--- title: "NBC hierarchy and implementation status" subject: "Construction Management" chapter: 11 key: "semester_8/construction_management:nbc-hierarchy-implementation" source: https://www.bctengineer.com/q/semester_8/construction_management/nbc-hierarchy-implementation site: BCT Engineering --- # NBC hierarchy and implementation status Construction Management · Chapter 11: Regulatory Requirements - Asked in: 2079 Jestha, 2 marks - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_8/construction_management/nbc-hierarchy-implementation - Whole chapter: https://www.bctengineer.com/md/semester_8/construction_management/chapter-11 ## Question Explain NBC (Nepal National Building Code) hierarchy and its current implementation status to regulate the building construction work in the country. ## Short answer The NBC has four levels: international state-of-the-art, professionally engineered (NBC 101-114), Mandatory Rules of Thumb (MRT) for small buildings, and rural guidelines. It is legally enforced under the Building Act, with municipalities issuing permits only for code-compliant designs. Implementation remains weak in rural areas with few inspections. ## Answer The **Nepal National Building Code (NBC)** was prepared by the Department of Urban Development and Building Construction (DUDBC) in 1993–94, with UNDP/UNCHS (Habitat) support, following the 1988 Udayapur earthquake. It was made mandatory by the government in 2003 (2060 BS). #### Hierarchy The NBC follows a four-level hierarchy, from the most sophisticated design to the simplest construction: - **Level 1 – International state-of-the-art:** for very important or complex buildings, designers may use the latest international codes and practice (NBC 000 introduces these requirements). - **Level 2 – Professionally engineered structures (NBC 101–114):** the main code documents for engineer-designed buildings: 101 material specifications, 102 unit weights, 103 occupancy loads, 104 wind loads, 105 seismic design, 106 snow loads, 107 fire safety, 108 site consideration, 109 masonry, 110 concrete, 111 steel, 112 timber, 113 aluminium and 114 construction safety. - **Level 3 – Mandatory Rules of Thumb (MRT):** for ordinary buildings of limited size, built without detailed calculation: NBC 201 (RC frames with masonry infill), 202 (load-bearing masonry) and 205 (RC buildings without masonry infill). - **Level 4 – Guidelines for remote rural buildings:** for earthquake-resistant construction of owner-built houses: NBC 203 (low-strength masonry) and 204 (earthen buildings). Other codes give service and architectural requirements, e.g. NBC 206 (architectural design), 207 (electrical) and 208 (sanitary and plumbing). The legal base is the **Building Act 2055 (1998)**, the Building Rules, the Local Government Operation Act 2074 and the municipal building bye-laws. #### Implementation status - The NBC is mandatory in municipalities: building permits are issued only if the design follows the code. Since 2072 BS (after the 2015 Gorkha earthquake), more municipalities have applied it, many through an electronic building permit system, and the Mandatory Rules of Thumb are the basis for ordinary buildings. - Weaknesses: poor enforcement in rural areas, few trained inspectors, little inspection after the permit stage, informal construction and low awareness. DUDBC and local governments are revising the codes (e.g. NBC 105:2020) and building capacity. ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. NBC 200 series (Tier 2) is: A. Electrical standards only B. Mandatory Rules of Thumb for ordinary buildings without detailed calculations C. Guidelines for owner-built houses D. Design requirements for engineered buildings Answer: B. Tier 2 is Mandatory Rules of Thumb. (Key point: Tier 2) 2. NBC 105 covers: A. Fire protection B. Wind loads C. Timber D. Seismic design Answer: D. NBC 105 is seismic design. (Key point: Tier 1) 3. A weakness in implementation is: A. No code exists B. Poor enforcement in rural areas and no inspection after permit C. Full enforcement D. Too many inspectors Answer: B. Weak enforcement and limited inspectors. (Key point: Weakness) ## Related in Construction Management - [Short note: Building code and its use](https://www.bctengineer.com/question.md?key=semester_8%2Fconstruction_management%3Abuilding-code-note) — Construction Management, chapter 11, asked 6× - [Regulatory requirements and building codes for planning](https://www.bctengineer.com/question.md?key=semester_8%2Fconstruction_management%3Aregulatory-building-codes-urban) — Construction Management, chapter 11, asked 2× - [Client planning in implementation stage](https://www.bctengineer.com/question.md?key=semester_8%2Fconstruction_management%3Aclient-implementation-planning) — Construction Management, chapter 2 - [Motivation: Maslow's hierarchy and Herzberg's theory](https://www.bctengineer.com/question.md?key=semester_8%2Fconstruction_management%3Amotivation-maslow-herzberg) — Construction Management, chapter 10 - [Capitalized value of 80-year building](https://www.bctengineer.com/question.md?key=semester_8%2Fconstruction_management%3Avalue-building-80-years-2078) — Construction Management, chapter 13 - [Value of a 20-year-old building](https://www.bctengineer.com/question.md?key=semester_8%2Fconstruction_management%3Avalue-building-20-years-2075) — Construction Management, chapter 13, asked 2× ## Related in other subjects - [Status of irrigation development in Nepal](https://www.bctengineer.com/question.md?key=semester_6%2Firrigation_and_drainage_engineering%3Airrigation-status-nepal) — Irrigation and Drainage Engineering, chapter 1, asked 4× - [Mechanical ventilation and building code](https://www.bctengineer.com/question.md?key=semester_6%2Fbuilding_technology%3Avent-mech-conditions-nbc) — Building Technology, chapter 1 - [Marina class diagram implementation code](https://www.bctengineer.com/question.md?key=semester_6%2Fobject_oriented_analysis_and_design%3Amarina-class-diagram-implementation-code) — Object Oriented Analysis and Design, chapter 4 - [Sub-heads of items of work (building)](https://www.bctengineer.com/question.md?key=semester_7%2Festimating_and_costing%3Asubheads-items-of-work-building) — Estimating and Costing, chapter 2, asked 2×