New constructions rose 1% in 2011 from a year earlier, but maintenance and repair works declined 1.4% on the year.
The data are adjusted for number of working days and seasonal factors.
In December alone, adjusted construction works inched down 0.6% on the month, but were up 0.5% compared with the same month of 2010.
In unadjusted data, construction works rose 2.8% on the year in 2010.