Where’s the job?

Overview

• Commercial structure underpinning involves reinforcing existing foundations by extending them deeper or widening the base to improve load capacity.

• Skill level: 5 / 5 (critical structural stability requires advanced engineering, precise equipment and expert oversight).

• Typical duration: 3 – 7 days depending on the building size, underpinning method and site conditions.

Safety First

• Verify load capacity and assess structural integrity before commencing works.

• Adhere strictly to local building codes and safety regulations.

• Wear appropriate PPE—hard hats, safety boots, gloves and eye protection.

• Use temporary shoring and supports to prevent any risk of collapse during excavation.

• Isolate any utilities or services in the underpinning area.

Tools & Materials

Step-by-Step

1. Assess the structural plan – review building surveys, soil reports and underpinning methods (mass concrete or beam underpinning).

2. Set up safety zones – cordon off the area and install temporary shoring to support the structure.

3. Excavate beneath the foundation – carefully remove soil whilst maintaining structural stability.

4. Install shoring and hydraulic jacks – provide temporary support and lift the structure as needed.

5. Pour concrete or place underpinning beams – follow engineering specifications precisely.

6. Allow concrete to cure and secure all reinforcement – ensure full strength is achieved before removing supports.

7. Finalise and document – remove temporary supports and carry out a thorough structural inspection.

Completion Checks

• Structural surveys confirm underpinning works meet engineering standards.

• No cracks, misalignments or instability noted post-implementation.

• Temporary supports have been safely removed and final checks documented.

• All permits and engineering certifications are in place.

When to Call a Pro Instead

For commercial underpinning projects, always consult a specialised structural engineer or a certified underpinning contractor to ensure compliance, safety and engineering certification.