CheckMyDesigner

Lou Xiao

Engineer · Lx Engineering · San Bruno

Public records

From the licensing board and the city of San Francisco.

The short answer

Licensed?
License activeStructural Engineer S-5130First issued Jan 25, 2008, expires Dec 31, 2026.

Source: DCA license roster, retrieved Nov 5, 2026

Verify on DCA License Search

Any board discipline?
None found.

We searched the BPELSG enforcement list on Nov 5, 2026.

Worked in San Francisco?
61 permits since 2009, 61 in the last 5 years. Latest filed Oct 28, 2026.
What kind of projects?
Home remodel 21 · Addition 12 · Seismic retrofit or foundation 8
How long do their permits take?
Home remodel: 4 months. City typical for the same review: 9 months.

Permits filed each year

San Francisco permits by the year they were filed. The last 5 years are in blue.

What are you planning?

Pick your kind of project to see their permits for it.

Home remodel: 21 permits in San Francisco

From 2012 to 2026, latest filed Oct 28, 2026.

Time to get a permit

Theirs
4 months
City
9 months

Median from filing to permit, from 17 issued permits filed since 1966; 4 still in review. City is the San Francisco median for the same kind of review, from 12,138 permits.

Where

  • Sunset/Parkside5
  • Mission2
  • Outer Richmond2
  • West of Twin Peaks2
Permits
72 permits that name Lou Xiao, newest first, including 11 revisions or supplements that are not counted. Select a permit to see the full record.
FiledProjectOpen
Oct 28, 20263577 17th St

Kitchen remodel of upper unit including removal of (e) interior partitions, (n) engineering beam support roof rafters, replace gas wall heater w/central furnance incl dropped ceiling to route ducting, replace water heater w/gas hwh. upgrade (e) sub panel, new skylights, replace (e) plumbing fixture

Filed
Sep 3, 2026534 Laidley St

Add 1 new state adu. verticle and horizontal addition. ab-112

Filed
Aug 31, 20261737 Post St

Ste 330- adding an electrical heat pump split unit (for cooling) to (e) ciling of suite 330- a retail store. exterior condenser unit to be installed on (e) roof. electric conduit to be subpanel at elevator area. no change to (e), structure, area, heating and ventilation, fire sprinkler and lighting.

Filed
Aug 31, 20261737 Post St

Ste 385- adding an electrical heat pump split unit (for cooling) to (e) ciling of suite 385- a retail store. exterior condenser unit to be installed on (e) roof. electric conduit to be subpanel at elevator area. no change to (e), structure, area, heating and ventilation, fire sprinkler and lighting.

Filed
Jul 28, 20261190 Pine St #0

Enlarge (e) room with room with (n) electrical equipment per utility company's requierement. relocate (e) laundry room. no change of use, height, egress path, exits, exterior, gross area.

Filed
Jun 18, 2026257 Justin Dr

Revision 202211287192- to comply with nov 202298533 to include remodel ktichen and bath on upper level, remove structrual wall on upper level, modify closets to both bedrooms on upper level, add master suite on lower level, add laundry room, wet bar, half bath on lower level. to close pa

Triage
Mar 21, 20262420 Folsom St

Interior renovation to add 3 new adu units per state program to replace garage at ground floor. new bicycle parking, new gas and electrical room, new street tree, no change to existing use and height.

Filed
Mar 6, 20261236 Kirkham St

All three existing-non-conforming staircases at rear yard to be replaced in kind. exterior work only. no change to the front and sides, use, occupancy, interiors, mechanical, and plumbinq. new exterior led flood liqht fixtures

Issued
Nov 5, 2025227 Athens St

Interior, structural renovation to result in a sfr with 3.5 baths. no increase to area. (n) location of interior stair, insulation, windows.

Complete
Oct 30, 2025347 Haight St #0

To comply with nov# 202539125, fire repair of exterior rear landing at stairs. repair dry rot as needed. remove rear exterior door & window. repair framing & siding as required. all repairs & replacements to be like for like & in-kind.

Issued
Oct 6, 20254733 18th St

Construct a 5'x0" x 12'-0" horizontal addition @ south corner of primary bedroom to create a small nursery including exterior walls and a window. no changes to building in height, number of stories or occupancy. addition not visible from street

Complete
Sep 29, 2025436 Persia Av

Existing deck and staircase to rear yard to be replaced. no change at the front, existing dwelling unit and interiors.

Complete
Sep 22, 20253318 Fillmore St

Two new retractable roofs at an existing 2-story building. rooftop hvac unit relocate and duct system extension for (e) restaurant space. no change of use, occupant load, height, and area.

Filed
Aug 26, 2025130 Berkeley Wy

1) replace an existing retaining wall in rear yard. 2) no change to existing building

Complete
Aug 14, 2025323 Byxbee St

Comply w/ nov #202431941 & nov #202534571: new adu unit "studio" at g/f per state adu program. removal of unpermitted exterior staircase enclosure at rear. removal of unpermitted deck at 2/f.

Issued
Jul 18, 20253074 Pacific Av

Remodel (e) kitchen and 1-story expansion into (e) courtyard of (e) 2-story single family dwelling. new fixtures and finishes throughout kitchen. work not visible from public right of way

Complete
Apr 19, 2025774 Tehama St

Demo and reconstruction of second story and restrooms in response to the following notice of violations:nov#'s: 202425066, 202425811, and 202425824.scope of work is interior only.

Issued
Aug 9, 20241975 29th Av

10'-0 height deck extension with total area 202 sf. replace one existing window to sliding door.

Complete
Mar 21, 2024360 Laidley St

Revision to pa# 201905281761 2nd fl kitchen to have new floor joists and sub floor to be replaced.

Complete
Dec 26, 2023306 Ortega St

Interior renovation to an existing 2-story single-family dwelling. infill existing lightwell with new interior staircase. new master suite behind garage. no change to existing use and height.

Filed

Sources: DataSF i98e-djp9, 3pee-9qhc, retrieved Nov 5, 2026. Names on permits are matched to licenses by license number and name; unmatched records are not shown.

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