Decommissioning (facilities)

Decommissioning (Systems) - Decommissioning refers to the permanent or temporary removal from service of technical systems in buildings - particularly heating systems, elevators, fuel tanks, ventilation systems, and electrical installations. In the real estate sector, decommissioning is governed by numerous regulations, as improper decommissioning can lead to safety risks, environmental damage, and legal consequences.

Legal Obligations for Decommissioning

The decommissioning of technical systems is subject to different regulations depending on the type of system: Heating oil tanks must be professionally drained, cleaned, and either dismantled or backfilled when taken out of service (Section 46 AwSV). Heating systems may only be permanently decommissioned under certain conditions according to GEG-if replaced by a renewable heat source or if the building is no longer heated. Elevators must be reported to TÜV/DEKRA upon decommissioning (BetrSichV); the shaft openings must be permanently secured. Night storage heaters containing asbestos require professional disposal by a certified specialist company in accordance with TRGS 519 upon decommissioning.

For gas systems, the following applies: If a gas heating system is decommissioned, the gas supplier must be notified so that the building connection can be properly shut off and secured. The gas meter system is dismantled by the network operator. In the case of only temporary decommissioning-such as during a renovation-the connection may remain in place but must be decommissioned and secured.

Since the amended Building Energy Act (GEG 2024) came into effect, stricter requirements apply to the decommissioning of old boilers: Anyone who decommissions an oil or gas heating system and replaces it with a new system must ensure that the replacement meets the legal requirements for renewable energy shares. The transition periods and exceptions are complex-consulting with an energy consultant or a qualified heating specialist is strongly recommended before decommissioning.

Environmental and Safety Aspects

Decommissioning fuel storage tanks (heating oil, diesel) poses a significant environmental risk: Residual fuel can leak and contaminate the groundwater. The local water authority must be consulted when decommissioning underground tanks. For electrical systems, decommissioned lines must be de-energized and secured against re-energization.

Proper decommissioning must be documented-a lack of documentation can become a problem in the event of a future sale or insurance claims. Buyers of existing properties should therefore ask for proof of the proper decommissioning of existing old systems. If these documents are missing, significant costs for subsequent disposal and soil testing may arise.

When a property is transferred as part of a sale, documentation regarding decommissioned systems is part of the seller’s duty to provide information. Anyone who knowingly conceals that a heating oil tank remains in the ground or that an old system was decommissioned without proper disposal risks claims for damages from the buyer-even after the sale has been notarized. In case of doubt, the legal status of an old system should be clarified before the sale through a soil survey or a system inspection.

Practical Tip for Property Owners in Nuremberg

We recommend that property owners in the Nuremberg metropolitan area who wish to decommission technical systems (e.g., when replacing a heating system, converting an attic, or demolishing a building) have this work carried out exclusively by specialized contractors and document all measures taken. Proper disposal is mandatory, especially for heating oil tanks in Nuremberg basements (commonly found in single-family homes from the 1960s-1980s in Langwasser, Eibach, or Reichelsdorf).

The cost of tank removal, including disposal, is approximately 1,500-3,000 euros for an underground tank; additional costs may apply for a soil analysis if contamination is suspected. As a regional utility provider, N-ERGIE can advise on the switch to district heating or gas and coordinate the decommissioning of the old system. Anyone switching to a heat pump or district heating as part of a heating system replacement in accordance with the GEG should plan for the decommissioning of the old system as part of the project.

Frequently Asked Questions

Do I have to report a decommissioned heating system?

For oil-fired heating systems, you must report the decommissioning of the oil tank to the local water authority if the tank is buried or has a capacity of more than 1,000 liters. The decommissioning of the heating system itself must be reported to the chimney sweep, as the fireplace will be removed from the chimney sweep register. For gas-fired heating systems, the gas supplier must be informed. There is generally no obligation to report to the building authority, unless the decommissioning is part of a construction project requiring a permit. The authorized district chimney sweep is an important point of contact in any case.

How much does it cost to decommission a heating oil tank?

The costs depend on the type and location of the tank: An above-ground steel tank (1,000-5,000 liters) costs approx. 800-1,500 euros for emptying, cleaning, and disposal. An in-ground tank costs 2,000-4,000 euros (excavation, cleaning, disposal, backfilling the pit). In addition, there may be costs for a soil analysis if contamination is suspected. Some oil suppliers offer buyback programs for remaining heating oil, which offset part of the costs. Obtain at least two quotes from specialized disposal companies.

Can I simply leave a decommissioned system in the building?

For the heating system (boiler, burner), this is generally possible-it remains in the boiler room as an inactive system. For heating oil tanks, it is recommended to completely dismantle them or have them professionally backfilled, as residual amounts and outgassing pose a risk. For elevators, the shaft openings must be secured. Equipment containing asbestos (e.g., night storage heaters) may remain in the building only as long as it is intact and undamaged-in the event of damage or renovation, asbestos remediation in accordance with TRGS 519 is mandatory.

What should be considered when selling a property with decommissioned systems?

Upon sale, all known decommissioned systems must be disclosed in the purchase agreement and in the handover documentation. Buyers should specifically inquire about heating oil tanks, old piping networks, and disconnected shafts and request to see the corresponding disposal certificates. If no proof is available, an expert or building inspector should be consulted before the purchase agreement is notarized. The costs for subsequent disposal can be significant and should be factored into the purchase price.

Back to the Real Estate Glossary.