California Class B Trade
CSLB Class B (General Building) trade exam covering core trades, framing and structural work, finish trades, safety, and planning and estimating. Closed book.
Content Areas
Core Trades
Concrete, masonry, roofing, plumbing, electrical, and HVAC fundamentals for general building work.
399Q available · 29% weight
Finish Trades
Drywall, paint, flooring, tile, cabinetry, and other interior finish work.
268Q available · 20% weight
Framing & Structural
Wood framing, shear walls, seismic requirements, foundations, and structural connections.
280Q available · 20% weight
Safety
Fall protection, excavation and trenching, scaffolding, and Cal/OSHA jobsite rules.
239Q available · 17% weight
Planning & Estimating
Plan reading, take-offs, material quantities, scheduling, and job estimating.
200Q available · 14% weight
Practice Questions
Core Trades
399QA rough inspection is scheduled, but insulation has already concealed plumbing and electrical work in several walls. What should be maintained?
mediumA kitchen exhaust duct has no backdraft control where the approved equipment calls for it. What should be checked?
mediumA fuel-burning appliance closet draws combustion air from a garage with vehicle exhaust exposure. What should be reviewed?
mediumA device box is crowded with conductors beyond the planned box-fill allowance. What should be reviewed?
mediumConcrete wash water from tool cleanup is flowing toward a storm inlet. What should be corrected?
mediumA horizontal drain is installed at 3/16 inch fall per foot. What fall is needed over 64 feet?
mediumStorage shelves are installed directly in front of an electrical panel. What should be maintained?
mediumReinforcing steel is pushed to the bottom of a slab during placement. What should be maintained?
mediumBelow-grade waterproofing is complete, but no protection board is installed before rocky backfill. What should be added?
mediumA 240-volt load is rated at 3,600 watts. What current does the load draw?
mediumA water heater relief line is reduced in size and routed uphill before termination. What should be corrected?
mediumA 2-inch branch drain is laid at 1/4 inch fall per foot. What fall is needed over 31 feet?
mediumA combustion-air grille for a fuel-burning appliance is blocked by stored boxes. What is the concern?
mediumA 2-inch horizontal sanitary branch must be installed at 1/4 inch fall per foot. What total fall is needed over a 24-foot run?
mediumA 4-inch building drain is laid out with a required 1/8 inch fall per foot. What fall is required across 40 feet?
mediumA concrete housekeeping pad is 6 feet by 4 feet by 6 inches thick. How many cubic feet of concrete are needed before waste?
mediumA slab area is 18 feet by 14 feet, and the base rock layer is 4 inches thick. About how many cubic yards of base rock are needed before compaction loss?
mediumA swale must fall 2 percent over a 50-foot run. What vertical fall is required?
mediumA 500-square-foot attic area receives insulation at $1.35 per square foot. What is the material cost?
mediumA 120-volt load draws 14 amperes. What wattage is the load using?
mediumA slab is 30 feet by 14 feet by 5 inches thick. About how many cubic yards of concrete are needed before waste?
mediumA 2-inch horizontal sanitary branch is laid at 1/4 inch fall per foot. What fall is needed over 42 feet?
mediumA 240-volt heater draws 18 amperes. What wattage is the load using?
mediumA roof plane measures 36 feet by 28 feet. How many roofing squares are there before waste?
mediumA 14-foot by 22-foot room receives gypsum board on the ceiling. How many square feet of board are needed before waste?
mediumA pump removes 22 gallons per minute for 35 minutes. How many gallons are removed?
mediumAn exhaust fan is rated 110 cfm. How much air does it move in 18 minutes?
mediumA site swale must drop 2 percent over 65 feet. What fall is required?
mediumA crew needs 28 bags of grout, and each bag covers 18 square feet. How many square feet can be grouted?
mediumA rough grade pad must fall 1.5 percent across 84 feet. What fall is required?
medium+ 369 more questions
Finish Trades
268QA tall pantry filler is installed square against an out-of-plane plaster return, leaving a tapered gap. What finish method should be used?
mediumA replacement window is installed without integrating flashing with the water-resistive barrier. What risk increases?
mediumA wall has 640 square feet of drywall area. Using 4-foot by 8-foot sheets, how many sheets are needed before waste?
mediumA wood floor area is 420 square feet. Material costs $7.25 per square foot, and waste is 8 percent. What material cost should be estimated?
mediumA cabinet crown molding run is 24 feet long, and 12 percent waste is added for cuts. How many linear feet should be ordered?
mediumA bedroom wall has 760 square feet of paint area and needs primer plus two finish coats. If each coat covers 380 square feet per gallon, how many total gallons are needed before attic stock?
mediumA room has 1,024 square feet of drywall surface. Using 4-foot by 8-foot sheets, how many sheets are needed before waste?
mediumA shower wall tile system is installed before the required waterproofing inspection. What should remain available?
mediumA wood floor covers 360 square feet, and the installer adds 7 percent waste. What order quantity results?
mediumCabinet installation is priced at $74 per linear foot for 19 linear feet. What labor cost should be estimated?
mediumA stair trim order contains 17 pieces at $22 each. What is the material subtotal before tax, delivery or further allowances?
mediumA room needs 68 linear feet of crown molding, and each stick is 16 feet long. How many sticks are needed before waste?
mediumA shower wall has 96 square feet of tile area and uses 10 percent waste. How many square feet should be ordered?
mediumAn 840-square-foot wall needs one primer coat and one finish coat. Each product covers 350 square feet per gallon. What is their combined theoretical liquid volume before waste, attic stock or container rounding?
mediumA floor area is 415 square feet and requires 9 percent waste. How many square feet should be ordered?
mediumThe interior repaint worksheet shows a painter completes 36 doors at 22 minutes per door. How many labor hours are used?
mediumA room is 18 feet by 13 feet. Flooring costs $3.85 per square foot. What material cost is estimated before waste?
mediumA crew installs 44 cabinet pulls at 7 minutes each. How many labor hours are used?
mediumA crew installs 72 door stops at 4 minutes each. How many labor hours are used?
mediumA project has 1,120 square feet of wall area and needs primer plus two finish coats. If coverage is 280 square feet per gallon per coat, how many gallons are needed before attic stock?
mediumThe gypsum-board worksheet shows a ceiling area totals 1,152 square feet. Using 4-foot by 8-foot drywall sheets, how many sheets are needed before waste?
mediumBase cabinets total 38 linear feet on the installation schedule, with labor budgeted at $84 per foot. What labor amount should be carried?
mediumA room needs 126 linear feet of base cap, and each stick is 14 feet long. How many sticks are needed before waste?
mediumA room is 18 feet by 12 feet. Flooring waste is 5 percent. How many square feet should be ordered?
mediumA flooring transition creates a sharp raised edge at a doorway. What should be corrected?
mediumA mirror is installed with adhesive alone on a dusty painted wall without mechanical support where specified. What is the concern?
mediumA shower wall tile is set before the specified waterproofing inspection is accepted. What is the sequencing problem?
mediumA rated door closer is disconnected so the door stands open. What should be restored?
mediumA punch list item says an operable window sticks because paint sealed the sash shut. What trade correction is needed?
mediumA ceiling has 768 square feet of drywall area. Using 4-foot by 8-foot sheets, how many sheets are needed before waste?
medium+ 238 more questions
Framing & Structural
280QUntreated wood sill material is placed directly on a concrete stem wall where decay protection is required. What should be corrected?
mediumAnchor bolts are installed in a sill plate, but debris prevents the sill from bearing tight to the foundation. What should be done?
mediumA 12-foot ledger is laid out for deck joists at 16 inches on center with a joist at each end. How many joists are needed?
mediumA stair has a total rise of 105 inches. If the problem limit is a maximum 7.5 inches per riser, how many risers are needed?
mediumA hip roof plane is 30 feet by 16 feet. How many square feet of sheathing does that rectangular plane require before waste?
mediumA roof plane is 26 feet by 18 feet. How many square feet of roof sheathing are needed before waste?
mediumTemporary shoring posts are planned every 6 feet along a 42-foot beam line, including both ends. How many posts are needed?
mediumA stair has total rise of 105 inches and 15 equal risers. What is the riser height?
mediumA wall section is 11 feet high and 18 feet long. What is its framed wall area?
mediumA 20-foot by 18-foot room needs subfloor panels. Using 4-foot by 8-foot panels, how many panels are needed before waste?
mediumIn the garage conversion file, a shear wall edge is 120 inches long with nails at 4 inches on center. How many nail spaces are along that edge?
mediumA wall section is 24 feet long and 10 feet high. What wall sheathing area is needed before openings?
mediumA 96-inch shear panel edge is nailed at 6 inches on center. How many nail spaces are along that edge?
mediumA deck surface is 14 feet by 24 feet, and decking costs $5.75 per square foot. What material cost is estimated before waste?
mediumA specified temporary support layout places posts every 6 feet along a 42-foot bearing line, including both ends. How many posts does this layout contain?
mediumThe rear roof face worksheet shows a roof sheathing area is 38 feet by 24 feet. How many square feet are needed before waste?
mediumIn the casework package file, a stair has a total rise of 119 inches and 17 equal risers. What is each riser height?
mediumBlocking is laid out every 16 inches along a 12-foot opening, including both ends. How many blocking locations are needed?
mediumA 21-foot partition wall is framed at 16 inches on center with a stud at each end. How many layout studs are needed before openings?
mediumThe composition-shingle roof worksheet shows a roof sheathing area is 44 feet by 21 feet. How many square feet are needed before waste?
mediumIn the shower replacement file, a stair has a total rise of 112 inches and 16 equal risers. What is each riser height?
mediumThe garage wall sheathing takeoff shows a wall section 31 feet long and 9 feet high. What sheathing area is needed before openings?
mediumA roof diaphragm is nailed off before missing roof-to-wall clips are installed at the exterior wall. What is incomplete?
mediumA shear wall panel is cut open after inspection to add a recessed cabinet. What should be obtained before closing it?
mediumThe wall blocking worksheet shows blocking is laid out every 12 inches along a 15-foot opening, including both ends. How many blocking locations are needed?
mediumA crew stacks drywall on an unfinished framed floor where no staging load review has been made. What should be checked?
mediumA stucco wall is missing the required lath fastening pattern around an opening. What is the most likely concern?
mediumA crew stores bundles of lumber on one small area of a framed floor beyond the planned staging limit. What should be checked?
mediumThe subfloor takeoff covers a 17-foot by 26-foot floor using 4-foot by 8-foot panels. How many panels are needed before waste?
mediumA top plate is heavily bored for piping with no metal strap or repair detail where required. What should be checked?
medium+ 250 more questions
Safety
239QA deck platform is rated for 50 pounds per square foot and has 140 square feet. What total load rating does that represent?
mediumA worker is assigned required tight-fitting respiratory protection for hazardous dust work, but no fit testing or training has been arranged. Which program is missing?
mediumWorkers enter a trench with vertical sides and no protective system where cave-in protection is required. What is missing?
mediumA forklift travels with a raised load through a crowded doorway. What concern should be addressed?
mediumAn outdoor crew works at an actual 84°F with water but no shade access. No equivalent-cooling or infeasibility alternative applies. What is missing?
mediumA suspended drywall stack is lifted over workers installing track below. What should be enforced?
mediumA temporary cord crosses a wet walkway without protection. What should be corrected?
mediumSparks from hot work can reach stored cardboard behind a partition. What control should be added?
mediumStored drywall sheets lean into a hallway used as the site's emergency route. What should be corrected?
mediumA worker is on a roof edge and the fall-protection plan is missing. What should be addressed before work proceeds?
mediumA flagger stands in low-visibility clothing at dusk. What should be corrected?
mediumA cord crosses a wet walkway and has no protection from water or traffic. What is the best control?
mediumA first-aid kit is locked in a truck that leaves the project for deliveries. What readiness issue exists?
mediumScrap with protruding nails is piled beside the main walkway. What housekeeping action is needed?
mediumA worker grinds overhead metal while wearing safety glasses only, and sparks are striking the face. What should be added?
mediumFifteen drywall sheets weigh 72 pounds each. What total weight is being moved?
mediumA circular saw is used after the lower guard stops returning over the blade. What should be done?
mediumA worker sees cracks forming parallel to a trench edge during pipe placement. What should happen first?
mediumA flagger is assigned to dusk work wearing dark clothing. What should be corrected?
mediumA scissor lift is assigned to a worker who has not been trained on the equipment. What should happen before operation?
mediumThe outdoor crew has twenty-two workers who each need one quart of water per hour for 3 hours. How many quarts should the site stage?
mediumA worker reaches into a mixer to clear a jam while it remains energized. What practice is missing?
mediumA ladder extends into a forklift travel path with no barricade or spotter. What should be controlled?
mediumA 24-foot extension ladder is set using a 4-to-1 ratio. How far should the base be from the wall?
mediumDust controls are provided, but workers dry-sweep settled concrete dust at the end of shift. What should be changed?
mediumA 14-worker crew works outdoors for 8 hours. At one quart per worker per hour, how many quarts of water are needed?
mediumA traffic-control taper uses a project rule of 10 feet of taper per 1 mph of speed. At 25 mph, what taper length is required?
mediumA 10-worker crew needs one quart of water per worker per hour for 7 hours. How many gallons are needed?
mediumSixteen outdoor workers have a five-hour task with no continuous water supply or replenishment. Using one quart available per worker per hour, how many quarts are needed?
mediumA safety inspection finds 12 hazards, and 9 are corrected by Friday. What percent were corrected?
medium+ 209 more questions
Planning & Estimating
200QA project has repair work above a shared driveway. What planning cost should be considered?
mediumBefore bidding a deck repair, the plan calls out one beam size but the existing posts are spaced differently. What is the best estimating response?
mediumA contractor finds concealed termite damage after removing siding. What should be documented before extra repair work proceeds when time allows?
mediumThe excavation takeoff lists a trench 42 feet long, 2.5 feet wide, and 4 feet deep. How many cubic yards are excavated before swell?
mediumA drywall subcontractor excludes fire-rated caulking from its proposal, but rated penetrations are shown in the walls. What estimating issue exists?
mediumA basement slab pour covers a 25-foot by 18-foot rectangle at 4 inches thick. About how many cubic yards are needed before waste?
mediumA wall area takeoff totals 960 square feet. Using 4-foot by 8-foot drywall sheets, how many sheets are needed before waste?
mediumA trench is 30 feet long, 2 feet wide, and 3 feet deep. How many cubic yards of excavation are there before swell?
mediumA 24-square roof estimate includes 12 percent waste. How many total squares should be planned?
mediumA crew of 4 workers works 7.5 hours each on demolition. At $68 per labor-hour burdened cost, what is the labor cost?
mediumA 40-foot run of wall requires blocking every 8 feet. How many blocking intervals are there along the run?
mediumA rectangular footing is 60 feet long, 18 inches wide, and 12 inches deep. How many cubic yards of concrete are needed?
mediumA markup of 15 percent is applied to a $1,792 direct change cost. What total price results?
mediumA 22-foot by 16-foot room receives flooring priced at $6.40 per square foot with 8 percent waste. What material cost should be estimated?
mediumThe paint estimate covers 1,540 square feet of wall area with two coats, and each gallon covers 385 square feet per coat. How many gallons should be planned before attic stock?
mediumA rectangular room is 18 feet by 14 feet and has two 3-foot door openings. How many linear feet of baseboard are needed before waste?
mediumThe roofing material order starts from a 31.5-square estimate and adds 10 percent waste. How many total squares should be planned?
mediumThe tile schedule assumes production of 90 square feet per day. How many full days are needed to complete 455 square feet?
mediumThe underlayment takeoff covers a 16-foot by 13-foot room at $2.80 per square foot. What material cost is shown before waste?
mediumThe walkway panel worksheet starts with an 8.98-cubic-yard concrete takeoff and adds 12 percent waste. What total order quantity results?
mediumThe drywall delivery sheet lists 1,344 square feet of wallboard and uses 4-foot by 8-foot sheets. How many sheets are needed before waste?
mediumA rectangular room is 20 feet by 15 feet and has one 3-foot door plus one 6-foot opening. How many linear feet of baseboard are needed before waste?
mediumThe lobby tile worksheet shows that the tile schedule assumes production of 110 square feet per day. How many full days are needed to complete 525 square feet?
mediumThe strip footing takeoff shows a rectangular footing 80 feet long, 20 inches wide, and 12 inches deep. How many cubic yards of concrete are required?
mediumFor the planning estimate, a $2,257 direct change cost receives a 12 percent markup. What price should the change proposal carry?
mediumThe corridor wallboard delivery sheet lists 1,536 square feet of wallboard and uses 4-foot by 8-foot sheets. How many sheets are needed before waste?
mediumThe corridor paint estimate covers 1,925 square feet of wall area with two coats, and each gallon covers 350 square feet per coat. How many gallons should be planned before attic stock?
mediumThe utility spoils worksheet lists a trench 50 feet long, 2 feet wide, and 4.5 feet deep. How many cubic yards are excavated before swell?
mediumThe interior demolition estimate assigns 4 workers for 9.5 hours each at a burdened rate of $80 per labor-hour. What labor cost should be carried?
mediumThe kitchen tile worksheet shows that the tile schedule assumes production of 75 square feet per day. How many full days are needed to complete 390 square feet?
medium+ 170 more questions
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About California Class B Trade
115
Scored Questions
3.5h
Time Limit
1.8m
Per Question
The California Class B Trade exam is administered by PSI (CSLB). You must score at least 73% to pass this part. The exam is closed book — no reference materials are allowed, so every rule, number, and formula has to come from memory. Repetition-based practice is the fastest way to get there.
CSLB Class B (General Building) trade exam covering core trades, framing and structural work, finish trades, safety, and planning and estimating. Closed book.
What's Tested: 5 Content Areas
29%
Core Trades
Concrete, masonry, roofing, plumbing, electrical, and HVAC fundamentals for general building work.
~33 questions on the exam
20%
Finish Trades
Drywall, paint, flooring, tile, cabinetry, and other interior finish work.
~23 questions on the exam
20%
Framing & Structural
Wood framing, shear walls, seismic requirements, foundations, and structural connections.
~23 questions on the exam
17%
Safety
Fall protection, excavation and trenching, scaffolding, and Cal/OSHA jobsite rules.
~20 questions on the exam
14%
Planning & Estimating
Plan reading, take-offs, material quantities, scheduling, and job estimating.
~16 questions on the exam
Prioritize by Weight
Focus on Core Trades (29%) and Finish Trades (20%) first — they cover the most questions.
Drill From Memory
This exam is closed book — no lookups. Repeat practice sessions until the rules and numbers come to you automatically.
Master the Math
Calculation questions (payroll, overhead, bidding) are common. Practice with our math calculator until the formulas are second nature.
Know Your Statutes
State-specific laws and regulations are heavily tested. Bookmark these sections in your reference books for quick lookup.
Simulate Exam Conditions
Take timed 115-question practice sessions to build stamina for the 3.5-hour exam.
Review Wrong Answers
Use the wrong book feature to revisit missed questions. Understanding why an answer is wrong is as important as knowing the right answer.
Frequently Asked Questions
How many questions are on the California Class B Trade exam?
The California Class B Trade exam contains 115 scored questions. You must answer them within 3.5 hours. The exam is administered by PSI (CSLB) and is closed book — no reference materials are allowed, so the content has to be memorized.
What is the passing score for Class B Trade?
You need a score of 73% or higher to pass the California Class B Trade exam. That means you must answer at least 84 out of 115 questions correctly.
Is the Class B Trade exam open book?
No. The Class B Trade contractor exam is closed book. No reference materials are allowed in the testing room, so every rule, number, and formula has to come from memory.
How long do I have to complete the Class B Trade exam?
You have 3.5 hours (210 minutes) to complete all 115 questions. That averages to about 1.8 minutes per question.
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