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No. Environmental responsibility is imperative and of public order. Although private contract says otherwise, administration can proceed against seller for historical contamination or against current owner. Liability distribution pacts are only valid between parties, not against administration.

Any activity collected in Annex I of Royal Decree 9/2005. This includes from heavy industries to small mechanical workshops, printing presses, fuel deposits and some dry cleaning activities. If plot was industrial at some point, it is advisable to check it.

Depends on complexity of necessary remediation. Preliminary report can be ready in 4-6 weeks, but administrative decontamination process can last between 6 months and 2 years according to technique employed and extent of contamination.

It is possible through negotiation of price that reflects estimated decontamination cost and formalization of liability assumption pact by buyer. However, price will suffer significant discount (30-50%). In many cases it is advisable to lead decontamination to obtain real market price.