Modular, Manufactured, RTM: What Those Words Actually Mean in Alberta

Walk onto any dealer's lot in Alberta and you'll hear four different words for what looks like the same thing: modular, manufactured, mobile, RTM. Salespeople mix them up. Websites mix them up. Honestly, plenty of people in the industry mix them up too. But the words have real meanings, and a couple of them matter a great deal when it comes to financing, insurance, and what you're allowed to put on your land.

After 65 plus years of selling factory-built homes, here's the plain-language version we give our customers.

A modular home is built in sections inside a factory, then delivered and assembled on your foundation. The word describes how the home is built, not what it looks like. Modern modular homes are single-family homes, bungalows, even two-storey designs, and once they're on a foundation you'd have to be told to know the difference.

Here's the part that matters: modular homes in Alberta are built to the same Alberta Building Code as any site-built house, and they carry a certification called CSA A277. That label means independent inspectors checked the home at every stage of construction in the factory. Your local building inspector only needs to inspect what happens on site, like the foundation and utility hookups. Lenders treat A277 modular homes on permanent foundations like any other house. Standard mortgage, standard appraisal, standard resale.

Casually, people say "manufactured home" to mean anything built in a factory. Technically, a manufactured home is built to a different standard called CSA Z240 MH, usually single-storey on a steel chassis, designed for surface foundations.

And here's the thing most buyers don't know: new homes built to the Z240 MH standard are generally not permitted in Alberta unless a municipality specifically allows them. Existing ones can be moved at a municipality's discretion, but if you're buying new in this province, you're buying a home built to the Alberta Building Code. Every home on our lots is CSA A277 certified. If a seller can't show you the certification label, ask why.

RTM stands for ready to move. It isn't a building code category at all. It's the industry's word for a home that's built completely in the factory and delivered to your site in one piece, rather than in sections. RTMs are typically the biggest factory-built homes, placed on basements or crawlspaces, and they're a favourite for acreages and farmyards.

So an RTM is a modular home. Same code, same certification, same financing. The difference is that it arrives whole. If you want the full picture, we wrote about it on our RTM homes page.

"Mobile home" properly refers to homes built before the modern standards existed, or it gets used loosely for older Z240 homes in communities. What it is not: a modern modular home. If someone dismisses factory-built housing as "a trailer," they're working off information that expired decades ago. Today's factory-built homes are engineered, inspected, and warrantied to a level a lot of site builds would envy.

Partly because it affects your wallet: the certification on the home determines your financing options, your insurance, and your resale market. And partly because our team sits on the board of the Modular Housing Association of the Prairie Provinces, so we'd embarrass ourselves getting it wrong.

If you're not sure what a home you're looking at actually is, whether it's ours or anyone else's, bring us the serial number or the spec sheet and we'll tell you straight. That's free, and so is our advice.