Environmental due diligence for property, M&A, refinancing and lease transactions across Australia.
Environmental due diligence is what stops a contamination problem becoming a deal problem. iEnvi advises and works directly with property owners, buyers, sellers, property managers, legal teams, financiers and lenders, brokers, valuers and corporate parties on environmental risk attached to land, leases and transactions across Queensland, New South Wales, Victoria and South Australia.
Our work runs from desktop review of a single property through to multi-asset portfolio EDD for M&A and refinancing. Every engagement is led by a Certified Environmental Practitioner (CEnvP) — and scoped to answer the commercial question the deal actually depends on, not just describe site history.
Every EDD is shaped, scoped, reviewed and signed off by a Certified Environmental Practitioner. The senior name on the report is the senior name who actually did the work.
iEnvi engages directly with property owners, property managers, legal counsel, financiers and corporate teams. Reports are written for the audience that needs the answer.
An EDD can be extended with limited soil, groundwater or vapour sampling at locations identified during the desktop phase, kept inside the same engagement.
On contested or time-sensitive acquisitions, iEnvi has mobilised to site within three business days. The technical rigour does not change. The pace does.
Common reasons clients commission an environmental due diligence.
Clients engage iEnvi for EDD when an environmental issue starts to influence value, programme, lender confidence, lease obligations or post-completion liability. The trigger is usually one of these.
Pre-acquisition due diligence
Buyer-side EDD ahead of a property purchase, asset acquisition or share-sale transaction where contamination, regulatory exposure, UPSS, asbestos or groundwater risk could affect price, structure, timing or post-completion liability.
Pre-sale and divestment
Seller-side EDD that gets ahead of buyer enquiries, identifies issues that need resolving (or disclosing) before going to market, and stops contamination findings derailing the deal in the final week of negotiations.
Refinancing and lender requirements
Environmental reports requested by banks, financiers or insurers as a condition of refinancing, loan extension or new facility. iEnvi reports are written in a form that satisfies lender review without rework.
M&A and corporate transactions
Multi-asset and portfolio EDD for mergers, acquisitions, divestments and corporate restructures, with a clear technical view of environmental liability across the asset base for legal, financial and risk advisors.
Start and end of lease investigations
Baseline environmental reports at lease commencement that lock in the liability boundary, and verification reports at lease exit that support make-good obligations and protect both tenants and landlords.
Pre-development and feasibility
Early-stage environmental risk advice before a planning lodgement, masterplan commitment or major capital decision. The aim is to surface contamination, ecology and approval risk before money is committed.
What an iEnvi environmental due diligence actually covers.
The default iEnvi EDD is a desktop and walkover assessment built around an explicit conceptual site model and a clear next-step recommendation. Where the matter calls for it, the same engagement extends into limited intrusive sampling.
Site history and regulator search
Aerial photography review, historical title and land-use search, regulator database checks (NSW EPA contaminated land record, EPA Victoria Priority Sites Register, Queensland EMR/CLR, SA EPA records), licensed activity history and known contamination disclosures.
Walkover and conceptual site model
Site inspection by a senior practitioner, photographic record, identification of UPSS, hardstand, bunds, fill, landscaping, asbestos-sensitive areas and hydrogeological setting, and development of a defensible conceptual site model.
Contamination risk assessment
Risk-based interpretation against the relevant land-use guideline framework, an explicit view on whether further investigation is warranted, and a clear next-step recommendation that addresses the actual deal question.
Targeted preliminary sampling
Limited soil, groundwater or vapour sampling at locations identified during the desktop phase. Run inside the same EDD engagement, scoped to the specific risk hypotheses, with NATA-accredited laboratory analysis.
UPSS, asbestos and landfill gas
Targeted assessment of underground petroleum storage system risk, asbestos in soil exposure, landfill gas migration where the site adjoins a former tip, and acid sulfate soil exposure on coastal and estuarine sites.
Defensible, transaction-ready reporting
Reports structured for the audience that needs them — buyers, sellers, lenders, lawyers and corporate teams — with clear findings, residual risks, recommended next steps and supporting appendices.
Phase 1 and Phase 2 environmental due diligence in Australia.
Internationally, environmental site assessments are commonly described as Phase 1 and Phase 2 ESAs. In Australia the same work runs under PSI and DSI terminology aligned to ASC NEPM 2013 and state guidelines, and iEnvi reports are written so they read consistently for both Australian and international audiences.
Phase 1 EDD (PSI-equivalent)
Desktop review, site history, regulator searches, walkover and a conceptual site model. The output is a structured assessment of whether environmental issues are likely, what they are, and whether further intrusive investigation is needed.
Phase 1 work aligns with the ASTM E1527-21 framework where a transaction has international or institutional reporting requirements, while remaining grounded in Australian regulatory practice.
Phase 2 EDD (DSI-equivalent)
Intrusive investigation: soil and groundwater sampling, vapour assessment where relevant, contamination delineation, validation and reporting against the applicable assessment criteria. Phase 2 is commissioned when Phase 1 identifies issues that require sampling to resolve.
iEnvi can deliver targeted Phase 2 work as a stand-alone engagement, or as a continuation of an in-flight EDD where preliminary sampling has triggered a wider investigation need.
EDD for sites with underground petroleum storage systems and fuel infrastructure.
Underground petroleum storage systems and other fuel infrastructure account for a significant share of contaminated land issues that surface during EDD. Former service stations, depots, fleet and bus operations, manufacturing sites with diesel generators, and any property with a history of fuel storage all sit in this category.
What UPSS-focused EDD covers
Review of historical tank registers and decommissioning records, identification of fill points, vent stacks and pump infrastructure, search for historical validation reporting and compliance evidence under AS 4976 and applicable state UPSS guidance, walkover for surface evidence of leakage or inadequate abandonment, and recommendation on whether targeted soil and groundwater sampling is warranted.
Common UPSS findings in EDD
Residual total recoverable hydrocarbons (TRH) and BTEX in soil, light non-aqueous phase liquid (LNAPL) on groundwater, vapour intrusion risk to occupied buildings, abandoned in-situ tanks without adequate validation evidence, and UPSS infrastructure that does not match the site’s documented history. Each of these can affect deal value if not surfaced early.
How iEnvi runs UPSS work in EDD
Senior practitioner review of available compliance and validation history, targeted walkover by a CEnvP, optional sampling around former tank locations, fill points and groundwater monitoring wells where present, and a clear technical view on whether further investigation, remediation or regulator engagement is warranted.
Standalone UPSS services
Beyond EDD, iEnvi delivers full UPSS investigation, validation, in-situ abandonment, foam-filling and decommissioning support. Where an EDD identifies UPSS issues that need closing out, the same senior team carries the work into resolution. View petroleum and underground tank services.
Start-of-lease and end-of-lease environmental investigations.
Leases on industrial, manufacturing, automotive, fuel-handling, depot, agricultural and contamination-sensitive sites benefit from environmental investigation at both ends of the term. The work locks in a defensible liability boundary and protects both sides at lease exit.
Start-of-lease baseline investigations
A baseline environmental condition report at lease commencement documents the state of the site before the tenant takes occupancy. This becomes the reference against which any future contamination is compared, and limits the tenant’s exposure to legacy issues that pre-date the lease.
Typical scope includes a site walkover, historical review, photographic record, targeted soil sampling at known activity zones (fuel storage, chemical bunds, washdown areas, workshop floors), and a clear factual record of pre-lease condition.
End-of-lease verification investigations
At lease exit, a verification investigation compares current site condition against the baseline and against the tenant’s make-good obligations. Findings support deposit recovery, dispute resolution and clean-handover certification for both tenant and landlord.
Where contamination is identified, the same engagement can extend into delineation, remediation strategy and closure planning — kept under a single CEnvP-led team rather than handed off between consultants mid-process.
How EDD intersects with state duty-to-report obligations.
Each Australian state imposes a regulatory duty to notify the relevant authority where contamination meets defined thresholds. EDD often intersects directly with these obligations, particularly when investigation findings cross a notification trigger.
Contaminated Land Management Act 1997
Section 60 imposes a duty to notify the NSW EPA where contamination meets thresholds for “significant risk of harm”. iEnvi advises whether findings approach the threshold and supports defensible reporting where required.
Environment Protection Act 2017
The General Environmental Duty and contaminated land notification provisions sit alongside Victoria’s EPA-administered environmental audit framework. EDD findings are tested against these obligations.
Environmental Protection Act 1994
Notifiable activity duties apply where land has been used for activities listed under the Act, with EMR and CLR registration consequences. iEnvi advises on whether disclosures and registration steps are required.
Environment Protection Act 1993
South Australian duty-to-report obligations apply to listed activities and contamination meeting defined criteria, supported by site contamination assessment guidance issued by the SA EPA.
Issues that commonly surface in environmental due diligence.
Some findings appear repeatedly across iEnvi’s EDD engagements. Knowing what is plausible at a particular site type allows the desktop phase to be focused, and the optional sampling programme to be efficient.
Historical fill and unknown imported material
Imported fill of unknown provenance, particularly on infill development sites, with potential for asbestos, hydrocarbons, heavy metals and other historical contamination that can affect waste classification and reuse pathways.
UPSS legacy and petroleum hydrocarbons
Residual TRH, BTEX, naphthalene and LNAPL on former service station, depot, manufacturing and fleet sites. Often not visible on the surface but material to deal value where vapour or groundwater pathways exist.
Asbestos in soil
Bonded and friable asbestos in fill and surface soils, particularly on sites with demolition history, peri-urban farming sites and properties that have undergone informal site preparation.
PFAS at industrial and fire-training sites
Per- and polyfluoroalkyl substances at industrial sites, airfields, fire-training grounds and properties downgradient of historical sources. Increasingly relevant to investor and regulator review even where standards continue to evolve.
Acid sulfate soils
Coastal, estuarine and floodplain sites where disturbance of acid sulfate soils can drive acidification, metal mobilisation and downstream water quality impacts. Material to development feasibility and approval pathway.
Landfill gas migration
Sites adjoining former municipal landfills, sportsfields built on closed tips, and properties downgradient of legacy waste cells, where methane and carbon dioxide migration through soil into structures is a measurable risk.
EDD that keeps pace with the transaction.
Environmental due diligence sits on the critical path of most property and corporate transactions. iEnvi is structured around that reality. The senior practitioner involved at scoping is the same practitioner involved at sign-off, and the team is small enough to mobilise quickly without sacrificing technical rigour.
Rapid mobilisation when the deal demands it
On contested or time-sensitive acquisitions, iEnvi has commenced fieldwork within three business days of instruction, with preliminary findings delivered before the contract has gone unconditional. This has supported buyers to negotiate liability, sellers to address findings before market, and lenders to release facilities on schedule.
Direct engagement with the deal team
iEnvi communicates directly with the client, property manager, legal counsel, financiers and other deal advisors as the matter requires. The same senior practitioner explains findings to the buyer, addresses lender review queries, and supports counsel through any liability negotiation.
What clients need from a due diligence consultant — and what iEnvi is built to deliver.
CEnvP-led from scoping to sign-off
Every EDD is shaped, reviewed and signed off by a Certified Environmental Practitioner. Senior oversight is structural, not nominal, and the same practitioner stays close to the matter through to closure.
Contamination, groundwater, ecology and asbestos under one team
Contaminated land, hydrogeology, ecology, asbestos in soil and environmental management sit within one operating business, so deal-stage findings are not handed between disciplines or sub-consulted away.
Talking to property, legal, finance and corporate parties
iEnvi engages directly with property owners, property managers, in-house and external legal counsel, financiers, lenders, brokers, valuers and corporate stakeholders. Reports are written for the audience receiving them.
Reports built to withstand regulator, auditor and lender scrutiny
EDD reporting is structured to support legal opinion, lender review, regulator engagement and, where the matter calls for it, expert witness work. iEnvi practitioners include a CEnvP Site Contamination Specialist and NSW-listed Site Contamination Specialists.
Work that has shifted cost, programme and risk on real transactions.
Questions clients raise about environmental due diligence.
When in the deal timeline should EDD start?
As early as practical. A short desktop screen can be completed quickly and is often enough to flag whether a fuller Phase 1 EDD is warranted, what the realistic risk profile looks like, and where price or contract structure may need to take environmental factors into account.
Is a desktop review enough, or do I need sampling?
For many lower-risk sites, a well-scoped Phase 1 desktop EDD is sufficient. For sites with UPSS history, asbestos exposure, manufacturing legacy, fill of unknown origin or sensitive intended use, sampling is usually needed to resolve specific risk questions identified at the desktop phase.
Can sampling be done inside the same EDD engagement?
Yes. iEnvi runs targeted preliminary sampling programmes inside the same EDD engagement when the desktop phase identifies specific risk hypotheses that need sampling to resolve. This avoids the cost and lag of scoping a separate detailed site investigation.
What is the difference between EDD and a contaminated land assessment?
An EDD is framed around a transaction or commercial decision. A contaminated land assessment is framed around the contamination itself. The work overlaps technically — but EDD reporting answers the deal question, while a contaminated land assessment answers the regulatory question.
Should I commission a baseline report before signing a lease?
If the site has industrial, automotive, fuel-handling, agricultural or contamination-sensitive history — yes. A start-of-lease baseline locks in the liability boundary and limits a tenant’s exposure to legacy issues that pre-date occupancy.
What does an end-of-lease environmental investigation cover?
End-of-lease investigations compare current site condition against the baseline and against the tenant’s make-good obligations. They support deposit recovery, dispute resolution and clean-handover certification for both tenant and landlord.
What if contamination is found mid-deal?
It is rarely fatal to a transaction if it is surfaced and quantified in time. iEnvi can extend an in-flight EDD into delineation, risk assessment and remediation strategy, and supports counsel through liability negotiation, vendor warranty drafting or price-adjustment discussions.
Does iEnvi work to deal timetables?
Yes. The team is structured to mobilise quickly. iEnvi has commenced fieldwork within three business days of instruction on contested acquisitions, with preliminary findings delivered before the contract has gone unconditional.
Does an EDD discharge a duty to report contamination?
Not by itself. Where EDD findings approach a state notification threshold, iEnvi advises on the practical pathway — including whether reporting is required, who is best placed to make the notification, and how to manage regulator engagement alongside the transaction.
Need environmental due diligence on a live transaction?
iEnvi delivers senior CEnvP-led EDD for property purchases, sales, refinancing, lease bookends, M&A and corporate matters across Queensland, New South Wales, Victoria and South Australia. Talk to a senior practitioner about scope, timing and the next step on your deal.