# Pressure washing Change Order Guide: Pricing & Billing Mid-Job Extras (2026)

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- **Last Verified:** Mon Oct 19
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- **Summary:** How to write a pressure washing change order when scope changes mid-job: pricing hidden conditions, getting written customer sign-off & free template.

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# Pressure washing Change Order Guide: Pricing & Billing Mid-Job Extras (2026)

**Short answer:** A **pressure washing change order** is a numbered, written amendment to your original pressure washing estimate that documents any mid-job scope addition, hidden site condition, or spec upgrade—such as **Chemicals and pre-treatment** or **Soft wash — siding, roof** during **a driveway**—priced at your full **$95/hr** (**$0.22–$0.55 per sq ft washed**) rate plus **22%** material markup **before** you perform the extra work.

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## What triggers a pressure washing change order during a driveway or house siding?

Protecting your net take-home margin when pricing and billing **pressure washing** depends on how a **pressure washing contractor** handles the exact moment a job expands after work is already underway. Even when your original quote for **a driveway**, **house siding**, or **a deck** is measured carefully per **sq ft washed**, three field events trigger a **pressure washing change order**:

1. **Client-Requested Scope Additions ("While You Have the Tools Out"):** The customer watches **a driveway** come together and asks you to add *Chemicals and pre-treatment* or *Soft wash — siding, roof*.
2. **Concealed Conditions & Code Upgrades (PWNA surface PSI limits, sodium hypochlorite plant-protection dilution & stormwater reclaim rules):** Once you open up the work area on **house siding**, you uncover hidden substrate/system defects or code violations requiring **Sodium hypochlorite (SH), surfactants, rust removers, degreasers & O-rings (Line 22)** and a **$0** permit adjustment.
3. **Unbilled Pressure washing Gotchas:** Solo pressure washing contractors routinely lose margin to **forgetting to bill the $60 trip/setup charge, unrecorded Minimum service charge, and Sodium hypochlorite (SH), surfactants, rust removers, degreasers & O-rings (Line 22)** when mid-job extras are done on a verbal nod.

See how baseline pressure washing scopes are structured in [pressure washing estimate template](/keel/pressure-washing-estimate-template/), [pressure washing invoice template](/keel/pressure-washing-invoice-template/), and [pressure washing pricing guide](/keel/pressure-washing-pricing-guide/).

## Why does doing extra pressure washing work on a verbal handshake hurt solo pressure washing contractors?

When a homeowner on **a deck** asks for *Chemicals and pre-treatment* ($441.75) and says *"Just add it to the bill,"* proceeding without a written **pressure washing change order** creates two immediate problems:

- **The Price-Perception Gap in Pressure washing:** A homeowner assumes a mid-job addition while you are already on site costs a few dollars, whereas your real cost includes **$95/hr** labor, **Sodium hypochlorite (SH), surfactants, rust removers, degreasers & O-rings (Line 22)** marked up **22%**, and extra **Skid-mounted truck/trailer mileage and small-engine gasoline (Line 9)**.
- **Statutory Written-Change-Order Rules:** Under state home-improvement statutes (such as [Federal Trade Commission (FTC) Business Guidance & Cooling-Off Rules](https://www.ftc.gov/business-guidance)), extra residential pressure washing work performed without a signed or written price amendment is difficult to enforce if the client balks at the final invoice.

## What five fields belong on every pressure washing change order?

Every **pressure washing change order** issued by a solo **pressure washing contractor** should tie directly to your operational benchmarks for **Pressure Washing & Soft Washing**:

| Pressure washing Operational Benchmark — Change order controls | Field Standard for Solo Pressure washing contractors |
| :--- | :--- |
| **Primary Pricing Unit & Rate** | $0.22–$0.55 per sq ft washed ($95/hr + $60 trip fee) |
| **Upfront Deposit Benchmark** | 30% deposit on multi-day/material jobs (30% upfront deposit on multi-day or material-staged pressure washing jobs (100% on completion for single-visit service calls)) |
| **Wholesale Material Markup** | 22% markup on Sodium hypochlorite (SH), surfactants, rust removers, degreasers & O-rings (Line 22) (~$75 sample materials) |
| **Common Scope Additions** | Chemicals and pre-treatment, Stain pre-treat — oil, rust, mould, and expedited pressure washing scheduling |
| **Code & Permit Standard** | PWNA surface PSI limits, sodium hypochlorite plant-protection dilution & stormwater reclaim rules (typical permit allowance: $0) |
| **Key Deductible Expenses** | Sodium hypochlorite (SH), surfactants, rust removers, degreasers & O-rings (Line 22); 4–8 GPM belt-drive pressure washers, 12V soft-wash pumps, surface cleaners & hoses (Line 18) |
| **Vehicle & Route Deduction** | Skid-mounted truck/trailer mileage and small-engine gasoline (Line 9) |
| **Frequent Billing Gotcha** | forgetting to bill the $60 trip/setup charge, unrecorded Minimum service charge, and Sodium hypochlorite (SH), surfactants, rust removers, degreasers & O-rings (Line 22) |

Before touching the extra sq ft washed scope on **a driveway**, verify that your change order records:
1. **Change Order ID & Base Estimate Link:** e.g., *"Change Order #CO-1 to Pressure washing Estimate #1042 (A driveway)."*
2. **Itemized Sq ft washed Scope Added or Removed:** Explicitly naming *Soft wash — siding, roof* and *Chemicals and pre-treatment* plus compliance with **PWNA surface PSI limits, sodium hypochlorite plant-protection dilution & stormwater reclaim rules**.
3. **Exact Price Delta (Labor at $95/hr + Materials at +22%):** State the fixed dollar addition or exact unit rate (**$0.22–$0.55 per sq ft washed**).
4. **Schedule Impact & Payment Terms:** Note whether the change adds days to **house siding** and whether a **30%** material draw is due immediately.
5. **Timestamped Client Signature or Text/Email Approval:** Captured before installation.

## How should a pressure washing contractor price a mid-job change order using sq ft washed rates?

Never underprice a **pressure washing change order** below your standard **$95/hr** rate. Mid-job changes on **house siding** often cost *more* per **sq ft washed** than planned work because they require an unscheduled supply-house run (**Skid-mounted truck/trailer mileage and small-engine gasoline (Line 9)**) and setup reset:

| Pressure washing Scope Line (mid-job change order) | Quantity & Unit (sq ft washed) | Unit Rate (USD) | Extended Line Total |
| :--- | :--- | :--- | :--- |
| Flat surface — driveway, patio (mid-job change order) | 276 sq ft | $158.60 | $43773.60 |
| Soft wash — siding, roof | 3 sq ft | $92.59 | $277.77 |
| Chemicals and pre-treatment | 3 flat | $142.10 | $426.30 |
| Stain pre-treat — oil, rust, mould | 6 sq ft | $76.09 | $456.54 |
| Water supply / tank | 6 flat | $125.59 | $753.54 |
| Height or access surcharge | 8 flat | $59.59 | $476.72 |
| Setup and travel | 8 flat | $109.09 | $872.72 |
| Minimum service charge | 11 flat | $158.60 | $1744.60 |
| **Pressure washing Ticket Subtotal (mid-job change order)** | **Billed per sq ft washed** | **$95/hr benchmark** | **$48781.79** |

If a client adds *Soft wash — siding, roof* and *Chemicals and pre-treatment*, include the full **22%** material markup on **Sodium hypochlorite (SH), surfactants, rust removers, degreasers & O-rings (Line 22)** and account for **forgetting to bill the $60 trip/setup charge, unrecorded Minimum service charge, and Sodium hypochlorite (SH), surfactants, rust removers, degreasers & O-rings (Line 22)** so the extra work strengthens your job margin.

## What if a pressure washing customer refuses to sign a change order for concealed damage?

When opening up **a driveway** or **a deck** reveals a hidden defect that prevents you from meeting **PWNA surface PSI limits, sodium hypochlorite plant-protection dilution & stormwater reclaim rules** or honoring your **1-year pressure washing workmanship warranty**:

1. **Pause Work on That Section and Photograph the Condition:** Show the client clear photos of the issue alongside the requirement in **PWNA surface PSI limits, sodium hypochlorite plant-protection dilution & stormwater reclaim rules**.
2. **Give Two Written Choices:** Option A: Approve **pressure washing change order #CO-1** so you can repair the condition properly using **Sodium hypochlorite (SH), surfactants, rust removers, degreasers & O-rings (Line 22)**. Option B: If code permits, sign a written warranty disclaimer acknowledging the pre-existing defect.
3. **Never Install Unsafe or Non-Compliant Pressure washing Work:** If safety or code forbids proceeding and the owner refuses the change order, suspend work cleanly and invoice for the completed phase as detailed in [what to include on an invoice](/keel/what-to-include-on-an-invoice/).

## What is the fastest way to send pressure washing PDFs for change orders on iPhone?

[Keel](https://apps.apple.com/us/app/keel-invoice-maker-receipts/id6786659713) is built specifically for one-person pressure washing businesses managing **pressure washing change order** on site: build itemized sq ft washed quotes at $95/hr, convert them to numbered PDF invoices in one tap, capture hardware receipts for 4–8 GPM belt-drive pressure washers, 12V soft-wash pumps, surface cleaners & hoses (Line 18), and track deductible mileage privately on your phone with no bank connection. Free to download on the App Store.

## How do your pressure washing change orders records tie into Schedule C and code compliance?

Every numbered pressure washing invoice and supplier receipt you issue for pressure washing change orders feeds directly into your year-end gross receipts and Schedule C deductions (Sodium hypochlorite (SH), surfactants, rust removers, degreasers & O-rings (Line 22)) under [Federal Trade Commission (FTC) Business Guidance & Cooling-Off Rules](https://www.ftc.gov/business-guidance). Keeping PWNA surface PSI limits, sodium hypochlorite plant-protection dilution & stormwater reclaim rules notes and your 22% material markup separated on your job ledger ensures you never overpay self-employment tax.

## Frequently asked questions

**When should a pressure washing contractor use a change order instead of a new estimate?**

Use a revised estimate before the customer signs and pays the 30% deposit for a driveway. Once pressure washing work has started on site, document any scope addition (Chemicals and pre-treatment), concealed repair, or material upgrade as a numbered Change Order so your original contract remains binding.

**Can a pressure washing contractor get change order approval by text message on site?**

Yes—sending the client a text or email stating the exact added pressure washing scope (Soft wash — siding, roof), the added dollar total at $95/hr plus 22% material markup, and getting a written "Approved" reply creates a timestamped audit trail that you mirror on your PDF invoice. Keeping your sequential pressure-washing client invoices, dated supply-house receipts, and signed scope approvals organized by job address ensures you can verify every figure during a customer walkthrough or tax review.

**How do I price an extra supply-house run on a pressure washing change order?**

Include your standard $60 trip/procurement fee or bill the procurement time at $95/hr alongside the 22% markup on Sodium hypochlorite (SH), surfactants, rust removers, degreasers & O-rings (Line 22), and log the supply-run miles (Skid-mounted truck/trailer mileage and small-engine gasoline (Line 9)) for your Schedule C deduction.

**How should approved pressure washing change orders appear on the final invoice?**

Keep the original base contract lines for house siding intact at the top of the invoice, then list each approved change order on its own numbered line ("Change Order #CO-1 — Chemicals and pre-treatment, approved [Date]") so the client sees the exact math from initial quote to final balance.

**What if a pressure washing contractor already completed extra work without a signed change order?**

Immediately list the extra sq ft washed work as a separate line item on your pressure washing invoice, attach before-and-after photos showing the installed Sodium hypochlorite (SH), surfactants, rust removers, degreasers & O-rings (Line 22), and reference the date and time of the customer's verbal request to preserve your quantum-meruit claim.

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*This guide provides general educational and operational information for pressure washing contractors as of 2026 and does not constitute formal legal or tax advice. Consult [Federal Trade Commission (FTC) Business Guidance & Cooling-Off Rules](https://www.ftc.gov/business-guidance) and a qualified professional for rules in your jurisdiction.*