I tend to charge around 7.5 - 8 cents/sq.ft for large commercial concrete jobs like 10,000 sq.ft and higher. I charge more if it is really nasty. How about this job below. I posted this yesterday on the concrete cleaner thread.
I just got back from an estimate in Denton, NC. 10,000 square foot old steel fabrication warehouse. They want all the concrete floors, walls, ceiling, and the lights clean-->(first time anyone has requested that to me).
The concrete is really black and nasty. The walls and ceiling don't look bad. I like using Brown Derby Truck wash from Soap Warehouse for oily black stuff like this and maybe add extra Sodium Hydroxide to it for strength on the floor. Maybe Potassium Hydroxide too? I don't have a hot water machine so I will need to use more chemicals than if I did.
Anyone have a better suggestion?
The walls are about 20 feet high and the flat work is 100 feet squared.
Price - 10,000 sq.ft flat x $.10= $1000
10,000 sq.ft ceiling + 8000 sq.ft walls = 18,000 x $.05= $900
Chemicals = $150 approx.
76 miles round trip= $50 Travel charge/gas
TOTAL = $2100
How does this sound for this job?