How to Pass the California C-27 Landscaping Contractor Exam
Quick answer: Organize study around a project's sequence—from planning and site preparation through hardscape, water and planting systems, maintenance, and safety—while giving equal attention to the two 21% installation sections.
Current C-27 Landscaping exam outline
Official outline used: current CSLB C-27 Landscaping study guide, effective for examinations scheduled on or after July 1, 2026. CSLB describes the percentages as approximate.
| Official section | Approximate weight | What to review |
|---|---|---|
| Planning and Estimating | 18% | Planning, design, and estimating. |
| Construction Preparation | 12% | Site planning, erosion control, trenching, and grading. |
| Hardscape Installation | 21% | Flatwork, masonry, posts, fences, retaining walls, and water features. |
| Drainage, Irrigation, Lighting, and Plant Installation | 21% | Drainage, bioswales, irrigation, lighting, plants, trees, and mulch. |
| Maintenance and Repair | 11% | Pruning, tree removal, irrigation troubleshooting, and hardscape repair. |
| Safety | 17% | Employee, job-site, and tree-work safety. |
A six-week C-27 Landscaping study plan
Peerless suggestion—not a CSLB or PSI requirement: adjust this schedule to your baseline and available time. No schedule can guarantee a passing result.
- Week 1: Study project planning, design, and estimating.
- Week 2: Study site planning, erosion control, trenching, and grading.
- Week 3: Study flatwork, masonry, posts, fences, retaining walls, and water features.
- Week 4: Study drainage, bioswales, irrigation, lighting, plants, trees, and mulch.
- Week 5: Study pruning, tree removal, irrigation troubleshooting, hardscape repair, and tree-work safety.
- Week 6: Complete mixed site-development cases and review errors against all official sections.
Worked hardscape-estimating example
A 20 ft × 12 ft hardscape area is 240 square feet. If an illustrative estimate adds 10% for cuts and waste, 240 × 1.10 = 264 square feet. A real factor must reflect material, pattern, site, and specifications.
C-27 Landscaping study resources
- Free C-27 Landscaping practice test — start without signup; email and marketing-email consent are required to view results.
- C-27 study guide
- C-27 online practice exam
- C-27 study guide and practice-exam bundle
- C-27 and Law & Business bundle
- Official CSLB C-27 Landscaping classification
Do not leave Law & Business until last
Applicants for an original California contractor license generally need the trade examination and Law & Business. Keep a separate study rotation and error log for the business exam.
California exam prep by region
These classifications are statewide. For regional scheduling guidance, see San Diego contractor exam prep, Bay Area contractor exam prep, or Sacramento contractor exam prep.
Frequently asked questions
How should I balance the two largest installation sections?
Hardscape Installation and Drainage, Irrigation, Lighting, and Plant Installation are each approximately 21%, so the plan gives them equal attention.
Where does tree-work safety appear?
The outline includes tree work within Safety and pruning and tree removal within Maintenance and Repair.
Can I begin the free practice test without creating an account?
You can start without signup. An email address and marketing-email consent are required to view the result.
Is Peerless affiliated with CSLB?
No. Peerless is an independent exam-preparation provider and is not affiliated with, endorsed by, or sponsored by CSLB.
Sources
Peerless Institute is independent and is not affiliated with, endorsed by, or sponsored by CSLB. Verify current exam requirements with CSLB.
