Super Seal NI

Super Seal NI is a leading manufacturer and supplier of high-performance uPVC and glazed window and door systems based in Castledawson, Northern Ireland. With more than three decades of industry experience, the company designs, fabricates and delivers durable, energy-efficient windows, doors and related products to both trade customers and homeowners across Ireland and the UK.

Specialising in bespoke manufacture, Super Seal NI offers a broad range of double-glazed uPVC and composite doors, custom window styles and patio systems tailored to specific architectural and performance requirements. Its products are engineered to provide enhanced thermal efficiency, security and long-term weather resistance, supporting modern building standards and comfort needs.

Built on a foundation of quality craftsmanship and customer service, Super Seal NI combines skilled fabrication with responsive supply and support. Its commitment to technical excellence and tailored solutions has established the company as a trusted partner for builders, installers and property owners seeking reliable window and door systems from a Northern Ireland manufacturer.