Triangle Engineering is an engineering firm with 3 tracked San Francisco building-permit projects on record, with the latest filing in that record 323 days ago. Its filings (Feb 2025 to Nov 2025) are concentrated in Bernal Heights and Chinatown, 67% residential. If you work at Triangle Engineering, claim this page to add a description.
Filed 323 days ago
#989
by SF filing activity
among SF architects & engineers, 90 days to Oct 4, 2026
3
projects
from 3 filings
0/16
active weeks
weeks with a filing (16 weeks to Oct 4, 2026)
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Permit-backed projects · PermitPipeline’s independent record
$9.3M Hayes Valley multifamily HVAC upgrade
Active 10 months ago · Triangle Engineering: engineer
Rehabilitation of 21 (e) units & provide 2 new dwelling units including new bathrooms & kitchens.provide new accessible entry and lobby…
No GC named · Architect identified
View project details →
$25K Chinatown commercial renovation
Last active Feb 2025 · Triangle Engineering: engineer
Revision to to add wall ties to remaining half of 2nd fl. structural revision only
GC named · Specialty contractor identified
View project details →
$65K Bernal Heights single-family renovation
Last active Feb 2025 · Triangle Engineering: engineer
Voluntary basement seismic retrofit at front building per cebc appendix ch a4
No GC named
View project details →
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.
3 project records for Triangle Engineering: addresses, values, project teams
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Declared values3 on filetoo few for a rangeLast filed323 days agoHayes Valley · Nov 18, 2025Last 90 days0 active0 newly filed
Filing activity · 16 weeks to Oct 4, 2026
JUN
JUL
AUG
SEP
Project mix · by use
Commercial33%
Residential67%
Geography · by neighborhood
Bernal Heights34%
Chinatown33%
Hayes Valley33%
Shared-project connections
| # | Firm | Primary role | Shared | Relative |
|---|---|---|---|---|
| 1 | Gelfand Partners Architects | Architecture | 1 | |
| 1 | Amone Corp | 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 relationships0 firmsFirms this one appears with on more than one project, out of 2 in total.
Permit speed—Too few filings with a recorded issue date to publish a median.
Frequently asked questions
How many SF projects does Triangle Engineering appear on?▾
PermitPipeline tracks 3 San Francisco building-permit projects for Triangle Engineering (Feb 2025 to Nov 2025). 0 had filing activity in the last 90 days.
Does Triangle Engineering work on commercial or residential projects?▾
Across its tracked San Francisco filings, 33% of Triangle Engineering's projects are commercial and 67% are residential (multifamily, small residential, or single-family). Based on permit records, not self-reported.
Where in San Francisco does Triangle Engineering work?▾
34% of Triangle Engineering's tracked San Francisco projects are in Bernal Heights.
Which firms appear most often on the same filings as Triangle Engineering?▾
Triangle Engineering most frequently appears on the same San Francisco permit filings as Amone Corp, Gelfand Partners Architects. Appearing together indicates association on shared filings, not a proven working relationship.
Is Triangle Engineering an engineering firm?▾
Triangle Engineering 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 Oct 4, 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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