Sealcoating in the 97225 ZIP code covers the unincorporated Cedar Hills and Cedar Mill stretch of Washington County. Most lots out here are commercial pads serving apartment complexes, dental and medical offices off Barnes Road, and small retail buildings along SW Cedar Hills Boulevard. The pavement age skews older than newer Bethany subdivisions to the north, which means seal timing matters more here than it does in fresh-build neighborhoods.
Why Cedar Hills and Cedar Mill Lots Need Sealcoating
Most asphalt in 97225 was placed between 1985 and 2010. Once raveling shows up at the surface, the binder is already past peak. A timely seal cuts oxidation, blocks water from working through hairline cracks, and pushes a full overlay out another 5 to 8 years. For an apartment complex with a 200-stall lot, that overlay deferral is the line between an operating-expense seal job and a capital-improvement repave.
The geography matters too. Cedar Hills sits at the toe of the Tualatin Mountains, and runoff from above means many older lots have drainage seams along the curb. Sealcoat does not fix grade problems, but it protects the asphalt around them so you are not chasing crack failure on top of a drainage failure. We always walk the lot edges with a flashlight before quoting, because the difference between a routine seal and a seal-plus-crack-fill changes the number meaningfully.
What a Cedar Hills Sealcoat Visit Looks Like
A proper visit follows the same sequence whether you are at a 12-stall office lot off Cornell Road or a 250-stall apartment lot up by Sunset Highway:
- Power-blow and broom the whole surface.
- Treat oil spots with a primer so the seal will bond.
- Rout and fill cracks wider than a quarter inch with hot-pour rubberized sealant.
- Apply the first sealcoat coat by squeegee on edges and spray on the field.
- Allow tack-off, then apply the second coat.
- Reset stripes, ADA stalls, fire lanes, and directional arrows.
For a typical Cedar Hills office lot in the 8,000 to 15,000 sq ft range, the job lives on the property for 24 to 36 hours total -- one day of work, one overnight cure. We schedule night seals for retail tenants that cannot lose daytime parking, but the cure time runs longer when the morning temperature drops, so April and September night work needs careful weather windows.
Cost Discipline: What 97225 Sealcoat Actually Runs
Sealcoating is one of the few asphalt services where the per-square-foot number really does scale with lot size. Below is the published industry baseline, but the actual range you see in a Cedar Hills quote will reflect your access, crack severity, and whether striping comes with it.
Industry Baseline Range
| Scope | Cost Per Sq Ft | Typical Total |
|---|---|---|
| Small office lot (under 5,000 sq ft) | $0.15 to $0.30 | $750 to $1,500+ |
| Mid-size commercial lot (5,000 to 20,000 sq ft) | $0.12 to $0.25 | $1,000 to $5,000+ |
| Large apartment or retail lot (20,000+ sq ft) | $0.10 to $0.22 | $4,000 to $25,000+ |
| Re-striping add-on (per ADA + standard stall package) | — | $400 to $2,000+ |
Current Market Reality
Sealcoat material cost has tracked oil prices upward since 2023, and labor rates in Washington County run higher than rural Oregon zips because crew wages compete with Intel and Nike construction subcontractors. Apartment complexes that paid $0.10 per square foot in 2019 are quoting closer to $0.18 today. The other compounding factor is crack mileage. A lot that has been on a 3-year seal cycle since install will price near baseline; a lot that has gone 8 years without a seal will price closer to the top of the range because crack fill, primer, and a heavier coat all get added to scope.
Best Time to Sealcoat in 97225
The 97225 sealcoat window runs from late May through mid-October. Sealcoat needs surface temperature above 55 degrees F and no rain in the 24 hours after application. In Washington County that means:
- May -- viable but rain-risk weeks happen. Book conditional dates.
- June through August -- prime window. Lots schedule themselves around tenant calendars.
- September -- good window if the fall pattern holds dry.
- October -- last call. Night seals stop being safe by mid-month.
Outside the window, Oregon humidity keeps the surface from curing properly. A seal applied below temp glazes over but does not bond, and the first heavy rain will lift it off the pavement.
Cedar Hills Drainage and Substrate Notes
Two substrate patterns show up across 97225. The first is the older clay-soil lots near the original Cedar Hills Crossing footprint. These have moderate frost heave susceptibility and benefit from earlier crack-fill scheduling. The second is the newer fill-on-cut lots up the hill toward Cornell. These typically have better subgrade but worse runoff because the slope concentrates water at the downhill curb. Sealcoat will not solve a drainage problem, but pairing seal with a curb-and-channel inspection catches the failures that lead to alligator cracking.
The freeze-thaw cycle is moderate here -- Cedar Hills sees fewer than 30 below-freezing nights in a normal year -- but it is enough that crack-fill done before October prevents the spring widening that turns a $50 crack into a $500 pothole.
Coordinating With Larger Asphalt Work
If your lot is heading toward overlay in the next 2 to 3 years, you can still get one more seal cycle out of it, but the math changes. Sealing a lot that needs structural repair is throwing money at the surface. Before scheduling a seal on a marginal lot, get a walk with an eye toward whether Washington County sealcoating cycle pricing makes sense or whether you should be budgeting overlay. If you have a sister property in central Beaverton, our commercial sealcoating in Beaverton page covers the same scope on a different schedule and is a useful comparison.
For new build-outs or major repaints, you will also want to coordinate sealcoat with parking lot striping in Hillsboro crews so the layout transition is clean. Most Cedar Hills HOAs and property managers prefer one mobilization. We bundle when we can.
How to Get a Real Number
Sealcoat quotes that show up by email without a site walk are almost always too low. A real number requires foot-on-pavement assessment of crack severity, oil staining, edge ravel, drainage seams, and substrate condition. We do not charge for site walks in the 97225 ZIP -- it is inside our standard Washington County route.
Cojo runs sealcoat crews across the Portland metro corridor from May through October every year. We are CCB-licensed, insured, and we hold seal jobs to the same prep standard whether the lot is 4,000 square feet or 250,000 square feet. Most 97225 jobs schedule 7 to 14 days out in peak season.
Schedule a free site visit and we will give you a real range for your lot, plus the timing window that fits your tenant calendar. We also offer asphalt maintenance programs that bundle seal, stripe, and crack fill on a 3-year cycle so you do not have to chase the schedule yourself.