| D-rock Construction | Derek Thomas Chadwick | — | (707) 759 0761 | GC, remodel, ADU | Middletown · Lake County | — | — |
| Dallas Woll INC DBA Roto Rooter Of Lake County | Victoria Jean Christie | — | (707) 349 4982 | Other | Kelseyville · Lake County | — | — |
| Dan Labelle Electric | Daniel Valerien Labelle | — | (707) 245 5675 | Electricians | Lucerne · Lake County | — | — |
| Daniel Lewis | Daniel Lewis | — | (707) 481 2866 | GC, remodel, ADU | Lower Lake · Lake County | — | — |
| David Deakins Construction | David Allen Deakins | — | (707) 272 5346 | GC, remodel, ADU | Clearlake · Lake County | — | — |
| David Gildea DBA D & D Construction | David Allen Gildea | — | (707) 489 9161 | GC, remodel, ADU | Lakeport · Lake County | — | — |
| David Mudge Gardens | David Mudge Gardens | — | (925) 286 7225 | Windows, patio, painters | Lower Lake · Lake County | — | — |
| David Scott White DBA The Glass Guy | The Glass Guy | — | (707) 533 7993 | Windows, patio, painters | Clearlake Oaks · Lake County | — | — |
| David Sullivan DBA Sullivan Construction And Masonry | David Wayne Sullivan | — | (707) 279 0162 | GC, remodel, ADU | Kelseyville · Lake County | — | — |
| Davis Fabrication & Ornamental Designs | Darrell Lynn Davis | — | (707) 263 5858 | Other | Lakeport · Lake County | — | — |
| Delong Plumbing | Delong Plumbing | — | (707) 495 1028 | Other | Hidden Valley Lake · Lake County | — | — |
| Delzompo Controls And Electric | Kevin Joseph Delzompo | — | (707) 287 2573 | Electricians | Hidden Valley Lake · Lake County | — | — |
| Dennis Grove Concrete Pumping INC | Martha Brooke Grove | info@dennisgroveconcretepumping.com | (707) 575 6840 | Other | Middletown · Lake County | — | — |
| Dennis Hall | Dennis Hall | — | (707) 245 8191 | GC, remodel, ADU | Lakeport · Lake County | — | — |
| Denson Premium Remodeling | Denson Premium Remodeling | — | (707) 350 4825 | GC, remodel, ADU | Clearlake · Lake County | — | — |
| Derek J Andress | Derek J Andress | — | (707) 337 1491 | Other | Hidden Valley Lake · Lake County | — | — |
| Devon Titterington Construction | Devon Kay Titterington | — | (707) 350 6243 | GC, remodel, ADU | Upper Lake · Lake County | — | — |
| Dezco Construction | Michael Joseph Desmond | — | (707) 239 2766 | GC, remodel, ADU | Hidden Valley Lake · Lake County | — | — |
| Diamond Property Inspections | Diamond Property Inspections | — | (951) 351-1855 | Inspectors | Lake Mathews · Lake County | — | — |
| Dillsaver Construction | John Edward Dillsaver | — | (707) 263 7624 | GC, remodel, ADU | Lakeport · Lake County | — | — |
| Dirtworx General Engineering | Dirtworx General Engineering | — | (707) 318 4441 | Other | Kelseyville · Lake County | — | — |
| Dixon's Backhoe Service And General Engineering | Mark Christopher Dixon | — | (707) 322 0912 | Other | Middletown · Lake County | — | — |
| Dkd General Construction | Danny Keith Dix | — | (707) 472 7683 | GC, remodel, ADU | Kelseyville · Lake County | — | — |
| Don Cowden Const INC | Deborah Jean Rogers | — | (707) 998 4339 | GC, remodel, ADU | Clearlake Oaks · Lake County | — | — |
| Don Joseph Builder | Don Joseph Builder | — | (415) 246 5465 | GC, remodel, ADU | Clearlake · Lake County | — | — |
| Don S Andre Contractor | Don S Andre Contractor | — | (707) 272 2247 | GC, remodel, ADU | Kelseyville · Lake County | — | — |
| Douglas Snyder | Douglas Snyder | — | (650) 387 9197 | GC, remodel, ADU | Clearlake Oaks · Lake County | — | — |
| Duncan Electric LLC | Matthew Evans Duncan | — | (707) 684 0211 | Electricians | Lakeport · Lake County | — | — |
| Duran Construction | Juan Jorge Duran | — | (707) 295 7720 | GC, remodel, ADU | Clearlake · Lake County | — | — |
| Dustin J Wallace Construction | Dustin James Wallace | — | (707) 293 6307 | GC, remodel, ADU | Lower Lake · Lake County | — | — |
| Dustin Roberts Construction Incorporated | Dustin Alan Roberts | — | (707) 803 2111 | GC, remodel, ADU | Clearlake · Lake County | — | — |
| Duvall Construction | Jon Zachary Duvall | — | (707) 303 5744 | GC, remodel, ADU | Lower Lake · Lake County | — | — |
| E C S Construction | Eric Charles Stephenson | — | (707) 349 1303 | GC, remodel, ADU | Upper Lake · Lake County | — | — |
| E J Ricci General Engineering Company INC | Eugene John Ii Ricci | — | (707) 483 6949 | Other | Glenhaven · Lake County | — | — |
| E&m Plastering INC | Mark Evan Bennett | — | (707) 275 2550 | Other | Witter Springs · Lake County | — | — |
| Eden Tile Design | Eden Tile Design | — | (707) 671 6619 | Other | Hidden Valley Lake · Lake County | — | — |
| Elbow Grease Window Cleaning | Elbow Grease Window Cleaning | — | (760) 462-2576 | Windows, patio, painters | Carlsbad · Lake County | — | — |
| Electrical Power Installation Contractor | Ryan Jason Mobley | — | (707) 830 0311 | Electricians | Hidden Valley Lake · Lake County | — | — |
| Elite Window And Shower Door LLC DBA Valley Glass | Jeremy Wayne Jones | — | (707) 994 7574 | Windows, patio, painters | Clearlake · Lake County | — | — |
| Elliott Plumbing | Elliott Plumbing | robert@elliott-plumbing.com | (707) 905 7056 | Other | Clearlake · Lake County | — | — |