Cornelius, Oregon General Contractor

Highway 8 runs from our Beaverton office door straight into downtown Cornelius. We have been driving it for seventeen years — and we know whose desk your permit actually lands on.

Who is the best general contractor in Cornelius?

Green O Construction — CCB #204939, veteran-owned, unlimited endorsement — serves Cornelius from our Washington County headquarters twenty minutes east. We specialize in exactly what Cornelius housing needs most: renovating and re-cladding older homes, and we already know the city's unusual permit routing through Forest Grove.

A farm town growing into its next chapter

Cornelius is a city of 12,694 (2020 Census) in a single ZIP — 97113 — strung along Highway 8 where it splits into the Adair and Baseline couplet through downtown. The Tualatin Valley around it was hop yards and grain fields a century ago, and the town still works like a farm town: practical houses, real lots, and a housing stock that skews older than its neighbors'. That is the renovation opportunity — early and mid-1900s homes downtown, 60s-80s stock behind them, and newer subdivisions only at the edges.

Older stock means older assemblies: roofs on their third cycle, hardboard siding past its service life, undersized electrical panels, and foundations poured before modern drainage code. Add the valley-floor geography — Council Creek to the north, the Tualatin River floodplain to the south — and water management becomes part of nearly every scope we write here. The wet season from November through April is when those problems announce themselves; the smart money fixes them in the dry months.

What we build in Cornelius

Interior Renovation

Cornelius's older homes are the best renovation value in Washington County — solid bones, real lots, pre-inflation square footage. We open up mid-century floor plans, rebuild kitchens and baths, and sequence the trades so the house stays livable. Our architect drafts in-house, which keeps a wall-removal project from stalling for weeks on outside engineering.

Roofing

Third-cycle roofs are common in Cornelius, and a third cycle done right starts with stripping to the deck — no roof-overs. We are CertainTeed SELECT ShingleMaster 4-Star certified, we photograph the deck condition before covering it, and we register the material warranty in your name, not ours.

Siding + Exterior

Failing hardboard and weathered cedar are the two claddings we replace most in Cornelius. Hardie plank handles the valley's wet-dry cycle better than either, and on the older downtown homes we match original trim profiles so the house keeps its character instead of looking flipped.

Additions + ADUs

Cornelius lots are generous by metro standards, which makes single-story bump-outs and detached ADUs pencil more often than they do closer in. Feasibility is free: we check setbacks, floodplain mapping on the south side, and utility capacity before you spend a dollar on drawings.

Storm Restoration

Western Washington County catches wind off the Coast Range gaps, and the January 2024 ice storm hit older roofs and gutters hard out here. We tarp fast, document with drone imagery, and write scopes in adjuster language — and we will tell you plainly when a repair beats an insurance claim.

Where we work in Cornelius

Cornelius is compact — one crew can cover it corner to corner in five minutes. These are the pockets where our estimates cluster.

Cornelius permits: three agencies, one contractor who knows the map

Here is what surprises most Cornelius homeowners: the city does not run its own building department. Structural, plumbing, and mechanical permits are reviewed, issued, and inspected by the City of Forest Grove Building Division (1924 Council St, Forest Grove) under contract. Electrical permits go through Washington County Building Services in Hillsboro. Land-use questions start with Cornelius Community Development at 1300 S Kodiak Circle, and right-of-way work — driveways, sidewalks — is permitted by Cornelius Public Works.

Three agencies on one remodel is exactly the kind of coordination that stalls projects when nobody owns it. We own it: every permit filed in Green O's name, every inspection scheduled by us, every correction answered by our office — you never call a permit counter.

The job we see most in Cornelius

The typical Cornelius call looks like this: a 1960s ranch off N Adair with a roof at year twenty-two, hardboard siding checking at the south wall, and a kitchen last touched in the 90s. The right play is phased — roof and siding as one exterior package this season (one Forest Grove-issued permit, one scaffold mobilization), kitchen over the winter when exterior work slows and the schedule favors you. If that sounds like your house, the first walkthrough and the written scope are free.

Every service we run in Cornelius

Cornelius services, by category

Also serving nearby

Free walkthrough in Cornelius

Twenty minutes out TV Highway. Same-day callback for storm emergencies, 24-hour callback for everything else — or email info@greenoconstruction.com.

Hours: Mon-Fri 7am-6pm, Sat 8am-2pm · Closed Sundays · CCB #204939