Add a second story to a Portland older home: the project workflow

A second-story addition on a Portland bungalow is a 14 to 24 month project that pulls you through PP&D's residential addition track, two trade-permit paths run by your subs, the federal lead RRP rule, Oregon DEQ's asbestos program, an existing foundation that may or may not carry the new load, and — almost certainly — a family that has to move out for six to twelve months. This is the workflow most owners run through, in the order most builders recommend. Click any step on the project map to read the detail. Steps stacked side-by-side run in parallel.

1. Phase 0

   Feasibility

   Before you pay anyone, confirm the addition is actually allowed and the house is actually a candidate. Five free or near-free checks that take 2–4 weeks and tell you whether to keep going.

   2-4 weeks·Free to ~$600 (test kits)·5 steps
   1. 3 in parallel
      0.1Confirm zoning, height, setbacks, and building coverage for your lotPull your parcel up on Portland Maps and read the dimensional rules in Title 33 for your zone — height, setbacks, and building coverage tell you whether a second story actually fits before you spend a dollar.Homeowner1-2 days · Free0.2Pull PP&D permit and code-compliance history for your addressRun your address through PP&D's permit and inspection records to find every prior permit, code-compliance case, or open notice on the property. Free, takes about 15 minutes, surfaces things that would otherwise blow up the project mid-build.Homeowner15 minutes · Free0.3Check historic, conservation, and demolition-delay overlaysPortland Maps surfaces every overlay touching your parcel — historic district, conservation district, environmental zones, and the residential demolition delay. About 15 minutes, and it tells you whether the project needs a separate review track or a 35-day notice before you can start demo.Homeowner15-30 minutes · Free
   2. 2 in parallel
      0.4Walk the house with an experienced Portland addition builderGet a builder who's actually done a Portland pop-up to walk through the house with you for an hour. They'll tell you in 60 minutes what would otherwise take you four months of design fees to discover.Homeowner, General contractor1-2 hours · Free (most do free walk-throughs)0.5Pre-screen the house for lead and asbestosIf the house was built before 1978, federal lead RRP rules apply during construction; before 1981, Oregon DEQ asbestos rules apply during demo. A $200–$600 mail-in test confirms what you're dealing with so the bid can include the right abatement scope.Homeowner2-3 weeks (mail-in lab turnaround) · $200-$600
2. Phase 1

   Site and existing conditions

   You can't design a second story onto a house no one has measured. Survey the lot, draw the existing house accurately, get an engineer to look at the foundation, and pull in a geotech if the lot is on a slope or in an environmental zone.

   4-8 weeks·$4,000-$15,000·4 steps
   1. 2 in parallel
      1.1Order a boundary and topographic surveyA licensed Oregon land surveyor sets the lot corners, shoots topography, and locates the existing house relative to setbacks. PP&D will require this for the permit submittal anyway.Surveyor2-3 weeks · $1,500-$3,5001.2Have the designer field-measure the existing houseYour designer (or a measurement service they hire) measures every existing wall, ceiling height, window, door, and rough opening. This becomes the existing-conditions sheet in the permit set.Designer1-2 days on-site, 2-3 weeks to draw · $1,500-$4,000 (often included in design fee)
   2. 2 in parallel
      1.3Get a structural engineer's foundation assessmentA licensed Oregon structural engineer inspects the existing foundation, evaluates whether it can carry a second-story load, and recommends one of three paths: keep, retrofit in place, or full lift.Structural eng.2-4 weeks · $1,500-$3,500 (assessment only; full design comes later)1.4Order a geotech report if the lot is on a slope or in an e-zoneLots in environmental overlays, on slopes >15%, or with known landslide hazards need a geotechnical engineer's site investigation before design. Flat inner-east-side lots usually don't.Geotech eng.3-5 weeks · $2,500-$6,000
3. Phase 2

   Design and engineering

   This is the long phase. Engage a designer with Portland addition experience, decide retrofit-vs-lift on the foundation, develop schematic to permit-set, get the structural engineer's full design, and verify ORSC energy compliance for the alteration.

   4-8 months·$25,000-$60,000·5 steps
   1. 2.1Engage a designer or architect with Portland addition experienceAn architect or designer who's finished Portland additions on older houses runs the design phase, coordinates the structural engineer and energy consultant, and shepherds the PP&D submittal through correction loops.Designer, Architect1-3 weeks to hire · Design fee 10-15% of construction cost ($25K-$75K typical)
   2. 2.2Make the lift-vs-retrofit foundation decisionTake the structural engineer's assessment and pick a path: retrofit in place, lift and replace foundation, or lift + new ground floor. The decision shapes everything downstream — design, schedule, budget, and what the family does for housing during the build.Homeowner, Structural eng., Designer1-2 weeks · Free (decision) — affects construction cost by $50K-$150K
   3. 3 in parallel
      2.3Schematic design through design developmentDesigner takes the program (rooms, sizes, adjacencies) and produces preliminary plans, elevations, and a model. You iterate. By the end you have a building that fits the lot, fits the budget, and fits the family.Designer, Homeowner8-16 weeks · Included in design fee2.4Structural engineering — full designThe structural engineer designs the foundation work, the new floor and roof framing, the lateral system, and any retrofits to the existing house. Stamped drawings and calcs become part of the permit set.Structural eng.6-10 weeks · $5,000-$15,0002.5Verify ORSC energy compliance for the alterationThe Oregon Residential Specialty Code's energy chapter applies to additions and alterations. An energy consultant or your designer runs the compliance path, sizes equipment, and produces the documentation PP&D wants in the submittal.Energy consultant, Designer2-4 weeks · $1,000-$3,500
4. Phase 3

   Permits and approvals

   Submit the permit-ready set to PP&D, kick off the trade sub-permits, navigate any tree review or historic review that applies, and respond to corrections. Plan for 1–3 correction cycles; HD/CD lots may run longer.

   3-7 months·$8,000-$25,000 (PP&D fees + sub-permit fees + minor SDCs if any)·4 steps
   1. 3.1Submit the Major Residential Addition permit to PP&DDesigner uploads the permit set, structural calcs, geotech (if any), energy compliance, and survey to PP&D's permitting portal. PP&D triages, charges intake fees, and assigns the application to reviewers.Designer, PP&D, Homeowner2-3 weeks to intake; 6-10 weeks to first review · Intake $500-$1,500 + plan review fees pro-rated to project value
   2. 3.2Kick off the trade sub-permits (electrical, plumbing, mechanical)Oregon issues separate trade permits to the licensed trades, not under a master permit to the GC. Your electrician, plumber, and HVAC contractor each pull their own permit when they're ready to start work.Electrician, Plumber, HVAC contractorRun in parallel with building permit; each issues in 1-2 weeks · $300-$1,500 per trade
   3. 3.3Tree review (Title 11) and Historic Resource Review if overlay appliesUrban Forestry reviews any work near regulated trees; Historic Resource staff review additions in HD/CD overlays. Both run in parallel with the building permit. Either can be the long pole.Urban Forestry, PP&DTree: 2-6 weeks; Historic: 8-24 weeks · Tree: $100-$1,500; Historic: $1,500-$5,000 (Type II) or $5,000-$15,000 (Type III)
   4. 3.4Respond to PP&D correction letters (1-3 cycles typical)Your designer turns PP&D's review comments into revised drawings and a response letter. Each cycle is 4-8 weeks. Most additions clear in 1-3 cycles; HD/CD or e-zone projects can run longer.Designer, Architect, PP&D4-8 weeks per cycle, 1-3 cycles typical · Included in design fee; PP&D hourly rates apply if review goes long
5. Phase 4

   Bid and contract

   Send the permit-ready set to three to five GCs who've actually finished Portland additions on older houses. Verify them, negotiate the contract, sign it, bind insurance, and figure out where the family lives during the build.

   6-10 weeks·$2,000-$8,000 (insurance + attorney + temporary housing setup)·4 steps
   1. 4.1Solicit bids from 3-5 Portland older-home addition GCsSend your permit-ready plans to three to five GCs who've actually built second-story additions on older Portland houses, and ask them all to bid the same scope so you can compare apples to apples.Homeowner, General contractor3-4 weeks · Free
   2. 4.2Verify GC license, bond, insurance, and Portland addition historyPull Oregon CCB status (active, bonded, insured), check recent Portland addition permits, confirm RRP certification if your house is pre-1978, and walk one finished project. About 30 minutes plus a site visit.Homeowner1-2 days · Free
   3. 4.3Negotiate and sign the GC contractFixed-price is what most owners want. Cost-plus only works with a guaranteed maximum price (GMP) cap and weekly itemized invoices. On addition contracts (almost always over $300K), an attorney review pays for itself.Homeowner, General contractor, Attorney1-2 weeks · $1,000-$4,000 if attorney-reviewed
   4. 4.4Bind builder's risk + line up where the family livesGet the builder's risk policy in place before the GC mobilizes, and decide whether you're sheltering in place or moving out for 6-12 months. For most second-story additions, the answer is moving out.Insurance, Lender, Homeowner2-4 weeks · $800-$2,500 builder's risk + $20K-$60K temporary housing
6. Phase 5

   Build

   Six to twelve months of construction. Abatement first, then foundation work, then framing, then MEP rough, then insulation and drywall and finishes, then the inspection sequence that gets you to substantial completion.

   6-12 months·Built into the GC contract; allowance lines true up against actual·6 steps
   1. 5.1Lead and asbestos abatementBefore any meaningful demo, the asbestos abatement contractor (separate DEQ-licensed sub) and lead-RRP-certified GC handle the regulated materials. Two to four weeks; produces clearance documentation.General contractor2-4 weeks · $5,000-$30,000 (varies with how much asbestos and lead is present)
   2. 5.2Foundation work or full liftPer the path chosen in step 2.2: pour the retrofit work, or lift the house and replace the foundation, or lift and build a new ground floor. The longest variable in the build phase.General contractor, Structural eng.4-14 weeks (depends on path) · Built into GC contract; foundation path adder $25K-$200K
   3. 5.3Demolition and framingRoof comes off, second story goes up, new roof goes on, and the house is dried in. The most visible phase of the build and usually the longest single phase.General contractor8-16 weeks · Built into GC contract
   4. 5.4MEP rough-in + service upgrades (PGE, NW Natural)Electrical, plumbing, and mechanical roughs go in the open framing. PGE upgrades the electric service if needed; NW Natural modifies the gas line if scope touches it. All inspected before drywall.Electrician, Plumber, HVAC contractor, Portland General Electric, NW Natural6-10 weeks · Built into GC contract; PGE service upgrade $0-$5,000 typical
   5. 5.5Insulation, drywall, and finishesWalls and ceilings get insulated, drywalled, taped, primed, painted, and trimmed. Floors go down, cabinets and counters and tile go in, fixtures get set. The longest internal phase — six to twelve weeks of finish work.General contractor10-16 weeks · Built into GC contract; allowances true up against actual
   6. 5.6Final inspections and tests (energy, blower-door, mechanical)ORSC-required tests and inspections before final occupancy: blower-door air leakage test, duct leakage test (if required), final mechanical, final plumbing, final electrical, final building.General contractor, Energy consultant, PP&D1-2 weeks · Built into GC contract; testing fees $400-$1,000
7. Phase 6

   Final inspection, move back in, and home record

   Certificate of Occupancy issues, the family moves back in, the warranty walk happens, and the addition becomes part of the permanent home record.

   3-6 weeks·Move-back logistics + minor punch-list items·3 steps
   1. 6.1Final building inspection and Certificate of OccupancyPP&D's final building inspector signs off on the project. The Certificate of Occupancy (CofO) is the legal document that says you can move in.PP&D, General contractor1-2 weeks · Included in permit fees
   2. 6.2Move back in and conduct the warranty walkMove the family back, live with the new house for two to four weeks, then walk the project with the GC to identify warranty items. Most contracts cover one year of workmanship; document items as you find them.Homeowner, General contractor2-4 weeks · Move-back logistics + minor punch-list
   3. 6.3Update the home record with addition documentationAdd the addition's permit set, certificate of occupancy, structural and energy documentation, abatement records, and warranty paperwork to your home record. Future buyers, insurers, and your own future self will all need it.Homeowner1-2 hours · Free