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William Liang is an engineering firm with 18 tracked San Francisco building-permit projects on record, with the latest filing in that record 63 days ago. Its filings (Feb 2025 to Jul 2026) are concentrated in Excelsior and Sunset/Parkside, 100% residential. A typical project in the record declares $25K–$150K. If you work at William Liang, claim this page to add a description.
Filed 63 days ago
#148
by SF filing activity
among SF architects & engineers, 90 days to Aug 23, 2026
18
projects
from 51 filings
4/16
active weeks
weeks with a filing (16 weeks to Aug 23, 2026)
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Permit-backed projects · PermitPipeline’s independent record
$286K Visitacion Valley single-family renovation
Grade AActive 2 months ago · William Liang: engineer
Panel upgrade to 200amp. install lights & outlets per plan & codes. replace knob & tube - kitchen & bathroom remodel
GC named · Architect identified · Design firm identified · Specialty contractor identified
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$28K Outer Richmond multifamily renovation
Grade DActive 2 months ago · William Liang: engineer
Demolish unpermitted rear deck & stairs and rebuild 3rd floor deck and stairs to rear yard conforming to current code
GC named · Specialty contractor identified
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$279K West of Twin Peaks single-family renovation
Active 7 months ago · 4 filings · William Liang: engineer
Revision to. staircase is originally brick, but want to change material to stone
GC named · Specialty contractor identified
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15 more
William Liang projects with project intelligence
Scopes, values, teams and filing history for every one
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Neighborhood, filing date, scope and declared value are shown here. Exact addresses,
owner names and mailing addresses, and full filing histories are part of the paid product.
18 project records for William Liang: addresses, values, project teams
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Typical project$25K–$150K$66K typical3.9× the SF median ($17K)Last filed63 days agoExcelsior · Jul 15, 2026Last 90 days5 active2 newly filed
Filing activity · 16 weeks to Aug 23, 2026 · peak Jul 2026
MAY
JUN
JUL
AUG
Project mix · by use
Residential100%
Geography · by neighborhood
Excelsior39%
Sunset/Parkside23%
Outer Richmond15%
West of Twin Peaks15%
Inner Richmond8%
Shared-project connections
| # | Firm | Primary role | Shared | Relative |
|---|---|---|---|---|
| 1 | Baukunst | Architecture | 2 | |
| 1 | Y L Construction | General contractor | 3 | |
| 2 | Bingo Builders | General contractor | 2 | |
| 3 | Q & QQ Construction Inc | General contractor | 2 | |
| 4 | B W H Builder Inc. | General contractor | 1 | |
| 5 | JWL 888 Construction Inc | General contractor | 1 |
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Owner and developer names, and the projects behind each connection, are part of the Leads product.
Firms that appear on the same San Francisco permit filings. Association on shared filings, not a proven working relationship.
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State licenseNot connectedArchitects are licensed by the California Architects Board and engineers by BPELSG. Neither register is part of the San Francisco permit record, and we do not yet read them.
Repeat working relationships4 firmsFirms this one appears with on more than one project, out of 10 in total.
Permit speed—Too few filings with a recorded issue date to publish a median.
Frequently asked questions
How many SF projects does William Liang appear on?▾
PermitPipeline tracks 18 San Francisco building-permit projects for William Liang (Feb 2025 to Jul 2026). 5 had filing activity in the last 90 days.
Does William Liang work on commercial or residential projects?▾
Across its tracked San Francisco filings, 0% of William Liang's projects are commercial and 100% are residential (multifamily, small residential, or single-family). Based on permit records, not self-reported.
Where in San Francisco does William Liang work?▾
39% of William Liang's tracked San Francisco projects are in Excelsior.
What is a typical William Liang project worth?▾
The median declared value across the 18 San Francisco projects William Liang has on record that state one is $66K (declared value on the permit filing, not contract value).
Which firms appear most often on the same filings as William Liang?▾
William Liang most frequently appears on the same San Francisco permit filings as Y L Construction, Baukunst, Bingo Builders. Appearing together indicates association on shared filings, not a proven working relationship.
Is William Liang an engineering firm?▾
William Liang is listed as an engineering firm on its San Francisco permit filings. Roles on this profile are derived from the role each firm holds on public SF DBI filings.
Public aggregate — full project records are part of the paid leads product. Ranking, filing activity, project mix and geography were last recomputed Aug 23, 2026. Project counts, declared values and filing dates are read live from SF DBI filings.
How far back does this record go?▾
This page covers the recent permit record, not the firm’s full history. A firm’s earliest filing here means it was already working when our record opens, not that it started then.
Sources
San Francisco Department of Building Inspection permit filings.
Record source
Read directly from SF DBI filings.
Photography
None are shown until the firm supplies them.
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