Solicit bids from 3-5 Portland older-home addition GCs

Before you read any bids: the empirical reality

Industry surveys are consistent: more than one in three homeowners (37% per Houzz's 2025 U.S. Renovation Trends Study) end up spending more than they planned, versus 35% who finish on budget and just 3% under. Older houses hide more unknowns than new-build, finish-stage upgrades compound late, and corrections from the inspector add line items nobody priced into the bid.

Practical implication: budget the lump-sum bid + 10–20% contingency, separately. Don't fold the contingency into your project envelope and then "use it up" buying finish upgrades — that's how the contingency disappears and the real overrun arrives. Treat it as an untouched reserve for genuine unknowns (failed soils test, dry rot found at framing, code-correction work).

Before you write the RFP: are you carving out any trades?

If you're thinking about hiring one or two trades directly (appliances, finish hardware, post-CofO landscape) instead of running everything through the GC, read Splitting scope between your GC and trades you hire directly before you finalize the bid package. A second-story addition is the project type where these carve-outs are riskiest — Oregon's ORS 701.010(6) further constrains permit-bearing work — so the expansion walks through what's actually workable.

Where to find good GCs

You're looking for builders who've finished a second-story addition (not just a kitchen remodel, not just a DADU) on a Portland older house in the last few years. Three places to look:

1. Recent permit history. Portland Maps lets you search permits by type and neighborhood. Filter for "Residential Addition" permits in the last 3 years; the contractor names that show up over and over are your local specialists. This is the single best list.
2. Your designer's short list. Your designer has worked with several GCs on Portland additions and knows who's good to work with. Ask. It'll be a short list, biased toward GCs who collaborate well — which is what you want.
3. GCs who publish their work. A handful of Portland builders post detailed project diaries — read how they think before you call them.

Aim for three to five bids. Three gives you a real comparison. Five gives you negotiating room.

Send everyone the same package

Every GC has to be bidding the same thing. Otherwise you're not comparing prices — you're comparing different additions.

The "same thing" means:

• The same permit-ready plan set (same sheets, same revision, same date).
• The same abatement scope (lead and asbestos report from step 0.5 attached, with abatement called out as a separate line).
• The same foundation strategy (retrofit, lift, or lift + new ground floor — with the engineer's recommendation attached).
• The same allowance lines for finishes, cabinets, fixtures, appliances — with the same dollar amounts called out.
• The same exclusions stated up front (e.g., "no landscape," "no detached garage work," "no driveway").

Reading the bids when they come back

When three to five GCs price the same package, the bids will usually cluster within 10–15% of each other. That's a healthy spread.

If one bid comes in 25%+ below the rest, walk it line-by-line against the median. Almost always the gap is missing scope (a foundation read that assumes simpler retrofit, abatement left out, an allowance dropped) — not a more efficient builder. Add the missing scope back and re-compare.

What it actually costs in 2025–2026

The honest range right now for a Portland second-story addition:

• Envelope-only addition (~600–900 sf new space, retrofit foundation, minimal first-floor work): $300,000–$475,000.
• Typical scope (800–1,200 sf new, modest first-floor reconfiguration, MEP throughout, knob-and-tube remediation): $400,000–$650,000.
• Lift + addition (Option B from step 2.2, new foundation): $525,000–$725,000.
• Lift + new ground floor + addition (Option C, three-story end state): $700,000–$1M+.

You'll see "$200K addition" headlines from before COVID. Don't budget against them.