Softwood Pine timber decking installation will cost from £100.00 to £110.00 per square metre, with balustrade to match costing £90.00 per linear metre.Although Cedar is softwood and in some cases softer than pine should not get confused with a budget installation.he cost for a cost effective/standard hardwood deck (not ipe) will be from £190 to £220 sq m this will be a simple design, cheaper hardwood material, pre-drilled and countersunk holes.