City of Diamond Bar
121 public works projects registered with the California Department of Industrial Relations, 2011–2026 · Diamond Bar, Los Angeles County. Reported contract value: $16,524,843.
Projects by year
| Year | Projects | Reported contract value |
|---|---|---|
| 2026 | 3 | $111,849 |
| 2025 | 13 | $13,612,912 |
| 2024 | 22 | $2,437,782 |
| 2023 | 19 | $362,300 |
| 2022 | 11 | — |
| 2021 | 8 | — |
| 2020 | 6 | — |
| 2019 | 8 | — |
| 2018 | 8 | — |
| 2017 | 8 | — |
| 2016 | 6 | — |
| 2015 | 3 | — |
| 2011 | 1 | — |
DIR has published contract amounts since July 2024; earlier years count projects only.
Types of work
- Paving & streets · 34
- Parks, landscape & fields · 22
- Traffic & signals · 15
- Electrical, low voltage & AV · 9
- Other · 9
- Storm drain & flood control · 8
- Roofing · 7
- HVAC & mechanical · 5
- Painting & flooring · 3
- Solar, EV & energy · 2
- Buildings & facilities · 2
- Fire & life safety · 2
Inferred by Atriam from each project's name and description, not reported by the agency.
Contractors it awards most
| Prime contractor | Projects | Reported contract value |
|---|---|---|
| GENTRY BROTHERS INC | 2 | $11,380,528 |
| NOVA LANDSCAPE GROUP INC | 2 | $1,473,385 |
| T V R CONSTRUCTION ENGINEERING LLC | 2 | $161,419 |
| WEATHERPROOFING TECHNOLOGIES INC | 2 | $72,795 |
| VACT, INC. | 2 | $17,316 |
| TAIT & ASSOCIATES INC | 1 | $362,300 |
| P T M GENERAL ENGINEERING SERVICES INC | 1 | $251,355 |
| C BELOW, INC. | 1 | $122,568 |
| PYRO - COMM SYSTEMS INC | 1 | $119,500 |
| Yunex LLC | 1 | $52,035 |
| Facility Solutions Group, Inc | 1 | $50,029 |
| CROSSTOWN ELECTRICAL & DATA INC | 1 | $48,490 |
| D S CASTRO INC DBA HORIZON CONSTRUCTION COMPANY | 1 | $39,245 |
| TRANE U S INC | 1 | $34,565 |
| SITEONE LANDSCAPE SUPPLY LLC | 1 | $16,966 |
Latest projects
| Date | Project | Prime contractor | Contract amount |
|---|---|---|---|
| Jun 29, 2026 | CDBG Area 5 CIP No. SI264Paving & streets | T V R CONSTRUCTION ENGINEERING LLC | $84,343 |
| Jun 25, 2026 | Pantera Park Irrigation Controller InstaParks, landscape & fields | SITEONE LANDSCAPE SUPPLY LLC | $16,966 |
| Apr 20, 2026 | DBC access control upgradesElectrical, low voltage & AV | VACT, INC. | $10,540 |
| Dec 16, 2025 | VRF Upgrade to the HVAC System at DBHVAC & mechanical | TRANE U S INC | $34,565 |
| Dec 12, 2025 | Sunset Crossing Road Park (Pony Fields)Paving & streets | WEATHERPROOFING TECHNOLOGIES INC | $28,795 |
| Nov 4, 2025 | DB Blvd. Complete Streets ProjectPaving & streets | GENTRY BROTHERS INC | $8,805,161 |
| Oct 30, 2025 | FY2025/26 BBS and CCTV Replacement Proj.Electrical, low voltage & AV | CROSSTOWN ELECTRICAL & DATA INC | $48,490 |
| Oct 16, 2025 | Installation of alarm system at SycamoreParks, landscape & fields | VACT, INC. | $6,776 |
| Sep 16, 2025 | DBC Interior Lighting ProjectElectrical, low voltage & AV | Facility Solutions Group, Inc | $50,029 |
| Sep 16, 2025 | City Hall Fire Alarm System ReplacementFire & life safety | PYRO - COMM SYSTEMS INC | $119,500 |
| Jul 15, 2025 | Pony Field - Landscape MaintenanceParks, landscape & fields | NOVA LANDSCAPE GROUP INC | $527,985 |
| Jun 17, 2025 | Diamond Bar Blvd Roadway StabilizationPaving & streets | C BELOW, INC. | $122,568 |
| May 20, 2025 | Landscape Maintenance ContractParks, landscape & fields | NOVA LANDSCAPE GROUP INC | $945,400 |
| May 20, 2025 | BCY Storm Drain LiningStorm drain & flood control | Vortex Services, LLC | $271,200 |
| May 6, 2025 | Area 4 Residential and Arterial RehabPaving & streets | GENTRY BROTHERS INC | $2,575,367 |
| Apr 9, 2025 | CDBG Area 5 CIP No. SI254Paving & streets | T V R CONSTRUCTION ENGINEERING LLC | $77,076 |
| Oct 15, 2024 | FY24-25 BBS and CCTV Replacement ProjectElectrical, low voltage & AV | Yunex LLC | $52,035 |
| Sep 26, 2024 | DBC OFFICE IMPROVEMENT PROJECTHVAC & mechanical | D S CASTRO INC DBA HORIZON CONSTRUCTION COMPANY | $39,245 |
| Aug 6, 2024 | Maple Hill Improvement Project (FP23506)Plumbing & restrooms | — | $1,689,766 |
| Jul 25, 2024 | Steep Canyon Road Erosion ControlPaving & streets | SITEREP CONSTRUCTION SERVICES INC DBA SITEREP CONCRETE | $88,026 |
| Jul 16, 2024 | Intersection Safety Improvement ProjectTraffic & signals | — | $251,355 |
| Jul 16, 2024 | Intersection Safety ImprovementsTraffic & signals | P T M GENERAL ENGINEERING SERVICES INC | $251,355 |
| Jul 8, 2024 | Area 4 CDBGPaving & streets | — | — |
| Jul 1, 2024 | Contract Maintenance ServicesParks, landscape & fields | — | $22,000 |
| Jun 18, 2024 | Maintenance Services Contract FY24-26Roofing | WEATHERPROOFING TECHNOLOGIES INC | $44,000 |
Source: California Department of Industrial Relations public works project registrations (PWC-100), updated daily by Atriam.