Guide, multiplex design
Which multiplex fits your lot, and what shape it can take.
Before cost or financing, a multiplex project starts with a lot-specific question: how many units the site supports, whether it meets the access and eligibility checks a permit requires, and what building envelope the zoning bylaw actually allows. This guide walks through all three, in the order a feasibility review tests them.
Written by Trent Praski. Figures re-verified 2026-09-20.
306 to 557 m²
Vancouver R1-1 site area range, 3 to 6 units
10.0 to 15.1 m
Vancouver R1-1 frontage range, 3 to 6 units
0.70 to 1.00
Vancouver R1-1 floor space ratio, base to bonused
45 minutes
Minimum fire-resistance rating between adjoining units, BC Building Code
Key takeaways
- Unit count is decided by site area and site frontage together, not by preference, and both numbers must be met at once.
- A standard 33-foot Vancouver lot supports a triplex or fourplex; reaching 5 or 6 units needs 13.4 m or 15.1 m of frontage respectively.
- Rear lane access, a minimum 33-foot frontage, and confirmation the lot is outside a floodplain and free of heritage designation come before design begins.
- Setbacks, height, and floor area ratio apply simultaneously, and the design that survives all three is what actually gets permitted.
Three questions, answered in order
A feasibility review does not start with a floor plan. It starts by testing a lot against three separate questions: what unit count the site's area and frontage support, whether the lot passes the access and eligibility checks a standard multiplex permit requires, and what building envelope the zoning bylaw's setback, height, and floor-area rules actually allow.
Skipping ahead to design before answering these in order is the most common way a homeowner's early sketch turns out to be larger, or smaller, than what the lot can legally carry. The three chapters below take each question in turn.
Chapters in this guide
Unit types
Triplex, fourplex, or sixplex: which multiplex type fits your lot
What decides your unit count, and why it usually is not a choice.
ReadLot requirements
What your lot needs before a multiplex is possible
Access, width, and flood status, the checks that come before design.
ReadSetbacks and FSR
Setbacks, height, and floor area: the building envelope explained
The three-dimensional box every multiplex has to fit inside.
ReadFrequently asked questions
What is the first thing to check before designing a multiplex?
The first check is whether the lot's site area and frontage meet Vancouver's R1-1 thresholds for the unit count being considered. A standard 33-foot lot clears the 3 to 4-unit band but not the 13.4 m or 15.1 m frontage needed for 5 or 6 units. Confirming this before any design work begins avoids paying for drawings the lot cannot support.
Why does this guide separate design from cost?
Unit type, lot eligibility, and the building envelope are questions about what a lot can legally carry, independent of what it costs to build. Venture Pacific's separate multiplex cost guide covers hard costs, soft costs, city fees, financing, and land value once the design question here is settled.
Does every Metro Vancouver city use the same rules?
No. Vancouver's R1-1 zone, Burnaby's R1 small-scale district, and Richmond's RSM zones each set their own site area, frontage, setback, and height figures on top of the same provincial Small-Scale Multi-Unit Housing minimums. A number correct for one city cannot be assumed to apply in another.
Can I know my exact unit count without a feasibility review?
A registered subdivision plan and the tables in this guide give a close estimate, but a feasibility review confirms the surveyed frontage, checks floodplain and heritage status, and draws the actual building envelope against the specific lot. That confirmation is what a bank, a partner, or a permit application will rely on, not an estimate from a listing.
What disqualifies a lot from a standard multiplex permit?
A frontage narrower than 33 feet (about 10.0 metres), a location within a mapped floodplain, or a formal heritage designation each independently rule out the standard path, regardless of the lot's total area. These are checked first, before unit type or building envelope become live questions.
How much does the floor space ratio actually change what I can build?
Substantially. On a 4,000 square foot Vancouver lot, the base 0.70 FSR permits about 2,800 square feet of total floor area, while the bonused 1.00 FSR permits about 4,000 square feet, a difference of over 1,200 square feet on the identical lot depending on whether the project is secured rental or includes a below-market unit.
Does a corner lot change any of these calculations?
Corner lots have two street frontages, but the frontage tested against the R1-1 schedule follows the zoning bylaw's own definition, not automatically the longer of the two sides. Corner lot frontage and its parking arrangement should be confirmed against that specific bylaw language rather than assumed from the general mid-block rule.
What happens if my lot fails one of these checks?
A lot that falls short on frontage, area, or eligibility is not necessarily unbuildable, but it may need lot assembly with a neighbour, a different unit count than originally planned, or in the case of floodplain or heritage status, a different process entirely. A feasibility review identifies which of these applies before any design cost is committed.
Related reading from the Journal
Sources and references
Rate and regulation figures on this page were re-verified on 2026-09-20. Construction cost ranges come from Venture Pacific's own Metro Vancouver projects and are described as such wherever they appear.
- Zoning and Development By-law, R1-1 District ScheduleCity of Vancouver. Accessed 20 September 2026.
- Housing options in low density areas (R1-1)City of Vancouver. Accessed 20 September 2026.
- Build a multiplexCity of Vancouver. Accessed 20 September 2026.
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