Updated: 17 February 2026

Importance Level 1 (IL1)

Overview

Buildings or structures classified as Importance Level 1 (IL1) present a low degree of hazard to life and other property in the event of failure.

This classification is often used for minor or isolated structures where the risk to surrounding property or public areas is minimal.

Why this is important

  • Selecting IL1 reduces engineering requirements, but only where appropriate

  • Misclassification may lead to engineering upgrades (and extra cost)

  • Ensures compliance with ShedSafe® and Australian engineering standards

Site criteria – what qualifies as IL1?

To be considered IL1, the structure must meet all of the following conditions within a 200m radius (the blue circle in ShedSafe):

a. The building presents a low hazard to nearby buildings
b. No property boundaries are crossed
c. No public roads are within 200m

🛈 “Other property” includes nearby buildings, roads, and boundaries.

Examples of IL1 buildings

  • Farm buildings and farm sheds

  • Isolated minor storage facilities

  • Minor temporary facilities

Considerations when nominating IL1 in ShedSafe®

Salespeople can select IL1 at any time in ShedSafe®. However:

  • If any of the IL1 criteria are not met, engineers will automatically upgrade the building to IL2

  • Cost increases due to engineering changes must be covered by the franchise or customer

Tips & best practices

  • Always assess surroundings using Google Maps or an on-site visit

  • Avoid using IL1 unless you're confident all conditions are met

  • Confirm zoning or local council info when needed

Importance Level 2 (IL2)

Importance Level 3 (IL3)

Importance Level 4 (IL4)

Site Specific Engineering

Request Engineering (Site Check)

Review & updates

Version history:

  • v1.0 – 

  • v2.0 – 06 August 2025

Article information

  • Category: Engineering & Site Specifications

  • Target audience: Franchise Users, Estimators

  • Business owner: 

  • Version: v2.0

  • Last reviewed: 06 August 2025