Can you take your landlord to court for over charging you for repairs?

Yes -but. . . You must have documentation to prove that: A) The poor health symptoms are caused by the problems in the unit B) That you have repeatedly informed the landlord about the problem and requested that it be repaired C) That the landlord did not do so within "a reasonable time". All three can be difficult, but the tricky one is C, as "a reasonable time" varies by what the problem is and by local and state regulations. For an active leak/flood, it varies from 6 to 24 hours, and goes up sharpely from there. On top of all of that, it depends on the type of repairs that need to be made. Not all repairs are the responsibility of the landlord. So check your local laws and by-laws as well as your contract to make sure the landlord is actually responsible for the necessary repairs.

For the UK the rules are similar to those described above, but in the UK the owner or landlord of a property is considered an Occupier and as such has a duty to not only those living in the property, but also those visiting the property. If the defect causes an obvious danger such as defective wiring - te chances of a successful claim against the landlord are good if an injury occurred. if for example the problem is water ingress causing mold and hence breathing disorders such as Asthma - there is still a good chance of success, but it will depend on how long the problem has existed and what notice the landlord had of the problems.

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Yes and you must provide proof that will prove your complains.