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Key Facts: CSLB C-47 Exam

3.5 Hours

Time Limit

CSLB Study Guide

22%

Installation Weight

CSLB Exam Outline

$450

Application Fee

CSLB Fee Schedule

4 Years

Required Experience

CSLB Licensing Requirements

21%

Safety Focus

CSLB Exam Outline

The CSLB C-47 General Manufactured Housing exam is a 3.5-hour computer-delivered test administered by PSI. It requires 4 years of journey-level experience, a $450 application fee, and covers planning, site prep, installation, accessories, repairs, and safety.

Sample CSLB C-47 Practice Questions

Try these sample questions to review concepts for the CSLB C-47 exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1What initial training requirement must a C-47 contractor fulfill before obtaining authorization to perform manufactured home installations?
A.Completion of an HCD-approved initial installer training course
B.Completion of a 40-hour Cal/OSHA heavy equipment operator course
C.Submission of a 100-hour residential framing apprenticeship card
D.Completion of an EPA certified lead-safe renovator training class
Explanation: California requires C-47 contractors to complete an HCD or HUD-approved initial installer training course before installing manufactured homes. This coursework covers structural setup, foundation load path design, anchoring, and utility crossover procedures. The federally approved initial installer training must be completed before the classification is obtained. Continuing education is also required to maintain active certification.
2A 14-foot wide single-section manufactured home has a total roof live and dead load of 40 psf. If piers are spaced at 6-foot intervals along each main chassis beam, what concentrated load must each intermediate chassis pier support?
A.840 lbs of roof load
B.1,680 lbs of roof load
C.3,360 lbs of roof load
D.5,040 lbs of roof load
Explanation: Each main chassis beam carries half the width of the home, giving a 7-foot tributary width. For a 6-foot pier spacing, the roof tributary area per pier is 7 ft x 6 ft = 42 sq ft. At 40 psf, the roof load per pier is 42 sq ft x 40 psf = 1,680 lbs. Additional floor dead and live loads must be added when sizing the final footing area per federal installation standards.
3When planning the installation of a manufactured home on a private lot outside a mobilehome park in California, which agency issues the installation permit?
A.California Department of Transportation Highway Division
B.Contractors State License Board Enforcement Division
C.Local City or County Building Enforcement Department
D.Federal Housing Administration Regional District Bureau
Explanation: Under California regulations, installations on private lots outside mobilehome parks are permitted and inspected by the local building enforcement agency, typically the city or county building department. Installations within mobilehome parks generally fall under HCD jurisdiction unless delegated to a local enforcement agency. The contractor must confirm which agency has authority before scheduling inspections.
4What primary technical document governs the structural setup, blocking, and tie-down locations during the installation of a new manufactured home?
A.The generic California Residential Building Code table
B.The local city general land use zoning ordinance map
C.The national electrical code emergency backup section
D.The manufacturer's DAPIA-approved installation manual
Explanation: Federal installation standards require every new manufactured home to be installed in strict accordance with the manufacturer's DAPIA-approved installation manual. The manual specifies pier locations, tie-down spacing, blocking heights, and crossover connections unique to that home model. If the manual is unavailable, an installation design engineered by a registered professional engineer complying with federal or state standards must be used.
5A pier block supports a concentrated load of 4,500 lbs. If the site soil has an allowable soil bearing capacity of 1,500 psf, what minimum pre-cast concrete footing pad area is required?
A.3.0 sq ft
B.2.0 sq ft
C.4.5 sq ft
D.6.0 sq ft
Explanation: Footing area is calculated using the formula Area = Load divided by Soil Bearing Capacity. Dividing 4,500 lbs by 1,500 psf yields 3.0 sq ft. A standard 22-inch by 22-inch square footing pad (approximately 3.36 sq ft) or a 24-inch diameter round pad (3.14 sq ft) satisfies this minimum. The contractor must round up to the next available pad size.
6What must a C-47 contractor verify regarding site utility connection points before finalizing an installation cost estimate?
A.Verify utility meters are mounted inside the home crawl space
B.Verify utility locations match home utility connection outlets
C.Verify electric utilities provide three-phase 480V industrial power
D.Verify water utilities provide minimum 120 psi main pressure
Explanation: During pre-installation planning, the contractor must verify that existing park or site utility pedestals for water, sewer, gas, and electrical align properly with the manufactured home's utility service entry points. Proper sizing, shutoff valve locations, and clearance requirements must comply with state regulations. Misaligned utilities can require costly site modifications such as trenching or riser relocation. Verifying these points before finalizing the estimate prevents change orders and delays.
7Where are perimeter piers required along the exterior marriage line of a multi-section manufactured home?
A.Perimeter piers are only required at the four home corners
B.Perimeter piers are only required beneath interior partition walls
C.Perimeter piers are required under load-bearing wall openings
D.Perimeter piers are required under non-structural window frames
Explanation: Federal installation standards and DAPIA manuals require perimeter piers under concentrated load points along the marriage line. These include the sides of exterior door openings, large patio door openings, marriage wall openings exceeding 4 feet, and structural ridge posts. These piers transfer roof and wall loads directly to the foundation. Skipping them at load-bearing openings can cause sagging headers and structural failure.
8How often must certified manufactured home installers complete continuing education requirements to maintain active certification status in California?
A.Annually
B.Every 5 years
C.Every 10 years
D.Every 3 years
Explanation: Under federal installer certification guidelines and HCD requirements, certified manufactured home installers must complete approved continuing education courses every 3 years on a triennial renewal cycle. These courses cover code changes, updated tie-down standards, and safety regulations. Failure to complete continuing education can result in suspension of installer certification.
9When planning an installation in a California mountain zone with a roof snow load exceeding 40 psf, what structural design requirement applies?
A.The home must be installed with DAPIA high-snow engineering plans
B.Standard 20 psf single-wide pier blocking spacing may be used
C.Ground anchors are prohibited in areas prone to heavy snow accumulation
D.Under-floor crawl space ventilation must be completely eliminated
Explanation: Manufactured homes placed in high snow load regions exceeding standard baseline ratings require DAPIA-approved high snow load design plans. Alternatively, site-specific engineering calculations prepared by a California licensed engineer may be used. Standard pier spacing for normal load conditions is insufficient for snow loads above 40 psf. The installation must account for the additional roof load in pier capacity and footing sizing.
10A contractor is estimating 6-mil polyethylene ground vapor retarder material for a 28 ft x 60 ft multi-section home crawl space. Allowing 10% extra for seam overlaps, how much plastic sheeting is required?
A.1,512 sq ft
B.1,848 sq ft
C.2,156 sq ft
D.2,464 sq ft
Explanation: The base area of the crawl space is 28 ft x 60 ft = 1,680 sq ft. Adding 10% for the required 12-inch seam overlaps and edge turn-ups gives 1,680 x 1.10 = 1,848 sq ft. Minimum 6-mil black polyethylene is required under federal and state installation standards. The contractor should round up to the nearest available roll size.

About the CSLB C-47 Exam

The C-47 General Manufactured Housing examination tests knowledge of installing, altering, repairing, and preparing sites for manufactured homes and mobilehomes in California.

Exam sponsor: California Contractors State License Board (CSLB). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Question count not published by the exam provider

Time Limit

3.5 hours

Passing Score

Disclosed at test site

Exam / Certification Fees

$450 application fee

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

15%

Planning and Estimating

Evaluating plans and specifications, estimating materials and labor, and applying California Title 25 and HUD code requirements.

17%

Site Preparation

Evaluating soil conditions, grading, drainage, layout, and utility connections.

22%

Manufactured Home Installation

Installing foundations, piers, tie-downs, marriage lines, roofing, siding, and utility crossovers.

12%

Accessory Installation

Installing awnings, skirting, stairs, decks, and ramadas.

13%

Repairs

Troubleshooting and repairing structural, plumbing, electrical, and mechanical systems of manufactured homes.

21%

Safety

Cal/OSHA safety requirements, personal protective equipment, hazard communication, and safe use of tools.

Preparing for the CSLB C-47 Exam

What You Need to Know

  • Passing score: Disclosed at test site
  • Assessment: Question count not published by the exam provider
  • Time limit: 3.5 hours
  • Exam / certification fees: $450 application fee Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

CSLB C-47: Suggested Study Strategy

1Review CCR Title 25, specifically Division 1, Chapter 2 for Mobilehome Parks and Installations.
2Familiarize yourself with HUD 24 CFR Part 3280 and 3285 (Model Manufactured Home Installation Standards).
3Understand load calculations and pier spacing for different soil bearing capacities.
4Study Cal/OSHA Title 8 safety regulations, especially regarding excavations, scaffolding, and fall protection.
5Practice structural layout, marrying multi-section homes, and utility crossover connections.

Frequently Asked Questions

What is the format of the CSLB C-47 exam?

The exam is a multiple-choice, computer-delivered test administered by PSI. It lasts 3.5 hours and the total number of questions is not publicly disclosed.

What are the experience requirements for the C-47 license?

You must have at least 4 years of qualifying journey-level experience in general manufactured housing within the past 10 years.

Do I need special training besides experience?

Yes, applicants typically need federally approved initial installer training in addition to experience for manufactured home installations.

What codes are covered on the exam?

The exam covers California Code of Regulations (CCR) Title 25, HUD Manufactured Home Construction and Safety Standards (24 CFR 3280), Cal/OSHA Title 8, and other relevant building codes.

What is the passing score?

The passing score is determined by the CSLB and is disclosed at the test site upon completion of your exam.