About us
Better bids start with visible math.
ProWash Estimator builds free estimating tools that help pressure washing contractors turn production rates, chemical cost, and real business costs into a defensible job price.
Who builds this
Built by Casey Marsh
ProWash Estimator is built and maintained by Casey Marsh, a tools developer focused on turning estimating math into calculators that contractors can actually edit and trust. Casey is not a pressure washing contractor. The production rates, chemical cost ranges, and formulas on this site are compiled from published industry pricing guides, equipment manufacturer documentation, and direct feedback from pressure washing operators who use the calculators and report back what their real numbers look like.
That distinction matters: every default value on this site is labeled as a starting benchmark, not a guarantee, and every calculator is built so an operator with real jobsite experience can override the defaults with their own numbers in seconds. The goal is not to claim field expertise ProWash Estimator doesn't have. It's to make the math transparent enough that someone who does have that expertise can quickly check it and correct it.
Why we built ProWash Estimator
Many pressure washing quotes start from a flat per-square-foot number copied from a competitor or an old job. That can hide real differences in surface material, staining severity, water access, story height, and chemical cost. Our calculators make those assumptions visible so operators can adjust them using their own equipment and experience.
Where we are starting
The first four calculators cover driveway and concrete, roof soft wash, deck and fence, and commercial bids, because these are the most common pressure washing job types with genuinely different pricing logic. Future calculators are only added once there is a dedicated methodology for that job type, not as a placeholder.
Our principles
Calculations run locally in your browser, inputs are not stored by us, and the method behind each result is explained in plain language. We provide practical planning estimates without pretending that one formula can replace an on-site walkthrough or professional judgment.
How the site is funded
ProWash Estimator may display advertising in the future. Advertising helps keep the tools free, but advertisers do not influence our calculations or educational content. Sponsored content, if ever published, will be clearly identified.
Who this site is for
Built for pressure washing operators who need clear estimating math
ProWash Estimator is designed for owners, solo operators, and crew leads who need a practical way to check labor and chemical cost assumptions before sending a quote. The site focuses on the variables that often get skipped in a quick per-square-foot guess: production rate, staining severity, chemical cost, story height, and job minimums.
We start with driveway, roof, deck, and commercial jobs because these are the most requested residential and commercial pressure washing services. The same approach can later support additional job types, but each one gets its own method instead of a reused generic page.
Review approach
How new tools and guides are added
Every tool on ProWash Estimator is expected to expose the assumptions behind the result. A page should not only show a number; it should explain the inputs, the formula, the limits, and the field conditions that can change the answer. This is why the site includes calculators, a worked example, methodology notes, and a scope checklist.
When a calculator is added, we look for three questions: what job decision does it support, what assumptions can an operator edit, and what should the operator verify before using the result in a proposal? Pages that cannot answer those questions do not belong in the estimating library.
The site does not claim to replace a professional estimator or a safety-certified soft wash technician. Its value is in making the estimating conversation more concrete: how many hours, what production rate, what chemical and equipment cost, what overhead recovery, and what scope notes should be reviewed before a price leaves the operator's desk.