meet with you at your jobsite to make sure you receive what your need. Whether you are building a new or custom home, remodeling or taking on any type of DIY home improvement project, we'll help you get the job done. Come visit us today!