Best ADU Builders in Portland, Oregon

Shelter Solutions is the volume operator in Portland ADUs, and their record backs the claim better than most. CCB 167738 reads active, first licensed December 2005, with zero unpaid claims and zero unpaid civil penalties over the past decade. Their Google profile reads 5.0 across 41 reviews, the strongest combination of rating and volume in this market.

The Lead-Based Paint Renovation certification is the detail I would not skip past. Oregon requires it to bid work on pre-1978 structures, and in a city where the housing stock is largely pre-war, a basement or garage conversion without a certified contractor is a project that stops. Several builders on this page do not hold it. Shelter Solutions does.

One thing to have straight before you sign. The CCB number in their own footer, 167738, belongs to Stone Creek Building & Development Inc. Their own entity, Shelter Solutions LLC, held licence 192367 and voluntarily surrendered it in 2024. Stone Creek is named on their site as an affiliated custom-home company, so this reads as deliberate consolidation rather than anything hidden. Ask which entity signs your contract, and check the name on the paperwork is the one carrying the licence.

If your house has character worth keeping, Arciform is the call. They have held a CCB licence since January 1997, the longest unbroken record in this market by eight years, and it is clean: zero unpaid claims, zero unpaid civil penalties, separate residential and commercial bonds, liability insurance running to February 2027.

They also hold the Lead-Based Paint Renovation certification. On a Portland ADU that is not a nice-to-have. Most of the housing stock this firm works on predates 1978 by decades, and the certification is what lets a contractor legally disturb painted surfaces in it.

The honest caveat is cost. Historic and period-sympathetic work has the widest spread of any ADU category I quote, because you do not know what is behind the plaster until you open it. They publish no range, and I would not trust one if they did. What to ask instead is how they handle discovered conditions: who decides, who pays, and whether the contingency is written into the contract or left to a conversation later.

EcoCraft publishes a price range. I want to lead with that because in this market it is close to unique, and it tells you something about how a company operates before you have spoken to anyone. Their $150,000 to $350,000 is wide, but a wide honest range beats a narrow invented one, and it lets you work out in ten seconds whether you are in the right conversation.

The licence checks out. Active since April 2012, Residential General Contractor endorsement, Lead-Based Paint Renovation certification on file, and zero in both unpaid claims and unpaid civil penalties at CCB over ten years.

Two things to watch. The review base is 11, which is genuinely thin, so treat the 4.9 as encouraging rather than proven and ask for recent addresses. And their liability insurance shows an expiration of September 15, 2026. That is routine annual renewal in almost every case, but it is close enough to now that I would confirm it is done before anyone starts demolition.

Environs has been licensed in Oregon since October 2009 and the financial side of their record is clean: zero unpaid claims, zero unpaid civil penalties, and $1,000,000 of liability insurance on file running to November 2026.

Here is the part I am not going to bury, because Oregon publishes it and California does not. CCB’s disclosure block asks directly whether any complaints have been filed against a contractor in the past ten years, and for Environs the answer is Yes. That is a more useful signal than California’s single complaint-disclosure flag. It does not mean a complaint was upheld, and the zero unpaid-claims figure sitting next to it suggests nothing was left owing. Ask them what it was about.

The practical limit is lead paint. They do not hold the Lead-Based Paint Renovation certification, so a conversion touching a pre-1978 structure is not work they can take on directly. For a new detached build on a clear part of the lot, that does not matter at all.

NW Residential turns up on Oregon builder listicles, so it is here and checked. The licence is genuinely sound: CCB 162494, active since January 2005, Lead-Based Paint Renovation certification current to January 2027, and no unpaid claims or civil penalties on the ten-year disclosure.

What I could not find is anything else. No rating I could read on Google, Yelp or Houzz, and no website I could verify. That is not an accusation. Plenty of good remodelers run entirely on referrals and never build a review base. It does mean this entry rests on the state’s record and nothing else.

So they carry no best-for tag, because I am not in a position to say what they are best for. If someone you trust has recommended them, the licence will not be your problem. If you found them on a list, keep looking until you have something to go on beyond a clean file.

Wolf Industries is the modular route in Portland. They build to a fixed catalogue of models, which is the real advantage of factory-built work: the specification is settled before anyone visits your lot, and the variable that remains is site work rather than the building itself.

The Oregon licence has been active since September 2008, longer than most of this market. Two caveats attach to it. It expires on September 26, 2026, close enough that I would confirm renewal rather than assume it, and the licensee is registered at CCB as a corporation of Washington operating into Oregon. That is entirely legitimate and quite normal for a Portland and Vancouver operator straddling the river, but your builder is not local in the way Shelter Solutions or Arciform are.

One thing Oregon does not let you check, which is worth knowing. California maintains a specific C47 Manufactured Housing classification, so you can verify a prefab builder is licensed for factory-built work. Oregon has no equivalent endorsement, so there is no box to tick here. Ask instead who certifies the factory and under which programme.

Catalyst Construction & Remodeling LLC holds an active CCB licence, number 201387, issued December 2013, with $1,000,000 of liability insurance and a $25,000 residential bond on file. On its own that is a perfectly ordinary sound record.

The reason they carry no best-for tag is the name. Searching CCB for Catalyst Construction returns five separate Oregon licences: this active LLC, plus Catalyst Construction Inc and Catalyst Construction LLC, both expired after a lapse, an expired sole-proprietor licence, and Catalyst Construction Management Inc sitting on an inactive sabbatical status. None of that is evidence of wrongdoing, and companies restructure constantly. It is a genuine identification hazard.

So do the boring thing here. Get the CCB number in writing, confirm it reads 201387, and confirm the entity name on your contract is Catalyst Construction & Remodeling LLC and not one of the other four. If you are checking a Portland builder yourself and the name search returns a crowd, that is the moment to slow down rather than pick the first row.

The Powell Group holds an active CCB licence issued January 2019, with liability insurance and a bond both on file. The state’s record gives me no reason to leave them off this page.

The reviews give me a reason not to recommend them. 3.9 across 7 reviews is the lowest score here, and while seven reviews is far too small a sample to be conclusive either way, it is the only independent evidence available and it points down rather than up. I would rather show you that than quietly drop them and leave you to find the same profile yourself.

They also hold a second, expired Oregon licence under the same name, number 198397, first issued in 2012. As with Catalyst, that is common and usually just an entity change. Confirm the number on your contract is 223804.