Balcony power plant in a rented apartment: Can the landlord still prohibit the mini PV system

1. The New Legal Situation: The Balcony Power Plant as a "Privileged Measure" (§ 554 BGB)

       [ BGB § 554 Old: Landlord's discretion ]
                         │
                         ▼ (Legal reform)
       ┌──────────────────────────────────────────┐
       │  BGB § 554 New: Structural alteration    │
       │  for electricity generation by plug-in   │
       │  solar systems                           │
       └──────────────────┬───────────────────────┘
                         │
                         ▼
       ┌──────────────────────────────────────────┐
       │  Tenant's fundamental legal right        │
       └──────────────────┬───────────────────────┘
                         │
                         ▼
       [ Refusal only in case of unreasonable hardship ]

What exactly does the privilege mean?

• Legal right: As a tenant, you have a fundamental legal right to have the landlord or the WEG agree to the installation of a mini PV system.
  
  
• No more baseless "no": A blanket "I don't want that in my property" is legally ineffective. The landlord can no longer refuse permission at their sole discretion.
  
  

2. When can the landlord still refuse a balcony power plant?

┌─────────────────────────────────────────────────────────────────┐
│               When is a prohibition lawful?                     │
└────────────────────────────────┬────────────────────────────────┘
                                 │
         ┌───────────────────────┴───────────────────────┐
         ▼                                               ▼
┌───────────────────────────────┐               ┌───────────────────────────────┐
│     Unreasonable Hardship     │               │     Concrete Danger           │
├───────────────────────────────┤               ├───────────────────────────────┤
│ • Severe damage to substance  │               │ • Lack of structural integrity/│
│ • Serious monument protection │               │   safety                      │
│ • Unreasonable visual impact  │               │ • Fire hazard due to tinkering│
│                               │               │ • Professional installation   │
│                               │               │   not possible                │
└───────────────────────────────┘               └───────────────────────────────┘

Overview of possible objective grounds for refusal:

1. Monument protection and ensemble protection:
   If the property is under strict monument protection and the responsible monument protection authority prohibits attachments to the outer facade, the landlord may refuse installation on the outside. Note: Installation on the balcony floor is usually exempt from this.
   
   
2. Serious danger to the substance of the building:
   If the installation requires deep drilling into a sensitive external thermal insulation composite system (ETICS) facade or into the structural substance of a historic balcony railing, the landlord may make specifications for fastening or reject unsuitable methods.
   
   
3. Lack of structural integrity or wind load safety:
   If the tenant cannot prove that the system is securely anchored even in storms and bad weather, this represents a legitimate safety risk.
   
   
4. Massive visual impairment:

                     [ 1. Preparation & Product Selection ]
                                      │
                                      ▼
                     [ 2. Written Information Request ]
                                      │
                                      ▼
                     [ 3. Review by Landlord / WEG ]
                                      │
                                      ▼
                     [ 4. Professional Installation & Registrations ]
   

   Step 1: Product selection & preparing documents

   Choose a certified complete set from a reputable manufacturer. Keep product data sheets, inverter certificates, and information on the planned mounting system ready.
   
   

   Step 2: Written application to the landlord

   Send the landlord a polite but firm letter requesting consent, referring to § 554 BGB. Include the technical data sheets.
   
   

   Step 3: Registration in the Market Master Data Register (MaStR)

   Since the latest simplifications by the Federal Network Agency, registering a balcony power plant is extremely straightforward: you only need to register the device in the free Market Master Data Register. The separate, bureaucratic registration with the grid operator has been dropped.
   
   

   5. Template / Sample Letter: Application for Consent to Install a Plug-in Solar Device

   Copy this text, adapt the bracketed data, and send the letter preferably by registered mail or by e-mail with a read receipt to your landlord or property management.
   
   
   Plaintext

   [Your first and last name]
   [Your street and house number]
   [Your postcode and city]
   [Your phone number / email address]
   
   [Name of landlord / property management]
   [Street and house number]
   [Postcode and city]
   
   [City, Current date]
   
   
   Subject: Application for consent to install a plug-in solar device (balcony power plant) according to § 554 BGB
   Tenancy: [Street, house number, floor/apartment number]
   
   
   Dear Ms./Mr. [Name of landlord / case worker],
   
   I am writing to you today because I would like to install a compact plug-in solar device (balcony power plant) on the balcony of my rented apartment to contribute to climate protection and sustainably reduce my energy costs.
   
   According to § 554 BGB in the version of the law on electricity generation by plug-in solar devices, tenants have a legal right to approval of structural alterations for the use of plug-in solar devices.
   
   To ensure a transparent and understandable process for you, I am providing you with the details of the planned installation:
   
   1. Technical details:
      - The system consists of [number, e.g., 2] certified solar modules and an inverter with a maximum output power of [e.g., 800 watts].
      - The components comply with all applicable electrotechnical norms and VDE standards.
   
   2. Fastening & structural protection:
      - The mounting will be carried out using a tested bracket specifically designed for balcony railings.
      - NO drilling will be done on the facade, insulation, or railing. The building structure will remain completely undamaged.
      - The power will be routed into the apartment via a non-destructive flat ribbon cable window feed-through.
   
   3. Safety & dismantling:
      - Coverage by my private liability insurance, which covers any damage to the leased property, is in place.
      - I naturally undertake to completely and tracelessly dismantle the system upon moving out.
   
   Attached you will find the technical data sheets and sketches of the planned mounting system for your information.
   
   I kindly ask you to confirm your consent for this measure in writing by [Insert date in 3 weeks]. Should you have specific, justified design requests regarding the external appearance, I am happy to discuss them.
   
   Thank you for your support and understanding.
   
   Sincerely,
   
   [Your handwritten signature]
   [Your printed name]
   
   
   Attachments:
   - Product data sheet of the plug-in solar device
   - Specification of the mounting system
   

   6. Checklist: Your Path to a Legally Compliant Balcony Power Plant

   • [ ] Check your lease agreement: Are there specific clauses regarding facade use? (These do not override Section 554 of the German Civil Code, but they do provide clues).
     
     
   • [ ] Select mounting system: Prefer clampable systems that do not require drilling.
     
     
   • [ ] Contact liability insurance: Obtain confirmation that photovoltaic rental damages are covered.
     
     
   • [ ] Submit written application: Send a sample letter to the landlord/management.
     
     
   • [ ] Professional installation: Securely attach after receiving approval.
     
     
   • [ ] Complete MaStR registration: Register for free with the Federal Network Agency.
     
     

   7. Frequently Asked Questions (FAQ on Tenancy Law & Balcony Power Plants)

   Q1: What can I do if the landlord simply does not respond to my application after 4 weeks?

   Answer: Silence in tenancy law does not automatically constitute consent. Give the landlord a reasonable deadline in writing (e.g., 14 days). If they still do not respond or reject the application without demonstrating a valid hardship, they are acting unlawfully. You then have the right to sue for consent in court. Under no circumstances should you install the system independently without a response, as this can lead to warnings.
   
   

   Q2: Do I have to hire an electrician for the installation?

   Answer: No, for standard balcony power plants with Schuko plugs, there is generally no legal requirement for the tenant to hire an electrician. The devices are designed as "plug-and-play" systems. The landlord can only demand a professional electrical installation if there are well-founded doubts about the safety of the existing house installation (e.g., in the case of outdated aluminum wiring without an RCD).
   
   

   Q3: Can the Homeowners' Association (WEG) prohibit attachment to the external railing?

   Answer: No. Due to the amendment of the Condominium Act (Section 20 WEG), the privileged status also applies to homeowners' associations. The WEG can no longer fundamentally block installation on the external railing (which belongs to the common property). It can only help shape it, for example, by specifying uniform housing colors or mounting types for the entire building.
   
   

   Q4: Is it sufficient to simply place the solar storage unit or panels on the balcony floor?

   Answer: Yes. If you place the modules on the floor of your balcony with a stand, without firmly screwing them to the building or the railing, it is usually not even a structural alteration in legal terms. This falls under the contractual use of the rented property (comparable to balcony furniture or plant pots). In this case, landlord approval is generally not required, provided that wind load securing is ensured.
   
   

   Q5: Who is liable if a module falls from the balcony due to a storm and causes damage?

   Answer: The operator of the system, i.e., the tenant, is generally liable for damage to third parties (e.g., parked cars or passers-by). For this reason, landlords rightly demand proof of private liability insurance. Inform your insurance company about the balcony power plant – most modern tariffs include plug-in solar devices in the basic coverage free of charge.