The short version: "mobile home" gets used loosely to describe three genuinely different things — a manufactured home built to its own stand-alone factory code, a modular home built in a factory to the full BC Building Code, and a conventional stick-built home constructed on-site. The difference isn't cosmetic — it affects financing, insurance, resale value, and what a municipality or First Nation will let you do with the home.
CSA Z240: the manufactured home standard
Manufactured homes built since roughly 1972 are constructed to CSA Z240MH, a stand-alone building code specific to factory-built homes on a steel chassis/frame — not tied to or recognized within the BC Building Code. It's a detailed code in its own right, running to roughly 100 pages covering everything from welding practices on the steel frame to electrical connection types, and homes built to it go through third-party inspection. CSA Z240 confirms the home is designed and built correctly to that specific standard — it's a genuine, legitimate construction code, just a different one from what applies to a conventional house.
CSA A277: the modular home standard
CSA A277 is different in kind, not just degree — it isn't itself a building code. It's a certification procedure confirming that a factory's construction process was properly inspected and that the resulting components comply with the current BC Building Code (or another applicable code) the home is actually built to meet. A home certified under A277 is effectively built in a factory to the same code a site-built house would need to meet, then transported and assembled on a foundation. Because of this, A277 homes are generally recognized by municipal building authorities in a way Z240 homes are not — Z240 sits outside the authority having jurisdiction's direct purview.
Why the distinction actually matters to you
- Financing: some lenders treat A277 modular homes more like conventional real property, particularly when placed on a permanent foundation on owned land — potentially opening up more conventional mortgage options than a Z240 home typically gets. See our financing guide.
- Insurance: insurers sometimes price or underwrite differently based on the construction standard and foundation type.
- Placement and permitting: because A277 certifies BC Building Code compliance, it's generally the standard required for a factory-built home to be placed as a permanent dwelling on most freehold residential lots. Z240 manufactured homes are generally intended for manufactured home parks specifically.
- Resale and perception: a stick-built or A277 modular home on a foundation is often perceived — rightly or not — as closer to a "normal" house than a Z240 manufactured home on a steel frame, which can affect resale.
How to tell which one you're looking at
Every factory-built home has a compliance plate — usually located near the electrical panel or in a closet — stating which CSA standard it was built to, along with a serial/registration number. This is the authoritative way to confirm what you actually have; don't rely on a listing description alone, since "manufactured home," "modular home," and "mobile home" are often used loosely and interchangeably by sellers and even some agents.
This page describes general construction-standard distinctions in BC and is not a substitute for a professional inspection or review of a specific home's compliance plate and documentation.
This page provides general information only and is not legal, financial, or tax advice. Rules, rates, and lender policies change — please confirm current details with a lawyer, notary, or mortgage professional before relying on this page.