Rental-property mistakes in Germany: the checks to make before buying

The most expensive mistakes in a German rental purchase are usually made before the notary appointment, not after it. Paying a price the actual rent cannot support, relying on an advertised yield and signing without reading the owners' association's records account for many of the surprises first-time investors describe. Each can be reduced in the same way: ask for specific documents, read them before your offer is final, and put the right question to the right specialist.

This guide works through the common rental property investment mistakes in Germany in the order you would meet them, then sets out a document checklist you can use for any apartment in Berlin, Dresden or Leipzig.

An asking price is the seller's opening position, not evidence of value. Three sources give a better view.

• Transaction data. Each city's independent expert committee on property values (Gutachterausschuss) publishes market reports based on recorded sale prices rather than adverts. See the official indexes for Berlin and Leipzig; Dresden publishes its own report. Compare like with like: building age, size, condition and whether the apartment is let.
• The lender's valuation. Your bank values the property for lending purposes, and that figure can come in below the price. If it does, the loan may shrink and you need more of your own money. See how much money you need to buy a rental property.
• The rent. For a rental apartment, the rent you will actually receive is the strongest constraint on what the property is worth to you.

Our comparison of Berlin, Leipzig and Dresden sets the three cities side by side using the same definitions.

Listings often quote a gross yield based on a "potential" or "market" rent. The figures that matter are the rent in the current lease and the rules on how far it can rise.

Illustrative example: advertised versus achievable yield

Inputs: asking price €260,000; the advert quotes a market rent of €1,050 a month; the existing lease shows €820 cold rent; no stepped or index-linked rent clause; the rent has not changed for more than 15 months.

In an existing tenancy, the landlord can ask for the rent to rise to the local comparative rent (ortsübliche Vergleichsmiete), but by no more than 20 per cent within three years, or 15 per cent in designated areas (§ 558(1) and (3) BGB). The 15 per cent cap applies across Berlin until 10 May 2028 (KappGrV Berlin 2023) and in Dresden and Leipzig until 30 June 2027 (Saxon State Government). Even in the best case, and only if the local comparative rent supports it, this apartment reaches €943 in three years, not €1,050.

Advertised yields are also gross. They ignore the costs the owner carries, which is why the full calculation belongs in our rental property cash-flow guide.

When you buy a let apartment, the tenancy continues and you step into the seller's rights and obligations as landlord (§ 566 BGB). A sale neither ends the lease nor allows a new rent. Read the lease itself, not a summary, and check:

• The increase mechanism. A stepped rent (Staffelmiete) or index-linked rent (Indexmiete) follows its own clause, and the ordinary increase to the comparative rent is then excluded (§ 557a(2) BGB; § 557b(2) BGB).
• Payment history. Ask for evidence that the rent has been paid in full, with the tenant's personal details kept to what you need. Current arrears, or disputes about defects and rent reductions, change the numbers. See what happens if your tenant stops paying.
• The deposit. You take over the obligation to return the tenant's deposit (§ 566a BGB). The contract should provide for the seller to transfer it, and you should see where it is held.
• The next letting. If the apartment becomes vacant, the rent brake (Mietpreisbremse) generally limits the new rent to 10 per cent above the local comparative rent, with exceptions (§ 556d BGB). It applies across Berlin until 31 December 2029 (Berlin Senate) and in Dresden and Leipzig until 30 June 2027 (Saxon State Government).
• Social preservation areas. Berlin has designated 82 social preservation areas (soziale Erhaltungsgebiete, often called Milieuschutz), and Leipzig has several. In them, modernisation and structural changes need approval and can be refused (Berlin Senate; City of Leipzig). If your plan depends on upgrading the apartment, check this first.

The seller or agent must show you the energy certificate (Energieausweis) at the latest at the viewing and hand it over promptly after the contract is signed (§ 80(4) GModG). The Building Energy Act (GEG) was renamed the Building Modernisation Act (GModG) in July 2026. A certificate is valid for ten years and is either a demand certificate, based on the building's construction and systems, or a consumption certificate, based on recorded energy use (§ 79 GModG). Neither tells you whether the building meets current requirements or what works are coming.

Ask instead: How old is the heating system, and has the owners' meeting discussed replacing it? Are the roof, windows, façade or pipes due for renewal? Has the association commissioned a survey? For anything visible, such as damp, cracks or old wiring, arrange an inspection by a building surveyor (Bausachverständiger).

This matters because a used apartment is usually sold with the seller's liability for defects excluded. The seller cannot rely on that exclusion where they fraudulently concealed a defect or guaranteed a quality (§ 444 BGB). Otherwise, what you do not find before signing is generally yours to pay for.

In a building with several owners, you also join the owners' association (Wohnungseigentümergemeinschaft, or WEG). Its decisions and finances become yours; see what stays with you as a landlord. The documents follow from the law:

• Each year, the owners resolve on an economic plan (Wirtschaftsplan), which sets the monthly service charge (Hausgeld), and on the annual accounts (Jahresabrechnung). The administrator must also produce an asset report (Vermögensbericht) showing the reserves and main assets (§ 28 WEG).
• Building an adequate maintenance reserve (Erhaltungsrücklage) is part of proper administration (§ 19(2) no. 4 WEG), but the law sets no amount.
• Minutes must be taken of each meeting, and the administrator keeps a register of resolutions (Beschluss-Sammlung) (§ 24(6) to (8) WEG).
• Costs are shared by co-ownership share (Miteigentumsanteil) unless an agreement or resolution provides otherwise (§ 16(2) WEG).

Owners may inspect the administration documents (§ 18(4) WEG). As a prospective buyer, you cannot demand them yourself, so ask the seller to obtain them or to authorise the administrator to release them. A seller who will not is telling you something.

Two rules about money surprise many buyers. The seller's unpaid Hausgeld does not pass to you (BGH, V ZR 209/12, 13 September 2013). A special levy (Sonderumlage) can, even if it was resolved before you bought, when it falls due after you become owner (BGH, V ZR 257/16, 15 December 2017). If the minutes show a levy, ask for a contract clause allocating it to the seller.

Why an adequate-looking reserve does not rule out a special levy

Illustrative example: reserve versus planned roof and façade works

Inputs: 24 apartments; a reserve of €150,000 in the latest asset report; the minutes record a surveyor's estimate of €480,000 for roof and façade works; the apartment's co-ownership share is 42/1,000; costs are shared by co-ownership share; the whole reserve is used.

At about €6,250 per apartment, the reserve looks comfortable in a listing. Against the planned works, it covers less than a third. The shortfall may arrive as a special levy, a higher Hausgeld, a loan taken out by the association or postponed works. Associations rarely spend the entire reserve, so the real levy could be larger. Reading the minutes tells you which of these conversations the owners are already having, and how large your own property reserve needs to be.

Once you have a shortlist, Alpha Minoris's Buyer's Agent service can request these documents through the seller and agent and bring them together before you make an offer. That is particularly useful if you live elsewhere in Germany or abroad. The table shows what to look for and who can assess it.

A notarised purchase contract binds you whether or not your bank lends. You can withdraw because a loan is declined only if the contract contains a financing condition (Finanzierungsvorbehalt) (Sparkasse). Have a binding loan offer, based on the lender's valuation of this specific apartment, before the appointment. Check that you can pay the purchase costs and keep your reserves intact when the price falls due. For eligibility and loan structure, see mortgages with a Blue Card or temporary permit and 100% property financing.

The notary (Notar) is impartial. The notary reads the contract aloud and explains its legal effect but does not advise on whether the price or the building makes a good investment. Where the seller is a business and you buy as a consumer, the notary should normally make the intended contract text available two weeks before the appointment (§ 17(2a) BeurkG). Whether or not that rule applies, ask for the draft early and check:

• when the price is due and which conditions must be met first;
• when possession, rent and costs pass to you;
• who pays special levies and balancing payments already resolved;
• the transfer of the deposit and tenancy records;
• the exclusion of liability for defects, and any guarantees the seller gives.

If you are not confident reading German, arrange an interpreter in advance. Our guide to the notary appointment covers this in more detail.

• Price and rent evidence: you, using market reports and the lease; your lender, through its valuation.
• Building condition and energy: a building surveyor or energy consultant.
• Lease terms, WEG disputes and contract clauses: a lawyer specialising in tenancy or property law.
• Tax effects of the purchase: a tax adviser (Steuerberater).
• The contract's legal form and execution: the notary.

Alpha Minoris's Buyer's Agent service works alongside these specialists. It reviews properties with you, coordinates viewings and document collection, and coordinates financing, the notary and handover through to the keys. It does not replace the surveyor, the lawyer or the notary. A summary of a hundred pages of minutes, whether written by a person or by software, is a starting point for questions, not a substitute for technical inspection or legal advice.

What documents should I ask for before buying an apartment in Germany?

At minimum: the land register extract, the declaration of division, the lease, the last three years' owners' meeting minutes, the register of resolutions, the economic plan, the annual accounts, the asset report and the energy certificate. For a let apartment, add rent payment evidence and deposit details.

Do I have to pay the seller's unpaid Hausgeld?

No. The Federal Court of Justice has held that a buyer does not take over the previous owner's Hausgeld arrears. Special levies and other payments that fall due after you become owner are yours, even if the owners resolved them earlier, unless the contract allocates them to the seller.

How large should the maintenance reserve be?

The law requires an adequate reserve but sets no figure. Judge it against the building's age, condition and the works discussed in the minutes, not against a rule of thumb. A large reserve with major works ahead can still lead to a special levy.

Can I withdraw if my mortgage is declined after the notary appointment?

Only if the contract contains a financing condition. Without one, you remain bound to pay the price. Secure a binding loan offer before you sign.