If a retaining wall or landscaping project was to cost $5,000, the product materials will cost about $1,666 or about 33% of the total job or quote. In addition, the breakdown of the labour for this $5,000 project would cost about the same as the product materials which is another $1,666 or about 33% of the total job. The balance of these costs of about 33% are made up of sand and rubble, dump fees, earthworks and other miscellaneous costs.