| Garys Electric | Gary Joseph Walecke | — | (760) 648 3474 | Electricians | Lee Vining · Mono County | — | — |
| Gc Cal Construction INC | Jerry Alan Verdier | — | (760) 709 0370 | GC, remodel, ADU | Mammoth Lakes · Mono County | — | — |
| General Supply Co | General Supply Co | — | (925) 960-8790 | Electricians | Sonora · Mono County | — | — |
| Gordon Gluck | Gordon Gluck | — | (760) 914 1446 | Other | Mammoth Lakes · Mono County | — | — |
| Hammack Construction | Jedidiah Hawkstar Juniper | — | (707) 590 2997 | GC, remodel, ADU | Bridgeport · Mono County | — | — |
| Hammer Time Construction | Jose Miguel Hernadez Garcia | — | (760) 914 3701 | GC, remodel, ADU | Mammoth Lakes · Mono County | — | — |
| Hard Core Concrete INC | Dylan Henry Howell | — | (760) 920 8837 | GC, remodel, ADU | Crowley Lake · Mono County | — | — |
| Harrington Decorative Finishes | Harrington Decorative Finishes | — | (760) 333 1211 | Windows, patio, painters | Mammoth Lakes · Mono County | — | — |
| Harris Floor Covering Co | Gregory Joseph Harris | — | (760) 965 6869 | Other | Crowley Lake · Mono County | — | — |
| Higerd Plumbing | Higerd Plumbing | — | (760) 934 7567 | Other | Mammoth Lakes · Mono County | — | — |
| High Altitude Electric | Gregory Alan Rathbun | — | (760) 206 3044 | Electricians | Mammoth Lakes · Mono County | — | — |
| High Country Contractors | Shawn Vincent Wallentine | — | (760) 709 2069 | GC, remodel, ADU | June Lake · Mono County | — | — |
| Highland Plumbing INC | Tarek Robert Nuttall | service@highland-plumbing.com | (760) 914 9184 | Other | Mammoth Lakes · Mono County | — | — |
| Highpower Construction | Mike Arnold Byars | chuckhpc@gmail.com | (818) 447-4665 | GC, remodel, ADU | Mammoth Lakes · Mono County | — | — |
| Hilton Creek Heating & Cooling INC | John David Preston | — | (760) 914 7116 | HVAC | Crowley Lake · Mono County | — | — |
| Holt Plumbing Service | Darrell Evan Holt | — | (760) 914 1064 | Other | Mammoth Lakes · Mono County | — | — |
| Honest Electric | Honest Electric | — | (858) 466-3781 | Electricians | Oceanside · Mono County | — | — |
| Hronesh Hardwood Floors INC | Ryan Kenneth Nicklas | — | (760) 924 8880 | Other | Mammoth Lakes · Mono County | — | — |
| Huntsman Plumbing | Huntsman Plumbing | bhuntsman@huntsmanplumbing.com | (760) 914 2273 | Other | Lee Vining · Mono County | — | — |
| Imagine Landscaping | Imagine Landscaping | — | (760) 914 1543 | Windows, patio, painters | Benton · Mono County | — | — |
| J B Electric | Jeffrey Edward Houghtaling | — | (760) 914 1653 | Electricians | Mammoth Lakes · Mono County | — | — |
| J Carlson Construction | Carlson J Cpnstruction | — | (760) 937 7044 | GC, remodel, ADU | Mammoth Lakes · Mono County | — | — |
| J P Kramer Quality Construction | Jeffrey Peter Kramer | — | (760) 914 2330 | GC, remodel, ADU | June Lake · Mono County | — | — |
| J T Hatter Electric | Jason Thomas Hatter | — | (760) 873 5200 | Electricians | Mammoth Lakes · Mono County | — | — |
| J W H Homes INC | John Wayne Hooper | — | (760) 934 8844 | GC, remodel, ADU | Mammoth Lakes · Mono County | — | — |
| James Harper | James Harper | — | (760) 937 0307 | Electricians | Mammoth Lakes · Mono County | — | — |
| Jay Bretton | Jay Bretton | — | (760) 238 0080 | GC, remodel, ADU | Mammoth Lakes · Mono County | — | — |
| Jdb Construction INC | Jordan Dana Burroughs | — | (760) 709 0123 | GC, remodel, ADU | Mammoth Lakes · Mono County | — | — |
| Jennison Construction INC | Gregory Francis Jennison | — | (760) 935 4343 | GC, remodel, ADU | Mammoth Lakes · Mono County | — | — |
| Jerry A Verdier Construction | Jerry Alan Verdier | — | (760) 937 5810 | GC, remodel, ADU | Mammoth Lakes · Mono County | — | — |
| Jim Kelly Painting | Jim Kelly Painting | — | (760) 914 1386 | Windows, patio, painters | Mammoth Lakes · Mono County | — | — |
| Joe Suppa Electrical | Joseph Paul Suppa | — | (760) 914 1765 | Electricians | Lee Vining · Mono County | — | — |
| Jordan Construction INC | Bryce Cole Jordan | — | (760) 965 0015 | GC, remodel, ADU | Mammoth Lakes · Mono County | — | — |
| Jordyn Murphy Electric | Jordyn Tyler Murphy | — | (760) 709 1676 | Electricians | Mammoth Lakes · Mono County | — | — |
| June Lake Painting & Decorating | June Lake Painting & Decorating | — | (760) 648 7294 | Windows, patio, painters | June Lake · Mono County | — | — |
| Justin Long Construction | Justin M Long | — | (760) 648 3925 | GC, remodel, ADU | Lee Vining · Mono County | — | — |
| K2 Plumbing | K2 Plumbing | — | (630) 857 6255 | Other | Mammoth Lakes · Mono County | — | — |
| Karl A Seiberling Construction | Karl A Seiberling | — | (760) 914 3611 | GC, remodel, ADU | Lee Vining · Mono County | — | — |
| Kelley Construction | Jeffrey Alan Kelley | — | (760) 937 2745 | GC, remodel, ADU | Mammoth Lakes · Mono County | — | — |
| Kn Sandvigen Construction | Kenyon Neil Sandvigen | — | (949) 466 2184 | GC, remodel, ADU | Mammoth Lakes · Mono County | — | — |