Welcome to Olsen Infrastructure

Olsen Infrastructure is a fully accredited Sydney Water Coordinator and building hydraulic firm.

We offer sewer and water solutions for homes and residential developments as well as commercial and government construction projects.

Employing an experienced team of civil and hydraulic engineers, we service projects including:


  • Land development – both small and large subdivisions
  • Housing development – from extensions to new builds
  • Multi-unit development
  • Commercial and industrial developments
  • Medical facilities including hospitals and medical centres
  • Swimming pools and spas
  • Pressure sewerage
  • Civil engineering

As accredited Sydney Water coordinators, we deliver:


  • Section 73 applications
  • Service protection reports (formerly known as sewer peg-out reports)
  • Building plan approvals and associated inspections
  • Pressure sewerage applications including design
  • Water and sewerage design and project management (all classes and sizes)

Our portfolio extends to major projects around Sydney, the Hunter region and interstate.

Contact us today to discuss your upcoming development