ABUNDANT SOLAR ABUNDANT SOLAR LLC | CLR2 | Electrical | — |
| ALBINS PLUMBING INC | 2-15PB | Plumbing | — |
| ALL IN ONE ELECTRIC LLC | C928 | Electrical | — |
ARMOR CONTRACTING LLC AMNOS RESIDENTIAL MAINTENANCE ODD JOBS & REPAIR LLC | PB1621 | Plumbing | — |
| BARLOW ELECTRIC INCORPORATED | C926 | Electrical | — |
BENHAM ELECTRICAL SERVICE & TELECOM DE BENHAM INC | C143 | Electrical | — |
| BOB GRANT CONSTRUCTION INC | PB1958 | Plumbing | — |
| BUILDING ENERGY LLC COM | LHR691 | Electrical | — |
| BUTTS ELECTRIC INC | 2-19C | Electrical | — |
CAMPBELL CONCRETE NORTHWEST CAMPBELL CONSTRUCTION NW LLC | PB2038 | Plumbing | — |
| CLAIR COMPANY | 014SRB | Certification | — |
CORVALLIS HEATING & MECHANICAL;ENERGY EXPERTS;LORENS ENERGY EXPERTS;LORENS HEATING & AIR;PACE ENERGY EXPERTS;PACE HEATING & AIR;SCOTTS JENS LLC | PBH8 | Combo License | — |
CORVALLIS HEATING & MECHANICAL;ENERGY EXPERTS;LORENS ENERGY EXPERTS;LORENS HEATING & AIR;PACE ENERGY EXPERTS;PACE HEATING & AIR;SCOTTS JENS LLC | CRE101 | Electrical | — |
| CORVALLIS PLUMBING INC | PB845 | Plumbing | — |
| FREESTONE PLUMBING LLC | PB3503 | Plumbing | — |
| HAMMERQUIST INC | B99-2128 | Boiler | — |
| HAMMERQUIST INC | 2-24PB | Plumbing | — |
| J & D PLUMBING LLC | LMS649 | Electrical | — |
| J & D PLUMBING LLC | PB3471 | Plumbing | — |
| JIM SHAW INC | PB2033 | Plumbing | — |
JUNCTION CITY ELECTRIC; JUNCTION CITY ELECTRIC & PLUMBING RG SMITH ELECTRICAL CONTRACTING INC | 2-40C | Electrical | — |
JUNCTION CITY ELECTRIC; JUNCTION CITY ELECTRIC & PLUMBING RG SMITH ELECTRICAL CONTRACTING INC | LMS520 | Electrical | — |
JUNCTION CITY ELECTRIC; JUNCTION CITY ELECTRIC & PLUMBING RG SMITH ELECTRICAL CONTRACTING INC | 3-285PB | Plumbing | — |
| MIDDLETON HEATING & SHEET METAL INC | 60LHR | Electrical | — |
| MIDDLETON HEATING & SHEET METAL INC | 2-30PB | Plumbing | — |
NORTHWEST COMPRESSOR COMPRESSOR SYSTEMS INC | B99-2273 | Boiler | — |
| OWEN RYAN CONSTRUCTION LLC | C1488 | Electrical | — |
| OWEN RYAN CONSTRUCTION LLC | PB2251 | Plumbing | — |
PEAK DUCTLESS HEATING AND COOLING, PEAK HEAT PUMPS & ELECTRIC PEAK ELECTRICAL SERVICES LLC | C1641 | Electrical | — |
PEAK DUCTLESS HEATING AND COOLING, PEAK HEAT PUMPS & ELECTRIC PEAK ELECTRICAL SERVICES LLC | LHR632 | Electrical | — |
PEAK DUCTLESS HEATING AND COOLING, PEAK HEAT PUMPS & ELECTRIC PEAK ELECTRICAL SERVICES LLC | PB3245 | Plumbing | — |
| PORTER REMODELING INC | PB1812 | Plumbing | — |
| PREMIER ELECTRICAL INC | 2-84C | Electrical | — |
| RED HAT CONSTRUCTION INC | BP35 | Combo License | — |
| REMODELING SERVICES LLC | LMS664 | Electrical | — |
| REMODELING SERVICES LLC | PB3540 | Plumbing | — |
| RICE HEATING & AIR CONDITIONING INC | 2-66CRE | Electrical | — |
| RICE HEATING & AIR CONDITIONING INC | 786LHR | Electrical | — |
| RICE HEATING & AIR CONDITIONING INC | 2-46PB | Plumbing | — |
SERVPRO OF BENTON COUNTY MCGINNIS ENTERPRISES INC | PM83 | Combo License | — |
| STEPHENS HEATING & AIR CONDITIONING INC | 2-69CRE | Electrical | — |
| STEPHENS HEATING & AIR CONDITIONING INC | 299LHR | Electrical | — |
| STEPHENS HEATING & AIR CONDITIONING INC | 190LMS | Electrical | — |
| STEPHENS HEATING & AIR CONDITIONING INC | PB1845 | Plumbing | — |
| SUPERIOR ELECTRIC COMPANY | 2-81C | Electrical | — |
SYNERGY SECURITY SOLUTIONS MISTRY INVESTMENTS LLC | CLE426 | Electrical | — |
| THEVENIN ELECTRIC LLC | C2123 | Electrical | — |
| TOP GRADE PLUMBING LLC | PB3032 | Plumbing | — |
| WATSON MECHANICAL LLC | CRE343 | Electrical | — |
| WATSON MECHANICAL LLC | LHR689 | Electrical | — |
| WATSON MECHANICAL LLC | LMS648 | Electrical | — |
| WATSON MECHANICAL LLC | PB3481 | Plumbing | — |