Engineering Cost Standard System Framework and Hierarchy
The engineering cost standard system consists of six levels: laws, administrative regulations, departmental rules, national standards, industry standards, and association standards. GB 50500 "Code of Bills of Quantities and Valuation for Construction Works" is the core valuation standard, unifying the bill preparation method, item coding rules, and quantity calculation rules. GB/T 51262 "Standard for Terminology of Construction Project Cost Management" unifies terminology definitions for cost management. Hotel group enterprise standards such as Marriott MIDS have explicit provisions on the configuration level of each system, directly determining the cost baseline. For example, MIDS requires that the air-conditioning system of a five-star hotel must adopt a four-pipe system, with the corresponding cost approximately 30%-40% higher than a two-pipe system.
Application of GB 50500 Bill of Quantities Valuation Code
The application of GB 50500 in MEP engineering runs through the entire process of bill of quantities preparation, tender control price preparation, bid pricing, contract price adjustment, and completion settlement. MEP engineering involves the measurement rules of specialized works in Appendix J (ventilation and air conditioning), Appendix K (electrical equipment installation), Appendix L (intelligent building systems), etc. Each appendix provides detailed provisions on item names, item features, measurement units, and quantity calculation rules. For example, in Appendix J, the measurement unit for centrifugal chillers is "unit," and the item features must describe cooling capacity, refrigerant type, COP value, etc.
Correspondence Between Design Standards and Cost Indicators
The choice of design standards directly determines MEP engineering cost indicators. The comprehensive MEP engineering cost indicator for a five-star hotel is generally RMB 3,500-5,000 per square meter, of which HVAC is approximately RMB 1,200-1,800/m2, electrical approximately RMB 900-1,400/m2, and plumbing and drainage approximately RMB 500-800/m2. Different design standards correspond to different costs: a four-pipe system increases cost by approximately 30%-40% compared with a two-pipe system; a VAV system increases cost by approximately 25%-35% compared with fan coil units; dual power supply + diesel generator increases cost by approximately 40%-50% compared with a single power supply. For design standard selection, differentiated standards with high cost-effectiveness should be prioritized.
Impact of Marriott MIDS MEP Standards on Cost
The Marriott MIDS standard has explicit requirements for different brand tiers. The MEP cost of Ritz-Carlton can reach RMB 5,000-6,000/m2; the Marriott standard is approximately RMB 3,500-4,500/m2; the Courtyard standard is approximately RMB 2,500-3,500/m2. In MIDS, mandatory clauses expressed as "Shall" must be strictly implemented, while recommended clauses expressed as "Should" may be adjusted according to project conditions. The design team should accurately distinguish mandatory from recommended clauses and, on the premise of satisfying mandatory requirements, achieve cost optimization through flexible application of recommended clauses.