Building and public works are D.I.D's historic core business. A BAT5-rated civil engineering and design-build contractor — the highest national qualification level — the company designs and delivers structures of every kind across the entire Mauritanian territory: hospitals and medical technical facilities, institutional headquarters, housing programmes, markets and public facilities, roads and engineering structures. Its wholly-owned plant — concrete batching, lifting, workshops — keeps every schedule under its own control.
- Hospitals and healthcare facilities: university hospitals, specialised centres, regional hospitals, hospital technical packages (MEP & medical services)
- Institutional buildings: agency headquarters, assemblies, government offices
- Housing: large-scale social and mid-range housing programmes
- Urban facilities: markets, covered market halls, schools, health centres
- Roads, rural tracks and engineering structures
