Panelized 2D modular systems deliver factory-fabricated wall, floor, and roof panels as flat-packed assemblies. Shipping efficiency is maximised — up to 3x more building area per truck versus volumetric modules — while still capturing 40–60% of construction value in the controlled factory environment.
Factory-built panels with site assembly. All load-bearing elements engineered to Eurocodes. Cladding, windows, and services coordination pre-planned at BIM level.
| Parameter | Specification | Standard / Notes |
|---|---|---|
| Frame Material | Cold-formed steel (S350GD+Z) or engineered timber (C24, GL24h) | EN 1993-1-3 / EN 1995-1-1 |
| Panel Types | External wall, party wall, floor cassette, roof cassette | Load-bearing and non-load-bearing |
| Factory Completion | 40–60% | Structure, sheathing, insulation, windows, door blanks |
| Site Assembly Rate | 80–120 m² of wall per crew per day | 4-person crew, crane-assisted for floor cassettes |
| Maximum Panel Dimensions | 3.0m × 12.0m (wall); 4.0m × 12.0m (floor) | Transport-limited; stacked on A-frames |
| Shipping Efficiency | Flat-packed: 3x building area per truck vs volumetric | Reduced transport cost per m², fewer deliveries |
| Acoustic — Airborne | DnT,w + Ctr ≥ 45 dB (party wall) | BS EN ISO 16283-1 |
| Acoustic — Impact | L'nT,w ≤ 62 dB (floor cassette) | BS EN ISO 16283-2, resilient layer |
| Fire Resistance | 60–120 minutes | BS EN 13501-2, Type IIA/IIB construction |
| Thermal Transmittance | U = 0.15–0.18 W/m²K | BS EN ISO 6946 |
| Building Height | Up to 6 storeys (timber); up to 12 storeys (steel) | Higher with hybrid structural frame |
| Typical Programme | 8–12 weeks factory + 6–14 weeks site | 14–24 weeks total; depends on cladding scope |
Panelized systems strike an optimal balance between factory quality control and on-site flexibility. Panels arrive pre-cut, pre-insulated, and pre-sheathed. Site crews erect the structural enclosure in days rather than weeks, then complete MEP first fix, plasterboard, and finishes using conventional techniques — but starting from a dimensionally perfect shell.
Flat-packed panels ship up to 3x the building area per truck compared to volumetric modules. For projects with long logistics distances or constrained site access, panelized systems dramatically reduce the transport cost per square metre — often the deciding factor for regional and remote projects.
Because MEP and finishes are completed on site, panelized projects accommodate design changes later in the programme than volumetric. Room layouts, service routes, and finish specifications can be adjusted after panels are erected — valuable for tenant-fit-out phases and speculative developments where the end user is not yet known.
Panelized systems combine seamlessly with volumetric modules in a hybrid approach. Use volumetric for kitchens, bathrooms, and plant rooms (wet, service-intensive spaces) and panelized for bedrooms, living areas, and corridors (dry, flexible spaces). One BIM model coordinates both systems — single-source design responsibility.
A trained 4-person crew erects 80–120 m² of external wall per day. A 4-storey, 2,000 m² building can be structurally enclosed and weather-tight in under 3 weeks. This compresses the programme's critical path, unlocks earlier MEP and finishes start dates, and reduces the site's exposure to weather risk during the most vulnerable construction phase.
Selecting the right system depends on project typology, site constraints, logistics, and budget priorities. This comparison is based on a 4-storey, 3,000 m² office building.
| Metric | Panelized (2D) | Volumetric (3D) | Traditional |
|---|---|---|---|
| Factory Completion | 40–60% | 80–95% | <5% |
| On-Site Labour (person-hours/m²) | 8–12 | 4–6 | 18–25 |
| Transport Cost (relative) | Low | High | N/A |
| Total Programme Duration | 14–24 weeks | 16–28 weeks | 36–52 weeks |
| Design Flexibility | High | Moderate | Very High |
| Weather Dependency | Moderate | Very Low | High |
| Quality Consistency | Good | Excellent | Variable |
| On-Site Crane Time | 2–4 weeks | 1–2 weeks | Continuous |
| Best Application | Offices, schools, low-rise residential, retail | Hotels, student housing, hospitals, high-rise residential | One-off bespoke, complex geometry |
| Capital Cost (relative to traditional) | 90–100% | 95–105% | 100% (baseline) |
Tell us about your project and we will assess whether panelized, volumetric, or a hybrid approach delivers the best value — with quantified cost, programme, and quality trade-offs for each option.
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