Duplex or a House With a Suite? Choosing on a Burnaby SSMUH Lot

A lot in Parkcrest or Capitol Hill that qualifies under the provincial small-scale multi-unit rules can hold more than one household. The question we get at the first meeting, almost every time, is which shape that should take: one custom home with a legal suite, or a duplex. Both are permitted on most Burnaby R1 lots. They are different buildings, on different titles, and they age differently.

What the lot allows

The Province requires municipalities to allow a minimum of three units on lots of 280 square metres or smaller and four units on larger lots in most urban single-family zones. Burnaby answered by folding every former residential R district into a single R1 district, and its new Zoning Bylaw took effect on July 1, 2026 with the R1 district carried forward.

The City's own summary of the R1 district lists the forms that work on one lot: a single-family home plus a secondary suite or laneway home, duplexes (two sets, or one set with secondary suites), multiplexes of three to six units, and cottage courts. Secondary suites count toward the unit total, only one is permitted per primary dwelling unit, and the summary states plainly that a suite must remain registered under the same title as the home it sits in and cannot be stratified. Primary dwelling units can be.

One Burnaby detail trips people up. The City's secondary suite page allows suites only in side-by-side or front-to-back duplexes, never stacked ones. So an up-down duplex is two units, full stop. A side-by-side duplex with a suite under each half is four.

Title decides the wall

Start with the question that decides everything else: how many owners will this building have in ten years?

A house with a suite is one real estate entity. The BC Building Code's definition of a secondary suite, quoted in the Province's Home Suite Home guide, ends with the phrase "where both dwelling units constitute a single real estate entity." One title, one mortgage, one owner. The suite is a room in your house that happens to have its own kitchen and door.

A duplex can be two real estate entities. Under the Strata Property Act, a strata plan divides the lot into strata lots and common property, and the two owners form a strata corporation with bylaws and a shared insurance policy. A two-lot strata is the smallest version of the same structure a 200-unit tower uses. It works, and it comes with paperwork the house-with-suite owner never sees.

The title choice reaches the warranty too. BC Housing's 2-5-10 home warranty page sets different coverage limits for a detached home and for a strata unit, and adds a separate coverage layer for common property in a strata building. Ask your lender the same question before drawings start, because a house with a mortgage helper and two strata lots are underwritten differently, and the difference can change which building you can afford to hold.

Decide who owns what first. The title question picks the wall, the meters, and the buyer.

Icon Projects Team

Fire separation between the units

This is where the two options stop looking alike on the framing plan.

Article 9.10.9.16 of the BC Building Code, reproduced in the Province's secondary suites code document, requires suites in residential occupancies to be separated by a fire separation rated at not less than 45 minutes. Where a dwelling unit spans two or more storeys including a basement, the separation from the rest of the building goes up to one hour. A side-by-side duplex where each half has a basement and two floors lands in that one-hour category. The party wall runs continuously from the footing to the underside of the roof sheathing, with rated assemblies on both faces and firestopping at every penetration.

A house with a secondary suite is treated as a lesser risk. The same article allows a 15-minute separation when every smoke alarm in the house is photo-electric and interconnected, a 30-minute separation when additional interconnected alarms are installed in each unit and the common spaces, 45 minutes when the alarms are not interconnected that way, and no rating at all if the house is sprinklered. The Home Suite Home guide adds that alarms in a suited house must be hardwired and, unless the house is sprinklered, interconnected so they sound in both units at once.

Our practice: we build the suite separation to the 30-minute assembly or better even when the alarm arrangement would allow 15, because the same insulation, resilient channel and gypsum that earn the rating also do most of the sound work, and because a future owner may change the alarms without changing the wall. On a duplex, the party wall gets designed as a system before the plumber and the electrician touch it. A single back-to-back outlet box or a duct run through a rated wall is a deficiency at inspection and a real hole in a fire.

Meters and services

BC Hydro's electrical connections page states that, effective April 1, it no longer provides master meter service to new multi-occupancy buildings or new residential units within them, with secondary suites excluded. Read that as: a new duplex gets a meter base and an account for each unit. A suite can stay on the house meter, or you can give it a second meter so a tenant pays their own bill, which the Home Suite Home guide suggests considering.

Water and sewer follow the same split. A stratified duplex is two properties with two utility accounts. A suited house is one account, and Burnaby charges supplementary utility fees for water and sewer once the suite is rented, with a declaration filed within 30 days of any change and a business licence required if the owner does not live on site.

Heating and hot water go the same way. Each duplex unit gets its own heat pump, its own ventilation, its own water heater, because a strata owner does not want to share a mechanical room. A suite often shares the house systems with a separate thermostat, and that is fine until the tenant and the owner disagree about the temperature. We plan a dedicated heat pump head and a separate ventilation path for the suite on most builds now, because the cost of doing it later is a ceiling.

Parking, doors and the path to the street

Burnaby's R1 summary requires, outside a Frequent Transit Network Area, one parking space for the first dwelling unit and half a space for each additional unit. Inside a Frequent Transit Network Area the City requires none. Two units is two units either way, so the duplex and the suited house carry the same count. Placement is the constraint: the R1 district regulations put parking at the rear of the lot when a lane or street gives access to the rear, and allow it elsewhere only where the City's engineering department agrees the rear cannot be reached.

Two more R1 rules shape the street face. At least one dwelling unit on the lot must have its main entrance oriented to the street, and every dwelling unit needs a paved or gravel fire access corridor at least one metre wide running from its entrance to a street lot line, clear to a height of 2.5 metres. A side-by-side duplex answers both with two front doors. An up-down duplex or a suited house usually puts the second door on the side or the rear, and the corridor has to be drawn, kept clear of the heat pump and the garbage enclosure, and lit. We have seen more than one side yard lose its corridor to a fence gate that swings the wrong way.

Sound

Section 9.11 of the BC Building Code sets sound transmission requirements between dwelling units, and the specific rating depends on the assembly, so we confirm it with the designer for each assembly. What experience adds: a side-by-side duplex with a double-stud party wall and no shared floor is the quietest two-unit building you can frame. An up-down duplex and a basement suite both put a floor between households, and a floor carries footsteps in a way a wall never does. Insulation in the joist space, resilient channel under the ceiling gypsum, and no plumbing stack in the bedroom wall are the difference between a suite a family can live above and one they resent.

Resale and family use

A suited house sells as one house to one buyer, with the suite as a mortgage helper or an in-law space. If the family later wants the basement back, the kitchen comes out and the title never changes. A stratified duplex sells as two homes to two buyers, or one half sells while the other stays in the family. Merging two strata lots back into one later means dissolving the strata, which is possible and slow.

For a multigenerational household the trade is between separation and flexibility. A side-by-side duplex gives grandparents a full-height home with their own front door, and gives the family the option to sell that half one day without moving. A suite keeps everyone under one roof with a shared stair and one set of bills, which some families want and some families learn to want less. We go through this at length in our post on multigenerational home design in Burnaby, and the design details of a good basement suite are in designing a legal secondary suite.

Two other paths exist on the same lot. A laneway or coach house is a second principal building with its own servicing questions. And a three- or four-unit building moves you into multiplex construction, where the party walls, meters and strata structure are the whole job.

On the Parkcrest lot that started this post, the family chose the duplex. The floor plans were close to the same either way. What decided it was a sentence about ten years from now: the parents' half becomes a home they can sell without touching the family's half. That sentence set the rating of the wall, put two meter bases on the side of the house, and it was the right place to start.

Frequently asked questions

Can I build a duplex with secondary suites on a Burnaby R1 lot?

Yes. The City of Burnaby's summary of the R1 district lists duplexes as a permitted form, either two sets of duplexes or one duplex with secondary suites, and suites count toward the total unit count on the lot. The City's secondary suite page adds one limit: a suite is only allowed in a side-by-side or front-to-back duplex, never in a stacked one. A side-by-side duplex with a suite in each half is four dwelling units on one lot.

Can a secondary suite in Burnaby be sold separately from the house?

No. Burnaby's R1 summary states that a secondary suite must remain registered under the same title as the primary dwelling unit it sits inside and cannot be stratified. The BC Building Code defines a secondary suite as part of a single real estate entity with the main home. If you want two saleable homes on the lot, you are designing a duplex or a multiplex, and the wall between the units is built to a different standard.

What fire separation does the BC Building Code require between duplex units?

Suites in residential occupancies must be separated by a fire separation rated at least 45 minutes, and a dwelling unit that spans two or more storeys including the basement must be separated from the rest of the building by a one-hour rated assembly. That comes from Article 9.10.9.16 of the BC Building Code. A house with a secondary suite is treated differently, with a rating that depends on the smoke alarm arrangement and whether the house is sprinklered.

Is the fire separation for a secondary suite lighter than for a duplex?

It can be. In a house with a secondary suite, the BC Building Code allows a 15-minute separation when every smoke alarm in the house is photo-electric and interconnected, a 30-minute separation with additional interconnected alarms in each unit, 45 minutes without that interconnection, and no rating at all if the house is sprinklered. We usually build the 30-minute or 45-minute assembly anyway because it also does most of the sound work.

Does each unit of a new duplex in BC get its own BC Hydro meter?

Yes on new construction. BC Hydro states that, effective April 1, it no longer provides master meter service to new multi-occupancy buildings or new residential units within them, with secondary suites excluded from that rule. So a new duplex gets a meter and an account for each unit, while a secondary suite can remain on the house meter or be given its own.

How much parking does a duplex or a suite need in Burnaby?

Outside a Frequent Transit Network Area, Burnaby's R1 summary requires one space for the first dwelling unit and half a space for each additional unit, so a duplex and a house with a suite are treated the same way at two units. Inside a Frequent Transit Network Area, the City requires no on-site parking. The R1 district also requires parking to sit at the rear of the lot when there is lane access.

Are Burnaby utility fees different for a house with a rented suite?

Yes. The City of Burnaby charges supplementary utility fees for water and sewer when a secondary suite is rented out, and the owner has to file a Supplementary Utility Fees Declaration. An owner who does not live on the property also needs a business licence to rent the suite. A stratified duplex is two separate properties, each carrying its own utility account.

Which is better for a multigenerational family in Burnaby, a duplex or a house with a suite?

It depends on how separate the households want to be and what happens to the property later. A side-by-side duplex gives each household a front door, a full-height home, and the option to sell one half on its own if it is stratified. A house with a suite keeps everyone on one title and one mortgage, with a shared stair and the option to remove the suite kitchen later and return the basement to the main home.