The 4000 SquareLine Flush Sash casement window from Harvest Energy is a perfect fusion of heritage-inspired design and advanced functionality. Crafted to replicate the look of traditional timber frames, this innovative window system offers clean lines, a flush finish, and timeless appeal—ideal for both period-style homes and modern properties seeking classic character.

A standout feature of the SquareLine system is the option for mechanically jointed corners, which not only adds to the authentic appearance but also enhances the structural integrity of the frame. The inclusion of a deeper bottom rail further reinforces the traditional aesthetic while providing robust performance.

These windows are designed with energy efficiency in mind, helping to reduce heat loss and contribute to lower energy bills. Manufactured using premium materials and expert craftsmanship, they are built to the highest standards of quality. The durable construction ensures excellent long-term performance with minimal maintenance required.

Beyond functionality, Flush Sash UPVC windows offer a unique aesthetic that blends classic styling with modern finishes, creating a refined and distinctive look. Whether you're restoring a heritage property or enhancing a contemporary home these windows provide the perfect balance of elegance, efficiency and lasting reliability.