The problem
Why most jobs like this go sideways.
Most additions and ADUs stall at the permit desk because the drawings did not match Oregon's structural, energy, and setback code before submittal. When the plan review comes back with 40 comments, the timeline slips by months. Green O runs feasibility, drawings, and engineering before you submit — so the permit clears on the first cycle.
- Beaverton and Portland ADU code changed in 2024 — old plans get rejected on setback and height
- Foundation not sized for local soil load = engineer supplemental required after excavation
- Energy code compliance (Oregon Zone 4) missed = window and insulation redesign after framing
- Utility tie-in (sewer, power, gas) not scoped upfront = surprise trench work at week 12
Additions and ADUs die in pre-construction - drawings stall, the engineer can't be reached, the permit gets bounced for something the architect should've caught. You wanted a guest suite for your mother-in-law. You got a six-month delay and a stalled hole. You deserve a contractor who keeps the architect, the engineer, the permit, and the crew under one roof - literally on the same payroll - so the project actually moves on a calendar you can plan around.
Included scope
In writing, before you sign anything.
Detached ADU
400-800 sq ft. Architect drawings + foundation + finish.
Home Addition
Bump-out, second story, primary suite. Engineered.
Garage Conversion
Detached + attached. Insulation, HVAC, finish.
What you get
What lands in your file when we're done.
You get a written feasibility report on your lot before drawings begin, architect and PE engineering handled in-house, a fixed weekly calendar during construction, permit pulled in Green O's name, and a 10-year structural warranty. Additions run under one CCB license from feasibility through certificate of occupancy.
- Free lot feasibility report — setbacks, height envelope, utility capacity
- Architect on payroll + three PE engineering partners for structural and energy calcs
- Permit pulled by Green O; plan review comments handled by our team, not yours
- Fixed weekly calendar with utility, framing, and finish milestones
- 10-year structural warranty on foundation and framing
- Free lot feasibility check - setbacks, height, lot coverage, easements - drawings yours to keep
- Architect-stamped drawings produced in-house (no outside firm waiting list)
- Structural PE on retainer - 3 partner firms, parallel quotes when speed matters
- Permit applications submitted by us, inspections coordinated, red-tags handled
- Excavation + foundation by our own crew (we own the excavators - no rental delays)
- Framing, MEP rough-in, finish - all under one schedule, one PM
- 17 years of Beaverton + Portland + Hillsboro + Tigard ADU permitting experience
How we work
How we run it.
Additions run through a 4-step sequence: lot feasibility, architect and engineering package, self-performed excavation and construction, then certificate of occupancy walk-through. Typical detached ADU in Beaverton runs 6 to 9 months from first meeting to CO, with permit averaging 8 to 14 weeks.
- Step 1: Lot feasibility — setback, height, utility, soil check (free)
- Step 2: Architect drawings + PE engineering + energy calcs + permit submittal
- Step 3: Self-performed excavation, foundation, framing, finish, utility tie-in
- Step 4: Final inspections, certificate of occupancy, warranty registration
Free Feasibility
Free site visit + feasibility check (lot coverage, setbacks, height, sewer connection). You see whether it pencils BEFORE you pay for drawings.
Drawings + Permit
Architect-stamped drawings (in-house). Engineering coordinated. Permit pulled in our name. Site, tree, and neighbor protection plan.
One Schedule To CO
Excavation, foundation, framing, MEP rough-in, finish - all under ONE PM, ONE schedule. You call one number for the whole 5-7 months.
CO + Warranty In Your Name
Final inspection signed. Certificate of Occupancy in your hand. 10-year structural workmanship warranty, transferable to next owner.
Questions, answered
Frequently asked.
Homeowners ask us four questions most: how long an ADU takes end-to-end, whether Beaverton allows detached ADUs on their lot, if we handle the architect and engineer, and whether the ADU can be rented. Short answers: 6 to 9 months typical, most R-5 lots qualify, yes both in-house, and yes short-term or long-term rental is allowed in most zones.
- Typical detached ADU in Beaverton: 6-9 months from first meeting to CO
- Most Beaverton R-5 and R-7 lots qualify for a detached ADU under 800 sq ft
- Architect on payroll + PE engineering partners — one contract covers both
- Detached ADUs may be rented long-term or short-term (Beaverton STR permit required)
How long does an ADU take?
Detached ADU typically 5-7 months from permit issue to CO. Permits themselves are 2-4 months in most jurisdictions. We give you a real calendar before you sign - not a hopeful guess.
Can you build an ADU on my Beaverton lot?
Beaverton allows ADUs in most R-zones. We do the lot feasibility for free as the first step - so you know whether it pencils before you commit a dollar.
Do you finance ADUs?
We don't lend, but we partner with Hearth + Service Finance Co for HELOC and construction-to-perm options.
Garage conversion - do I lose my garage?
Yes if it's a full conversion. Detached ADU keeps the garage. We help you compare both options in the free feasibility - no upsell.
What happens if I pick the wrong contractor?
Wrong contractor takes a deposit, files an incomplete permit application, the city bounces it, and you sit on a stalled lot. Or worse - they pour a foundation that doesn't meet setback and you face teardown. 17 years of Beaverton permitting means we know what the inspector will flag - before he flags it.
Can you build an ADU on my Beaverton or Portland lot?
Yes — ADUs are one of our most-requested adds. We handle the survey, design, permit, foundation, framing, MEP, and finish in-house. Architect on payroll keeps the design loop tight.
How long does an addition take, foundation to final?
Most residential additions run 4-7 months from permit to certificate of occupancy. We give you a written calendar, not a verbal guess.
Where we work
Additions & ADUs across the Portland metro
Twelve cities. One CCB-licensed crew that lives here. The contractor in your driveway with the out-of-state plate will be gone by next storm — we're still answering the phone in year seven. Tap any city for local proof, response times, and the ZIPs we cover.
Topic cluster
Read deeper on additions & adus.
Free inspection — no obligation, written report yours to keep
Probably not the right move if you want the cheapest bid.
If you want this done once — by a CCB-licensed local who'll still answer the phone in year seven — we reply to every web inquiry inside 15 minutes during business hours (Mon–Sat 8 AM–7 PM PT). Storm damage or active leak? Call (971) 226-7751 — same-day callback.
- 4.3 stars — 51 Google reviews
- CCB #204939
- Veteran-owned
- 17 years Portland metro
- 15-min business-hours reply
Direct line
(971) 226-7751
Hours
Mon–Sat
8 AM – 7 PM PT
Office
20001 SW Tualatin Valley Hwy
Suite 208
Beaverton, OR 97006
Storm Response
24-hour callback
365 days/year