Definitely rent a tower, add the price on to the job. It costs me £90 per week inclusive of vat delivered for a mi-tower which I think is perfect for roofs.
With regards to pricing I use a price per metre to get an idea then work out how many days it should take, how much I want to make per day then add costs on top (chemicals, tower hire, labour etc)
With regards to pricing I use a price per metre to get an idea then work out how many days it should take, how much I want to make per day then add costs on top (chemicals, tower hire, labour etc)