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About Us

30 Years of MEP delivery.

Your vision, built right.

With decades of experience and a focus on engineered solutions, at ISTL we don’t make empty promises – we do what we say we will do. ISTL delivers.

Founded in 1995, ISTL are a full-service mechanical and electrical design-and-build contractor, tackling complex projects across Cardiff, South Wales and beyond.

Our journey began with a focus on electrical services, expanding to include comprehensive mechanical solutions in 2000. As Cardiff’s luxury apartment market boomed, ISTL rose to the challenge, establishing a reputation for reliability and skilled execution. Our dedication to practical solutions and quality craftsmanship continues to be a core value.

We go beyond the basics. Our design and build services offer a seamless experience, taking your project from vision to reality. While we excel at core services like heating, plumbing, and lighting, ISTL offers a diverse range of expertise. From data and media cabling to air conditioning and CCTV systems, we handle it all. This comprehensive approach allows us to provide nearly every conceivable building service, streamlining the construction process and saving you time.

Choose ISTL, and choose a collaborative partner – proactive in offering solutions and services that make a real difference to your projects.

Apartments

ISTL have delivered almost 4,000 apartments since our inception in 1995. Engineering a variety of centralised and de-centralised systems across many M&E disciplines. From 2 storey blocks to 25 storey towers and higher, we have the experience and expertise to work with any building technology from simple timber frame to the latest steel and concrete structures.
Build to rent

ISTL has successfully delivered a range of Build to Rent projects, focusing on modern living solutions designed for long-term rental. We specialise in the installation of centralised and decentralised mechanical and electrical systems tailored to this sector’s demands. Our expertise includes comprehensive power and lighting distribution, essential safety systems like fire alarms and access control, as well as advanced data and communication solutions. We ensure that each project meets the highest standards of quality and enhances the living experience for residents.
Student accommodation

ISTL has played a key role in delivering quality student accommodation, creating vibrant living environments that cater to students’ needs. We have engineered nearly 1,600 student accommodation units, focusing on the installation of robust mechanical and electrical systems. Our services encompass efficient heating, ventilation, and air conditioning, along with essential safety features such as smoke ventilation and CCTV systems. Each project is designed to enhance safety, connectivity, and sustainability, ensuring an optimal living experience for students.
Extra care

ISTL understands the unique requirements of Extra Care housing, having delivered hundreds of homes focused on comfort, safety and independence. We specialise in providing tailored mechanical and electrical solutions for Extra Care homes, prioritising residents’ well-being. Our services include the installation of emergency call systems, efficient heating and cooling solutions and accessible communal areas, along with advanced building management systems. Each project is crafted to support a high quality of life while maintaining the highest standards of care and safety.