Siding Installation in Hillsboro, OR
Need a siding contractor in Hillsboro? Gorilla Works installs James Hardie fiber cement siding and trim over a full moisture barrier, on everything from the older homes near downtown and Orenco to the builder stock in Tanasbourne, Quatama and the new rows going up in South Hillsboro. We strip the old siding, show you the wall behind it, and rebuild it to stand up to Tualatin Valley winters.
- James Hardie fiber cement siding and trim
- Licensed in Oregon (CCB #198186), registered in Washington (L&I EXTERDC884PP)
- Limited 5-year workmanship warranty, in writing
Do You Need a Permit to Replace Siding in Hillsboro?
A like-for-like re-side that leaves the structure alone is light on paperwork. Two things can change that in Hillsboro. If the crew opens the wall and the sheathing or framing has to be rebuilt, that is structural work and it runs through the city's Development and Permit Center on the Hillsboro Permitting Portal, which we handle. And if your home is on the city's Cultural Resource Inventory, exterior remodeling is reviewed by the Historic Landmarks Advisory Committee under Community Development Code 12.27.300, where the standard leans toward repairing original features rather than replacing them. We check your address against both before we quote.
A Newer Town, With a Siding Clock of Its Own
Hillsboro is younger than its neighbors. The Census Bureau's 2020-2024 survey puts the median year built at 1997, a full decade newer than Beaverton, with 43,576 housing units. The 1990s and 2000s alone account for 47.4% of them, and only 24.4% of the city was built before 1980.
That changes the siding story. A huge share of Hillsboro homes went up during the tech-driven building boom and are now 20 to 35 years old, which is right when first-generation builder siding and its caulking start to give up at the seams. When it does, the question is always the same: what did the water do to the wall behind it. The only way to answer that is to take the old siding off and look.
Then there is the new end of town. South Hillsboro, a roughly 1,400-acre plan with about 8,000 homes projected across Reed's Crossing, Rosedale Parks and Butternut Creek, is some of the newest housing in the metro. On those homes the siding is whatever the builder put up, and the real question is how carefully it was flashed the first time.
More Freezing Nights Than Beaverton or the River
NOAA's 1991-2020 normals at Portland-Hillsboro Airport record 35.93 inches of rain a year and about 64 nights at or below freezing, roughly 22 more freezing nights than Beaverton sees. That freeze-and-thaw cycle is hard on siding: water works into a seam or a failed bead of caulk, freezes, expands, and opens the gap a little wider every cold snap. Underneath, the valley's silt soils, the Aloha and Quatama series the USDA first described right here in Washington County, hold a perched water table only one to two feet down through the wet months, so walls near grade stay damp for weeks.
That is why the order of operations matters more than the paint color. On every job we set a water-resistive barrier over the sheathing, flash each window, door and roof line to drain downhill, and fasten the Hardie boards to the clearances and spacing the manufacturer requires. James Hardie fiber cement is built to resist rot, warping, cracking and swelling through exactly this kind of wet, freezing winter.
What Happens, Start to Finish
- Measure and a written price. We walk every wall, check your plan area and the historic inventory, and give you a written price that spells out the James Hardie product and trim.
- Strip it and haul it off. The old siding comes down to the sheathing and is hauled away, listed on your written estimate, so nothing is guessed at and nothing is left in your driveway.
- Read the wall. Any soft sheathing or framing is shown to you in the open, and we take care of the city permit that repair needs.
- Barrier and flashing. A full moisture barrier and flashing at every opening and roof line, lapped to send water back out.
- Board and trim. Hardie siding and trim to the maker's pattern, caulked and finished clean.
- Walkthrough, backed by our limited 5-year workmanship warranty.
Doing windows at the same time saves a round of flashing and trim. See window replacement in Hillsboro, the product details on our James Hardie siding page, or what it runs on the siding cost guide.
Why Choose Gorilla Works for Siding in Hillsboro
Licensed in Oregon, Registered in Washington
Oregon CCB #198186 and Washington L&I EXTERDC884PP. Every install crew is led by an installer with 5+ years of experience.
Commercial-grade flashing
The company clads commercial buildings across the Northwest through Exteriors Design, the company behind Gorilla Works, and your home gets the same water-management detail those jobs demand.
A written price, line by line
Your price names the exact James Hardie product, the trim and the flashing, so you can set it next to any other bid and compare it straight down.
Financing
Financing for qualified homeowners, including zero-down, so a whole-house re-side does not have to wait or get split into pieces. All financing is subject to credit approval. Rates, terms and payments may vary based on credit.
New here? Start with siding installation, the James Hardie product page, or our Beaverton siding page next door.
The Same Company Clads Apartment Buildings
Gorilla Works is a trade name of Exteriors Design Contractors, Inc., and one of that company’s biggest siding jobs sits right here in Hillsboro: Reeds Crossing, where Exteriors Design installed metal siding, James Hardie siding, sheet metal and windows. Residential siding under the Gorilla Works name is newer, with only a few homes so far, so the commercial record is the one to check:
- Reeds Crossing, Hillsboro, OR (2024): metal siding and James Hardie siding, sheet metal and windows.
- Strong Family Apartments, Portland, OR (2026): full weather barrier, windows and siding.
You can drive past Reeds Crossing and look at the cladding yourself. Your house gets the same flashing and weather-barrier standard that building needed.
Siding Across Hillsboro and Washington County
We serve every part of the city: Orenco and Orenco Station, AmberGlen, Tanasbourne, Quatama, Witch Hazel, downtown and the older streets around it, and out through the new South Hillsboro neighborhoods of Reed's Crossing, Rosedale Parks and Butternut Creek. Every Hillsboro ZIP, 97123 and 97124.
City or county? Some homes with a Hillsboro address are not inside the city. Reedville and Aloha are unincorporated Washington County, so their permits run through Washington County Building Services at 155 N First Ave in downtown Hillsboro rather than the city. We confirm which one covers your address before we quote. We also build fences here: fence installation in Hillsboro.
Frequently Asked Questions
Have questions about materials, pricing, or installation? Here are the answers homeowners ask us most.
Sources
Checked November 2026. Hillsboro revises its plans and maps, so your address gets re-checked against the current versions before the job.
- US Census Bureau ACS 2020-2024, tables B25034/B25035, Hillsboro city (via Census Reporter)
- City of Hillsboro, Development and Permit Center
- Hillsboro Community Development Code 12.27 (Historic Resources) and 12.80 (review procedures)
- City of Hillsboro, South Hillsboro project
- NOAA 1991-2020 normals, Portland-Hillsboro Airport
- USDA NRCS, Aloha and Quatama soil series
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