Building use, structural design, site conditions, local building codes, transportation, and installation requirements all affect whether a solution is suitable for a project. Evaluating these factors early can help reduce design changes, construction delays, and additional costs.
Start by defining the building's intended use, floor area, number of stories, occupancy requirements, and expected service period. Residential buildings, offices, and construction site facilities have different requirements for space planning, insulation, fire safety, and building services. The configuration should reflect the actual needs of the project.
The delivery method also matters. Modular buildings are generally transported as relatively complete volumetric units, while component-based prefabricated buildings are assembled on-site from separately manufactured components. These approaches differ in transportation dimensions, lifting requirements, connections, and site installation procedures.
If future expansion or relocation is possible, check the structural connections and provisions for additional units in advance. Not all prefabricated buildings are designed for disassembly or relocation; this depends on their specific structural design and connection methods.
The building structure must comply with the design requirements applicable to its location. During selection, verify whether the design accounts for wind loads, snow loads, seismic forces, and dead loads. The main frame, walls, roof, connection details, and anchoring system should also be compatible.
Prefabricated components may experience different forces during transportation, lifting, and installation than they do during normal use. Lifting points, temporary supports, and installation sequences should therefore be addressed in the relevant design or construction plans.
Foundation design should account for soil conditions, building loads, site elevation differences, and drainage. Geotechnical investigations or engineering assessments may be necessary when soil-bearing capacity is uncertain, or site conditions are complex.
The connection between the foundation and the building should also be checked, including anchor locations, elevations, and allowable tolerances. Foundation design must be coordinated with the building's structural design to prevent installation problems caused by mismatched dimensions or connection positions.
Walls and roofs affect insulation, waterproofing, moisture control, and indoor conditions. When evaluating a prefabricated building, consider the local climate, intended use, and applicable building requirements. Key factors include:
◆Thermal performance: Check the overall thermal performance of the wall and roof assemblies rather than relying solely on insulation material names or thickness.
◆Air and water tightness: Review the sealing details at panel joints, window and door openings, roof connections, and service penetrations.
◆Moisture and condensation control: Evaluate vapor control measures, thermal bridges, and the risk of condensation within wall and roof assemblies.
◆Fire safety: Review relevant material performance documentation and verify that the complete assembly meets applicable fire safety requirements.
The performance of an individual material does not necessarily represent the performance of the entire building envelope. Material combinations, connection details, and installation quality also matter.
Prefabricated buildings must comply with the building regulations and approval requirements applicable to their project locations. Before procurement, confirm local building codes, zoning requirements, and permit procedures, as well as applicable requirements for structural safety, fire protection, energy efficiency, and accessibility.
It is also important to clarify which drawings, inspection records, and technical documents are required for factory production and on-site construction. Supplier product information does not necessarily replace the complete design documents or approval materials required for a specific project.
Transportation and installation conditions should be checked before ordering. For modular buildings, review module dimensions, weight, transportation routes, unloading space, and lifting conditions. For component-based buildings, check component identification, connection details, assembly sequences, and installation tolerances.
The responsibilities for foundation work, structural installation, electrical systems, plumbing, and HVAC should also be clearly defined to avoid problems with site connections and unclear work boundaries.
Supplier quotations may cover different materials, configurations, and delivery scopes. Therefore, the price of the building structure alone does not reflect the total project cost. Establish consistent technical specifications and a supply list before comparing quotations.
For example, one quotation may cover only the main building structure, while another includes insulation, windows, doors, and some interior components. Their initial prices cannot be compared directly to determine which option is more economical.
Before selecting a supplier, verify the following:
✓Building use, floor area, layout, and technical requirements are clearly defined.
✓Structural design meets the applicable requirements for the project location.
✓Connections between the foundation, main structure, and building envelope are coordinated.
✓Material specifications, construction details, and relevant compliance documents are available for review.
✓Responsibilities for transportation, lifting, installation, and building service connections are clearly assigned.
✓Quotation scope, acceptance criteria, and change procedures are clearly defined.
▸ Choosing a prefabricated building involves more than comparing initial prices. The structural design must suit the intended application, site conditions must support installation, and the supplier's delivery scope must match project requirements. Reviewing these factors before procurement provides a more reliable basis for comparing the suitability and total cost of different solutions.
