What a Garden Suite Costs to Build in Greater Victoria

The question comes up for a handful of reasons, and they're rarely insignificant. A parent who needs to be closer, an adult child who needs their own door to close, a bit of rental income to help carry the mortgage, or simply somewhere for guests to stay that isn't the living room couch.

Whatever the reason, the next question is almost always the same: what does this actually cost? And the honest answer isn't a single number, it's a range that depends on size, site, and how much of what you need is already there.

The Average Cost of a Garden Suite in Greater Victoria

Based on our own project data rather than a national average that doesn't reflect this market, a garden suite in Greater Victoria typically starts around $210,000 for a compact suite and climbs from there with size and finish, landing upwards of $320,000 for a large suite at a standard finish level, and higher still for a bigger or more custom finished project. Where a project lands in that range comes down to two things more than any other: how big the suite is, and what the site already has to offer.

Garden Suite Pricing by Size

Square footage is the most reliable starting point, and it works differently here than it does for a full-sized home.

A compact suite, 350 to 500 square feet, with an efficient kitchen, bathroom, and sleeping space, typically starts around $600 or more per square foot.

A mid-sized suite, 500 to 800 square feet, with separate living and sleeping zones and its own entry, typically starts around $500 or more per square foot.

A large suite, 800 square feet and up, with room for the layout to breathe, typically starts around $400 or more per square foot.

Each figure reflects a standard, quality level of finish, and the "or more" can add up to a meaningful premium, not just a small one, once custom millwork, upgraded tile, or other finish-level choices enter the picture.

The pattern is the opposite of how most people expect construction pricing to work. A kitchen and a bathroom cost close to the same amount to build whether they sit inside a 400 square foot suite or a 900 square foot one, and spreading that fixed cost over less floor area is what pushes the per-square-foot number up as the suite gets smaller.

What Shapes Your Number Within a Size Tier

Two suites of the same size can land at very different numbers, and it's rarely the finishes that explain the gap.

Site servicing is the biggest factor: a property that already has power, water, and sewer or septic capacity nearby will cost less to build on than one that needs all of it run from scratch. Whether you're building new or converting an existing structure matters too. Starting from an empty part of the lot is the most common path and the most predictable to price, while converting an existing garage, shed, or outbuilding can save on some lines and add cost on others, since the existing structure often needs reinforcing to do more than it was originally designed to support.

Zoning and permitting also vary more than people expect from one municipality to the next. Saanich regulates garden suites under its own Schedule H provisions, and provincial legislation around small-scale multi-unit housing has changed what's permitted outright in a number of Greater Victoria municipalities over the past couple of years. What's permitted on a lot in Saanich isn't automatically permitted the same way in Oak Bay or Victoria, which is exactly why this is worth confirming for your specific property before a design goes very far.

Our garden suite permit planning tool walks through eligibility, documentation, and realistic timelines by municipality, so you can see your permitting path before you spend a design dollar.

Where the Money Actually Goes

Beyond the visible construction, a few categories shape every build we do, garden suites included.

Pre-construction planning typically runs 1-3 % of the project.

Design runs 3-10%, depending on how custom the suite is.

Tax applies at 5% GST plus 7% PST.

And we recommend building in a 10-15% contingency, since most clients end up choosing an upgrade or two along the way, and it's a better experience to have room for that built in from the start than to find it by trimming something else.

Read more: What is a Cost-Plus Builder?

The Most Expensive Elements of a Garden Suite

Site servicing is often the first real variable, and it's a function of distance to services and ground conditions more than anything else. A drilled well typically runs $15,000 to $35,000, a septic system $25,000 to $60,000, and a hydro or utility connection $5,000 to $50,000 depending on how far it has to travel. These costs apply whether you're building a garden suite or a full custom home, since they're driven by the site, not the structure sitting on it.

Structure, roofing, windows, and envelope make up the next layer, and they scale with size and complexity rather than following a fixed number.

On a recent 990 square foot Stillwater ADU conversion, insulation and building envelope came to $11,885, windows to $19,700, and the roof rebuild to $15,980. That project also involved adding a full second story to an existing structure, which meant structural and cantilever engineering most ground-up suites won't need, at $35,000. Interior finishes followed a similar pattern: flooring at $8,550, lighting at $1,300, plumbing fixtures at $7,100, and millwork and built-ins at $37,900, the last of these reflecting custom cabinetry and tile well above a standard finish level.

That combination, a structurally complex conversion plus an upgraded finish package, is exactly why this particular project landed above the per-square-foot starting points. It's a useful real-world anchor for what these categories actually cost, not a typical total for a suite this size. (See the case study and project here.)

Is a Garden Suite a Good Investment?

A garden suite tends to pay for itself in more than one way. For a family, it's a space that keeps everyone close without everyone sharing a roof, whether that's a parent who wants to be nearby or an adult child who needs their own door. For a property, it's living space and, where rented, income that a bare lot doesn't generate. We don't treat either of those as the main reason to build one, the daily value of the space usually matters more to our clients than the spreadsheet, but it's worth knowing both are real.

If You're Weighing One for Your Property

Every property is different, and the honest range for yours depends on what's already there, what your municipality allows, and what you actually want the space to do. If you're thinking about a garden suite, a carriage house, or a secondary suite of your own, we'd be glad to talk through what the real numbers would look like for your lot.

Let's start a conversation. →

Stillwater Custom Homes & Renovations builds custom homes and renovations across Greater Victoria, the Saanich Peninsula, and the Gulf Islands. We are a licensed BC builder and registered member of Passive House Canada.

Frequently Asked Questions

Is a garden suite cheaper per square foot than a custom home?

Usually the opposite. A garden suite still needs utilities, a full kitchen and bathroom, and those fixed costs get spread over a much smaller footprint than they would in a full-sized home, which tends to push the per-square-foot number higher, not lower.

Does zoning allow a garden suite on every property?

Not automatically; it depends on the municipality and the specific lot. Saanich, for example, has its own Schedule H garden suite regulations, and recent provincial housing legislation has changed what's permitted outright in several Greater Victoria municipalities. Our garden suite permit planning tool walks through eligibility, documentation, and realistic timelines by municipality, so you can see your permitting path before you spend a design dollar.

Can an existing structure be converted into a garden suite instead of building new?

Yes. It can work well and sometimes saves on site servicing that's already in place, though the existing structure may need reinforcing to carry new load. We've written about how that played out in detail on one recent project, where an existing structure gained a full second story.

What does site servicing typically cost?

It depends on distance and ground conditions more than anything else. A drilled well typically runs $15,000 to $35,000, a septic system $25,000 to $60,000, and a hydro connection $5,000 to $50,000, and these figures apply whether the building on top is a garden suite or a full home.

Does a garden suite need separate permits from the main house?

Yes, since it's its own structure, and the specific requirements depend on your municipality. We walk through what applies to your property early, before a design is finalized, so permitting isn't a surprise partway through.