putkiremontti (noun) –
In Finland, putkiremontti is always going on somewhere. Of about 2 million housing units, putkiremontti is going on in about 10,000 per year. And every housing unit needs putkiremontti about every 45-50 years. All water and sewer lines are repaired or replaced, and it can be very expensive. Sometimes as much as 500 euros per square meter!
(Information courtesy of wikipedia and news articles.)