In real estate transactions, properly conducted legal due diligence is not merely a legal formality, but a business decision-support tool. It enables the early identification of hidden risks that may lead to financial loss, performance issues or future disputes. A consciously structured due diligence process allows the contracting parties to make informed business decisions that reflect real market conditions.
Key Considerations
Legal due diligence in real estate transactions shares many similarities with the company law due diligence typically carried out in M&A deals. In both scenarios, the primary objective is to identify risks in advance — and, where necessary, mitigate them — in order to support decision-making and ensure that the transaction is legally sound.
However, while corporate due diligence focuses on corporate and financial data with a dynamic approach, real estate due diligence is predominantly static and centres on the full assessment of the property’s ownership, use, public-law and regulatory status.
In practice, comprehensive due diligence is performed far less frequently in real estate transactions — whether involving the transfer of ownership, the creation of use rights or other related arrangements — even though multiple legal areas and non-legal issues may be involved.
Risks in real estate transactions are diverse: unclear ownership, uncertain encumbrances, use rights, missing utility connections, or obligations stemming from condominium law may each give rise to future disputes. For a buyer, the greatest danger is discovering after paying the purchase price that the property does not meet contractual expectations or is unsuitable for its intended purpose. For the seller, inadequate securities, delayed performance or non-payment by the buyer pose significant risks, but a transaction closed with disputes or unresolved issues is equally undesirable.
This article outlines several aspects of due diligence based on the principle of reasonable professional care in real estate transactions.
Why Is Legal Due Diligence Necessary in Real Estate Deals?
The purpose of real estate due diligence is to ensure that the parties make well-founded decisions before, during or after a transaction.
For the buyer, it verifies whether the property is fit for the intended purpose and free of hidden legal obstacles.
For the seller, it ensures that the sale is lawful and capable of completion.
Legal due diligence is not a mere formality: it filters out risks that may later result in performance issues, disputes or financial losses.
Although most real estate transactions require the involvement of a legal representative, this statutory expectation alone does not guarantee that the parties’ long-term objectives — sometimes extending many years into the future — are properly assessed. A simple contract-drafting engagement does not, in itself, require the lawyer to explore the broader commercial context of the parties’ intentions.
Therefore, the first step should be assessing — jointly with the parties and other relevant experts (tax advisers, architects, engineers) — whether legal and professional due diligence is warranted, and informing the parties of the risks associated with omitting it.
What Does Legal Due Diligence Cover in Real Estate Transactions?
At first glance, the answer seems straightforward, as lawyers are generally obliged to inform their clients of the risks directly connected to a transaction. However, the scope of mandatory attorney information obligations is significantly narrower than what the market expects under a due diligence standard.
Legal due diligence is a structured examination aimed at identifying legal risks associated with a given transaction — such as a real estate purchase — ensuring legal compliance and supporting well-grounded decision-making. It involves a detailed review of the property’s ownership, use, contractual, regulatory and physical status, going far beyond the minimum statutory obligations of the acting attorney.
Due diligence is not merely administrative checking; it is a complex professional analysis.
Timing Matters: When Should Due Diligence Be Performed?
Due diligence may be recommended at three stages, depending on the client’s goals:
Pre-transaction due diligence
Mid-transaction (between signing and closing)
Post-transaction due diligence
1. Pre-transaction due diligence
Its function is to underpin the contemplated deal. This phase includes the review of contractual documentation, financing arrangements, leases, regulatory procedures (construction, environmental, etc.), and feasibility and coverage analyses. Findings may influence whether the deal proceeds at all — significant risks may lead to abandonment of the transaction or renegotiation of terms (e.g., purchase price adjustments, additional security, enhanced warranties).
2. Mid-transaction due diligence
Conducted between signing and closing, it focuses on fulfilment of closing conditions and compliance matters. Contracts often include rights or sanctions applicable if due diligence results are unfavourable (termination, deposits, penalties, purchase price adjustments, etc.).
3. Post-transaction due diligence
Its purpose is to support future transactions. A well-documented property file improves marketability, facilitates rapid decision-making and ensures long-term compliance with public-law obligations associated with ownership.
Complex Risk Assessment – When Legal Due Diligence Goes Beyond the Law
Although the object of the transaction is real estate, the starting point is always the party itself. Therefore, due diligence begins with:
client identification and verification;
examination of the legality and independence of the transaction;
assessment of purpose, seriousness, feasibility and proportionality.
After these checks, attention turns to the property itself. All documents potentially affecting the transaction must be obtained, especially from the seller. Identifying which documents are relevant is itself a complex task.
In addition to reviewing documents provided by the parties, the lawyer must obtain public-registry and official data: property register excerpts, company register data, building authority records, heritage protection information, Natura 2000 data, local zoning regulations, etc.
The core scope of legal due diligence includes:
verification of ownership;
encumbrances, claims and litigation;
third-party rights (pre-emption, lease, easements);
administrative, environmental and construction-related matters;
public charges and utility costs;
existence and capacity of utilities and road connections;
regulatory permits;
defects affecting usability;
energy certification and key technical matters;
presence and legal status of buildings and structures;
heritage, archaeological or environmental restrictions;
special statutory provisions affecting the site or intended activity.
Legal due diligence focuses on ownership, contractual and regulatory issues, but accurate risk assessment often requires consideration of non-legal factors: geographic conditions, physical and technical condition of buildings, engineering assessments, etc.
How Long Does Real Estate Due Diligence Take?
The timeframe depends on the transaction type, scope and the availability of documentation. Assuming that all requested data is provided, due diligence typically requires 4 to 25 hours of legal work per property.
However, external authorities may take several weeks to respond, meaning that the overall timeline may extend beyond the net working hours.
What Does Legal Due Diligence Cost?
Costs can usually be estimated based on the expected workload.
Fixed-fee arrangements are suitable when the scope is clear and data availability is predictable.
Hourly billing is often applied where uncertainty exists about the scope or complexity.
The Due Diligence Deliverable: A Written Report with Risk-Mitigation Proposals
The final product is a structured written report analysing each review area and proposing risk-management measures. The report is business-oriented and understandable to non-lawyers, supporting decision-makers in negotiations and transaction structuring.
How We Support Clients – Strategic, Not Only Legal, Assistance
Legal due diligence is not merely about identifying errors; it is a value-based decision-support methodology.
Its objective is the early detection of legal risks and enabling the parties to decide based on a clear, realistic legal environment.
Real estate transactions are multidisciplinary: law, taxation, architecture, engineering and finance all interact. Documentation, transparency and structured preparation create both safety and economic value.
At the Herdon Law Firm, our services stand out due to in-house-level legal support, a project-driven approach and single-point coordination of all professional inputs. We apply a complex methodology, jointly addressing real estate, corporate, administrative, construction and financial aspects. Where necessary, we conduct on-site legal assessments, enabling the evaluation of the transaction within its real-world context.
For us, due diligence is not a formal requirement but a strategic professional tool aimed at enabling safe and well-founded decisions for our clients.
Author:
Dr István Herdon LL.M.
Managing Partner, Attorney-at-Law, Specialist in Econimic Law
Herdon Law Firm