What Is a Prefab Multiplex? A Simple Guide for BC Families

If you have looked into building a home for your family in Greater Vancouver, you have probably seen the words "prefab" and "modular." They sound technical, but the idea is simple. This guide explains what a prefab multiplex is, how it works, and why so many BC families are choosing one to live together on a single lot.

What "prefab multiplex" actually means

Let us break the two words apart.

A multiplex is a small building with more than one home on one lot. A duplex has two homes, a triplex has three, and a fourplex has four. Each home is private and self-contained, with its own front door, kitchen, and bathrooms.

Prefab is short for prefabricated. It means the home is built mostly in a factory before it reaches your lot, instead of being built piece by piece outdoors. The finished parts are trucked to your land and put together there.

Put them together and a prefab multiplex is a duplex, triplex, or fourplex where most of the building happens in a factory. For a fuller overview, see our main guide to the prefab multiplex.

How a prefab multiplex is built

The exact steps depend on the method, but the shape of the project is the same:

• You settle the design and get a building permit.
• The factory builds your home while your lot is prepared at the same time.
• The finished parts are delivered and set on the foundation, often in a day or two.
• A crew connects everything, finishes the joins, and completes the site work.
• After a final inspection, the homes are ready to move into.

The big idea is that two slow steps, preparing the site and building the home, happen at the same time instead of one after the other. That is why prefab is faster. We walk through the whole schedule in how long a prefab multiplex takes to build.

The main types of prefab

There is more than one way to build off-site:

• Modular: whole rooms are built as finished boxes and joined on your lot. The fastest option.
• Panelized: flat wall, floor, and roof panels are made in the factory and assembled on site. More design freedom.
• Kit or hybrid: some parts are made in the factory and the rest is built on site.

We compare all three in the prefab options explained.

Why BC families choose a prefab multiplex

The appeal is not really about the factory. It is about what a multiplex lets a family do.

In Greater Vancouver, land is the biggest cost of any home. Putting two, three, or four family homes on one lot means each home carries a smaller share of that land cost. Parents can live in one home and their grown children in another, close by but with their own front doors. An owner can live in one home and rent the others for income.

BC has also made this easier. Under the province's small-scale housing rules, often called Bill 44, many single-family lots can now hold three to six homes (Source: Government of BC, small-scale multi-unit housing legislation). That opened the door to multiplexes on lots that used to allow only one house.

Is a prefab multiplex lower quality?

No. In Canada, a factory-built home is made to the same building code as any other home, and it is inspected during production. Because the work happens indoors on level surfaces, the quality can be more consistent than a home framed outdoors in the rain. Once it is finished on your lot, a prefab multiplex looks like any other modern duplex or fourplex on the street.

What this comes down to

• A prefab multiplex is a duplex, triplex, or fourplex built mostly in a factory, then finished on your lot.
• It is usually faster and more predictable than a traditional build, because the factory works while your site is prepared.
• Families choose it to put more than one home on one lot and share the land cost.
• It is built to the same code as any other home, so it is not lower quality.

If you are weighing a prefab multiplex for your family, we can help you understand your options and match you with a vetted BC builder. Tell us about your plan on our contact page, or browse finished multiplex homes for sale on our properties page.

Frequently asked questions

What is the difference between prefab and modular?

Prefab is the umbrella term for any home built partly in a factory. Modular is one type of prefab, where whole rooms are built as finished boxes. So every modular home is prefab, but not every prefab home is modular.

Can you build a prefab multiplex in Vancouver?

Yes. Prefab methods are allowed the same as any other build, and BC rules now allow several homes on many single-family lots. The number of homes depends on your lot's size and location, which a builder confirms early.

How many homes can a prefab multiplex have?

Most families build a duplex (two homes), triplex (three), or fourplex (four). BC rules allow up to six homes on many lots, and more in some parts of Vancouver, depending on the lot.

Is a prefab multiplex cheaper than a normal build?

It can be, but the bigger saving is usually time, not money. Land, design, and finishes cost the same either way. See our prefab multiplex cost guide for real ranges.

How long does a prefab multiplex take?

The factory stage is quick, often a few weeks, but the full project takes many months once you include design, permits, and site work. Prefab mainly shortens the building stage.

Does a prefab multiplex look different from other homes?

No. Once finished, it looks like any modern multiplex. You still choose the cladding, windows, and finishes. Most people cannot tell it was built off-site.

Who is a prefab multiplex good for?

Families who own or plan to buy a lot and want more than one home on it. That includes parents and grown children who want to live close, or an owner who wants a home plus rental income.

Do I need my own lot?

To build a prefab multiplex, yes, you need a lot. If you would rather buy a finished multiplex home instead of building, we can help with that through our listings.

Is financing different for prefab?

The main difference is that the factory stage has to be funded. In 2026, CMHC expanded its insurance to support modular multi-unit building, which made this easier (Source: CMHC, 2026). See financing a prefab multiplex.

How do I get started?

Tell us about your family, your lot, and how many homes you want. We will match you with prefab builders in BC who fit your plan, at no cost. Start on our contact page.