Pressure Washing Duration: What to Expect and How to Plan

Pressure washing looks simple, but the time it takes can jump from a quick 15‑minute rinse to a full‑day project. Knowing the main factors helps you set realistic expectations and avoid surprise costs.

Typical Time Frames for Common Jobs

A concrete driveway about 20 × 40 ft usually needs 2–3 gal of water and takes 30–45 minutes with a 2,000‑psi washer. A larger two‑car garage floor (30 × 60 ft) can stretch to an hour, especially if oil stains require a detergent soak.

A wooden deck of 200 sq ft often needs careful rinsing to protect the wood. Most pros finish it in 45 minutes to an hour, but if the deck is covered in mildew or old paint, the time can double because pre‑treatment is required.

House siding, whether vinyl or brick, is the most time‑consuming. A single‑story home with 1,500 sq ft of surface typically takes 2–3 hours. Two‑story homes can push past 4 hours, especially when windows and trim need masking.

Factors That Influence How Long It Takes

Surface type. Smooth concrete clears fast, while porous surfaces like stucco absorb water and need longer rinses.

Level of dirt. Light dust is a quick blast. Grease, oil, or deep‑set moss requires a pre‑clean cycle with detergent, adding 10‑20 minutes per area.

Equipment power. A 2,500‑psi, 4‑gallon‑per‑minute (GPM) washer cuts time compared to a 1,500‑psi, 2‑GPM unit. Higher PSI moves debris faster but can damage delicate surfaces, so you may need to lower pressure and go slower.

Access and obstacles. Tight corners, landscaping, or furniture that must be moved increase setup and walk‑around time.

Experience. A professional knowing the right nozzle, spray angle, and walk‑through pattern finishes quicker than a DIYer who hesitates or backs up.

Weather also matters. Cold temperatures thicken detergents, making them harder to rinse, while wind can dry surfaces before the water is fully cleared, requiring extra passes.

To keep your project within budget, ask the service provider for a time estimate that breaks down each area. For DIY jobs, plan a buffer of 25 % extra time for unexpected stains.

Finally, consider the after‑care. Waiting 24 hours before applying sealant or paint ensures the surface is completely dry, adding a day to the overall timeline but saving you re‑work later.

Generally, the longer the job, the higher the labor cost. Most companies charge by the hour, ranging from £45 to £80 per hour depending on region and equipment. Adding a detergent treatment usually adds a flat fee of £20‑£30. Knowing the expected duration helps you compare quotes fairly.

Knowing these basics lets you schedule pressure washing without surprises. Whether you’re hiring a pro or tackling it yourself, a clear timeline helps you plan the day, protect surrounding areas, and get the best clean possible.