Non payment of construction final bill

Since, the cost of construction is higher than the Average Cost due to Global crisis such as steel, cement, sand, stone aggregates, plywood materials, and M Sand have had a major price increase in the last year, pushing up the overall construction cost. To ensure that client needs and expectations are fulfilled with the aim of achieving client satisfaction, we have initiated the construction marginal cost, so clients are only charged the optimum price difference, to purchase the materials used for their project. There are no additional charges for our services or profit added to this. n nBut my client has only paid 50% and denied for other half to pay for it. I need to put stay on his property and then want other half from it in legal way.