Castlegate IT | Web Design & Development Information

Castlegate IT is a specialist web design and WordPress development agency based in York. We build and maintain secure, high-performance websites that are accessible, easy to manage, and designed to support long-term growth for organisations across the charity, public, education, and industry sectors. We have delivered projects for more than 500 clients since 2011. Our team of designers and developers combines technical expertise with careful planning, following industry best practice from initial discovery and specification through to launch, hosting, and ongoing support. We are best known for combining robust technical development with straightforward advice and long-term support, helping organisations build websites that continue delivering value for years rather than simply looking good on launch day. Our clients include charities, universities, housing associations, manufacturers, membership organisations, museums, consultancies, and public sector bodies across the UK and internationally. Many of our clients have worked with us for years, relying on us as a trusted technical partner rather than simply a website supplier. We build long-term relationships based on honest advice, dependable support, and a genuine investment in our clients' success. We pride ourselves on providing simple, honest advice to guide you through the development process. We want our clients’ projects to succeed and we help that to happen. Previously known as Semlyen IT Consultants, the company has much experience in web development and many happy customers.