Residential ADU and addition permits in Boulder, CO
23 residential ADU and addition permits issued by Boulder CO, the 8 weeks ending Oct 16, 2026. Oct 16, 2026 is the latest issue date the source has published.
Quick answer. In the 8 weeks ending Oct 16, 2026, 23 residential ADU and addition permits were issued in Boulder, CO, according to public records from Boulder CO. The busiest ZIP codes were 80303 (7 permits), 80305 (6 permits), 80304 (6 permits). The median declared value was $100,918 across 18 permits that list one. The latest permit date published is Oct 16, 2026.
What an ADU and addition permit means in Boulder
A residential ADU or addition permit is a new unit or more square footage on an existing home. For an ADU builder or addition contractor it shows where lots are being built out, and the subs those jobs need.
In Boulder, permits were issued on 16 different days in the window; the most recent were Oct 15, 2026, Oct 14, 2026, Oct 12, 2026. The busiest ZIPs were 80303 (7), 80305 (6), 80304 (6).
By residential ADU and addition permit count, Boulder ranks #33 of the 49 ADU and addition pages on this site.
- Mail the neighbors of each ADU.
- Pitch trades to the builders pulling the most permits.
- Track declared values by ZIP.
Other work on the same permits
Share of these 23 permits whose type or description also matches another trade. These are the follow-on and partner trades on Boulder jobs.
- garage: 5 permits (22%)
- kitchen/bath remodel: 3 permits (13%)
- deck/patio: 3 permits (13%)
- HVAC: 2 permits (9%)
Weekly trend
Permits per 7-day period, ending Oct 16, 2026. n/c = not collected yet (before our pipeline started pulling this source). It is not zero. Striped bars are partly collected weeks.
Top permit types
| Permit type / subtype | Permits | Share |
|---|---|---|
| Building Permit - Single Family Detached Dwelling | 12 | 52% |
| Utility Permit | 5 | 22% |
| Fire Permit | 3 | 13% |
| Building Permit - Accessory | 3 | 13% |
Busiest ZIP codes
| ZIP | Permits | Share | 8-wk avg / week |
|---|---|---|---|
| 80303 | 7 | 30% | 0.88 |
| 80305 | 6 | 26% | 1.00 |
| 80304 | 6 | 26% | 0.75 |
| 80302 | 1 | 4% | 0.25 |
| 80301 | 1 | 4% | 0.12 |
8-wk avg / week is the trailing 8-week weekly average we quote in coverage checks for that ZIP and trade. It counts every source in the ZIP and includes permits with unknown use, so it can be higher than this page's residential count. 2 permits on this page have no ZIP in the source.
Type stated in the permit
| Type | Permits | Share |
|---|---|---|
| ADU | 14 | 61% |
| room addition | 11 | 48% |
Parsed from the permit's own type and work text. A permit can state more than one; many state none.
Sample rows
Anonymized: street address, permit number and any names removed. Subscribers get the full row with address, permit number and source link.
| Issued | ZIP | Permit type | Scope | Type | Declared value |
|---|---|---|---|---|---|
| 2026-10-15 | 80304 | Building Permit - Single Family Detached Dwelling | plumbing + windows/doors + addition/ADU | room addition | $21,000 |
| 2026-10-12 | 80305 | Building Permit - Single Family Detached Dwelling | addition/ADU + garage | room addition | $65,758 |
| 2026-10-07 | 80303 | Building Permit - Single Family Detached Dwelling | kitchen/bath remodel + addition/ADU | room addition | $175,000 |
| 2026-09-30 | n/p | Utility Permit | addition/ADU + garage | ADU | n/a |
| 2026-09-29 | 80303 | Utility Permit | addition/ADU | ADU; room addition | n/a |
| 2026-09-16 | 80305 | Building Permit - Single Family Detached Dwelling | kitchen/bath remodel + addition/ADU + deck/patio + garage | room addition | $119,000 |
Source
- Boulder CO: Permit records on services.arcgis.com, published by Boulder CO. Source dataset. Collected window(s): Aug 22, 2026 – Oct 16, 2026. Last pulled Oct 18, 2026.
Metric: Residential = the source marks the permit's use as residential (permits with commercial or unknown use are not counted). ADUs & Additions = the permit's type or work description matches the Curbside Signal ADU and addition rules. Counts exclude void or cancelled permits. Dates are the jurisdiction's permit issue date. Records are deduplicated on source and permit number. How we count. Part of the Boulder, CO metro: every trade × city page there.
The honest limit. A permit usually means the job is already sold. We say that up front. The value is what happens around it:
- Neighbor marketing around active jobs: same-age houses on the same street.
- Cross-trade follow-on demand: new roof → solar, gutters, insulation; remodel → HVAC, electrical, landscaping, pool; new build → pest, security, landscaping.
- Competitor intelligence: which contractors pull permits where (where the jurisdiction publishes it), and who to recruit as subs.
- Early-stage projects for commercial trades and GC subs.
Follow-on: ADUs and additions drive HVAC, electrical, plumbing, solar and landscaping work.
Other trades in Boulder, CO
Residential permits in the same window, by trade.
Questions
How many residential ADU and addition permits were issued in Boulder, CO recently?
23 residential ADU and addition permits in the public records we pulled, the 8 weeks ending Oct 16, 2026. Source: Boulder CO.
Which Boulder ZIP codes have the most ADU and addition permits?
80303 (7 permits), 80305 (6 permits), 80304 (6 permits), by residential ADU and addition permit count the 8 weeks ending Oct 16, 2026. 5 ZIP codes had at least one permit.
What is the median declared value of a residential ADU and addition permit in Boulder?
$100,918, across 18 permits that list a valuation. Declared values are what the applicant stated on the permit, not the contract price.
How do I get the Boulder ADU and addition permit list, and what does it cost?
Request a free sample for your ZIPs first. ZIP Pack is $29/mo for one trade and up to 5 ZIPs every Monday; Metro Feed is $99/mo for a whole metro and up to 3 trades, with daily alerts. Guarantee on every package: If a weekly file is late or missing, that month is free. If a month delivers under half the 8-week average permit count for your ZIPs and trade, the next month is free.
Boulder ADU and addition leads, every Monday
Send your trade and ZIP codes. We'll reply with a real sample from the public records we pull, or tell you plainly that we don't cover you yet.