SERVICES.

What We Offer

Located in Sydney’s Sutherland Shire, Perennial Consulting Engineers offer advisory, detailed design and project management services for all kinds of development, specializing in flood risk assessment and stormwater management.

We provide expertise in practical civil engineering solutions tailored to projects of any size or type - from single residential dwellings and dual occupancies to high rise mixed-use developments, industrial estates, infrastructure and subdivisions.

In addition to primary design services, we also offer:

  • Due diligence and feasibility reporting

  • Construction support and certification

  • Development application management

  • NSW Land and Environment Court

Cover page of a report titled 'Flood Impact & Risk Assessment Report' with a technical blueprint or architectural drawing in the background, dated June 2025.

Primary Services

  • stormwater management

  • flood risk assessment

  • Technical engineering drawing of a construction site plan with measurements, labels, and structural details for underground utilities and tank systems.

    on-site detention

  • A detailed flood risk and planning map of a property outline showing areas of floodway in red, flood storage in yellow, flood fringe in blue, and flood planning zone in gray, with labels for existing and proposed flood defenses and property features.

    flood impact assessment

  • A detailed engineering drawing or site plan with measurements, annotations, and construction instructions for a project.

    frontage/access grading