Cost to Bump-Out Addition in Portland, OR (2026)
If you’re budgeting a bump-out addition in Portland, most projects run $11,370-$56,851, 14% above the $22,000 national average. What moves that number most is usually one thing: Foundation Type. On its own it can swing the cost by $0 - $15,000, so that’s the decision to slow down on before you sweat the smaller stuff.
Easiest place to save: Keep the bump-out to 2 feet or less so it can cantilever off existing framing - this eliminates foundation costs entirely.
$11,370-$56,851 in Portland
14% above the national average · 1.14x cost multiplier
In Portland, a bump-out addition runs $11,370 to $56,851 on average - about 14% above what homeowners pay nationwide. The West Coast market's labor costs account for most of the gap, with material pricing and local permitting fees adding to the spread. Use the cost table below to compare budget, mid-range, and premium options side by side.
Cost Breakdown in Portland
| Line Item | Low | Mid | High |
|---|---|---|---|
| Cost per sq ft | $102 | $182 | $284 |
| Materials | $4,360 | $9,265 | $19,620 |
| Labor | $7,126 | $13,064 | $26,128 |
| Permits | $1,308 | $2,180 | $3,270 |
| Design | $872 | $1,635 | $3,270 |
| Total | $13,666+14% vs. national avg | $26,144+14% vs. national avg | $52,288+14% vs. national avg |
Budget
Small 60-80 sq ft bump-out, cantilevered over existing foundation, no foundation work needed, standard materials matching existing siding.
Mid-Range
100-150 sq ft bump-out with foundation piers or slab extension, mid-grade finishes, energy-efficient windows, basic electrical.
Premium
200+ sq ft bump-out with full concrete foundation, premium materials, custom windows, dedicated heating/cooling, high-end finishes.
Material Options
Material prices below are national averages; availability in Portland may shift costs slightly.
| Material | Cost/Unit | Best For |
|---|---|---|
| Cantilevered (No New Foundation) | $90-$130 per sq ft | Small bathroom, closet, or bay window expansions of 2-3 feet depthLowest cost option, no excavation or foundation work, fastest construction |
| Concrete Pier Foundation | $110-$160 per sq ft | Bump-outs of 3-6 feet depth in moderate climatesGood for medium-sized bump-outs, minimal excavation, stable support |
| Poured Concrete Slab | $130-$190 per sq ft | Kitchen or family room bump-outs where a durable floor is neededSolid, stable, can support any size addition, good for kitchen/dining expansions |
| Full Perimeter Foundation | $160-$250 per sq ft | Large bump-outs over 150 sq ft or in areas with challenging soil conditionsMost stable, allows crawl space access, supports heavy loads and large bump-outs |
Other Projects in Portland
Portland Estimate
Typical Range
$11,370-$56,851
vs. National Average
14% above national
Cost Multiplier
1.14x
Cost Per sq ft
$102-$284
This 1.14x estimate prices Portland labor from BLS Occupational Employment and Wage Statistics (May 2025) and applies a lighter regional adjustment to materials and permits, which vary less by metro than labor does. Actual bids vary by contractor, project scope, and timing.
See national average costs →