Modular vs site-built commercial construction
A modular commercial building is made indoors in a plant while the site is prepared, then delivered and set in days. A site-built one is built step by step on the lot. Modular is usually faster (Herauf builds take about 16 weeks to manufacture and deliver, up to 50% faster than conventional construction), is not exposed to weather during the build, and disrupts the site far less. Site-built is the better choice for very large spans, unusual shapes and tall buildings that modules cannot carry. Both are built to the National Building Code; factory-built buildings in Canada also follow CSA A277.
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| Topic | Modular | Site-built |
|---|---|---|
| Schedule | The building is made in a plant while the site is prepared, so the two run at the same time. Herauf builds typically take about 16 weeks to manufacture and deliver, up to 50% faster than conventional construction. | Site work, foundation, framing, envelope and fit-out happen one after another on the same lot, so each delay pushes everything after it. |
| Weather | Built indoors, so framing, insulation and finishes are never rained or snowed on. Winter only affects the foundation and the set. | Exposed to the weather until the envelope is closed. In Western Canada, winter often means heating, hoarding or waiting. |
| Quality control | The same crew, jigs and checks on every module, inspected in the plant before it ships. Insulation and airtightness are installed in a controlled setting. | Quality depends on each trade and site conditions on the day. Inspections happen on site at set stages. |
| Code and standard | In Canada, built to CSA A277 for factory construction and the National Building Code. Herauf buildings meet or exceed both. | Built to the National Building Code (or the provincial code) and inspected on site. |
| Site disruption | Most work happens off site. On site, the work shrinks to the foundation, the set and the tie-ins, measured in days, which matters next to a working school, clinic or store. | Months of trades, deliveries, noise and traffic on the site. |
| Remote and northern sites | A finished building arrives by truck or winter road, so the community does not need to house a full construction crew for months. | Every trade, material and piece of equipment has to reach the site and stay there for the whole build. |
| Relocation | Can be built on a steel skid and moved later, which suits camps, temporary programs and sites with a short lease. | Permanent. Moving it means demolishing it. |
| Design freedom | Sizes and spans follow the module, which is limited by what can travel on a highway. Most offices, clinics, daycares, classrooms, washrooms and housing fit well. | No transport limits, so very large open spans, unusual shapes and tall buildings are easier. |
| Cost drivers | Use, size and fit-out, foundation or skid, services, distance to site, and set. A shorter schedule cuts site overhead and lets the building earn or serve sooner. | The same drivers, plus longer site overhead, winter conditions and more exposure to trade availability. |
For what drives the price of a commercial modular building, see the cost and schedule guide. For the questions to ask a manufacturer, see how to choose a commercial modular manufacturer. For homes rather than commercial buildings, see modular vs RTM vs manufactured.
See it delivered.
Herauf has delivered washrooms, offices, classrooms, dormitories and housing across Western Canada, including over the winter road to northern communities. Each project is published with its location.
Common questions
Is modular construction faster than site-built construction?
Usually, yes. A modular building is made in a plant while the site is prepared, so the two run at the same time instead of one after the other. Herauf Modular builds typically take about 16 weeks to manufacture and deliver, up to 50% faster than conventional construction.
Is a modular commercial building as good as a site-built one?
It is built to the same National Building Code, plus CSA A277, the Canadian standard for factory-built buildings. Herauf buildings meet or exceed both and are designed for climate zones 6 to 8. Building indoors also means the framing and insulation are never exposed to weather.
When is site-built construction the better choice?
When the building needs very large open spans, an unusual shape or a height that modules cannot reach, or when a large site-built project is already under way and the modular part would be small. Modules are limited by what can travel on a highway.
Is modular cheaper than site-built?
It depends on the project. The building itself is priced on its use, size, fit-out and finishes, and the total depends on foundation, services, delivery and set. Modular cuts site overhead because the schedule is shorter. The cost guide explains each driver.
Can a modular building be moved later?
Yes, if it is built on a steel skid. A skid-mounted building sets down without a poured foundation and can be relocated, which suits workforce camps, temporary programs and sites with a short lease.