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Retaining Wall Estimate

Looking at retaining an area in front of house - 25m will need 2mtr retaining, engineer said will need post size 225 SED and they will be 3m deep...the other 25m will be 150 sed and 1.5m deep and range from 1m - 500mm out of ground...engineer said to use 100x50 RS boards, SS nails...we have all diggers and will back fill...just needing idea on cost for labour and material to build wall...cheers...oh the engineer has said posts must be 1m apart so will need 25 of each post size...