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
- 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
Time to get a permit
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
Most recent
- 3577 17th StKitchen 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 fixtureOct 28, 2026Filed
- 1190 Pine St #0Enlarge (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.Jul 28, 2026Filed
- 227 Athens StInterior, structural renovation to result in a sfr with 3.5 baths. no increase to area. (n) location of interior stair, insulation, windows.Nov 5, 2025Complete
- 465 Parker AvInterior renovation of the upper unit. no work at basement (lower unit). kitchen & two bathrm renovation. (e) deck to be modified. convert (e) powder rm to full bath at g/f. new insulation. replace (1) furnace to electric heat pump system. no change of use, area of conditioned space & height.Oct 13, 2023Complete
- 2538 Lake StInt renovation to reconfigure layout of 2 dwelling unit of an (e) 3 story house. no change of use. new roof deck at (e) roof. new fire sprinkler sys throughout entire bldg. (e) unpermitted rear decks to be removed.Aug 7, 2023Issued
| Filed | Project | Type | Status | Time to permit | Open |
|---|---|---|---|---|---|
| Oct 28, 2026 | 3577 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 | Home remodel | Filed | — | |
| Sep 3, 2026 | 534 Laidley St Add 1 new state adu. verticle and horizontal addition. ab-112 Filed | AdditionType unconfirmed | Filed | — | |
| Aug 31, 2026 | 1737 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 | Other | Filed | — | |
| Aug 31, 2026 | 1737 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 | Other | Filed | — | |
| Jul 28, 2026 | 1190 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 | Home remodel | Filed | — | |
| Jun 18, 2026 | 257 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 | Revision or supplement | Triage | — | |
| Mar 21, 2026 | 2420 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 | ADU | Filed | — | |
| Mar 6, 2026 | 1236 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 | Deck, stairs or patio cover | Issued | 6 months | |
| Nov 5, 2025 | 227 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 | Home remodel | Complete | 4 months | |
| Oct 30, 2025 | 347 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 | Legalize or fix a violation | Issued | 4 months | |
| Oct 6, 2025 | 4733 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 | Addition | Complete | Within 1 month | |
| Sep 29, 2025 | 436 Persia Av Existing deck and staircase to rear yard to be replaced. no change at the front, existing dwelling unit and interiors. Complete | Deck, stairs or patio cover | Complete | 3 months | |
| Sep 22, 2025 | 3318 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 | OtherType unconfirmed | Filed | — | |
| Aug 26, 2025 | 130 Berkeley Wy 1) replace an existing retaining wall in rear yard. 2) no change to existing building Complete | Retaining wall or site work | Complete | Within 1 month | |
| Aug 14, 2025 | 323 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 | Legalize or fix a violation | Issued | 5 months | |
| Jul 18, 2025 | 3074 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 | Addition | Complete | Within 1 month | |
| Apr 19, 2025 | 774 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 | Legalize or fix a violation | Issued | 12 months | |
| Aug 9, 2024 | 1975 29th Av 10'-0 height deck extension with total area 202 sf. replace one existing window to sliding door. Complete | Deck, stairs or patio cover | Complete | Within 1 month | |
| Mar 21, 2024 | 360 Laidley St Revision to pa# 201905281761 2nd fl kitchen to have new floor joists and sub floor to be replaced. Complete | Revision or supplement | Complete | 1 month | |
| Dec 26, 2023 | 306 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 | AdditionType unconfirmed | 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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