Illustrative example
A landlord starts a major refurbishment of the unit next door and, for weeks, sends workers through the tenant's kitchen to reach shared pipework, often without warning.
The covenant of quiet possession is imposed by the act of letting itself, so it does not depend on any wording in the lease. What the outcome turns on is the scale and duration of the interference with the tenant's use and possession, rather than the noise as such, since noise from a neighbour who is not claiming the property is a nuisance question under section 3479 instead.
The landlord gives 24 hours of written notice for each entry, confines access to fixed hours on named days, and credits an agreed weekly rent reduction for the remaining weeks of the work.