What was permitted
A substantial renovation project is underway for a single-family dwelling in the Castro/Upper Market neighborhood at 3921 18th St. The first floor will be converted from storage into habitable space, including two bedrooms, two bathrooms, and a laundry area.
The project also involves installing a tankless water heater and furnace in the garage, enlarging the garage door, and reconfiguring the second-floor interior layout, including removing an attic at the rear. This extensive alteration permit was issued on July 30, 2026, with a significant estimated project cost of $566,863, handled by Bc United Construction Inc.
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View the official permit record
Tracking number, work description, cost and dates
View the official permit record
Tracking number, work description, cost and dates
| Tracking number | 202505065904 |
|---|---|
| Work permit # | — |
| Job filing number | — |
| Work type | Additions & Alterations · 1 Family Dwelling |
| Status | issued |
| Job description | 1st fl convert storage into habitable space to include 2 bedroom, 2 bath and laundry. install a tankless water and furnace in garage. enlarge garage door. 2nd fl: reconfigure interior layout. remove attic at rear. |
| Floor / unit | — |
| Estimated cost | $566,863 |
| Approved | July 30, 2026 |
| Issued | July 30, 2026 |
| Expires | — |
| BBL | — |
| BIN | — |
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