Panelized construction: developer's guide
Panelized construction builds wall, floor and roof panels in a factory and assembles them on site. Developers should check panel scope, shipping, crane needs and who finishes the joints.
Panelized construction means the walls, floors and sometimes roofs are manufactured as flat panels in a factory, shipped to the site and assembled there. It sits between stick-built, where everything is made on site, and volumetric modular, where whole rooms arrive as boxes. For developers, the key work is deciding the panel boundary: what is made in the factory and what is finished on site.
Open versus closed panels
| Type | Typically includes | Typically finished on site |
|---|---|---|
| Open panel | Structural frame, sometimes sheathing | Insulation, membranes, services, linings, cladding |
| Closed panel | Frame, sheathing, insulation, sometimes windows and internal services | Joints, linings, cladding, final services connections |
Those definitions vary between suppliers and regions. Ask each supplier to list the layers in their panel in order, from inside to outside, so you can compare them fairly.
Frame materials
Panels can be made from timber, steel, concrete or combined systems. Where the frame is cold-formed steel, see the steel framing overview and the component guide. The material affects weight, fire behavior, corrosion considerations and how the engineer designs connections.
What panelization changes in the process
- Design must settle earlier. Factory production works from a fixed set of drawings. Late changes cost more than on site. See design freeze.
- Coordination gets earlier. Services penetrations, openings and fixings are planned before cutting.
- Site works run in parallel. Foundations can proceed while panels are made, if tolerances are agreed. See foundation interfaces.
- Transport and lifting need planning. Panel size and weight are limited by trucks and roads, and by the handling method.
How much time this saves, if any, depends on the project and must come from supplier-stated schedules, not general claims.
Scope boundary questions
- Who produces panel drawings, and who checks them against the architecture and engineering?
- Are windows and doors fitted in the factory or on site?
- Who seals the joints between panels, and who warrants the result?
- Who supplies fixings, temporary bracing and lifting accessories?
- Who installs the panels: supplier crew or your contractor?
- Who is responsible for damage in transit and during erection?
The prefab quote exclusions guide adds more items to this list.
Logistics
Panels are flat and relatively easy to stack, but bulky and fragile at edges and openings. Ask about packing, order of delivery and on-site storage so the first panels needed are not buried under the last. Use a logistics plan and the receiving checklist. For imported panels, remember that customs, port handling and onward trucking add steps.
Engineering and approvals
Panel systems still need engineered structural design, and local authorities may have rules on factory-built components and inspection. Whether a given system is acceptable at your site is a question for the engineer of record and the local authority, not the supplier alone. Ask for the supplier's design basis and any third-party documentation, and give them to your engineer.
Where panelized fits
Panelized suits designs with repeating wall and floor modules, where factory repeatability matters and transport limits are manageable. It may suit phased projects (see phased development). It may suit poorly where design changes continuously or access cannot carry the loads. For a three-dimensional alternative read the volumetric modular guide, and for vocabulary the prefab terminology guide.
Decision checklist
- Is the design stable enough for factory production?
- Can panels reach the site and be lifted safely?
- Is the scope boundary written and priced consistently?
- Has the engineer of record reviewed the supplier design basis?
- Are the interfaces to foundations, services and envelope assigned?
Questions people ask
How is panelized different from modular?
Panelized units are flat panels assembled into a building on site. Modular units are three-dimensional boxes, often largely finished, shipped and set in place.
Are panels open or closed?
Both exist. Open panels are framing only; closed panels include sheathing, insulation, and sometimes windows and cladding. Ask exactly what is in each.
Do panelized projects need a crane?
Often some lifting equipment is needed, depending on panel size and weight. Confirm with the supplier and the installer.
Can panels be used for any design?
Not always. Design needs to suit panel sizes and transport limits. Confirm early with the supplier and engineer of record.
Sources and further reading
Have a project outline or drawings?
Organize your scope, then contact Digital Oro through its official channel. Availability, engineering, pricing and delivery terms need project-specific confirmation.
Explore Digital Oro →Digital Oro International advertises on The Company Chronicle. This guide was written by our editorial team from public sources and general professional practice; it does not describe a guarantee, quote or offer from Digital Oro International. Confirm current terms, prices and availability with the operator before you decide.