This independent preparation guide covers the 1st Class Building Construction Management Engineer (一級建築施工管理技士) credential across construction methods and planning, quality and materials, safety/schedule/site control, and regulations/contracts/management. The credential is assessed in two stages, 第一次検定 and 第二次検定, and candidates must confirm current eligibility, application windows, fees, detailed question format, weighting and pass criteria with 一般財団法人建設業振興基金 before applying. Practice here uses an original 20-question multiple-choice diagnostic together with an open written site scenario and self-check rubric; the MCQs check supporting knowledge and are not a simulation of the live examination or of any descriptive written task. Answers and explanations are embedded in the 20-question set. For the integrated task, use the Section 7 rubric and score reasoning, calculations and records rather than only final answers. Verify all current official requirements with the issuing body.
What the credential covers and how to use this guide
The 1st Class Building Construction Management Engineer is a Japanese construction-management credential assessed in two stages; this guide builds supporting knowledge and written reasoning.
The 1st Class Building Construction Management Engineer (一級建築施工管理技士) is a Japanese credential for managing building construction. The assessment route runs through 第一次検定 and 第二次検定. Preparation should connect construction method choices to schedule, quality, safety, contracts and the lawful start of work.
This package is organised into four domains: construction methods and planning; quality and materials; safety, schedule and site control; and regulations, contracts and management. The 20 questions are a diagnostic, not full syllabus coverage. The integrated task asks you to produce a short, defensible construction-management response under site constraints.
Before applying, confirm current eligibility, application windows, fees, detailed question format, subject weighting and pass criteria with 一般財団法人建設業振興基金. Do not assume that another level's criteria or an older syllabus applies. Use this material to practise reasoning and documentation, not to memorise answers.
Priority map: what to secure first
Prioritise critical-path logic, concrete quality controls, excavation and lifting safety, and lawful change/start procedures.
High-leverage topics are those that change project outcome or create legal or safety exposure. In planning, secure critical path, total float and method selection. In quality, secure water/cement ratio, cover, compaction and acceptance testing. In safety, secure excavation protection, crane lift control and fall protection. In management, secure building confirmation before work, written change control and subcontracting/supervision roles.
Classify each topic as calculation, rule, or judgement. Calculations should be practised until units and interpretations are automatic. Rules need a short checklist and a named confirmation point. Judgement scenarios need a habit of stating the risk, the control, the verification and the record.
Build four one-page sheets: a network calculation sheet, a concrete and earthwork inspection sheet, a daily safety control sheet, and a contract/change memo template. Review errors by cause: misread logic, missing units, wrong acceptance interpretation, or unclear responsibility.
Construction methods and planning: mechanisms and worked scenario
Critical-path logic and ground/water conditions drive method selection; formwork removal must follow strength requirements.
Critical path is the longest path through the network and sets the minimum project duration. Total float is the time an activity can be delayed without delaying completion. Worked scenario: A takes 3 days; B and C follow A, taking 4 and 5 days; D follows both and takes 2 days; E follows D and takes 3 days. A runs 0–3; B 3–7; C 3–8; D must wait for C, so 8–10; E 10–13. Completion is 13 days, and the critical path is A–C–D–E. B's late finish is day 8, so its total float is 8−7 = 1 day.
Excavation method selection depends on depth, soil, groundwater and adjacent structures. In loose saturated sand with a nearby building, an earth-retaining system with controlled dewatering and settlement monitoring is a defensible planning choice. Sump pumping alone may not control high groundwater and can cause ground loss. Spoil and plant loads near the edge add surcharge and must be controlled.
Formwork and shores are not removed by clock time alone. They remain until the concrete reaches the strength specified for stripping, verified by testing or an approved method. Concrete placement should be planned as continuous work with adequate crews and plant, or with approved construction joints. Adding water to extend workability is not a planning solution.
Quality and materials: concrete, reinforcement and compaction
Control water/cement ratio, cover and in-place density; interpret test results against the specified acceptance criterion.
Fresh concrete quality is sensitive to water content. Adding water raises slump, but it also raises the water/cement ratio and can reduce strength, durability and dimensional stability. If slump is below target, the response is to follow the approved mix and site procedure, not to let a worker add water informally. Acceptance should use representative samples, calibrated equipment and recorded results.
Reinforcement cover protects steel from corrosion and contributes to fire resistance. Before placement, check bar size, spacing, laps, spacers and cover. If measured cover is 20 mm where 40 mm is specified, the correct action is to adjust spacers or bar position, re-inspect and document before concrete is placed. Reducing the specified cover to match the error is not a quality decision.
Compaction is verified by comparing field dry density with laboratory maximum dry density. If maximum dry density is 1.80 g/cm³ and field dry density is 1.62 g/cm³, the compaction ratio is 1.62 ÷ 1.80 = 0.90, or 90%. If the specification requires 95%, the lift fails. Recompact or replace as approved, retest, and record the disposition. Do not accept a lift because the surface looks firm.
Safety, schedule and site control
Worker entry, lifting and fall hazards need physical controls; schedule recovery must target the critical path.
Excavation safety begins with preventing collapse. Workers should not enter a 3 m trench in unstable soil without a protective system and competent assessment. Spoil should be set back from the edge, water controlled, and access and egress provided. A loose plywood sheet over a floor opening is not adequate fall protection; use a secured, marked cover or guardrail that prevents displacement and carries expected loads.
Crane safety depends on load path control. The operator must work within the load chart, on verified bearing, with outriggers or mats as needed. If the operator cannot see the landing area, use a dedicated signaler and a defined communication method; stop the lift if communication is lost. Hand-guiding a load by any nearby worker is not a substitute for a planned lift.
Schedule recovery follows the same logic as planning. If a critical-path activity is three days late while a noncritical activity with five days of float is one day late, accelerating the noncritical activity does not protect completion. Recover the critical path, verify remaining logic and resources, and update the look-ahead. Progress monitoring should compare planned versus actual, but it should not simply rebaseline to match delay.
Regulations, contracts and management
Lawful start, written change control and clear supervision/subcontracting responsibilities are core management controls.
Construction requiring building confirmation must not begin before confirmation is obtained. If an owner asks for an early start, the management response is to explain the legal sequence, document the instruction and reorganise the schedule so work that lawfully can proceed does so without breaching the confirmation requirement. Verbal urgency does not replace the required approval.
Changes should be managed in writing. When an owner requests extra scope, the contractor should document the request, assess cost and time impact, and obtain written agreement before execution. This protects both parties and keeps the baseline, payment and records consistent. Contract type also allocates risk: a unit-price contract with measured quantities and agreed rates handles quantity uncertainty more clearly than a lump-sum arrangement with no measurement.
Subcontracting must not become a transfer of the entire management responsibility. A main contractor that plans to subcontract the whole building scope to one subcontractor and provide no site management creates a serious compliance and control problem. The contractor must retain the required management and comply with subcontracting rules. The design-side supervising engineer checks conformity with design documents and reports nonconformities; this is distinct from the contractor's production management.
Integrated practice task and self-check rubric
Use the scenario to practise a complete management response: schedule, method, quality, safety, contract and record.
Scenario: an eight-storey building on a tight urban site has high groundwater, a neighbouring structure 4 m away, and a 30-day structural cycle target. The mini-network is: A foundations 6 days; B columns 5 days after A; C slab 4 days after B; D facade 6 days after C; E MEP rough-in 8 days after C; F interior 7 days after both D and E. Prepare a one-page response covering the following tasks.
Task 1: Calculate the project duration and critical path. Task 2: Select an excavation support and dewatering concept for the saturated ground and explain two monitoring points. Task 3: Write a concrete quality check for cover and one earthwork compaction calculation using field density 1.62 g/cm³ and laboratory maximum 1.80 g/cm³ against 95% acceptance. Task 4: List three safety controls for excavation and crane lifting. Task 5: Draft a short change-order memo for an owner-requested facade upgrade that affects cost and sequence. Model check for Task 1: A 0–6; B 6–11; C 11–15; D 15–21; E 15–23; F starts after the later of D and E at day 23 and ends day 30, so the duration is 30 days and the critical path is A–B–C–E–F, with 2 days of float on D.
Self-check rubric: (1) Schedule logic — correct durations, dependencies, critical path and float; 0–2 points. (2) Method choice — links ground/water/adjacent conditions to support and dewatering; 0–2. (3) Quality reasoning — states acceptance criterion, calculation and disposition; 0–2. (4) Safety control — names physical controls and stop criteria; 0–2. (5) Contract and record — documents scope, cost, time and approval before work; 0–2. A strong answer is concise, uses units, names verification and records the decision. It is practice, not an official examination simulation.
Common errors and a practical study sequence
Avoid mechanical memorisation; use calculations, checklists and written explanations to expose weak reasoning.
Common errors include treating the longest single activity as the critical path; accelerating a noncritical activity while the critical path remains late; adding water to concrete; removing formwork after a fixed time without strength verification; accepting failed compaction because the surface looks firm; allowing worker entry into an unprotected trench; lifting without a signaler or verified bearing; starting work before building confirmation; performing verbal changes without records; and applying another level's pass mark, question format or eligibility rules to the first-class credential.
Use a six-week sequence. Week 1: take the 20-question diagnostic, make an error log, and build the four one-page sheets. Week 2: practise network calculations and method selection scenarios. Week 3: practise concrete, cover and compaction calculations. Week 4: work through excavation, lifting and fall-protection scenarios, writing the hazard, control and verification for each. Week 5: study lawful start, contract change, supervision and subcontracting responsibilities. Week 6: complete the integrated task under time, score it with the rubric, and revisit only weak areas.
Keep a daily 45–60 minute block. End each session by writing a five-line site memo: issue, evidence, decision, responsible person and follow-up. Before applying, reconfirm current official requirements with the issuing body. This package is independent review material, not a guarantee of any result.
References and further reading
Use these references to explore the concepts and check the latest information from the relevant organizations.