Do You Need a Permit to Replace a Water Heater in BC?

The short version — In BC, a like-for-like residential water-heater swap with an input of 50,000 Btu/hr or less can often be done under a replacement decal — but only if the venting method does not change. Switching fuel or BTU input, going from atmospheric to power venting, or changing from a tank to a tankless unit requires a full installation permit. In all cases, only a licensed contractor (or a homeowner gas permit holder for their own home) can legally do the work.

It is one of the most common questions we get: “It’s just a water heater — do I really need a permit?” In British Columbia the honest answer is: it depends on what is changing. Here is the rule, straight from the code.

When a decal is enough

For a straightforward, like-for-like replacement of a residential water heater with an input of 50,000 Btu/hr or less, a replacement appliance decal may be used — provided the method of venting does not change. Same fuel, same type, same venting: a decal can cover it.

When you need a full installation permit

A full installation permit is required when:

The fuel type, appliance type, or BTU input changes.
You change from atmospheric (b-vent) to power venting.
You switch from a tank-type to a tankless (instantaneous) water heater — a decal is explicitly not acceptable for this.

That last point matters: the popular tank-to-tankless upgrade always requires an installation permit, because it changes the appliance type and usually the venting and gas supply.

Who is allowed to do the work

Water-heater installation in BC must be performed by a licensed plumbing or gas contractor. For gas units, the permit is issued through Technical Safety BC; if you hire a licensed contractor, they apply on your behalf. Homeowners can apply for a homeowner gas permit only for work on a home they own and occupy, and must meet the safety requirements themselves.

Why this protects you

Permits and the inspections that come with them exist to catch venting, gas, and combustion-air mistakes that cause carbon-monoxide and fire risk. A permitted, inspected install also protects your home insurance and your resale paperwork.

The short answer

Replacing the same kind of small water heater with identical venting? A decal may be enough. Changing fuel, size, venting, or going tankless? You need an installation permit — and a licensed contractor to pull it. When in doubt, ask before the old tank comes out. Our hot water tank team handles the permit, the install, and the inspection.

Frequently asked questions

Do I need a permit to replace a hot water tank in BC?

A like-for-like residential replacement at 50,000 Btu/hr or less can often use a replacement decal if the venting method does not change. If the fuel, type, BTU input, or venting changes — or you switch to tankless — a full installation permit is required.

Does switching from a tank to a tankless water heater need a permit?

Yes. Changing from a tank-type to an instantaneous (tankless) water heater always requires an installation permit; a decal is not acceptable for that change.

Can I install my own water heater in BC?

Installation must meet BC safety codes and is normally done by a licensed plumbing or gas contractor. Homeowners may apply for a homeowner gas permit for their own occupied home but must meet the safety requirements; a licensed contractor handles the permit for you when hired.

Sources & further reading

Rebate amounts, fees, and code requirements change over time and by municipality. Figures here were verified against the official sources above as of June 23, 2026; always confirm current details with the program or your local authority before making decisions.