Reservation Agreement or Preliminary Contract: What Should a Buyer Sign?

This guide is general legal information, not legal advice. How the rules apply depends on your individual circumstances, contracts, documents and deadlines. If you need advice or representation, the matter should be assessed by a qualified Polish lawyer. Twoja Sprawa helps you organise the documents for that assessment.

Key points

• A Polish reservation agreement (umowa rezerwacyjna) only exists on the primary market (buying from a developer) and must be in writing or it is void — it temporarily takes a unit off the market, nothing more.
• A preliminary contract (umowa przedwstępna — roughly analogous to an English "contract to contract", though the legal mechanics differ) can be used on both the primary and secondary market, and can be signed as a simple written document or as a notarial deed. The form you choose determines what you can do if the other side backs out.
• Only a preliminary contract executed as a notarial deed lets you go to court and force the other party to complete the sale; a plain written preliminary contract only gives you a claim for damages.
• A deposit (zadatek) is legally different from an advance payment (zaliczka). If the other party defaults, a deposit lets the wronged party demand double the amount paid; an advance payment is normally just refunded at face value.
• The developer's reservation fee is capped by law at 1% of the unit's price as stated in the information prospectus, and in specific cases must be refunded twice over.
• Buying remotely from the UK raises the stakes on getting the form and wording right the first time — a badly drafted document is not always something a power of attorney or a follow-up letter can fix later.

Who this guide is for

• Poles living in the UK who plan to buy a flat, house or plot in Poland and have been sent a "reservation agreement" or a "preliminary contract" by an agent or a developer's sales office, without a clear sense of the difference.
• Mixed UK–Poland couples buying together in Poland, where one party doesn't speak Polish and is signing a Polish property document for the first time, possibly remotely or through an appointed attorney.
• Anyone who has already paid a deposit or advance payment and wants to understand what happens to that money if the deal falls through.
• Not for anyone looking for a ready-made contract template to sign without review — every draft contract should be checked individually by a lawyer or notary before you sign.

Contents

• Two different documents at two different stages
• The reservation agreement: what it is and when it appears
• The preliminary contract: form determines your rights
• Comparison table
• Deposit vs advance payment: the key difference in a dispute
• Signing remotely from the UK
• Primary vs secondary market: different protection regimes
• Documents you will need
• Common risks and mistakes
• Checklist
• Frequently asked questions
• Deadlines
• Related guides
• Sources

Two different documents at two different stages

A buyer working remotely from the UK usually meets these two terms for the first time when an agent or a developer's sales team sends over a draft "to sign" — and treats it as a formality to get through. That's a mistake. A reservation agreement and a preliminary contract serve different functions, require different forms, and carry different financial consequences if something goes wrong.

The reservation agreement (umowa rezerwacyjna) is the earlier step. It only exists on the primary market — buying a new-build unit directly from a developer — and precedes the developer agreement (umowa deweloperska) itself. Its purpose is to temporarily take a unit off the market in exchange for a small fee, so the developer doesn't sell it to someone else while you finalise financing. On its own, a reservation agreement does not oblige either side to complete the final purchase or sale — it functions more like a temporary option.

The preliminary contract (umowa przedwstępna) is a commitment to enter into a specific future contract (the "final" or "promised" contract) — usually the sale itself. It can appear on both the secondary market (buying from a private seller) and the primary market, although on the primary market the developer agreement itself often plays this role. Under the Polish Civil Code, a preliminary contract is defined as an agreement in which one or both parties undertake to conclude a specified contract in the future, and it must set out the essential terms of that future contract [F1, A3].

For a UK-based buyer, the critical point is that neither document is the same as the notarial deed that actually transfers ownership — that is always a separate, later step.

The reservation agreement: what it is and when it appears

On the primary market, the developer agreement (and any other agreement leading to transfer of ownership of a unit or house) may be preceded by a reservation agreement. Poland's developer protection act requires the reservation agreement to be in writing, on pain of being void — a plain written document is enough, but it must be in writing [F7, A3].

The reservation agreement obliges the developer to temporarily withdraw the unit from sale in favour of the person reserving it, and must specify, among other things, the unit's price, any reservation fee, and the period during which the unit is withheld from sale [F7, A3].

A few practical points a UK buyer should know:

• The reservation fee is capped by law. If the parties agree to one, it cannot exceed 1% of the unit's or house's price as stated in the information prospectus, and it is credited against the purchase price [F8, A3].
• The developer must transfer the fee into a dedicated housing escrow account within 7 days of signing the developer agreement [F8, A3].
• A double refund is due if the developer fails to perform its obligations under the reservation agreement, or amends the information prospectus without telling the person who reserved the unit [F9, A3].
• In other, justified cases where the developer agreement doesn't go ahead (for example, your mortgage application was declined), the reservation fee is refunded promptly, but at its nominal amount — no doubling [F9, A3].
• Before you sign a reservation agreement, the developer must give you the information prospectus (prospekt informacyjny) and its annexes — this document becomes an integral part of the later developer agreement, so it's worth reading before you pay any fee at all [F10, A3].

The reservation agreement is the lowest-risk of the documents discussed here — it's reversible, the fee is small and statutorily capped, and the developer act (Articles 29–34) directly governs its consequences [A3]. This is a good moment to double-check the developer and finalise your funding plan before you sign anything more binding.

The preliminary contract: form determines your rights

This is where most misunderstandings happen — partly because the legal consequences of a preliminary contract depend on the form in which it was signed, not on its title or length.

The weaker effect: plain written form

A preliminary contract does not need to be executed as a notarial deed even when it concerns real estate — a plain written form is legally valid [F2, A3]. The catch is that this gives you only the so-called weaker effect: if the obliged party evades signing the final contract, the other party can only claim compensation for the loss suffered from relying on the contract being concluded — they cannot force the other side to actually complete the sale [F2, A3].

In practice: if the seller walks away from a preliminary contract signed on plain paper, you can pursue damages (for example, costs you already incurred in connection with the transaction), but you cannot force them, through the courts, to sell you the property.

The stronger effect: notarial deed form

The stronger effect — the ability to go to court and demand that the final contract be concluded — is available ONLY where the preliminary contract meets the form requirements applicable to the final contract itself [F3, A3]. Because transferring ownership of real estate in Poland requires a notarial deed, a claim to force the sale can only succeed in court if the preliminary contract itself was executed as a notarial deed [F3, F6, A3].

Put differently: any contract obliging a party to transfer ownership of real estate, and any contract that actually transfers it, must be executed as a notarial deed or it is void — this is the general rule under Article 158 of the Civil Code, and it applies both to the final contract and to the "stronger" version of the preliminary contract [F6, A3].

This has a concrete, practical consequence for a UK-based buyer. If what matters to you is real certainty that the deal will close — not just the possibility of compensation if things go wrong — it is worth considering a preliminary contract executed as a notarial deed, despite the extra notarial cost and the need to arrange your (or your attorney's) presence in a Polish notary's office. This is a decision worth discussing with a lawyer or the notary handling the transaction, weighing the property's value against your level of trust in the other party.

Note for UK readers: a Polish umowa przedwstępna is not identical to an English exchange of contracts — it can, depending on its form, produce either a weak (damages-only) or a strong (specifically enforceable) effect, a distinction that doesn't map neatly onto English conveyancing practice.

Comparison table

Deposit vs advance payment: the key difference in a dispute

Whichever contract you sign — reservation agreement or preliminary contract — the question of a payment "to secure" the deal almost always comes up. The Polish–English terminology here matters directly to how much you could lose or recover.

A deposit (zadatek — distinct from an advance payment) gives the innocent party, in the event of the other side's default, the right to withdraw without setting an additional deadline and to keep the deposit; if the innocent party was the one who paid it, they can demand twice that amount back [F5, A3]. In concrete terms:

• If you, as the buyer, paid a deposit and you withdraw from the transaction without justification, the seller can keep the entire deposit.
• If the seller withdraws even though you are ready and willing to complete, you can demand a refund of double the deposit [F5, A3].
• If the contract is performed, the deposit is simply credited against the price [F5, A3].
• If the contract is terminated by mutual consent, or fails for reasons attributable to neither party (for example, a mortgage lender declined both parties independently), the deposit is refunded at its ordinary amount — no doubling [F5, A3].

An advance payment (zaliczka) has no separate statutory definition or penalty in the Civil Code comparable to a deposit — its consequences (ordinary refund, no doubling) simply follow from the absence of a special rule, treating it as a plain part-payment [F5, A3]. This means that if the deal falls through, an advance payment is, as a general rule, returned at its nominal amount — no penalty for the party at fault, and no premium for the wronged party.

Why this matters when buying remotely. If you're negotiating from a distance — by phone or email — and the other side (seller, agent, or developer) drafts the contract, pay close attention to which word actually appears in the document: zadatek or zaliczka. This is not a stylistic choice — it determines how much you could recover (or lose) if things go wrong, at a moment when you may be thousands of miles from the property and unable to negotiate last-minute changes in person.

Note: this Polish deposit/advance distinction has no exact equivalent in England & Wales practice; treat the wording of the Polish contract as controlling, not any assumption carried over from a UK transaction.

Signing remotely from the UK

A buyer who cannot fly over for every signature has several practical options — but which ones are available depends on which document, and in which form, you're signing.

The reservation agreement (written form) is relatively easy to sign remotely — for example by post, courier, or, if the developer allows it, electronic signature. It's worth confirming the technical arrangements directly with the developer's sales office before you start the process.

A preliminary contract in plain written form can similarly be signed by post — but, as above, it only gives you the "weaker effect" (a claim for damages, not a right to force the sale) [F2, A3].

A preliminary or final contract executed as a notarial deed must be signed in person at a Polish notary's office, or by an appointed attorney (pełnomocnik — the person holding your power of attorney) acting under a power of attorney that itself takes the form of a notarial deed. This is the same mechanism used for the final ownership-transfer deed, and it allows a buyer who cannot fly over for every step of the transaction to run it remotely from the UK while preserving the full legal form.

Practical pointers for a remote buyer:

• Confirm in advance whether the notary handling your case will accept a power of attorney prepared in the UK (UK notary public plus apostille) — practice varies between notarial offices.
• If you don't speak Polish, expect a sworn (certified court) translator to be required at the notarial act — the notary is obliged to translate the deed personally or with the help of a sworn translator if a party does not know Polish and no translation was attached to the act [F26, A3].
• At a party's request, the notary may also perform the act in a foreign language, using their own documented knowledge of it or a translator's assistance [F25, A3] — worth asking about early when booking a date.
• The power of attorney should precisely describe the transaction: the property details, a maximum price, and authority to sign the specific contract in question (reservation, preliminary, developer, or ownership-transfer) — an overly general document may be rejected by the notary.

For more on the mechanics of powers of attorney, apostille and translations for a remote purchase, see Buying Property in Poland Remotely from the UK: Power of Attorney, Apostille and Translation.

If you'd like someone to check the documents before you sign, Twoja Sprawa helps you organise the transaction paperwork ready for review by a Polish lawyer — you can request a free initial assessment.

Primary vs secondary market: different protection regimes

It's worth remembering that the primary market (buying from a developer) and the secondary market (buying from a private individual or another business) operate under different sets of rules:

• On the primary market, the transaction is governed by the developer protection act — with an escrow account, the Developer Guarantee Fund (Deweloperski Fundusz Gwarancyjny), a mandatory information prospectus, and a formalised handover procedure with defect reporting [F11, F12, F16, A3].
• On the secondary market, there is no escrow account and no Developer Guarantee Fund — the general statutory warranty (rękojmia) under the Civil Code applies, under which the seller is liable to the buyer for physical and legal defects in the property sold, unless liability was effectively limited or excluded in the contract [F21, A3].
• Provisions of a developer agreement that are less favourable to the buyer than the developer act are void — the act's own provisions apply instead, giving the buyer statutory protection not available in this form on the secondary market [F19, A3].
• The notary executing a developer agreement's notarial deed is obliged to file, ex officio, an application to enter the buyer's claim for transfer of ownership in the land register — on the secondary market, entering a claim arising from a preliminary contract usually requires a separate application, and the exact procedure needs confirming with the notary.

Documents you will need

Before signing a reservation agreement or a preliminary contract, a buyer working remotely from the UK should have ready (or in progress):

• Proof of identity / passport (for verification by the notary or the developer).
• The draft contract, reviewed well in advance of the signing date.
• The developer's information prospectus and its annexes (mandatory on the primary market) [F10, A3].
• The property's land register (księga wieczysta) number, for you to verify independently online.
• If signing through an appointed attorney: a power of attorney in the form required for that specific act (notarial, if the contract itself must be a notarial deed).
• Evidence of the source of the funds used for the deposit/advance payment/reservation fee, in case the notary or a bank asks under anti-money-laundering procedures.

Common risks and mistakes

1. Treating the reservation agreement and the preliminary contract as the same document — confusing their function and effect leads to mistaken expectations about what can actually be enforced.
2. Signing a preliminary contract in plain written form for a high-value transaction without realising that, in a dispute, you only have a claim for damages, not a claim to force the sale [F2, A3].
3. Not checking whether the contract uses the word zadatek or zaliczka — this determines whether you can demand double the amount if the other side defaults [F5, A3].
4. Paying a deposit or reservation fee before checking the land register and the property's legal status.
5. An overly generic power of attorney, drafted "to cover everything" — a notary may reject it as insufficient for the specific act required.
6. No time buffer for sworn translation, apostille, or a translator's attendance at the notarial act — deadlines slip easily in remote transactions.
7. Relying solely on verbal assurances from an agent or developer about refund conditions, instead of the exact wording of the signed contract.

Checklist

• [ ] I've checked whether the document I'm about to sign is a reservation agreement or a preliminary contract — and in what form (written or notarial deed).
• [ ] I know whether the transaction is on the primary (developer) or secondary (private seller) market, because the protection regime differs.
• [ ] I've checked in the draft contract whether the payment is called a "deposit" (zadatek) or an "advance payment" (zaliczka), and I understand the difference in consequences.
• [ ] I've checked the property's land register online before planning any payment.
• [ ] (Primary market) I received the developer's information prospectus before signing the reservation agreement.
• [ ] I know whether the transaction requires a notarial deed, and I've confirmed with the notary whether I'll sign in person or through an appointed attorney.
• [ ] If acting through an appointed attorney, the power of attorney has the right form and precisely describes the transaction.
• [ ] I've allowed time for sworn translation / apostille / a translator's attendance at the deed, if needed.
• [ ] I have evidence of the source of funds ready in case the notary or bank asks.
• [ ] I had the draft contract reviewed by a lawyer or notary before signing, not after.

Frequently asked questions

Does a reservation agreement oblige me to buy the flat? Not in the legally enforceable sense that a notarial-deed preliminary contract does. The reservation agreement primarily obliges the developer to temporarily withdraw the unit from sale; if you withdraw in justified circumstances, you typically lose at most the reservation fee at its nominal amount, not double [F9, A3]. The precise consequences depend on the specific contract's wording — read it before signing.

Does a preliminary contract always have to be signed at a notary's office? No — the Civil Code allows a plain written form even for real estate [F2, A3]. Notarial form isn't mandatory, but without it you cannot go to court to force the sale if the other side backs out — you're limited to a claim for damages [F2, F3, A3].

What happens if the seller backs out of a preliminary contract where I paid a deposit? If the seller, being obliged to complete, evades signing the final contract, and you paid a deposit, you can, as a general rule, demand a refund of double the deposit [F5, A3]. If instead you paid an advance payment (zaliczka) rather than a deposit, the doubling mechanism generally does not apply, because the Civil Code does not regulate advance payments this way [F5, A3]. The final answer depends on the specific contract and the circumstances.

How much is a developer's reservation fee in Poland? If the parties agree to one, the reservation fee cannot exceed 1% of the unit's or house's price as stated in the information prospectus [F8, A3]. The developer must transfer it into a dedicated housing escrow account within 7 days of signing the developer agreement [F8, A3].

Can I sign a preliminary contract through a power of attorney while I'm in the UK? Yes, this is generally possible — including for a notarial-deed contract — provided the power of attorney has the right form and scope. The requirements for a power of attorney prepared abroad (for example, by a UK notary public with an apostille) are worth confirming directly with the notary handling the transaction in Poland.

If my Polish isn't strong, can I sign the notarial deed without a translator? The notary is obliged to translate the deed personally or with a sworn translator's help if a party doesn't know Polish and no translation into a language they know was attached to the act [F26, A3]. In practice, for transactions involving non-Polish speakers, having a sworn translator present is standard.

How does a developer's warranty differ from the secondary-market warranty? Once the handover procedure is complete, a buyer from a developer benefits from the same statutory warranty (rękojmia) under the Civil Code — including the 5-year period for real estate — as a buyer on the secondary market [F18, F22, A3]. The difference lies in the earlier stage: the primary market has an additional, formalised handover procedure, with defect reporting and an independent expert's opinion if there's a dispute [F16, F17, A3].

Deadlines

• Claims under a preliminary contract expire one year after the date on which the final contract was supposed to be concluded [F4, A3]. If a court dismissed a claim to conclude the final contract, the claims expire one year after that judgment becomes final [F4, A3].
• Deadline for the final contract: if no date was set in the preliminary contract, and none is set within one year of signing it, the final contract can no longer be demanded [F1, A3].
• Withdrawal from a developer agreement is available to the buyer in a closed list of 12 situations set out in the developer act; in most cases the withdrawal period is 30 days from signing, and where the developer is late transferring ownership, the buyer must first give the developer an additional 120-day period [F20, A3].
• Warranty for physical defects in real estate — 5 years from the date the property is handed over to the buyer; the claim for repair or replacement expires one year after the defect is discovered, but for a consumer this one-year period cannot end before the underlying 5-year period does [F22, A3].

Related guides

• How to Buy Property in Poland: A Step-by-Step Guide for UK Buyers
• The Polish Notarial Deed: What Foreign Property Buyers Need to Know
• Buying a New-Build Property from a Developer in Poland
• Buying Property in Poland Remotely from the UK: Power of Attorney, Apostille and Translation
• Umowa przedwstępna kupna nieruchomości – co sprawdzić (in Polish) — /blog/baza/silos-11-nieruchomosci/zakup-nieruchomosci/umowa-przedwstepna-kupna-nieruchomosci-co-sprawdzic
• Zadatek przy kupnie mieszkania – kiedy zwracać (in Polish) — /blog/baza/silos-11-nieruchomosci/zakup-nieruchomosci/zadatek-przy-kupnie-mieszkania-kiedy-zwracac

Przeczytaj po polsku: Umowa rezerwacyjna czy przedwstępna – co powinien podpisać kupujący?

Sources

• Civil Code (Kodeks cywilny), consolidated text Dz.U. 2026 poz. 795, Arts. 158, 389–396, 556–576 — Chancellery of the Sejm / ISAP — https://isap.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=WDU19640160093
• Act of 20 May 2021 on the Protection of Rights of a Buyer of a Residential Unit or Single-Family House and on the Developer Guarantee Fund, consolidated text Dz.U. 2026 poz. 888 — Chancellery of the Sejm / ISAP — https://isap.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=WDU20210001177
• Law on the Notarial Profession (Prawo o notariacie) of 14 February 1991, consolidated text Dz.U. 2026 poz. 614 — Chancellery of the Sejm / ISAP — https://isap.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=WDU19910220091
• Act of 6 July 1982 on Land and Mortgage Registers and Mortgage, consolidated text Dz.U. 2025 poz. 341 — Chancellery of the Sejm / ISAP — https://isap.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=wdu19820190147

Information verified on: 11 July 2026.