Swiss federal law and Swiss cantonal law are relevant in the field of environmental protection. The detailed zoning laws play an important role in this area. The construction of new buildings is subject to detailed environmental regulations. In order to control the possible detrimental effects of large new developments on the environment, an Environmental Examination, i.e. a detailed assessment of the project’s likely future environmental impact (Umweltverträglichkeitsprüfung), is required before a construction permit can be issued.
As a general rule, the environmental law in Switzerland is based on the “polluter pays” principle (Verursacherprinzip): the person who has spilled, released or discharged a substance will normally be liable for any ill-effects it causes and has to pay for the damage. However, future owners and occupiers may also become liable for contamination already present at the real estate when they acquire it.
Real estate may be contaminated as a result of current and former uses. Based on the federal law on contamination (Altlasten), the authorities can require a remediation of such contamination at any time, and not only on the occasion of an application for a construction permit. The costs for such measures are usually to be borne by the actual owner. Accordingly, a relevant search with regard to such contamination needs to be made prior to the purchase of a real estate, since a potential contamination of the building or the soil may considerably influence the price of an object and may lead to substantial additional costs.
Newly built as well as existing buildings must fulfil certain conditions in order to obtain a construction permit. With regard to air pollution, the specific emission limits set by law must not be exceeded. In case an inspection shows that the emission standards are no longer met, the owner will be set a deadline for the modification or the replacement of the system.
Acquisition due diligence may involve the appointment of environmental consultants to consider documentary information and to carry out a site visit or, if necessary, to undertake further intrusive investigations. Due to the serious possible effects of environmental issues, it is important to identify potential problems early so that there can be negotiation on price, in particular considering the need for and scope of any remediation and / or the need to put in place protection in respect of any existing contamination related losses that may arise in the future.
If a real property is registered in the brownfield cadastre, the property transfer is subject to the prior consent of the competent authorities.
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