The plumber will provide a quotation based on his calculation of the cost of materials required and how many days labour the job will take. An average daily rate for a plumber on a domestic job is approximately £160.There are a multitude of tasks that a plumber would undertake and these vary in price accordingly.Installing a boiler could cost around £400 - £500 labour costs with the cost of the boiler itself ranging between £500 to £1300 for a standard boiler for a three bed semi-depending on type, make, model and quality.here are a multitude of tasks that a plumber would undertake and these vary in price accordingly. Installing a boiler could cost around £400 - £500 labour costs with the cost of the boiler itself ranging between £500 to £1300 for a standard boiler for a three bed semi-depending on type, make, model and quality.