A sliding patio door that becomes heavy to move may have worn rollers, track problems or alignment issues. The surrounding frame and panel condition also matter. The appropriate repair cannot be determined only from the effort needed to slide it. A service visit should establish where the resistance comes from and which components remain serviceable.
Describe whether the panel moves unevenly, catches at one point or has difficulty lining up with the lock. A short video can show the operating pattern. Mention visible track damage and any earlier repairs so the technician has context. These observations help define the inspection without expecting the customer to remove or adjust the door.
Parts availability may affect the options. Roller assemblies and other hardware should match the door rather than be selected only by a general description. Ask whether the estimate depends on identifying the existing components first. The proposal should also explain if the work includes related alignment or lock adjustments after the movement issue is addressed.
770 Doors & Windows can assess sliding doors at homes and commercial properties. Send photos of the complete unit and any accessible product label, together with your ZIP code. The goal is a clear repair recommendation based on the panel, track and supporting hardware, rather than replacing the entire door without reviewing the cause.