New home building materials' price index rose 2.7 pct in April, compared with the same month last year, after an increase of 3.5 pct recorded in April 2010, Hellenic Statistical Authority said on Friday. The statistics service, in a report, attributed the 2.7 pct to a 21.5 pct jump in the prices of diesel oil, a 13.1 pct rise in steel pipes and a 10 pct rise in iron. The index was down 0.1 pct in April from March, after an increase of 0.9 pct recorded in the corresponding period last year.