| Hartsten Construction | Andrew Robert Hartsten | — | (805) 806 0726 | GC, remodel, ADU | Pismo Beach · San Luis Obispo County | — | — |
| Hartzell Backhoe & Construction | Robert Charles Hartzell | — | (805) 995 1991 | GC, remodel, ADU | Cayucos · San Luis Obispo County | — | — |
| Hartzell General Engineering Contractor INC | Charles Randal Hartzell | — | (805) 610 8113 | Other | Cayucos · San Luis Obispo County | — | — |
| Hartzell Horizontal Drilling INC | Lori Ann Caligari-Hartzell | — | (805) 674 7427 | Other | Creston · San Luis Obispo County | — | — |
| Haven Property Management | Haven Property Management | rentals@havenpropmgmt.com | (805) 878-6206 | Property managers | San Luis Obispo · San Luis Obispo County | — | — |
| Hawthorne Builds | Hawthorne Builds | impallari@gmail.com | (503) 413 0932 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Hayes & Sons Paving | Gary Edward Hayes | — | (805) 440 4267 | Other | Nipomo · San Luis Obispo County | — | — |
| Hays Electric Co | Patrick Steven Hays | — | (805) 748 6965 | Electricians | Arroyo Grande · San Luis Obispo County | — | — |
| Hayward Construction | Linda Anne Hayward | — | (805) 440 7914 | Other | San Luis Obispo · San Luis Obispo County | — | — |
| Hd General Engineering INC | Taylor James Hamil | — | (805) 459 4870 | Other | San Luis Obispo · San Luis Obispo County | — | — |
| Heacock Elevator Company | David Robert Heacock | — | (805) 215 3722 | Other | Grover Beach · San Luis Obispo County | — | — |
| Heart Hand Landscape | Heart Hand Landscape | — | (805) 471 1608 | Windows, patio, painters | Los Osos · San Luis Obispo County | — | — |
| Heating & Cooling | Christopher Morgan Thieme | — | (805) 772 4433 | HVAC | Morro Bay · San Luis Obispo County | — | — |
| Heinen Construction | Andrew Dale Heinen | mmheinen@yahoo.com | (805) 440 9620 | Other | Templeton · San Luis Obispo County | — | — |
| Helms Pool & Spa | Helms Pool & Spa | — | (949) 923 0050 | Pool | Cambria · San Luis Obispo County | — | — |
| Henninger Painting | Henninger Painting | — | (805) 550 3325 | Windows, patio, painters | San Luis Obispo · San Luis Obispo County | — | — |
| Henry's Fast N Easy Painting | Henry's Fast N Easy Painting | — | (805) 720 2841 | Windows, patio, painters | Nipomo · San Luis Obispo County | — | — |
| Herbert Hans Salamanca | Herbert Hans Salamanca | — | (805) 704 4185 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| Heritage Bay Plumbing INC | Jared Dirk Murray | — | (805) 674 0272 | Other | Paso Robles · San Luis Obispo County | — | — |
| Heritage Oaks Painting | Heritage Oaks Painting | — | (805) 698 2257 | Windows, patio, painters | Paso Robles · San Luis Obispo County | — | — |
| Heritage Tree Arboricultural Consulting | Heritage Tree Arboricultural Consulting | — | (805) 234-8760 | Tree | San Luis Obispo · San Luis Obispo County | — | — |
| Hernandez Building Co LLC | Miguel Hernandez | — | (805) 369 9809 | GC, remodel, ADU | San Miguel · San Luis Obispo County | — | — |
| Hernandez Electrical Services | Hernandez Marcos | — | (805) 434 8791 | Electricians | Paso Robles · San Luis Obispo County | — | — |
| Hernandez Landscape | Hernandez Landscape | — | (805) 310 0141 | Windows, patio, painters | Nipomo · San Luis Obispo County | — | — |
| Hernandez Roofing | Flavio Cesa Hernandez Aguilar | — | (805) 952 2548 | Other roofers | Atascadero · San Luis Obispo County | — | — |
| Hi-tech Unlimited | Hi-tech Unlimited | — | (559) 230 9839 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| High Caliber Electric | John Edward Rendon | — | (805) 591 0996 | Electricians | Paso Robles · San Luis Obispo County | — | — |
| High End Construction INC | Francisco Nicolas Mantaras | info@highendconstruction.com | (310) 956 0043 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| High Tide Electric | Michael Jared Donnelly | — | (805) 305 1477 | Electricians | San Luis Obispo · San Luis Obispo County | — | — |
| High Voltage Energy INC | Jeremy Jason Santoro | — | (805) 423 3100 | Other | Paso Robles · San Luis Obispo County | — | — |
| Hillside Construction | Mathew Grant Ojeda | — | (805) 709 1566 | GC, remodel, ADU | Pismo Beach · San Luis Obispo County | — | — |
| Hindley Electric | Nichalus Vincent Hindley | — | (719) 357 2441 | Electricians | Paso Robles · San Luis Obispo County | — | — |
| Hively Flooring | Hively Flooring | — | (805) 710 2168 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| Hodges Construction | Justin Allen Hodges | — | (805) 602 1349 | GC, remodel, ADU | Avila Beach · San Luis Obispo County | — | — |
| Hoffert Construction | Jeffrey Jacob Hoffert | — | (805) 712 0678 | GC, remodel, ADU | San Miguel · San Luis Obispo County | — | — |
| Hoffmann Family Plumbing | Hoffmann Family Plumbing | — | (805) 748 4324 | Other | San Luis Obispo · San Luis Obispo County | — | — |
| Hogaboom Construction | Scott Morris Hogaboom | — | (805) 801 5237 | GC, remodel, ADU | Cayucos · San Luis Obispo County | — | — |
| Hogue Construction | Clayton James Hogue | — | (805) 825 1119 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| Hoho Built | Hoho Built | — | (805) 264 7477 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Holden's Drywall | Holden's Drywall | — | (805) 528 7947 | Other | Los Osos · San Luis Obispo County | — | — |