Foundation Inspection Checklist

Foundations carry the entire building, and almost every defect in them is concealed the moment concrete is poured. That makes foundation inspection one of the highest-stakes checks on any project — and a genuine hold point. Get it wrong and the consequences range from cracking to structural failure, with remediation that's enormously expensive or impossible.

This checklist covers the key foundation inspection points. Always work to the structural engineer's drawings, the specification, and building control requirements, which take precedence over any general guidance.

Before excavation

• Setting out checked against drawings — position, dimensions, and orientation.
• Existing and buried services located and avoided.
• Ground investigation/soil report reviewed and understood.

Excavation and formation

• Excavation to correct depth, width, and dimensions per drawings.
• Founding stratum reached and matches the assumed ground conditions — a key check; if the ground differs from the design assumption, the engineer must be informed.
• Formation level, clean, and free of loose material, water, and debris.
• Sides stable and supported as required (this is also a safety hold point).
• No soft spots, tree roots, or made ground at formation.

Before concrete (the critical hold point)

• Reinforcement: correct bar size, number, spacing, and grade per drawings.
• Laps, anchorage, and starter bars correct.
• Cover to reinforcement correct, with spacers in place.
• Any cast-in items (holding-down bolts, dowels, ducts) positioned correctly.
• Formwork/shuttering to correct line and level, clean and secure.
• Damp-proof membrane / blinding in place where specified.
• Pre-pour inspection signed off and, where required, building control notified/attended.

During the pour

• Concrete mix matches specification (strength, slump) — check delivery tickets.
• Slump/workability test within tolerance.
• Test cubes/cylinders taken and labelled.
• Concrete placed without segregation, properly compacted.
• Pour continuous; construction joints only where planned.
• Levels checked as the pour proceeds.

After the pour

• Surface finished and to level.
• Curing applied and maintained for the required period.
• Protected from frost, rain, and disturbance while gaining strength.
• Formwork struck only after adequate strength gained.

Records to keep

• Signed pre-pour inspection.
• Building control approval/inspection record.
• Concrete delivery tickets and slump results.
• Cube/cylinder test certificates.
• Photographs of formation, reinforcement, cover, and the completed pour.

These records are your proof the foundation was built correctly — and the only way to demonstrate it once everything is buried.

Why photographs matter so much here

Because foundations are concealed, photographs of the reinforcement, cover, and formation taken at the pre-pour stage are irreplaceable. If a question ever arises about what's in the ground, those images are the only evidence. Capture them deliberately and keep them with the inspection record.

Capturing it digitally

A site inspection app lets you complete the foundation checklist on a tablet at the excavation, attach the critical pre-pour photos to each item, capture the sign-off, and hold it all against the specific foundation — so the full, photo-backed record exists before the concrete truck arrives.

Key takeaways

Foundation inspection is a critical hold point because defects are concealed by the pour. Check setting out and excavation, confirm the founding stratum, and rigorously inspect reinforcement, cover, and formwork before concrete. Verify the mix at delivery, control placing and curing, and — above all — keep photographs of the concealed work. It's the one record you can never recreate.