We finished a patio pressure washing job in Tomball, TX this week. The before and after shots above are from a brick home where the back patio had a year of mold growing into the concrete. Forty-five minutes on site, a $125 invoice, and a homeowner who got their outdoor space back.
This article walks through how we do it: the equipment we run, the chemistry we use after, and the 2-year mold-free guarantee that comes standard. If you want to skip ahead, you can get your free patio pressure washing quote anytime.
Why Tomball Patios Need More Than a Surface Rinse
Short answer: Tomball patios trap moisture year-round because Greater Houston sits at 75 percent average humidity. According to NOAA’s Houston-Galveston office, the area averages more than 50 inches of rainfall per year. That moisture feeds mold, mildew, and algae. A standard pressure wash blasts the surface clean but kills nothing underneath, so the growth comes back in 60 to 90 days.
Three things make Tomball patios especially prone to fast regrowth.
The climate. Houston-area summers run warm and wet for nine months of the year. Daytime humidity and shaded afternoon hours give mold growth everything it needs.
The concrete. Most patios in this area were poured with broom finish or exposed aggregate. Both have texture, and texture holds organic matter that feeds future growth. You can rinse the surface, but the spores embedded inside the pores stay alive.
The fix that lasts. Pressure washing alone removes what you can see. To stop the mold from coming back, you have to kill what you can’t see. That second step is where most pressure washing companies cut corners, which is why their work doesn’t hold up past one rainy season. It’s the foundation of our patio and deck cleaning approach in Tomball and across the wider Houston area.
How We Pressure Wash Back Patios in Tomball (Our 2-Step Method)
Here’s the exact process we ran on the May Tomball job. Same process on every back patio we touch.
Step 1: Pressure washing with a surface cleaner.
We use a commercial pressure washer rated for 5.5 GPM at 3,000 PSI. Flow rate matters more than peak pressure. Higher flow lifts and rinses contamination off in one clean pass. Lower-flow machines (anything under 4 GPM) leave stripe marks and require multiple passes that take twice as long. The surface cleaner attachment distributes the spray evenly across the concrete so there are no etching lines or zebra stripes from a hand wand. This step pulls off the visible dirt, the embedded grime, and the top layer of organic growth.
Step 2: Post-treatment with 3 percent sodium hypochlorite.
After the surface clean, we apply a 3 percent sodium hypochlorite solution. This is the same active chemistry roof cleaners use, diluted for concrete safety. It penetrates the porous surface and kills the mold, mildew, and algae spores that pressure alone leaves behind. The solution dwells for several minutes, then gets fully rinsed. The post-treatment is the difference between a patio that looks clean for 60 days and one that stays clean for 2 years.
For surfaces that can’t take pressure (house siding, fences, roofs), we use a separate technique called soft washing. On concrete patios, this 2-step pressure plus post-treatment is the right approach.
Total time on the May Tomball patio: 45 minutes. The chairs and pots got moved out of the way and put back before we left.
What the 2-Year No-Mold Guarantee Covers
Most pressure washing companies don’t offer guarantees because they only do step 1. We offer a 2-year mold-free guarantee because we always do both steps.
Here’s what the guarantee covers. If visible mold or mildew returns to your patio within 24 months of our cleaning, we come back and re-clean the affected area at no charge. No callout fee, no labor charge, no questions asked. The guarantee is written into your invoice when we leave the job site.
What it doesn’t cover, so there are no surprises. Damage from new construction, paint overspray, oil spills, food stains, or pet accidents are excluded. So is heavy debris buildup from storms or fallen trees. The guarantee covers organic mold and mildew growth from normal use and weather exposure.
We can back this guarantee because the sodium hypochlorite post-treatment kills the spore base. Without that step, no honest company can promise 2 years.
How Much Does Patio Pressure Washing Cost in Tomball?
Short answer: Patio pressure washing in Tomball, TX starts at $125 for a standard back patio under 250 square feet.
The Tomball job we showed above (small back patio, two chairs, planters, sliding door access) was $125 for the full 2-step service. Larger patios scale up by size:
| Patio Size | Typical Price | Time On Site |
| Small back patio (up to 250 sq ft) | $125 to $175 | 45 min to 1 hr |
| Standard patio (250 to 500 sq ft) | $175 to $275 | 1 to 2 hours |
| Large patio or wraparound (500+ sq ft) | $275 to $400 | 2 to 3 hours |
Three things to know about the pricing.
Both steps are included. Surface clean plus sodium hypochlorite post-treatment. We don’t break them out as upsells.
The 2-year guarantee is included. You don’t pay extra for the warranty. It’s standard.
Bundle savings. If your driveway or fence needs the same 2-step treatment, ask us about combining the patio with a full residential pressure washing job. One visit, lower combined price.
Book Your Tomball Patio Cleaning
The back patio in our photos went from a year of mold growth to a clean, even-toned surface in 45 minutes. Same patio, same chairs, same homeowner. Just cleaner concrete and a 2-year guarantee that the work holds up.
If your patio in Tomball is looking the way these “before” photos look, schedule your patio pressure washing with us. We’re 5-Star Rated, Licensed and Insured, Locally Owned in Cypress, and we use Eco-Friendly products safe for kids, pets, and landscaping.
Tomball Patio Pressure Washing FAQ
How long does pressure washing a patio last in Tomball, TX?
A standard surface-only pressure wash lasts 60 to 90 days before mold and mildew start growing back in Tomball’s humid climate. Our 2-step process (surface clean plus sodium hypochlorite post-treatment) extends that to a full 2 years, backed by our written guarantee.
Does pressure washing damage concrete patios?
No, when the right equipment and technique are used. We run a commercial surface cleaner that distributes the spray evenly. That prevents the etching lines and stripe marks that hand-wand-only cleaning leaves on porous concrete.
Is the sodium hypochlorite post-treatment safe for pets and plants?
Yes, when applied and rinsed properly. We dilute the solution to a concentration designed for residential concrete, pre-water surrounding plants, and fully rinse the area when finished. Pets should stay inside during the work and for about an hour after, until everything dries.
How often should patios be cleaned in Tomball?
With our 2-step process, every 2 years is enough. With surface-only cleaning, every 6 to 12 months in this humid climate. The 2-year approach costs less over time and looks better in between visits.