Zoning says you can.
Does the lot pencil?

The R1 SSMUH rules tell you how many units Burnaby will allow on your lot. They say nothing about whether building those units is a good idea. That second question — feasibility — is where most owner expectations and most builder offers part ways. A builder is solving a math problem: can they fit a workable plan, finance it at today's rates, carry it through an 18–24 month build, and sell the finished units for enough to justify the risk? When the answer is no, the zoning permission is worth very little, and the lot trades closer to a traditional detached value.

This guide is the read I walk Burnaby owners through before any listing or build decision. It is deliberately number-light: the cost of your project depends on your site, and a generic per-square-foot figure does more harm than good. What holds across every lot are the factors that decide whether the math has a chance.

The six site factors that decide it

Before financing ever enters the picture, the physical lot either supports the permitted density or it does not. These are the traits I check first.

Soil deserves a flag of its own. Large parts of Burnaby sit on soft, compressible ground, and a multiplex is heavier than the bungalow it replaces — which can push you into engineered-pile foundations that a single owner-occupier might have avoided. Read the peat bog & soft soils guide before you underwrite a lot near Burnaby Lake, Still Creek, or the Big Bend flats.

What actually drives the cost

I will not put a per-square-foot number on this page, because the honest answer is "it depends on your lot" — and a wrong number is worse than none. What I can tell you is where the money goes, so you know which questions change the budget most.

For verified, current construction cost figures specific to your site, I work from builder estimates in my network rather than published averages — they are the only numbers worth underwriting against.

The financing detail most owners miss

Here is a feasibility lever that quietly favours the six-unit tier. CMHC's MLI Select multi-unit mortgage loan insurance can unlock reduced premiums and longer amortization — up to 50 years at the highest point thresholds — based on a project's affordability, energy efficiency, and accessibility scores. It is a meaningful advantage for a rental hold. But it carries a hard floor: a minimum of five units. A three- or four-unit multiplex simply does not qualify.

That is why the jump to six units is not only about one or two more saleable homes. On a lot that clears the 400-metre transit threshold, crossing five units can change the financing structure of the whole project, not just its revenue. Below five units, you are in conventional construction and residential financing territory. It is exactly the kind of detail that decides whether a lot is worth holding for a build or selling now.

The four paths, briefly

Once you know whether the lot pencils, the decision narrows to four. I model all of them on the multiplex advisory page:

• 01.Sell as-is — immediate liquidity at current market value, no build risk.
• 02.Sell to a builder — capture a development-site premium, when the lot is strong enough to command one.
• 03.Build it yourself — most total value, most capital and risk, a 2–3 year commitment.
• 04.Co-develop — share capital risk and upside with a builder partner; the deal structure is everything.

This guide is general information as of June 2026 and is not financial, construction, or planning advice. Feasibility is site-specific and depends on current costs, rates, and bylaw rules, all of which change. Always confirm with qualified professionals and the City of Burnaby before relying on any of the above for a purchase or build decision.