Paver Cleaning & Restoration in Mercer Island
Paver Cleaning in Mercer Island, WA
Buyers notice a walkway that moves, and Mercer Island owners think about resale more than most. Much of the island's hardscape went in with the houses in the 1960s through 1980s and has sat under mature firs and madronas ever since, with moisture off Lake Washington keeping the joints damp. That is decades for moss and grass to work on jointing sand.
On older surfaces the honest read matters most. Joints that still hold sand get the chlorine wash and nothing more. Joints full of growth have already lost sand, and the right move is the deep clean with a full re-sand.
Two limits, stated up front. We do not reset or relevel pavers that have already shifted, and we do not seal. We handle the deep cleaning a sealer needs to bond, then refer the sealing to a specialist.
Areas we serve in Mercer Island
- First Hill
- Mercerdale
- Mercerwood
- East Seattle
- North End
- South End
Mercer Island questions
- We are getting the house ready to list. Which option comes first?
- Send photos and we will tell you straight. Growth in the joints means the deep clean and re-sand, clean joints mean the wash is enough. If you plan to seal before listing, we do the prep and refer the sealing itself.
- There is a white crusty haze on the pavers. Can you remove it?
- That is efflorescence, handled as a complex stain add-on with an acid-based treatment. We test a spot first and give you honest odds, and any stain returns if its cause stays.
Before and after
The difference, on real jobs.
Moss had taken the joints of this landing below the steps. Cleared, treated, and clean. 
The walkway run on the same visit. Green joints and debris out, the field back to even color.
Why it matters
The problem this solves.
Moss and grass root into the joints, displace the jointing sand, and the pavers shift and rock underfoot. Spores establish before you can see them, so a surface that looks clean is growing tomorrow's problem.
How we do it
Our approach.
Two options, both performed in house, and we tell you honestly which one your surface needs. Neither resets, relevels, or replaces pavers that have already shifted. We prep for sealing but refer sealing itself to a specialist.
- Honest read on which option you need
- Chlorine treatment kills growth before sand loss
- Joints pressure washed only with full re-sand
Two services, one honest read
Which one do your pavers need?
Both are our own crews, and we tell you straight which one your surface needs. The joints decide. If the sand is still in them, the wash keeps it there. If grass and moss have taken over, the sand is already gone and washing alone will not fix it.
Paver Maintenance Wash
The preventative option. A chlorine treatment once or twice a year kills the organics in the joints, then a light rinse. No blasting, so the sand stays packed where the installer left it and the surface stays clean year round.
It runs even when the pavers look clean, because spores establish before you can see them. Annual for most surfaces, twice a year for shaded or fast-growth areas, scheduled automatically so you never think about it.
See maintenance plans
Deep Clean & Re-Sand
The corrective option. When grass and moss fill the cracks like this, the sand is already displaced. We pressure wash the joints clear of the entrenched growth, treat the surface with chlorine, and re-sand the whole field with our own crew.
Then we recommend the maintenance plan, so you never pay for this project twice.
Why the schedule
What the joints do without it.
Paver problems are not cosmetic, they are structural. The jointing sand is what holds the field level, and the growth is what takes the sand.
| Left alone | On the schedule | |
|---|---|---|
| Moss and grass | Root into the joints | Killed before they take hold |
| Jointing sand | Pushed out by roots, carried off by rain | Stays packed where the installer left it |
| The surface | Pavers shift, settle, and rock underfoot | Level and safe underfoot |
| The fix | Joint wash-out, full re-sand, base sand at risk | A quick wash, once or twice a year |
Maintenance costs a fraction of repair.
A re-sand is a real project: joints washed out, surface treated, new sand worked in. The wash that prevents it is a quick visit once or twice a year, at a fraction of a re-sand's cost.
See maintenance plansAdd-ons
Add it while we're there.
The crew and equipment are already on site, so these attach to your visit.
Complex Stain Removal
Acid-based treatment for rust, efflorescence, battery acid, and tannin. Test spot first, honest odds, and stains return if the cause stays.
See the full service
Pressure Washing and Soft Washing
The crew is already set up, so the driveway, walkway, or patio alongside joins the same visit. Cold water, hot water for oil and gum, and the method matched to each surface.
See the full service
Why WindowWorks
Who shows up matters.
Anyone can rent a pressure washer. After 20+ years on Eastside exteriors, and a 4.9 rating across 300+ reviews, we can tell you the real difference is the person holding the wand: what they know, how they were trained, and whether the company behind them takes care of them. We take care of our techs, so they take care of your property.
Background-checked
Every technician is background-checked before they ever step onto a customer's property.
Certified, skill by skill
Our crews earn certification across 369 individual skills in 10 categories, each one signed off by an evaluator, never just by clocking time.
Paid like professionals
A living wage, healthcare, and dental. People who are treated well do careful work, and they stay, so you see the same faces.
Licensed, bonded, and insured
With OSHA-aligned safety training for the at-height work. If someone is on your roof, they are trained and covered for exactly that.
Method matched to the surface
Soft wash where pressure would damage, hot water where cold cannot lift, the right chemistry for the stain. The method follows the surface, not the other way around.
Documented before and after
Every job is photographed before and after, so you can see exactly what changed and keep it on file.
Common questions
Good to know.
My pavers look clean. Why get on a schedule?
Spores establish before you can see them, and visible growth is already displacing sand. A quick wash once or twice a year kills it first, at a fraction of a re-sand project's cost.
What's the difference between the wash and the re-sand?
The wash is prevention: it kills joint growth while leaving your sand in place. The re-sand is correction for depleted joints; not sure which you need, send photos and we'll tell you straight.
Will pressure washing blast out my joint sand?
Careless pressure does exactly that, which is why the wash uses a low-pressure rinse. When joints need pressure washing, we pair it with a full re-sand, never spray-and-go.
Do you seal pavers?
No. We prepare the surface, including the deep cleaning a sealer needs to bond, and refer sealing itself to a specialist.
Can you fix pavers that already rock?
No, resetting and releveling isn't our work. We restore depleted joints with the re-sand, then keep the surface on a schedule so it never reaches the shifting stage again.
Can you do the driveway and patio too?
Yes, and it's the efficient way. The crew and equipment are already set up, so adjacent driveways, walkways, and patios can join the same visit.
Serving Mercer Island and the whole Eastside
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