How Often Should You Pressure Wash Your House in London?

If you’ve ever looked at the side of your house after a long Canadian winter and wondered what exactly happened to it, you’re not alone. That grey, streaky film coating your siding, the green creep making its way across your driveway, the dull look of a deck that once gleamed—it’s all part of life in London, Ontario. Our climate is beautiful, but it is not kind to exterior surfaces. Between the wet springs, humid summers, freezing winters, and everything in between, grime builds up faster than most homeowners realize.

So the question isn’t whether you should pressure wash your house—it’s how often. And the honest answer? It depends on more factors than a single sentence can cover. In this article, we’re going to break it down clearly and practically, so you can make a smart decision for your specific property.

Why Pressure Washing in London, Ontario, Is More Important Than You Think

London sits in a region that receives above-average precipitation year-round. That moisture, combined with our humid summers and heavy leaf-fall seasons, creates the perfect environment for mold, mildew, algae, and biological growth to take hold on virtually every outdoor surface of your home.

But it’s not just about looks. Unchecked mold and algae growth on your siding can deteriorate the paint or finish, trap moisture against the surface, and — over time — compromise the structural integrity of the material underneath. Driveways and walkways caked in organic matter become slippery and hazardous. Decks that aren’t cleaned regularly begin to rot from the inside out, long before the damage is ever visible.

Regular pressure washing in London isn’t a luxury service. It’s a legitimate part of home maintenance that protects your investment and keeps your property looking its best year after year.

The General Rule: Pressure Wash Your House at Least Once a Year

For most London homeowners, once a year is the minimum recommendation for a full exterior pressure wash. The ideal time is late spring — usually May or early June — after the last frost has passed and before the summer heat really sets in. At that point, you’re dealing with a full season’s worth of winter salt residue, spring mud, and early mold growth that needs to be cleared before it bakes into surfaces under the summer sun.

However, once a year is not always enough. Depending on your property’s exposure, landscaping, and surface types, you may find that certain areas of your home need attention twice a year or even more frequently.

How Often Should You Pressure Wash Each Area of Your Home?

Different surfaces around your property accumulate grime at different rates. Here’s a practical breakdown based on what we see regularly while working on homes across London. Ontario:

House Siding (vinyl, brick, stucco) Recommended frequency: Once a year, in spring. Siding picks up a full winter’s worth of mold, mildew, road pollution, and biological staining that needs to be cleared before it sets in deeper. North-facing walls that see less sun tend to accumulate growth faster and may need more attention.

Concrete Driveway Recommended frequency: 1 to 2 times per year. Driveways take the brunt of everything—road salts, oil drips, tire marks, and weed growth creeping through cracks. A spring clean is essential after every winter. If you notice significant staining or moss growth in the fall, a second pass before freeze-up is well worth it.

Wood or Composite Deck Recommended frequency: Once a year, before sealing or staining. Decks are constantly exposed to moisture, UV, and organic debris. Annual cleaning removes algae, tannin stains from leaves, and surface grime before they degrade the wood fibers. Always pressure wash before applying any sealant or stain to ensure proper adhesion.

Walkways and Pathways Recommended frequency: Once a year, or as needed. Foot traffic areas accumulate moss, algae, and leaf staining that make surfaces slippery and unsightly. An annual clean keeps them safe and looking sharp.

Fence (wood or vinyl) Recommended frequency: Every one to two years. Wood fences absorb moisture and develop mold and discoloration over time. Vinyl fences, while more resistant, still pick up green algae along the bottom and weathered grime on the surface. A good cleaning every couple of years keeps them looking fresh and extends their lifespan.

Roof and Gutters (soft wash) Recommended frequency: Every two to three years. Black streaks on your shingles are caused by a type of algae called Gloeocapsa magma. Left unchecked, it degrades the limestone filler in asphalt shingles and shortens roof life significantly. Always use soft washing — not high-pressure — on roof surfaces.

Garage Floor Recommended frequency: Once a year, in spring. A full winter of tracked-in road salt, oil drips, and moisture leaves your garage floor stained and potentially corroded. An annual pressure wash clears all of that away and makes it much easier to spot any cracks or damage that needs attention.

Signs Your Home Needs Pressure Washing Right Now

You don’t always have to wait for your scheduled cleaning. There are clear visual signals that tell you it’s time to call in a pressure washing team sooner rather than later:

• Green or black streaks running down your siding or under your eaves—a sure sign of algae or mold that is actively spreading
• Your driveway has turned from a clean grey or charcoal tone to a patchy, blotchy brown or green
• Walkways feel slippery underfoot, even when dry—invisible algae coating the surface
• Your deck looks dull and grey rather than the rich natural tone it once had
• You’ve had construction, renovation, or landscaping work done recently that left behind dust and debris
• You’re planning to paint or stain your home’s exterior—surfaces must be pressure-washed first for proper adhesion
• A major storm recently passed through and left grime, debris, or standing water residue on surfaces

How London’s Seasons Affect Your Pressure Washing Schedule

London, Ontario’s four distinct seasons each contribute to exterior dirt and damage in their own way. Understanding this seasonal buildup helps you plan your pressure washing schedule more effectively.

Spring: The Most Important Cleaning Season

This is the prime time to pressure wash your house in London. After months of snow, freezing temperatures, and de-icing salts, your driveway, siding, and walkways are carrying the full weight of winter. Salt residue alone can cause serious long-term damage to concrete and masonry if left to penetrate and sit over the warmer months. A thorough spring pressure wash resets your property for the year and gives you a clear picture of any damage that may need repair.

Summer: Spot Treatments and Post-Construction Cleans

In summer, pressure washing needs are typically lighter — but not zero. If you’ve had landscaping done, a backyard renovation, or notice algae spreading quickly on a north-facing wall that stays shaded, a targeted clean in summer is completely reasonable. High humidity in July and August also accelerates mold growth on porous surfaces like wood decks and brick.

Fall: Pre-Winter Prep

Many London homeowners overlook fall as a pressure washing season, but it’s genuinely useful — especially for driveways and patios. Clearing away leaf debris, tannin stains, and early moss growth before freeze-up prevents those organic materials from breaking down and staining surfaces over the winter. It also means you’re heading into spring with less work ahead.

Winter: Not Recommended

Pressure washing in freezing temperatures isn’t advisable. Water can freeze on surfaces and create ice hazards, and cleaning effectiveness drops significantly in cold weather. Leave the hose for warmer months.

What Happens If You Skip Pressure Washing for Too Long?

This is something we see regularly — homeowners who haven’t had their property pressure-washed in three, four, or even five years. The results aren’t just cosmetic. Here’s the real cost of neglecting regular pressure washing in London:

Mold and mildew penetrate deeper over time. What starts as a surface-level stain on vinyl siding can work its way behind panels and into the insulation layer. By the time it’s visibly bad, the remediation cost is far higher than a simple annual wash would have been.

Concrete becomes permanently stained. Oil drips on a driveway that sits for years, and becomes almost impossible to remove without professional-grade chemical treatments. Early intervention is always cheaper.

Paint peeling accelerates dramatically. Dirt and moisture trapped beneath exterior paint act like sandpaper from the inside. A house that gets cleaned and painted will hold that paint significantly longer than one that skips the washing step.

Your curb appeal—and property value—quietly drops. Real estate professionals will tell you that first impressions matter enormously. A grimy, stained exterior signals neglect to buyers, appraisers, and your neighbors. Consistent maintenance keeps your home’s perceived value where it should be.

DIY Pressure Washing vs. Hiring a Professional in London

There’s a temptation to rent a pressure washer from a hardware store and handle it yourself on a Saturday afternoon. It seems straightforward enough on the surface. But there are some important differences worth knowing before you decide.

Consumer-grade rental machines rarely generate enough consistent pressure to properly clean concrete, and they typically lack the detergent injection systems that break down mold and organic growth at a molecular level rather than just moving it around the surface. More than a few homeowners have also damaged their siding, stripped window caulking, or accidentally forced water into wall cavities by using the wrong technique or too much pressure on the wrong surface.

Professional pressure washing in London means trained technicians who understand what pressure settings different surfaces require, which cleaning agents work on mold versus oil versus organic staining, and how to protect your landscaping and windows throughout the process. The results are noticeably better, last longer, and come without the risk of accidental damage.

Our Honest Recommendation for London Homeowners

Here’s the practical, no-fluff version: Pressure wash your entire home exterior once a year in the spring. Pay special attention to your driveway, which may benefit from a second clean in the fall. If you have a wood deck, clean it annually and follow up with sealing or staining every two to three years to properly maintain the wood.

If your home is surrounded by mature trees, sits in a shaded area that stays damp, or if you’ve noticed faster-than-normal buildup in recent years, bump your schedule up to twice a year. The investment in regular pressure washing in London is always less expensive than the repairs you’ll face if surfaces are left unchecked for too long.

At INNOVATION Property Services, we work with London homeowners every season to keep properties clean, protected, and looking their best. Whether it’s a full exterior wash, a driveway deep clean, deck restoration, or a targeted mold removal—we bring the right equipment, the right technique, and a genuine commitment to results that last.

Ready to schedule your pressure wash? Contact us today for a free, no-obligation quote, and let’s get your property looking its best.

Frequently Asked Questions