The short answer
In many cases yes, because BC’s small-scale multi-unit housing rules require local governments to allow secondary suites and/or accessory dwelling units, such as laneway homes or garden suites, in single-family zones across the province. In municipalities over 5,000 people, many single-family and duplex lots must also allow three or four units, and six near frequent bus service. What you can build on a particular lot still depends on local zoning, site rules and permits.
Check current rules: Local governments had to update bylaws by June 30, 2024 for Bill 44, and by June 30, 2026 for Bill 25 (2025), unless granted an extension. Check your municipality’s current zoning.
In plain English
Small-scale, multi-unit housing, usually shortened to SSMUH, is the Province’s name for ground-oriented homes that fit into single-family neighbourhoods: secondary suites, detached accessory dwelling units such as garden suites and laneway homes, and small multi-unit buildings like triplexes, townhomes and house-plexes.
The Province now sets minimums that local zoning has to meet.
Secondary suites and/or accessory dwelling units are allowed province-wide in single-family zones where three- to six-unit zoning is not required, in every municipality and regional district electoral area.
In larger places the minimum goes further.
On lots zoned only for single-family or duplex use within an urban containment boundary, or in a municipality of more than 5,000 people, at least three units must be allowed on lots of 280 m² or smaller and at least four on larger lots.
Six units must be allowed on lots over 280 m² near a frequent bus stop, meaning a bus at least every 15 minutes on average during set weekday and weekend hours.
Minimums are not a building permit. Each municipality writes the detailed rules for size, setbacks, height, parking, servicing and trees. Surrey is a good illustration: every residential zone there that allows detached houses, duplexes and houseplexes also allows a coach house or garden suite, generally between 35 m² and 75 m², with up to 120 m² in some zones where the main house is below its maximum floor area ratio.
Surrey adds practical conditions. A coach house must be attached to a garage, smaller lots in some zones need lane access for one, and coach houses and garden suites need one extra parking space.
The City also points owners to sewer, water, BC Hydro and gas connection costs, development permit areas and tree protection before applying.
Extra units can change other rules too.
For the home owner grant, a laneway home or the other units of a duplex, triplex or fourplex can count as separate residences for partitioning, while a suite inside your own home does not.
And under the provincial short-term rental rules, a host can rent their principal residence plus one secondary suite or accessory dwelling unit on the same property.
How it works
Find your current zone
Use your municipality’s mapping tool. Zoning changed in many places after 2024, so do not rely on an old listing or survey.
Read the zone’s rules
Check unit count, maximum size, lot coverage, setbacks, height and parking for your zone.
Check access and servicing
Lane access, driveway width, and sewer, water, electrical and gas connections can decide whether a project is feasible.
Look for overlays
Development permit areas, road-widening setbacks and protected trees can add steps or limit siting.
Talk to the city before you buy
If a purchase depends on adding a unit, ask the planning department and make the offer subject to your own review.
Budget for permits and professionals
Expect drawings, registered professionals where required, and home warranty enrolment or an exemption for new homes.
Example
Surrey publishes its limits in square metres. One square metre is about 10.7639 square feet, so the limits convert as follows.
| Minimum: 35 m² × 10.7639 | about 377 sq ft |
|---|---|
| Standard maximum: 75 m² × 10.7639 | about 807 sq ft |
| Maximum in RA, R2, R2-O and R3 zones where allowed: 120 m² × 10.7639 | about 1,292 sq ft |
These are Surrey’s published limits for coach houses and garden suites. Other cities set their own; check your zone before planning a project.
Who it applies to, and the exceptions
Usually applies to
- Owners of single-family and duplex lots across BC.
- Buyers comparing houses for future suite or laneway potential, for example in Surrey, Langley, Abbotsford, Richmond or Coquitlam.
- Families planning multi-generational living on one lot.
Exceptions and limits
- Lots that already allow three or more units are not affected by the three- and four-unit requirement.
- The Province notes that some exemptions apply; they are set out in the regulations and the provincial policy manual.
- Municipalities granted an extension may update their bylaws later than the provincial deadline.
Common mistakes
- Assuming the provincial minimum means a specific design is approved. Local rules still apply.
- Ignoring lane access or service connection costs when estimating a laneway home budget.
- Buying for a future suite without checking parking requirements.
- Treating an unpermitted suite as a legal unit. Unpermitted work can be a disclosure issue and a financing issue.
- Expecting a suite inside your house to help with the home owner grant threshold. Only separate residences count for partitioning.
Questions people also ask
What is SSMUH in BC?
Small-scale, multi-unit housing: secondary suites, laneway homes, garden suites, triplexes, townhomes and house-plexes that fit into single-family neighbourhoods.
Provincial law requires local governments to allow minimum versions of them.
How many units can I build on my lot?
It depends on location and lot size.
In qualifying areas the minimum is three units on lots of 280 m² or smaller and four on larger lots, with six on larger lots near frequent bus service. Your local zoning sets the details.
Can I build a laneway home in Surrey?
Surrey allows coach houses or garden suites in every residential zone that allows detached houses, duplexes and houseplexes, subject to size, siting, access, parking and permit requirements.
How big can a coach house be in Surrey?
Generally 35 m² to 75 m², and up to 120 m² in RA, R2, R2-O and R3 zones if the existing house or duplex is below the maximum floor area ratio.
Does a laneway home affect the home owner grant?
It can help. A laneway home counts as a separate residence for partitioning, which may let you claim the grant on a high-value property.
Can I rent a laneway home as a short-term rental?
Where the provincial principal residence requirement applies, a host can rent their principal residence plus one secondary suite or accessory dwelling unit on the same property, subject to local bylaws.
Official sources
Facts on this page come from the official sources below, reviewed October 6, 2026. Rules, amounts and dates change; confirm the current version and your own eligibility before acting. This is general information, not legal, tax or financial advice.
- Small-scale, multi-unit housingProvince of British Columbia
- Coach houses and garden suitesCity of Surrey
- Home owner grant (partitioning)Province of British Columbia
- Short-term rental principal residence requirementProvince of British Columbia