ISTL have a history of working for the most professional and successful developers and contractors inculding:

• Bellway Homes
• Bovis Lend Lease
• Leadbitter Construction
• Midas Construction
• Ty-Croes

For such end users as:

• MOD

• Linc Cymru
• The Guinness Trust
• Gwalia

ISTL use a small number of specialist sub-contractors to allow a dedicated team to concentrate on each system.  They include:

• ADC Communications
• Elite Aerial Services
• Hall & Kay
• Smoke Ventilation Systems
• Temperature Control
• Siemens Build Technology