Finding a contractor for an addition is harder than finding one for an interior remodel. Additions involve foundation, structural framing, roof tie-in, exterior envelope, and a permit process that’s more involved than most remodels. Not every contractor who does kitchens is set up for additions. Here’s how to find one who is.
1. Look for addition-specific experience, not just remodeling generally
“Remodeler” is a broad term. Some remodelers stay inside the existing envelope: kitchens, bathrooms, finished basements, layout reworks. Others do additions: cutting roofs open, tying new framing into old, pouring foundation against existing foundation, matching siding and trim. The skill sets overlap but they’re not identical, and a contractor who’s done 30 kitchens and zero additions is not the right pick.
When you call to inquire, ask directly: “How many additions has your team built in the last three years, and can you walk me through two of them?” You’re not just hearing the number. You’re listening for whether they can talk about additions specifically, with the structural and detailing language that comes from having done them. A contractor who pivots immediately to talking about the kitchen in a recent addition isn’t telling you what you asked.
2. Verify the license, insurance, and bond
In Oregon, residential construction contractors are licensed by the Construction Contractors Board (CCB). For an addition, you want:
- An active CCB license (verify at the CCB online lookup)
- Current general liability insurance with you named as an additional insured for the job
- The contractor’s bond status, also visible in the CCB lookup
- Workers’ compensation, if they have employees (and they should)
- EPA Lead-Safe Renovator certification, if the existing house was built before 1978 (the federal RRP rule applies to the tie-in work where you’re disturbing existing painted surfaces)
Keyser Construction is CCB #121142 in Oregon, KEYSEC 19680J in Washington, EPA Lead-Safe Renovator Certified, and BBB A+ accredited since 2007.
3. Look at how they handle the design and permit phase
Additions almost always go through some kind of formal permit review, and many require structural engineering, energy code calculations, and (depending on the jurisdiction) design review. A contractor who treats the permit phase as a passive wait period is going to leave gaps. The contractor you want is the one who actively manages the application: prepares the submittal package thoroughly, responds to plan-check comments quickly, and knows the local jurisdiction’s quirks.
Ask candidates:
- Who prepares the plans? In-house designer, partner architect, or your own architect?
- Who pulls the permit?
- How do you handle plan-check corrections?
- What’s a typical permit timeline for an addition like mine in this jurisdiction?
The contractor who can’t answer the timeline question off the top of their head probably hasn’t done many additions in your area lately.
4. Talk about the tie-in details before you talk about the finishes
The single biggest difference between a great addition and a mediocre one is how well it ties into the existing house. From the street, the addition shouldn’t read as an addition. The roof line, the siding, the trim, the window proportions, the rake and eave details should match the original house closely enough that you can’t easily tell where the old ends and the new begins.
That requires:
- Careful matching of siding profile and material (and good repair of the existing siding at the seam)
- Roof framing that integrates the new pitch with the existing slopes, not just butts up against it
- Trim and corner details that wrap consistently
- Foundation that’s tied properly to existing foundation, with attention to differential settling
- Interior finishes (floor, ceiling, trim) that align with the existing rooms or transition cleanly
Ask candidates to show you photos of past additions specifically at the seam, where new meets old. A great contractor will be proud of those photos. A mediocre one will only have the wide shots.
5. Get references on additions specifically
References for kitchens and references for additions tell you different things. When you ask for references, ask for them on past addition projects, and ask the references questions that get at the addition-specific issues:
- How did the tie-in go? Was the existing house respected, or was there collateral damage?
- Was the new space comfortable from day one, or were there ongoing issues with temperature, drafts, or moisture?
- How was the construction experience? Were you able to stay in the house?
- If the addition added bedrooms or square footage, did your insurance, taxes, and utilities update cleanly afterward?
- How has the addition held up after 2 to 5 years?
6. Get apples-to-apples bids
For comparison shopping to be meaningful, the bids need to cover the same scope at the same level of detail. The most common reason addition bids look wildly different is that they aren’t pricing the same job.
Look specifically at:
- Excavation and foundation: footing depth, foundation type, drainage detail
- Structural framing: engineered beams, hangers, structural sheathing, shear walls
- Roof: is it tearing off and re-roofing the existing portion at the tie-in, or just patching?
- Siding: complete re-side of the affected wall, or just patching at the addition?
- Electrical: a sub-panel, a service upgrade, or just new circuits from the existing panel?
- HVAC: extending existing system, adding a mini-split, or running a new zone?
- Insulation: what R-values, and does it meet current Oregon energy code?
- Permits, SDC fees, and engineering: included in the bid, or pass-through?
If two bids look dramatically different on a line item, that’s where to ask questions.
7. Plan for the timeline honestly
A typical 400 to 800 square foot residential addition in the Portland metro runs:
- Design and permitting: 3 to 6 months
- Site work and foundation: 3 to 5 weeks
- Framing through dry-in: 4 to 8 weeks
- Rough-in (electrical, plumbing, HVAC): 3 to 5 weeks
- Insulation, drywall, trim, paint: 5 to 8 weeks
- Finishes and finals: 4 to 8 weeks
Total: 9 to 18 months from first design meeting to final inspection. Contractors who promise faster than that are either taking shortcuts or telling you what you want to hear.
If you’re working through your contractor short list on an addition, we’d be glad to be one of the bids. Reach out and we’ll set up a walk-through. Keyser Construction has been building additions on Portland-area homes for decades.