Land and buildings are classed as ‘contaminated’ if, due to previous industrial activity, there is contamination present which could cause harm LRR tax relief is available for a wide range of decontamination measures on both land and buildings This includes the removal of contaminated soil and water, the treatment of harmful organisms, the removal of natural contaminants (for example, radon and arsenic), the removal of buried structures, and the removal and treatment of invasive plants (such as Japanese Knotweed) Relief is also available for the removal of asbestos from buildings, post-tensioned concrete, building and machinery foundations, below-ground redundant services, and reinforced concrete basements