Building Permit Fees in Seattle, WA (2026)

• Typical $12,000: DFI $501 → building permit $501 + STFI plan review $200.40 (40% of DFI) + technology $35.07 (5%, SMC 22.900A.100) + WA BCC $6.50 (RCW 19.27.085) = $742.97 (Seattle SDCI 2026 Fee Subtitle Tables D-1 and D-2; STFI path: 100% building permit + 40% plan review of DFI; source retrieved Oct 18, 2026).
• Low $8,000 valuation = $648.89 total.

That low band reconciles to whole-dollar DFI $437: building permit $437.00 (100% of DFI), plus STFI plan review $174.80 (40% of DFI), plus technology $30.59 (5% of the $611.80 permit and plan-review subtotal), plus WA BCC $6.50, equals $648.89. And high $22,000 valuation = $978.17 total.

That high band reconciles to whole-dollar DFI $661: building permit $661.00 (100% of DFI), plus STFI plan review $264.40 (40% of DFI), plus technology $46.27 (5% of the $925.40 permit and plan-review subtotal), plus WA BCC $6.50, equals $978.17. Each listed band is the STFI like-for-like reroof path.

The rule is a building permit at 100% of DFI, plus plan review at 40% of DFI, times 1.05 for the technology fee, plus the flat $6.50 WA BCC. Alternate path not used in listed totals: full plan review (200% of DFI) for structural changes or layered roofs when STFI is ineligible; confirm STFI eligibility with SDCI before filing.

Like-for-like furnace/heat-pump swap uses the Seattle SDCI 2026 Fee Subtitle (SMC 22.900) Table D-8 (22.900D.090) mechanical equipment fee, not the valuation DFI (source retrieved Oct 18, 2026). Table D-8 charges a fixed per-unit amount of $60.35 for each forced-air furnace, heat pump, or similar unit, including ducts attached thereto.

The 5% technology fee under SMC 22.900A.100 is applied to that Table D-8 subtotal and is included in every listed band.

• Low 1 unit is one forced-air furnace, heat pump, or similar unit, including ducts attached thereto: 1 × $60.35 = $60.35, plus the 5% technology fee $3.02 (SMC 22.900A.100), and $60.35 + $3.02 = $63.37.
• Typical 2 units (furnace + AC or two heat-pump outdoor/indoor): 2 × $60.35 Table D-8 = $120.70; the official 5% technology fee is $6.04 (SMC 22.900A.100); the official total is $126.73, which matches the official path 2 × $60.35 × 1.05.

That $120.70 is the Mechanical equipment fee (Table D-8) extra on this row, and that $6.04 is the Technology fee (5%) extra; both are included in the typical fee, so they are not added again.

• High 3 units is three units on that same per-unit Table D-8 basis (forced-air furnace, heat pump, or similar, including ducts attached thereto): 3 × $60.35 = $181.05, plus the 5% technology fee $9.05 (SMC 22.900A.100), and $181.05 + $9.05 = $190.10.

The low, typical, and high bands are therefore 1 × $60.35 × 1.05 → $63.37, 2 × $60.35 × 1.05 → $126.73, and 3 × $60.35 × 1.05 → $190.10. The per-unit charge covers ducts attached to that equipment; this row is not the Table D-2 valuation path.

Excluded from these totals: a separate Table D-14 / OTC electrical permit if new circuits or disconnects, and new duct systems submitted separately, which use Table D-2 (valuation) instead of the Table D-8 per-unit mechanical equipment fee. Amounts for those alternates were not listed as fee lines.

Confirm path with SDCI.

• Typical $12,000: Tables D-1 and D-2 set DFI at $501 (Seattle SDCI 2026 Fee Subtitle, SMC 22.900; source retrieved Oct 18, 2026).

On the official path the building permit is 100% of DFI and plan review is 100% of DFI. That is the full plan-review path: 100% building permit + 100% plan review of DFI, or 200% of DFI.

Building plus plan review is the $1,002 building+plan subtotal. The technology fee is 5% of that $1,002.

The WA State Building Code Council fee is a flat $6.50 when a building permit is issued, at low, typical, and high. Add the official pieces: DFI $501, building permit $501 + plan review $501 (100% of DFI) + technology $50.10 (5%, SMC 22.900A.100) + WA BCC $6.50 (RCW 19.27.085) = $1,058.60.

That is the official typical fee at the $12,000 typical project value.

• Low $8,000 valuation = $924.20 total ($437 building + $437 plan + $43.70 tech + $6.50 WA BCC).

At $8,000 the DFI is $437. Building permit $437 plus plan review $437 is $874.

Technology is 5% of $874, which is $43.70. Add the flat $6.50 WA BCC and the low total is $924.20.

The high $19,200 valuation = $1,300.52 total ($616.20 building + $616.20 plan + $61.62 tech + $6.50 WA BCC). At $19,200 the DFI is $616.20.

Building permit $616.20 plus plan review $616.20 is $1,232.40. Technology is 5% of $1,232.40, which is $61.62.

Add the flat $6.50 WA BCC and the high total is $1,300.52. Listed totals use that full plan review (200% of DFI), not the STFI 40% plan-review / ~140% of DFI path.

Simple, prescriptive, or ground-level decks may qualify as STFI with ~140% of DFI (100% building permit + 40% plan review) instead of 200% of DFI. Alternate paths not used in listed totals: STFI / simple-prescriptive / ground-level decks at ~140% of DFI (no published amount); decks under 30 inches above grade that may not need a building permit (no published amount).

No separate STFI dollar total is listed. Decks over 30 inches above grade generally need a building permit.

A deck under 30 inches above grade may not need a building permit, and that path is not assumed in the official bands. These figures are the building-permit portion only.

Confirm deck height, STFI eligibility, and current SDCI fees with SDCI before filing.

• Typical $35,000: Tables D-1 and D-2 set DFI at $864 (Seattle SDCI 2026 Fee Subtitle, SMC 22.900; source retrieved Oct 18, 2026).

On the official path the building permit is 100% of DFI and plan review is 100% of DFI. That is the full plan-review path: 100% building permit + 100% plan review of DFI, or 200% of DFI.

It is not the STFI 40% plan-review path used for like-for-like reroofs. Building plus plan review is the $1,728 building+plan subtotal.

The technology fee is 5% of that $1,728. The WA State Building Code Council fee is a flat $6.50 when a building permit is issued, at low, typical, and high.

Add the official pieces: DFI $864, building permit $864 + plan review $864 (100% of DFI) + technology $86.40 (5%, SMC 22.900A.100) + WA BCC $6.50 (RCW 19.27.085) = $1,820.90. That is the official typical fee at the $35,000 typical project value.

• Low $15,000 valuation = $1,159.40 total ($549 building + $549 plan + $54.90 tech + $6.50 WA BCC).

At $15,000 the DFI is $549. Building permit $549 plus plan review $549 is $1,098.

Technology is 5% of $1,098, which is $54.90. Add the flat $6.50 WA BCC and the low total is $1,159.40.

The high $75,000 valuation = $3,096.65 total ($1,471.50 building + $1,471.50 plan + $147.15 tech + $6.50 WA BCC). At $75,000 the DFI is $1,471.50.

Building permit $1,471.50 plus plan review $1,471.50 is $2,943. Technology is 5% of $2,943, which is $147.15.

Add the flat $6.50 WA BCC and the high total is $3,096.65. Listed totals use that full plan review (200% of DFI), not the STFI 40% plan-review path used for like-for-like reroofs.

Like-for-like reroofs use plan review at 40% of DFI; this kitchen remodel uses full plan review instead. Cosmetic cabinet-only same-layout work may not need a building permit.

Alternate paths not used in listed totals: separate electrical (Table D-14 / OTC), King County Public Health plumbing (not SDCI), and separate mechanical (Table D-8 / D-2 if range hood or HVAC changes are not in the building plans). Those amounts were not listed as fee lines.

These figures are the building-permit portion only. Confirm the kitchen permit path with SDCI before filing.