Washroom Fixture Count in BC Commercial Buildings

The number of washroom fixtures a commercial space needs in British Columbia comes from three inputs: the occupant load, the occupancy classification, and the accessibility rules. The BC Building Code sets the minimum water closets, urinals and lavatories for each occupancy. Your design must meet that minimum before a permit is issued. This guide walks property managers, landlords and operators through the calculation.

TL;DR

• Fixture counts come from BC Building Code Subsection 3.7.2 (and Section 9.31 for Part 9 buildings), using the occupant load and the occupancy group of the space.
• Occupant load is set by area-per-person factors in Subsection 3.1.17, and washrooms themselves are not counted in it.
• Assembly, business, mercantile and industrial uses each have their own table or rule, and the code assumes a 50/50 male/female split unless you can show otherwise.
• A universal washroom is required wherever washrooms are provided on a storey with an accessible path of travel, and accessible stalls do not replace it.
• In renovations, the authority having jurisdiction can require added or altered washrooms, so confirm the count before you sign a lease or a scope.

Table of Contents

• Which rules set the washroom fixture count in BC
• Step 1: establish the occupant load
• Step 2: confirm the occupancy group
• Step 3: read the table for your occupancy
• Urinals and lavatories
• Accessible and universal washrooms
• Small suites and common exceptions
• Existing buildings and tenant improvements
• A pre-design checklist for owners and tenants
• Our perspective: count the washrooms before you sign
• Plan your washroom scope with Multigroup
• FAQ
• Sources

Which rules set the washroom fixture count in BC

The BC Building Code (BCBC) sets the minimum fixture count. Subsection 3.7.2 of Division B covers larger Part 3 buildings, and Section 9.31 covers smaller Part 9 buildings. The occupancy group decides which table applies. In Vancouver, the Building By-law applies, and it is built on the provincial code.

The BC Building Code 2024 amendments table published by the Ministry of Housing names Subsection 3.7.2 and Section 9.31 as the provisions for minimum washroom fixtures. It also says existing facilities need not fully comply with them, provided the authority having jurisdiction (AHJ) accepts that.

Within the City of Vancouver, plans are reviewed under the Vancouver Building By-law 2025, which is substantially based on the BC Building Code. Its Chief Building Official is authorized to regulate construction and enforce the by-law. Burnaby, Surrey, Coquitlam, North Vancouver, New Westminster and Langley review under the provincial code through their own building departments. Always check the edition currently in force with your municipality before you finalize a count.

The tables quoted below come from the BCBC 2018 text of Section 3.7. Your design team should confirm that the same values appear in the edition your municipality is applying.

Step 1: establish the occupant load

Occupant load is the number of people a space is designed for, and every fixture count starts with it. The code assigns a floor area per person to each use in Table 3.1.17.1. Divide the net floor area of each use by its factor, add the results, and you have the load that drives the fixture tables.

The City of Nanaimo’s occupant load guide for restaurants shows how the factors work in practice, citing Table 3.1.17.1:

• 1.2 m² per person for restaurants
• 0.95 m² per person for licensed beverage establishments
• 9.3 m² per person for staff-only areas such as kitchens
• 46 m² per person for storage areas

The same guide notes that washrooms are not included in the calculation, and that a patio or deck is assumed to hold the patrons already counted indoors, so it does not add to the load. Nanaimo is one municipality, but it applies the provincial table, and the factors are the same in Metro Vancouver.

The Vancouver Building By-law defines occupant load as the number of persons for which a building or part of it is designed. That definition is why a design intent matters: if a landlord expects to lease a unit to a higher-density use later, the washroom count may need to anticipate it.

A quick illustration using those factors: a 60 m² café dining area is 50 persons (60 ÷ 1.2). That is our arithmetic, not a code example, but it shows how quickly a modest floor plate moves into the next row of a fixture table.

Step 2: confirm the occupancy group

The occupancy group determines which fixture rule applies. Assembly (Group A), business and personal services (Group D), mercantile (Group E) and industrial (Group F) each have their own approach in Sentence 3.7.2.2. Classification is set by use, so a change of use usually changes the count.

A change of use is common in tenant improvements. A City of Vancouver plumbing permit for a ground-floor tenant improvement on Granville Street shows the pattern: a retail store (Group E) became a general office (Group D), and the scope included new partition walls and washrooms along with electrical and plumbing work. The change of group is what triggered the washroom work.

Classification can also be less obvious than the sign on the door. The BC Building Code Interpretation Committee, in File 18-0148, considered a convenience store of not more than 500 m² with an integral quick-service restaurant. It treated the space as mercantile Group E, and allowed Sentence 3.7.2.2.(16) to be used, on the basis that customers are not in the occupancy for any appreciable length of time. The committee’s views are a consensus of members from AIBC, EGBC and BOABC. Raise questions like this with your designer and the AHJ early.

Step 3: read the table for your occupancy

Once you have the load and the group, the water closet count follows from Sentence 3.7.2.2. Unless the proportion of each sex can be determined with reasonable accuracy, the code assumes the load is divided equally between males and females. The counts below are per sex, from BCBC Section 3.7.

Two things catch owners out. First, the assembly table is cumulative and weighted toward female fixtures, so the totals are higher than a simple split suggests. Second, the table is read separately for each sex, so a 50-person Group D office (25 per sex) needs one water closet for each sex under the table, before any other provision applies.

For industrial buildings and warehouses, headcount matters more than floor area. A Group F workforce of 60 (30 per sex) falls in the 26 to 50 row and needs three water closets for each sex under Table 3.7.2.2.-C. If your landlord is planning a warehouse reconfiguration that adds a shift or a mezzanine, recheck the headcount. Our warehouse renovation work regularly starts with that question.

Urinals and lavatories

Urinals can replace part of the male water closet count, and lavatories are counted by room. Under Section 3.7, urinals may replace up to two-thirds of the male water closets, and if only two are required, one urinal may replace one. Each room with one or two water closets or urinals needs one lavatory, plus one more for each additional two.

This matters for layout. A urinal takes less floor area than a stall, so a washroom with a higher male count can sometimes be planned more compactly. Lavatory counts are driven by how many water closets and urinals sit in each room, so splitting fixtures across several smaller rooms can change the sink count. Your designer should test both layouts against the code.

For drawing-level guidance on clearances, door swings and layout review, see our post on commercial restroom layout guidelines.

Accessible and universal washrooms

Accessibility adds fixtures on top of the table count. A universal washroom is required at each location where washrooms are provided on a storey that requires an accessible path of travel. Where a washroom has more than two water closets, or more than one water closet plus a urinal, at least one stall must also be accessible.

The BCBC 2024 Illustrated Guide on Accessibility summarizes Sentences 3.8.2.8.(1) and (2). A universal washroom needs a clear turning space of at least 1,700 mm in diameter, one lavatory, one water closet, grab bars, a coat hook, a toilet paper dispenser and emergency lighting. The guide also states that, effective March 8, 2024, new commercial and public buildings need power-operated doors at building and accessible washroom entrances, and a full-sized changing space in universal washrooms. Where stalls are provided in an accessible washroom, the guide notes one stall for persons with limited mobility for every 10 stalls.

The Interpretation Committee’s File 24-0047 is the clearest worked example. For an assembly use with an occupant load of 140 persons, Table 3.7.2.2.-A requires 2 male and 3 female water closets. Because one universal washroom is also required, the committee described compliant arrangements such as 2 male, 2 female and 1 universal, or 1 male, 3 female and 1 universal, or 4 unisex plus 1 universal. It also noted that accessible stalls do not remove the need for the universal washroom.

That gives owners flexibility, since a universal washroom can count toward the table total in the committee’s examples. Confirm the approach with the AHJ before drawings are finalized. For the recent changes in detail, read our post on code changes affecting accessible washrooms.

Small suites and common exceptions

Small and short-stay uses have relief provisions. Under Sentence 3.7.2.2.(4), one water closet can serve both sexes where the occupant load of certain occupancies is not more than 10 persons. For mercantile suites of not more than 500 m², Sentence (16) lets the count be based on the number of staff alone.

The Appeal Board has tested these provisions. In BCAB decision 1831, published August 29, 2019, the board found that Sentences (15) and (16) both applied to a 224 m² mercantile suite in a building over 600 m². The count was based on total staff, while the water closets still had to be available to the public.

The Appeal Board’s decision 1835 is a useful check on arithmetic. For an assembly area with 70 persons (35 male, 35 female), Table 3.7.2.2.-A gives one water closet for males and two for females, three in total, and the table values are cumulative.

Location matters as well as number. BCAB decision 1886, published April 28, 2022, dealt with the location of required water closets for a ground-floor café with an occupant load of 30. If your café relies on a shared building washroom, ask your design team how that arrangement will be reviewed.

For retail tenants, this is why a small shop and a larger store can end up with very different washroom requirements. Staff count, suite area and building size all matter, so confirm them before layout. Our retail buildout team can help scope this against your lease.

Existing buildings and tenant improvements

In an existing building, the AHJ decides how far a renovation must go. The provincial amendments table says existing facilities need not completely comply with Subsection 3.7.2 or Section 9.31 if the AHJ accepts that. Municipal guidance shows where acceptance usually stops: renovating the washrooms, or increasing the occupant load, can trigger upgrades.

The City of Nanaimo’s guide says existing establishments that do not meet current washroom requirements will be required to add or change washrooms if washroom renovations are under way, or if a proposed occupant load increase leaves too few water closets. Other municipalities may apply this differently, so treat it as a signal to ask early.

For tenants and property managers, these are the common triggers:

• A change of use from one occupancy group to another, such as retail to office.
• A higher occupant load, for example a restaurant adding seats or a clinic adding treatment rooms.
• A scope that includes the washrooms themselves.
• Accessibility upgrades in existing buildings, which the 2024 amendments table says are subject to Article 3.8.4.5.

If the existing count is short, the cost is usually not the fixtures. It is the floor area, the drain and vent routing, and the schedule impact on neighbouring tenants. Plumbing permits are part of the picture too, and our Vancouver plumbing permit guide covers the steps. Our tenant improvement projects build this check into pre-construction.

A pre-design checklist for owners and tenants

Before you commit to a lease or a scope, gather six items. Together they let a designer confirm the fixture count in one pass rather than in permit comments. This is the order we suggest.

1. Use and occupancy group. State the intended use and confirm the group with the designer. Note any planned change from the previous tenant.
2. Net floor areas by use. Separate dining, kitchen, storage and staff areas, since each has its own factor. Exclude washrooms.
3. Occupant load. Calculate from Table 3.1.17.1, and note any seating or headcount you expect to add later.
4. Sex split. Use the equal split unless you can determine the proportions with reasonable accuracy.
5. Existing fixtures. Record what exists, where it sits, and whether shared washrooms in the building serve your suite.
6. Accessibility. Identify whether your storey needs an accessible path, and plan the universal washroom and entrance doors.

Then send the package to your municipal building department for a pre-application conversation where one is available. The Interpretation Committee’s work reminds us that the City of Vancouver and the provincial Building and Safety Standards Branch both take part in its proceedings, so interpretations are not made in isolation. Still, your AHJ has the final word on your project.

Our perspective: count the washrooms before you sign

We see washroom count decide the schedule on more commercial projects than owners expect. A fixture shortfall can mean a wall moves, a demising line shifts, or a drain has to be cut into a slab in an occupied building.

Our approach is to treat the count as a pre-construction deliverable. We confirm the occupancy group, the occupant load and the accessibility requirements with the design team and the municipality, then price the washroom scope as part of a fixed scope with a clear schedule.

Because we self-perform and manage the whole project, one accountable team coordinates the plumbing, framing, finishes and permits. That is built for property managers and operators who need predictable work inside occupied buildings across Metro Vancouver, with WorkSafeBC prime contractor duties and BC Building Code compliance handled on our side.

MultigroupTeam

Plan your washroom scope with Multigroup

Multigroup Contracting is a Vancouver commercial general contractor serving Metro Vancouver and the Lower Mainland. We deliver tenant improvements, office fit-outs, retail and restaurant buildouts, warehouse renovations, and common-area upgrades for multi-unit and strata buildings. We manage City of Vancouver and municipal permits, and phased or after-hours work in occupied buildings.

If you are comparing spaces or scoping a renovation, bring us the floor plan and the intended use. We will walk through the fixture count with you as part of the scope. Start on our commercial construction page or contact us. If your project is a café or restaurant, see our coffee shop and restaurant renovation work.

FAQ

How many washrooms does a small BC office need?

It depends on the staff count. For a Group D office, Table 3.7.2.2.-B gives one water closet for each sex for 1 to 25 persons of each sex, and two for 26 to 50. Where the load is not more than 10 persons, one water closet may serve both sexes in some occupancies. Confirm with your municipality.

Do I need a universal washroom in a tenant improvement?

If washrooms are provided on a storey that requires an accessible path of travel, the code requires a universal washroom at that location. Accessible stalls do not replace it. For existing buildings, the AHJ decides how far the requirement extends, so ask before design starts.

Is the BC fixture count the same in Vancouver as elsewhere in the province?

The Vancouver Building By-law is substantially based on the BC Building Code, so the framework is the same. Plans in Vancouver are reviewed under the by-law and its Chief Building Official. Other Metro Vancouver municipalities review under the provincial code through their own departments.

Do patios count toward occupant load?

Under the City of Nanaimo’s guidance, patios and decks are assumed to be occupied by patrons already counted indoors, so they do not add to the load. Washrooms are also excluded from the calculation. Confirm your own municipality’s practice with its building department.

Sources

• BCBC 2018 Division B, Section 3.7 Health Requirements
• Vancouver Building By-law 2025, Volume 1
• City of Nanaimo, Occupant Load Calculations for Restaurants and Take-Outs
• City of Vancouver plumbing permit PP-2024-01734
• BC Building Code Interpretation Committee, File 18-0148
• BC Building Code Interpretation Committee, File 24-0047
• BCBC 2024 Illustrated Guide on Accessibility

Recommended

• Pass Review: BC Commercial Restroom Layouts, Accessibility Checklist
• BC owners and GCs: 3 code changes that affect accessible washrooms