Published timelines from SDCI tell you how long permit review takes. They do not tell you how long a project takes from first application to final inspection. BuildVue tracks both dates for 128 completed multi-family and mixed-use projects in Seattle. The results are longer than most people expect.
The Real Numbers
The median project duration from earliest permit application to certificate of occupancy is 60 months. Five years.
| Metric | Duration |
|---|
| Median (all completed projects) | 60 months (5.0 years) |
| Mean | 64 months (5.3 years) |
| 25th percentile | 47 months (3.9 years) |
| 75th percentile | 81 months (6.8 years) |
These numbers cover the full lifecycle: land use application, design review, building permit review, corrections, construction, and final inspection.
The Two Halves
The five-year median splits nearly evenly between pre-construction and construction.
| Phase | Median | 25th percentile | 75th percentile |
|---|
| Pre-construction | 27 months (2.3 years) | 19 months | 37 months |
| Construction | 30 months (2.5 years) | 24 months | 39 months |
Pre-construction includes land use approval, design review, SEPA, building permit review, and all correction cycles. Construction runs from permit issuance to final inspection.
The pre-construction phase has more variability relative to its length. The gap between the 25th and 75th percentile is nearly 2x (19 to 37 months), while construction spans about 1.6x (24 to 39 months). Permitting is the less predictable half.
By Project Size
Project size has less effect on total duration than most people assume.
| Size | Projects | Median total | Median pre-construction | Median construction |
|---|
| Small (1 to 50 units) | 39 | 60 months | 26 months | 33 months |
| Medium (51 to 200 units) | 50 | 63 months | 30 months | 31 months |
| Large (200+ units) | 18 | 63 months | 30 months | 35 months |
Small projects spend less time in pre-construction but have slightly longer construction relative to their size. Large projects have the longest construction phase at a median of 35 months, but the gap between small and large is only 3 months at the median.
What Pushes Projects Past 5 Years
One in four projects takes longer than 6.8 years. Several factors drive the difference.
Design review adds the most time. Projects that trigger design review (8+ units in LR zones) add 12 to 24 months to the pre-construction phase. A revise and resubmit recommendation from the board adds another 3 to 6 months for a third meeting.
SEPA appeals can freeze a project. A SEPA appeal sends the project to the Hearing Examiner, stalling progress for 6 to 12 months regardless of the outcome.
Correction cycles during permit review. Each round of corrections from SDCI adds 4 to 8 weeks. Two or three rounds add up fast.
Financing gaps between permit and construction. Some developers hold an approved permit for months or years before breaking ground, waiting for interest rates, pre-leasing commitments, or a construction loan closing.
The Fastest and Slowest
The fastest completed projects finished in about 15 to 26 months. These are smaller projects with streamlined permitting and quick construction.
The slowest in the dataset took over 10 years. These are projects that accumulated design review delays, SEPA appeals, financing gaps, and extended construction schedules.
What This Means for Underwriting
If you are modeling a project pro forma, a 5-year total timeline means 5 years of land carry, property taxes, and opportunity cost before units generate revenue. Using a 3-year assumption understates carrying costs by 40 percent or more. The difference can determine whether a project pencils.
Explore Project Timelines
Every project on BuildVue shows its full permit timeline, from first application to current status. You can see which phase each project is in and how long it has been there.
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