Due Diligence Checklist for Commercial Property Purchase

Commercial property due diligence covers more ground than a residential purchase, largely because the property is usually generating income, operating under specific planning approvals, and subject to compliance obligations that do not apply to a house. A buyer who treats a commercial purchase like a residential one risks missing issues that only surface after settlement, when they are far more expensive to fix. The following areas form the core of a thorough commercial due diligence process, and the order in which they are tackled often matters as much as the checks themselves, since some findings will shape how the others are investigated.

Title and Ownership Searches

As with any purchase, a title search confirms who legally owns the property and reveals any registered mortgages, caveats or easements affecting it. For commercial property, it is also worth checking for registered leases, encumbrances relating to shared driveways or loading areas, and any covenants restricting how the site can be used. Where a property sits on land that has been recently subdivided or combined, confirming the current title description matches what is being sold is an essential first step.

Zoning, Permitted Use and Council Records

Zoning determines what the property can legally be used for, and this needs to be checked against the buyer's intended use, not just the current tenant's use. A property zoned for light industrial purposes, for example, may not permit certain retail or hospitality activities without a further planning approval. Buyers should also check for any conditions attached to existing development approvals, since these run with the land and bind a new owner in the same way they bound the seller. A council search adds a further layer to this picture, revealing whether there are any outstanding orders, notices or unresolved building matters attached to the property, which matters most for older commercial buildings that may have had work carried out over the years without the required approvals. It is also worth checking for planned infrastructure works nearby, such as road widening or utility upgrades, that could affect access, parking or the future value of the site, since this information is not always volunteered by the seller and often needs to be requested specifically.

Reviewing the Lease If the Property Is Tenanted

Where a property is sold with an existing tenant, the lease itself becomes one of the most important documents in the transaction, since it determines the income the buyer will actually receive. This includes rent review clauses, outgoings recovery, the term remaining and any options, and obligations the buyer takes on as landlord. Anyone buying a tenanted property should also understand how lease assignment works when a property sells, since the existing lease continues with the new owner rather than being replaced.

Building, Fire and Essential Services Compliance

Commercial buildings are subject to ongoing compliance obligations around fire safety systems, essential services maintenance and, depending on the property type, accessibility requirements. A buyer should request current compliance certificates and maintenance records rather than relying on a visual inspection, since non-compliance can carry real cost to rectify and may affect the ability to obtain occupancy certification for a change of use.

Environmental and Contamination Checks

Any property with a history of industrial, agricultural or automotive use warrants a closer look at environmental risk, including whether the site appears on a contaminated land register and whether previous approvals required remediation works. This is particularly relevant for warehouses, workshops, former service stations and rural-industrial sites, where contamination can affect both future development potential and finance approval.

GST and Going Concern Status

Commercial sales often raise GST questions that simply do not arise in residential conveyancing, including whether the sale qualifies as a GST-free going concern and whether GST withholding obligations apply at settlement. According to the Australian Taxation Office, purchasers of certain new residential and some commercial property may need to withhold an amount of GST and pay it directly to the ATO as part of settlement, as explained in its guidance on GST at settlement for purchasers. This is general information rather than tax advice, and buyers should confirm the GST treatment of their specific purchase with their accountant.

Finance, Insurance and Settlement Logistics

Commercial lending often takes longer to approve than residential finance and may require a valuation that accounts for rental income rather than comparable sales alone, so finance conditions in the contract need realistic timeframes. Buyers should also confirm insurance can be arranged before settlement, since commercial buildings insurance sometimes requires more detail than a standard home policy. Settlement itself is increasingly conducted electronically, and PEXA's service charter sets out what buyers and sellers can expect from that process on the day.

Bringing the Checklist Together

None of these checks are effective in isolation. Title issues can affect finance, zoning issues can affect insurance, and lease terms can affect the GST treatment of the sale. Commercial due diligence generally takes longer than a residential building and pest inspection, simply because there are more documents to review and, in many cases, external specialists to engage, so the due diligence or finance period negotiated in the contract should genuinely reflect the scope of checks a specific property needs, rather than a standard short timeframe designed for residential transactions. A conveyancer experienced in commercial transactions coordinates these threads so nothing falls through the gaps between the buyer's other advisers, and flags anything that needs a specialist opinion, such as an environmental consultant or town planner, before the cooling-off or finance period expires.