Fourplex Cost and Zoning Rules in Vancouver (2026)
A fourplex in BC is a Part 9 residential building under the BC Building Code, and most standard Vancouver lots can support one under R1-1 zoning and SSMUH. Total project cost runs $3.0M to $5.2M all-in. Here is how the classification, lot rules, and unit count differ from a triplex.
Fourplex at a glance
Building code path
Part 9
Same prescriptive path as a house, duplex, or triplex, up to 3 storeys
Total project cost
$3.0M – $5.2M
All-in, including land, construction, fees, and soft costs
Typical minimum lot size
~280 m²
A standard 33×122-ft Vancouver lot; exact tier depends on address
For the full construction cost breakdown by line item, see the fourplex cost guide.
What makes a fourplex a fourplex, legally
A fourplex is a residential building with exactly four self-contained dwelling units on one lot. The same two rules that govern a triplex apply, scaled up by one unit:
- BC Building Code classification: A fourplex still qualifies as a Part 9 building, capped at three storeys and 600 square metres per unit. It does not trigger the commercial-grade Part 3 path, which applies at a higher unit or height threshold.
- Provincial and municipal zoning: BC's SSMUH legislation sets three to four units as the baseline for qualifying lots, and Vancouver implements this through R1-1 zoning. A lot's exact SSMUH tier, driven by lot area and frontage, decides whether it caps at three units or clears the bar for four.
In practice, a fourplex is the largest unit count most Vancouver single-family lots reach before requiring a rezoning application or a larger apartment-zone designation.
Triplex vs fourplex: what actually changes
| Factor | Triplex (3 units) | Fourplex (4 units) |
|---|---|---|
| Building code path | Part 9 | Part 9 |
| Total project cost (Vancouver) | $1.0M–$1.7M (construction only) | $3.0M–$5.2M (all-in, including land) |
| Typical minimum lot size | Smaller lots often qualify | ~280 m² / 33×122 ft standard lot |
| Parking requirement | Scales with unit count; may be waived near transit | Higher than triplex on a comparable lot; same transit waiver applies |
See the full duplex vs triplex vs fourplex comparison for how a duplex fits into this same decision.
Frequently asked questions
What building code classification does a fourplex fall under in BC?
A fourplex in BC is classified as a Part 9 residential building under the BC Building Code, the same prescriptive path used for a house, duplex, or triplex, capped at three storeys and 600 square metres per unit. This keeps a fourplex out of the Part 3 commercial building path, which applies once a building passes a higher unit or height threshold, most commonly at five or more units.
Can I build a fourplex on my lot in Vancouver?
A fourplex is achievable on most standard Vancouver lots (roughly 280 square metres or larger) under R1-1 zoning, though the exact unit count a specific lot supports depends on lot area, frontage, and the SSMUH tier it falls into. Provincial SSMUH legislation sets three to four units as the baseline most single-family lots must allow; a lot that clears the size threshold for four units can build a fourplex rather than stopping at a triplex.
How much does it cost to build a fourplex in Vancouver?
A fourplex in Metro Vancouver costs $3.0 million to $5.2 million all-in, including land, construction, city fees, and soft costs, depending on neighbourhood. The construction portion alone runs roughly $2.3 million to $2.6 million for a standard 4-unit wood-frame build at $400 to $450 per square foot. See the full fourplex cost breakdown for the line-by-line figures.
What is the difference between a triplex and a fourplex under BC zoning?
The difference is one unit, but that unit changes the lot size, parking, and servicing requirements the project must meet. Both fall under the same Part 9 building code path and the same SSMUH/R1-1 zoning framework, so a lot that qualifies for a fourplex almost always qualifies for a triplex, but the reverse is not guaranteed on a smaller lot.
What is the minimum lot size for a fourplex in Vancouver?
Vancouver ties fourplex eligibility to lot area and frontage under its SSMUH tiers rather than setting one fixed minimum. A standard 33-foot by 122-foot lot (about 4,000 square feet) typically supports four units, while smaller or irregular lots may cap out at three. A site-specific zoning check against the exact address is the only reliable way to confirm which tier a given lot falls into.
Does a fourplex need more parking than a triplex in Vancouver?
Parking requirements scale with unit count under Vancouver's multiplex parking rules, so a fourplex typically needs more stalls than a triplex on a comparable lot, though many multiplex zones near frequent transit have reduced or eliminated minimum parking requirements entirely. The exact requirement depends on the lot's specific zoning designation and its distance from a qualifying transit corridor.
How long does fourplex construction take in Vancouver?
Plan for 18 to 26 months from permit application to occupancy for a Vancouver fourplex. The development permit stage runs 8 to 16 weeks, the building permit adds 6 to 10 weeks after that, and construction itself runs 10 to 14 months depending on weather and trades availability.
Can I finance a fourplex with the same rules as a house?
If you plan to live in one of the four units, CMHC insures owner-occupied one-to-four-unit buildings with as little as 5% down on the first $500,000 of purchase price, 10% on the portion from $500,001 to $999,999, and 20% at or above $1 million. CMHC-insured financing is not available above a $999,999 purchase price, which puts most Metro Vancouver fourplexes into the 20%-down category in practice. See the CMHC multiplex financing guide for the full breakdown.
Check what your lot allows
Enter your address to see your lot's zoning, eligible unit count, and a site-specific fourplex proforma.