# Building permits at 3 Unionstone Ln, Marin County, CA Five permits on record here. The newest, Jun 18: Replace Mechanical Appliance. Within a quarter mile, the county has issued 10 more permits since May 1. ## At this address | Date | Type | Work | Cost | Permit | |---|---|---|---|---| | Jun 18, 2026 | Mechanical (HVAC) | Replace Mechanical Appliance; | $19,000 | [B47215](https://nearbypermits.com/marin-county/permit/B47215/) | | Jan 27, 2021 | Other | | $27,500 | [166981](https://nearbypermits.com/marin-county/permit/166981/) | | Dec 9, 2020 | Electrical | Service Upgrade; | $3,450 | [B24379](https://nearbypermits.com/marin-county/permit/B24379/) | | Sep 21, 2020 | Other | | $27,500 | [165782](https://nearbypermits.com/marin-county/permit/165782/) | | Dec 12, 2019 | Other | | $25,493 | [163552](https://nearbypermits.com/marin-county/permit/163552/) | ## Within ¼ mi since May 1, 2026 10 permits in the circle. From our copy of the county's data (last 24 months). ### Next door (under 250 ft), 1 permits | Date | Address | Distance | Type | Work | Cost | Permit | |---|---|---|---|---|---|---| | Sep 28, 2026 | [5 Unionstone Ln](https://nearbypermits.com/marin-county/address/5-unionstone-ln/) | 120 ft S | Roofing | ReRoofing; | $40,000 | [B48513](https://nearbypermits.com/marin-county/permit/B48513/) | ### This block (250 to 1,000 ft), 3 permits | Date | Address | Distance | Type | Work | Cost | Permit | |---|---|---|---|---|---|---| | Oct 2, 2026 | [2797 Las Gallinas Ave](https://nearbypermits.com/marin-county/address/2797-las-gallinas-ave/) | 740 ft SE | Electrical | New Circuits / Outlets, Service Upgrade; | $9,823 | [B48627](https://nearbypermits.com/marin-county/permit/B48627/) | | Aug 25, 2026 | [15 Unionstone Dr](https://nearbypermits.com/marin-county/address/15-unionstone-dr/) | 790 ft SE | Mechanical (HVAC) | Replace Mechanical Appliance; | $8,617 | [B48059](https://nearbypermits.com/marin-county/permit/B48059/) | | May 18, 2026 | [45 Rhinestone Ter](https://nearbypermits.com/marin-county/address/45-rhinestone-ter/) | 430 ft E | Plumbing | Replace Plumbing Fixtures(s); | $2,500 | [B46842](https://nearbypermits.com/marin-county/permit/B46842/) | ### Farther (1,000 ft to ¼ mi), 6 permits | Date | Address | Distance | Type | Work | Cost | Permit | |---|---|---|---|---|---|---| | Sep 23, 2026 | [2661 Las Gallinas Ave](https://nearbypermits.com/marin-county/address/2661-las-gallinas-ave/) | 0.24 mi S | Plumbing | Replace Plumbing Fixtures(s); | $3,200 | [B48461](https://nearbypermits.com/marin-county/permit/B48461/) | | Sep 2, 2026 | [3 Sandstone Ct](https://nearbypermits.com/marin-county/address/3-sandstone-ct/) | 0.23 mi SE | Other | | $188,536 | [182490](https://nearbypermits.com/marin-county/permit/182490/) | | Jul 27, 2026 | [10 Sandstone Ct](https://nearbypermits.com/marin-county/address/10-sandstone-ct/) | 0.21 mi SE | Electrical | Service Upgrade; | $4,500 | [B47634](https://nearbypermits.com/marin-county/permit/B47634/) | | Jul 6, 2026 | [48 Millstone Ter](https://nearbypermits.com/marin-county/address/48-millstone-ter/) | 0.25 mi E | Mechanical (HVAC) | Replace Mechanical Appliance; | $20,000 | [B47394](https://nearbypermits.com/marin-county/permit/B47394/) | | Jun 17, 2026 | [9 Valleystone Dr](https://nearbypermits.com/marin-county/address/9-valleystone-dr/) | 0.20 mi SW | Plumbing | Replace Plumbing Fixtures(s); | $17,000 | [B47202](https://nearbypermits.com/marin-county/permit/B47202/) | | Jun 10, 2026 | [2826 Las Gallinas Ave](https://nearbypermits.com/marin-county/address/2826-las-gallinas-ave/) | 0.19 mi E | Other | | $60,000 | [B47098](https://nearbypermits.com/marin-county/permit/B47098/) | ## Zoning requests nearby We don't list zoning cases for Marin County yet. Look them up on the county's Planning Commission page: https://www.marincounty.gov/departments/cda/planning/boards-commissions-and-public-hearings/about-planning-commission ## More on this street Other addresses on Unionstone Ln with permits, nearest house number first: - [5 Unionstone Ln](https://nearbypermits.com/marin-county/address/5-unionstone-ln/): newest permit Sep 28, 2026 --- Source: Marin County Community Development Agency permit data (https://data.marincounty.gov/d/mkbn-caye), County of Marin, CA, ODbL 1.0 (https://opendatacommons.org/licenses/odbl/1-0/). Checked 2026-10-12 07:47 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/ Contains information from Building Permit (County of Marin, CA), which is made available here under the Open Database License (ODbL). Database: https://data.marincounty.gov/d/mkbn-caye License: https://opendatacommons.org/licenses/odbl/1-0/ Map, all 5 permits at this address and 10 nearby: https://nearbypermits.com/marin-county/address/3-unionstone-ln/