A trading update from the firm today revealed UK sales last year were down 1.5% as total group revenue remained flat at £2,635m.
SIG’s core markets are insulation and energy management, interior fit out and roofing.
The firm has now increased its cost saving target to £10m with the bulk of the cuts due to fall this year.
SIG said: “In its Interim results in August the Group announced it was targeting a further £7m of cost savings.
“SIG has subsequently identified £3m of additional efficiencies from its branch network, thereby increasing the target to £10m, around three-quarters of which will fall in 2013.
“SIG expects construction markets in 2013 to remain challenging and likely to decline at a rate similar to 2012.
“Against this background, and building on recent performance, SIG expects to make further progress in 2013 by continuing to focus on sales outperformance, gross margin enhancement and improved operational efficiency.”