Drainage and Slope Stability: What Hillside Sites Need to Get Right

Fil Engineers

Published on: 07/10/2026

A plain-language guide to drainage and slope stability on hillside sites in NZ, what the Building Act requires, and warning signs to watch for.

drainageslope stabilitygeotechnicalhillsidebuilding consent

Retaining Walls: When You Need an Engineer and When You Need Consent

Fil Engineers

Published on: 06/10/2026

A plain-language guide to when a NZ retaining wall needs a building consent, when it needs an engineer, and what keeps it standing.

retaining wallsbuilding consentgeotechnicalNZ building codefoundations

Fil Engineers

Published on: 04/10/2026

A plain-language guide to when a geotechnical report is needed, and what scala tests, CPT and boreholes actually involve.

geotechnical reportfoundationssite investigationNZS 3604building consent