Foundation Inspection Software for NZ Builders & Inspectors

The foundation is the most critical structural element of any building. Every load from the roof, walls, and floors is ultimately transferred through the foundation into the ground. If the foundation is defective — whether through incorrect reinforcing, insufficient concrete cover, poor ground preparation, or missing damp-proof membranes — the consequences are severe and effectively irreversible. You cannot dig up and re-pour a concrete slab once it has cured.

In New Zealand, foundation construction must comply with Building Code clause B1 (Structure) and the specific engineering design approved as part of the building consent. For standard residential construction, NZS 3604 provides prescriptive requirements for concrete slab-on-ground foundations, including minimum slab thickness, reinforcing mesh specifications, and edge thickening details. However, many modern homes — particularly those on sloping sites, poor ground, or with specific architectural requirements — require bespoke engineering design that goes beyond NZS 3604.

Council building inspectors typically conduct a single foundation inspection at the "pre-pour" hold point. This inspection confirms minimum code compliance — that reinforcing steel is in place, formwork is set to the correct dimensions, and the site is ready for concrete. But council inspections are limited in scope and time. An independent foundation inspection provides a far more thorough assessment: checking rebar spacing against the engineering drawings, verifying cover depth with spacers, confirming that ground preparation meets the geotechnical requirements, and documenting the condition of in-slab services.

Common findings at the foundation stage include insufficient concrete cover to reinforcing steel (exposing it to future corrosion), incorrect rebar spacing that does not match the engineering design, inadequate ground compaction or removal of organic material, missing or incorrectly placed damp-proof membrane (DPM), and in-slab plumbing that has not been pressure-tested. Any of these issues, if not caught before the pour, become permanent defects that can lead to structural failure, moisture ingress, or costly remedial work years down the line.

For homeowners commissioning a new build inspection, the foundation stage is the single most important inspection to get right. It sets the structural baseline for the entire building. InspectPro ensures that inspectors can document this critical stage thoroughly, with annotated photographs and structured reporting that provides an unambiguous record of what was — and was not — in place before the concrete was poured.