Cap. 604 Art. 14Permissible increases. 

(1) Rent increases may only take place once every year.

In the absence of any express agreement, the rent cannot be revised during the term of the lease:

Provided that during the first year the rent shall be fixed at the same amount.

(2) Yearly increases may not exceed the annual variations recorded in the Property Price Index published by the National Statistics Office. The annual variation shall be understood as the average of the previous four quarters recorded until the date of the increase.

(3) The increase foreseen in sub-article (2) may never exceed the previous rent by more than five per cent (5%).

(4) If the average annual variation is negative, this shall not result in the reduction of the rent.