Tri Line Construction Co
General contractor · San Francisco permit activity
General contractor active in San Francisco construction, tracked from public building-permit filings.
#376
by NYC filing activity
among NYC general contractors, last 90 days
6
project records
May 2025 to Jul 2026
2/16
active weeks
weeks with a filing (last 16)
6 projects
Scopes, declared values and this firm's role on each one
See 6 projects involving Tri Line Construction
Recent projects involving this firm
West of Twin Peaks
1)full bathroom remodel, remove entire bathroom and install shower, vanity, toilet and tiles.…
$30K
West of Twin Peaks
Install 1/2" cot plywood on existing roof for roofing by other. 2100 sqft of plywood. not…
$4K
Sunset/Parkside
Exploratory demo - remove gypsum board at walls and ceiling of ground floor (300 sq ft total)…
$2K
Neighbourhood, filing date, scope and declared value are shown here. Exact addresses, full filing histories and project teams are part of the paid product.
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6 project records for Tri Line Construction: addresses, values, project teams
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Middle 50% of declared values: $4K–$50K (median $40K)
Most recent filing: West of Twin Peaks · Jul 29, 2026
3 active · 3 newly observed last 90 days
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Filing activity · last 16 weeks
APR
MAY
JUN
JUL
3
active projects (last 90d)
3
newly observed (last 90d)
Jul 2026
peak month
Project mix · by use
Residential100%
Geography · by borough
Excelsior33%
West of Twin Peaks33%
Inner Sunset17%
Sunset/Parkside17%
Shared-project connections
| # | Firm | Primary role | Shared | Relative |
|---|---|---|---|---|
| 1 | William Liang | Engineering | 1 | |
| None on shared filings. | ||||
Firms that appear on the same San Francisco permit filings. Association on shared filings, not a proven working relationship.
Frequently asked questions
How many SF projects has Tri Line Construction Co filed?▾
PermitPipeline tracks 6 San Francisco building-permit projects for Tri Line Construction Co (May 2025 to Jul 2026). 3 had filing activity in the last 90 days.
Does Tri Line Construction Co work on commercial or residential projects?▾
Across its tracked San Francisco filings, 0% of Tri Line Construction Co'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 Tri Line Construction Co work?▾
33% of Tri Line Construction Co's tracked San Francisco projects are in Excelsior.
What is a typical Tri Line Construction Co project worth?▾
Across the 7 tracked projects with a declared value, Tri Line Construction Co averages $39K per project (declared value on the permit filing, not contract value).
Which firms does Tri Line Construction Co work with most often?▾
Tri Line Construction Co most frequently appears on the same San Francisco permit filings as William Liang. Appearing together indicates association on shared filings, not a proven working relationship.
Is Tri Line Construction Co a general contractor?▾
Tri Line Construction Co is listed as a general contractor on its San Francisco permit filings. Roles on this profile are derived from the role each firm holds on public DOB filings.
Public aggregate — full project records are part of the paid leads product. Updated daily from SF DBI filings.
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