In order to be an effective pressure washing service, it is important to apply the right amount of pressure and the proper method on the different surfaces being cleaned. This will help to avoid any kind of damages. The process of removing moss, algae and accumulated dirt can actually make your surface look better.
HD Landscape & Maintenance provides pressure washing service in Lake Oswego, Oregon. We are a professional, licensed (Oregon LCB #9977) and insured company. Our pressure washing service includes removal of moss, algae and accumulated dirt from driveways, patios, decks and siding using high-pressure water when needed.
By Donavan Hesedahl, Founder & Owner · Last updated 08 September 2026
Just like the licensed company Lake Oswego homeowners use for lawn and landscaping services, we provide that same level of accountability for our exterior cleaning services including power washing Lake Oswego properties as well. We usually perform work on:
The most common requests we receive are for driveway and patio pressure washing services in Lake Oswego OR that Lake Oswego homeowners request once per year along with house washing for Lake Oswego properties during winter. Sometimes people refer to it as power washing in Lake Oswego – it means the same thing either way.
The majority of single service projects – one driveway, one patio, or one side of a house – tend to fall into the low and mid-range hundreds, while full property services will cost more depending on square footage and buildup. We do not give a flat quote without seeing the property; the answer is that simple and straightforward.
There are three main factors which affect the price:
Surface area. It is cheaper to clean a two-car driveway compared to cleaning a driveway, patio and full siding wash.
Buildup and material. It is harder to remove a lot of moss on porous concrete than dust on smooth pavers.
Single visit or recurring. Maintenance schedule varies from season to season and prices will be different for each project.
If you are trying to comparing the cost to pressure wash a driveway or patio near Lake Oswego Oregonthe quickest way to find out what you can expect is to simply give us a call and give us the surface and square footage.
In such a climate, the majority of driveways, patios, and north-facing siding will require one cleaning per year — two for shaded, moss-filled surfaces. The Willamette Valley receives an average of 37 inches of rainfall annually, with the greatest part falling during the months of October to May, making these surfaces remain moist for long stretches.
This is the kind of climate that moss and algae thrive in. The information provided by the OSU Extension about pest control in Oregon clearly states that algae growth is common in patios, walkways, and shaded walls in areas where there is rainfall, and advises that the method used for removal is pressure washing. Those wishing to remove moss and algae with pressure washing in rainy Lake Oswego region do so as soon as the first few dry days of spring arrive.
That’s what HD Landscape & Maintenance does. We are a licensed, insured company in Oregon under LCB License #9977 with a 4.9-star rating according to the Trustindex database. Our company is a full pressure washing service Lake Oswego OR, where you can verify us according to the real license number we have and where we will show up to quote you and then do the job properly.
Our company is the best pressure washing for mossy Pacific NW surfaces in Lake Oswego OR when searching for pressure washing service for moss-covered Pacific Northwest surfaces because we use pressure according to material and not all surfaces receive the same treatment.
We serve the whole of Lake Oswego, from Mountain Park through Palisades, Glenmorrie, Iron Mountain, Lake Grove, as well as our neighbors in West Linn and Tualatin. A few have their own special twist: many homes in Mountain Park and Glenmorrie require maintenance by HOA standards, and many sites near the shore of Oswego Lake require additional factors we take into account prior to even starting the power washing.
Iron Mountain’s steep, shaded sites often retain the moss throughout the dry months, which is why these sites will normally fall in the category requiring twice-a-year visits rather than once a year.
Two key factors differentiate thorough pressure washing from an expedient job, namely matching the right pressure to surfaces being washed and runoff water management.
As far as methodology is concerned, we utilize low pressure along with fan spray nozzles for wood, composite deck, and painted siding, while high pressure is used for concrete and pavers only – the same criteria the residents of Oregon should be aware of when hiring a pressure washing company, since improper settings will result in paint removal or soft surfaces damage.
With regard to water runoff, the stormwater program of the City of Lake Oswego specifically mentions that water runoff from pressure washing should not go into storm drains and should be directed into landscaped areas instead, since storm drains discharge water directly into nearby water bodies without any filtration whatsoever.
Another recurring job that comes up often is driveway and patio cleaning before putting the house on the market; here the driveway and patio need cleaning because during winter algae growth has left the concrete dark and slippery in shady spots. This usually only takes one day to accomplish, and there’s no need for any sealing or replacement work under the surface.
Frequently Asked Questions
What does pressure washing cost in Lake Oswego?
Single surface projects such as driveway or patio are generally within the low to mid-hundreds range. Whole property washes will cost more depending on the square footage and moss. We will provide you with a written quote prior to beginning any project.
How often should surfaces be washed in a wet climate?
For driveways, patios, and siding annually, but twice a year if you have a lot covered with trees or one in which moss grows quickly. The extended wet period in Lake Oswego between October and May determines the second cleaning in shaded and northern areas.
Do you remove moss and algae buildup?
Yes. Moss and algae elimination is one of the most frequent tasks we undertake, from concrete to pavers, decks, and sidings on Lake Oswego properties that are both lake-facing and shaded.
Do you wash driveways, patios, and siding?
Yes – driveways, patios, walkways, decks, fencing, and siding for both residences and businesses, whether on an occasional or regular basis.
Is it safe for pavers and delicate surfaces?
Absolutely, provided that the pressure and technique are properly coordinated with the material in question. Lower pressures and other types of nozzles are used for softer materials, such as wood decks, painted siding, and the joints between pavers.
If moss, algae, or winter dirt has overtaken your driveway, patio, deck or siding, call HD Landscape & Maintenance to have the team and the tools that can solve your problems and not harm anything underneath it. You can reach out to us via 971) 336-5520 or visit the season and specialty services or check out the portfolio .