Residential Due Diligence vs Commercial Due Diligence

Residential due diligence in New Zealand follows a well-established pattern. You order a LIM report from the council, commission a building inspection, have your lawyer review the title and sale and purchase agreement, and arrange finance approval. Most residential buyers also include conditions for these checks in their agreement.

The focus is on the property's physical condition (weathertightness, structural soundness, moisture levels), council compliance (consented work, Code Compliance Certificates), and legal title (ownership, easements, covenants). The process is well understood, and timeframes are predictable — typically 10-15 working days.

For standard residential properties, this level of due diligence is sufficient to identify most material risks.

Commercial due diligence covers everything residential does, plus several additional layers. Zoning is critical — you must confirm that your intended use of the property is a permitted activity under the district plan. A property zoned for retail may not allow an office, and vice versa. Resource consent may be needed for certain uses.

Seismic assessment is essential for commercial buildings, particularly older ones. Under the Building (Earthquake-prone Buildings) Amendment Act, buildings rated below 34% of the New Building Standard (NBS) are classified as earthquake-prone. This can restrict use, require costly strengthening (potentially hundreds of thousands of dollars), and affect insurance and lending.

Environmental contamination is another major consideration. If the property has a history of industrial or commercial use (petrol stations, dry cleaners, workshops), contamination may exist. A Phase 1 environmental site assessment reviews the site history, and a Phase 2 assessment involves physical testing. Remediation can be extraordinarily expensive.

If you are buying a commercial property, you need the full commercial due diligence process. Residential due diligence is not sufficient — it does not cover the additional risks that are unique to commercial property. Even if you are buying a commercial property for conversion to residential, you still need the commercial-level checks initially.

For commercial property, start with zoning verification and a high-level seismic assessment before investing in detailed inspections. If the zoning does not permit your intended use, or the building is earthquake-prone, you may want to walk away before spending thousands on detailed reports.