How Long Does It Take to Pressure Wash a Dirty Deck?
Estimate how long it takes to pressure wash a deck with heavier dirt, algae, mildew, or buildup.
Quick answer
It usually takes 1 to 1.4 hours for 1 person to pressure wash 350 square feet of a deck with heavy dirt or buildup. A typical estimate is around 1.2 hours.
Calculator
Adjust the inputs below to estimate pressure washing time and cost.
Estimated range
1 to 1.4 hrs
Best estimate
1.2 hrs
Most likely time based on the current inputs
Typical pace
291.7 sq ft/hr
Estimated DIY cost
$45
Estimated rental, fuel, or basic supply cost.
Estimated professional cost
$131 to $289
Typical planning range for hiring the job out.
How to use this how long does it take to pressure wash a dirty deck?
Use this estimate to plan a pressure washing project before renting equipment, buying supplies, or comparing the cost of hiring a professional service. Surface type, dirt buildup, stains, water pressure, and equipment strength can all affect the time required.
Flat concrete surfaces like driveways and sidewalks are usually more straightforward, while decks, siding, patios, and heavily stained areas may require slower passes, pretreatment, or extra rinsing. If there is algae, mildew, oil staining, or heavy grime, allow more time.
Planning pressure washing time
Pressure washing time can vary depending on square footage, surface type, dirt buildup, stains, equipment, and water pressure. Many homeowners compare renting a pressure washer, using their own equipment, or hiring a professional pressure washing service.
How we estimated this
This estimate is based on a practical production-rate model, then adjusted for variables like team size, scope, difficulty, and task conditions where relevant.
What affects the estimate
- • Task difficulty and detail level
- • Team size and real-world efficiency
- • Square footage, size, or quantity involved
- • Prep work, obstacles, or site conditions
Frequently asked questions
How accurate are these pressure washing estimates?
These estimates are designed for planning purposes. Actual time can vary based on water pressure, equipment quality, surface condition, dirt buildup, obstacles, and experience level.
Does an electric pressure washer take longer than a gas pressure washer?
Usually yes. Electric pressure washers are often slower for large outdoor surfaces because they typically have lower flow and cleaning power than gas or professional equipment.
Does heavy dirt or buildup make pressure washing take longer?
Yes. Heavy dirt, algae, stains, or built-up grime can require slower passes, pretreatment, repeated cleaning, or extra rinsing time.
Is pressure washing a driveway faster than pressure washing siding or a deck?
Often yes. Flat concrete surfaces are usually more straightforward, while siding and decks can require more care, different angles, and slower cleaning to avoid damage.