Contractual Requirements for B2B Commercial Leases in Poland

Commercial leases in Poland (covering offices, retail units, warehouses, and other non-residential premises) are governed by the general lease provisions of the Polish Civil Code (Kodeks Cywilny — KC), specifically Articles 659 to 692, which has been in effect since 1 January 1965. Unlike residential leases, which benefit from extensive statutory protection under the Act on the Protection of Tenants' Rights (2001), B2B commercial leases operate primarily on the principle of freedom of contract — parties may agree on almost any commercial terms, provided they do not violate mandatory provisions of law or public policy.

1. Form Requirements: When is Written Form Mandatory?

Article 660 of the Civil Code establishes the critical threshold:

• A lease agreement for a term of up to one year may be concluded verbally or in any form (though written is strongly advisable in practice).
• A lease agreement for a term exceeding one year must be concluded in writing. This is a mandatory statutory requirement.

Statutory consequence of failing the written form requirement: If a commercial lease intended for a fixed term (e.g., 3 years) is not executed in writing, it is deemed by law to be a lease for an indefinite term (czas nieoznaczony). This is a standard statutory default under Art. 660 KC rather than a legal penalty; however, it allows either party to terminate the lease with statutory notice periods, potentially removing the fixed-term security sought by the parties.

2. The 30-Year Maximum Fixed-Term Limit for B2B Leases (Art. 661 § 2 KC)

Article 661 § 2 of the Civil Code imposes a ceiling on fixed-term commercial leases between entrepreneurs (przedsiębiorcy):

• A B2B lease agreed for a fixed term exceeding 30 years is, after the 30-year period expires, treated as if it were concluded for an indefinite term.
• This rule (introduced into § 2 for B2B relations) is specifically designed to prevent indefinite binding of property in long-term commercial arrangements and applies only to leases between business entities.

In practice, most commercial leases run for 5 to 15 years. The 30-year cap is primarily relevant for large infrastructure or industrial leases. Parties wishing to continue a relationship beyond 30 years should enter into a new fixed-term agreement at that point.

3. Electronic Signatures and the "Written Form"

With the growth of digital contracting, it is essential to understand Poland's e-signature requirements for B2B commercial leases under the eIDAS Regulation and the Civil Code:

• Qualified Electronic Signature (QES): Under Article 78^1 KC, a QES — a digital signature issued by a qualified trust service provider — is legally equivalent to a handwritten signature. It is the only electronic form that satisfies the "written form" requirement.
• Documentary Form (Advanced Signatures & ePUAP): Signatures that identify the person but are not "qualified" (including the Trusted Profile/ePUAP and standard DocuSign/HelloSign levels) satisfy the documentary form (forma dokumentowa — Art. 77^2 KC).
• Risk of Indefinite Conversion: While ePUAP or simple e-signatures are legally binding for the contract itself, they do not satisfy the written form requirements of Art. 660 KC. Consequently, any lease longer than one year signed this way will be converted by law into an indefinite-term lease.

Landlords should prioritize the use of QES to ensure the stability of fixed-term lease durations.

4. Key Commercial Lease Clauses

Well-drafted Polish commercial leases typically include the following provisions:

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