When the house you love runs out of room, the answer is often to grow it rather than leave it. We match you with home addition contractors portland metro homeowners have already trusted with dormers, bump-outs, and full second stories — every one of them CCB-licensed and insurance-verified.
Portland's urban growth boundary keeps buildable lots scarce, and trading up often means giving up a low interest rate and a neighborhood you like. A well-built addition — a primary suite over the garage, a family-room bump-out, a finished dormer — adds the space without the move. The right general contractor will tell you early whether your lot's setbacks and your foundation can carry the plan.
A home addition touches structure, roofline, siding, electrical, plumbing, and HVAC at once, which is why it's general contractor territory rather than a handyman job. Experienced home addition contractors portland metro wide will run the engineering review, pull the permits, sequence the subs, and tie the new roof and siding into the old so the seam disappears.
We check each contractor's Oregon CCB license, bond, and complaint record against the state registry before matching, and we favor pros with documented addition work — not just remodels. Your request goes to two to four of them, never to a bulk list.
Design and permitting commonly take two to four months before ground breaks, and construction on a mid-size addition typically runs three to six more. Contractors who work the metro's permit offices weekly will give you a schedule that survives contact with reality — ask each bidder how they handle inspection scheduling.
Inside Portland, additions go through the Bureau of Development Services with plan review; in Beaverton, Lake Oswego, or Clackamas County you'll file with that jurisdiction instead. Setback, height, and lot-coverage rules differ by zone, so confirm which office governs your parcel before paying for drawings.
Much of the close-in metro is 1900s–1940s housing — Craftsman bungalows and Old Portland foursquares on unreinforced foundations, sometimes with knob-and-tube wiring still live. Good addition contractors budget for a structural assessment and possible seismic or panel upgrades before framing anything new.
An addition opens your roofline and envelope to Pacific Northwest weather, so local pros plan weather-tight milestones, temporary roofing, and drainage tie-ins around the October-to-June wet season. Summer starts are popular — book design work the preceding winter to get on a good contractor's calendar.
Most Portland-metro additions land between roughly $250 and $450+ per square foot built, so a 400 sq ft family-room addition often runs $100,000–$180,000 and second-story work trends higher. Foundation conditions, bathroom or kitchen plumbing in the new space, roofline complexity, and your city's permit and system-development charges move the number most. Treat any bid far below this range with caution, and get every assumption in writing.
Either can work. Many home addition contractors portland metro homeowners hire offer design-build, keeping drawings, engineering, and construction under one contract. For complex second stories or historic districts, an independent architect plus a GC is common. Ask each bidder which model they run and what design fees look like.
Sometimes. Plan review can require panel upgrades, smoke/CO detector updates, or energy-code compliance on connected systems, and older foundations may need reinforcement to carry a second story. A contractor who has run additions through your specific city's permit office will flag these before you commit.
Usually yes for bump-outs and side additions, since crews work outside the existing envelope until the tie-in. Second-story additions are more disruptive — expect stretches without roof over parts of the house — and some families budget for a short rental during the roughest weeks. Ask each contractor how they stage the work.
An attached addition expands your living space under one roof; an ADU is a separate legal dwelling with its own kitchen and entrance, governed by different Portland-area rules and fee waivers. If you're weighing both, say so in your request — several contractors in our network build both and can price the comparison.
Two to four is the sweet spot for an addition. Initial consultations and rough estimates are typically free; detailed design-stage pricing may carry a fee that's often credited if you proceed. Our matching itself never costs homeowners anything.
Describe the addition once — size, purpose, rough budget — and we'll put it in front of a short list of CCB-licensed general contractors who build additions in your part of the metro. No fee, no obligation, no number-blasting.
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