A landlord's obligation to keep a rented home fit to live in - one the lease usually cannot sign away.
In nearly every state, a residential tenancy carries an implied promise that the property is fit for people to live in and will be kept that way. "Implied" means it is read into the tenancy by law whether or not the lease mentions it, and in most states the tenant cannot validly waive it even by signing a lease that says otherwise. It is one of the few terms in ordinary consumer contracting that works that way.
What it covers is the essentials rather than the desirable: heat, running and hot water, working plumbing and sanitation, structural soundness, electrical safety, and freedom from serious pest infestation. It is not a general standard of good repair, and it does not usually reach cosmetic complaints. The line between the two is drawn by state law, and often by a local housing code that supplies the specifics.
The remedies matter as much as the obligation, and they are where tenants most often go wrong. Depending on the state, a tenant may be able to withhold rent, pay for the repair and deduct the cost, sue for the reduced value of the tenancy, or in serious cases treat the tenancy as ended. But almost every state conditions these on strict prerequisites - written notice to the landlord, a reasonable opportunity to repair, and sometimes paying rent into court rather than keeping it. A tenant who simply stops paying rent without following the state's procedure usually converts a strong habitability position into an ordinary non-payment eviction, which is the most common way a good claim is lost.
The commonest reason to get advice is procedural rather than substantive: the tenant is usually right that the condition is unacceptable and wrong about what they are allowed to do next. A lawyer or a tenant advice service will know whether the state permits withholding at all, what notice has to be given first, and whether rent must be escrowed - and getting that sequence right is what keeps the claim alive if the landlord responds by filing to evict. Photographs, dated written complaints and any housing inspector report are the evidence that decides these cases.
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