BGH 1 July 2026 (VIII ZR 50/23; 125/23; 211/23): rent‑brake exceptions, tenant information claims, and proof landlords must keep

What the BGH decided on 1 July 2026

Germany’s Federal Court of Justice (BGH) decided three rent‑brake cases on 1 July 2026. Together they clarify: when a unit is “newly created” and thus exempt from the rent brake; what information tenants may sue to obtain; and how a landlord must prove exceptions such as “previous rent” or “comprehensive modernisation.” The cases are VIII ZR 50/23, VIII ZR 125/23 and VIII ZR 211/23. ([anwalt24.de](https://www.anwalt24.de/urteile/bgh/2026-07-01/viii-zr-50_23))

The rent brake (Mietpreisbremse) limits initial rents in designated areas to the local reference rent plus 10 %, but the Civil Code contains key exceptions in Sections 556e to 556g BGB. Your financing model and legal risk depend on these details. ([gesetze-im-internet.de](https://www.gesetze-im-internet.de/bgb/?utm_source=openai))

Exception for newly created units: re‑enabled housing counts

In VIII ZR 50/23 the BGH held that the “newly created unit” exception in Section 556f sentence 1 BGB also covers existing rooms that had become uninhabitable (e.g., due to damage) and were permanently restored for residential use with substantial construction effort, provided the unit was first used and let after 1 October 2014. This extends the exemption beyond classic new‑builds to certain heavy conversions that add back housing that did not exist on the market. ([anwalt24.de](https://www.anwalt24.de/urteile/bgh/2026-07-01/viii-zr-50_23))

The Court emphasised “substantial construction effort.” In practice, courts often assess substance by analogy to housing‑law standards for “comprehensive modernisation,” looking at both quality of result and scale of cost. Case law commonly uses a cost benchmark of roughly one third of the cost of a comparable new‑build (excluding land) as an indicator of “wesentlicher Bauaufwand.” Expect expert evidence if the figures are close. ([dejure.org](https://dejure.org/dienste/vernetzung/rechtsprechung?Aktenzeichen=VIII+ZR+50%2F23&Datum=01.07.2026&Gericht=BGH&utm_source=openai))

Important limits remain. Simple repairs or minor alterations do not qualify. And changes like splitting or merging existing apartments are mentioned in the legislative materials as not intended to trigger the new‑unit exemption. Landlords must show that the work produced genuinely additional, market‑relevant housing. ([anwalt24.de](https://www.anwalt24.de/urteile/bgh/2026-07-01/viii-zr-50_23))

Tenant information claims and case value

In VIII ZR 211/23 the BGH confirmed that a tenant can sue for information needed to verify rent‑brake exceptions under Sections 556e and 556f BGB. Crucially, this claim cannot be refused on the ground that the landlord is (for now) procedurally barred from invoking an exception due to a missed pre‑contract disclosure. Tenants retain a right to know the factual basis of any claimed exception. ([app.omnilex.ai](https://app.omnilex.ai/de/sources/court-decision/de-rii--kore300412026/bgh-2026-07-01-viii-zr-21123?utm_source=openai))

The judgment also addresses valuation for court fees when tenants seek a declaration reducing rent under the rent brake. Where the version of Section 41(5) GKG did not yet expressly cover such cases, the Court assessed the value by reference to the 42‑times or 3.5‑times annual excess, aligning with earlier case law. This matters for litigation budgeting. ([dejure.org](https://dejure.org/dienste/vernetzung/rechtsprechung?Aktenzeichen=VIII+ZR+211%2F23&Datum=2026-07-01&Gericht=BGH))

For investors, the takeaway is operational: organised records shorten disputes. If you intend to rely on any exception later, be ready to disclose documents enabling the tenant and court to verify it. ([app.omnilex.ai](https://app.omnilex.ai/de/sources/court-decision/de-rii--kore300412026/bgh-2026-07-01-viii-zr-21123?utm_source=openai))

Vormiete under Section 556e BGB: what really carries over

In VIII ZR 125/23 the BGH clarified how to determine the “previous rent” (Vormiete) that a landlord may carry over under Section 556e(1) BGB. Decisive is whether the previous rent was materially lawful under the rent‑brake rules—not whether the landlord had perfectly complied with pre‑contract disclosure in the previous tenancy. A disclosure breach in the prior tenancy does not permanently reduce the amount of Vormiete available in the next tenancy; material legality governs. The case was remanded because the lower court had not yet made findings on the actual modernisation measures justifying the prior rent. ([anwalt24.de](https://www.anwalt24.de/urteile/bgh/2026-07-01/viii-zr-125_23))

Remember the statute’s mechanics: if the previous tenant’s rent exceeded the general cap, the new rent may match that previous rent, but only to the extent that rent was itself lawful; late‑year increases and agreed reductions are excluded when computing Vormiete. Keep documentary proof of the exact amount due at the end of the prior tenancy. ([gesetze-im-internet.de](https://www.gesetze-im-internet.de/bgb/__556e.html?utm_source=openai))

The BGH’s approach protects the system’s logic: the rent brake prevents jumps, but it does not force a landlord to abandon a rent that was materially justified before. For landlords, the challenge is evidentiary—showing why the prior rent was lawful. ([anwalt24.de](https://www.anwalt24.de/urteile/bgh/2026-07-01/viii-zr-125_23))

Proof landlords need to rely on exceptions

To rely on Section 556f sentence 1 (newly created units), keep: building permits or change‑of‑use approvals; structural and condition reports proving the space was uninhabitable; detailed invoices, trade breakdowns and cost summaries evidencing substantial construction; photographic documentation before/after; and proof that first use and first letting occurred after 1 October 2014. Courts looked at these factors in VIII ZR 50/23. ([anwalt24.de](https://www.anwalt24.de/urteile/bgh/2026-07-01/viii-zr-50_23))

To rely on Section 556f sentence 2 (first letting after “comprehensive modernisation”), keep: a cost file allocating measures to the unit; evidence that multiple core systems were upgraded (e.g., plumbing, electrics, heating, thermal envelope); and a costs‑to‑new‑build comparison showing around one‑third of comparable new‑build cost, excluding land. Commentary and case law use this benchmark; expect experts and market data to substantiate it. ([haufe.de](https://www.haufe.de/id/beitrag/zap-92020-rechtsprechungs-und-literaturuebersicht-zum-c-umfassende-modernisierung-als-ausnahmetatbestand-HI13852051.html?utm_source=openai))

To rely on Section 556e(1) (Vormiete), keep: the prior lease; rent increase notices under Section 559 BGB and evidence of the underlying works; a rent ledger showing what was actually owed at the end of the prior tenancy; and proof you gave the new tenant the mandatory pre‑contract information in text form. The statute spells out what must be disclosed and in what form. ([gesetze-im-internet.de](https://www.gesetze-im-internet.de/bgb/__556e.html?utm_source=openai))

Risk: without records you cannot meet your burden. If you fail to prove an exception, the rent reverts to the cap and you face back‑payments plus legal costs. Independent counsel should review your file before you let at an exception‑level rent. ([dejure.org](https://dejure.org/dienste/vernetzung/rechtsprechung?Aktenzeichen=VIII+ZR+211%2F23&Datum=2026-07-01&Gericht=BGH))

Compliance checklist for foreign landlords and asset managers

- Before acquisition: ask sellers for a dossier containing permits, cost files and dated photos for any post‑2014 conversions or modernisations; require warranties in the SPA that data is complete for Sections 556e–556g BGB. ([gesetze-im-internet.de](https://www.gesetze-im-internet.de/bgb/__556f.html?utm_source=openai))

- At leasing: deliver the Section 556g(1a) BGB disclosure in text form before the tenant signs. State the Vormiete amount, any modernisation in the last three years, or that it is a first letting after comprehensive modernisation, as applicable. Keep delivery proofs. ([gesetze-im-internet.de](https://www.gesetze-im-internet.de/bgb/__556g.html?utm_source=openai))

- If challenged: respond to information requests promptly. A tenant may sue to compel disclosure; courts also decide fee values based on the excess rent at stake, raising cost exposure. ([app.omnilex.ai](https://app.omnilex.ai/de/sources/court-decision/de-rii--kore300412026/bgh-2026-07-01-viii-zr-21123?utm_source=openai))

- Never assume that a simple refurbishment creates a new‑unit exemption. Test against the BGH’s substantial‑effort standard and the one‑third cost indicator with independent cost data. ([anwalt24.de](https://www.anwalt24.de/urteile/bgh/2026-07-01/viii-zr-50_23))