A bathroom renovation is more than just an expense—it's an investment in your home. A well-designed and professionally built bathroom can improve your daily comfort, increase your property's value, and make your home more attractive to future buyers.

As bathroom renovation contractors serving Toronto and the GTA, we've found that the success of a project isn't determined by the tile or the fixtures alone. The quality of the work hidden behind the walls is what truly determines how well your bathroom will perform for years to come.

Do You Need a Permit?

One of the most common questions homeowners ask is whether a building permit is required.
In many Toronto bathroom renovations, a permit is not required if you're simply replacing fixtures while keeping the same plumbing layout. For example, if your existing bathroom has one toilet, one vanity, and one bathtub (a typical three-piece bathroom), and it remains a three-piece bathroom after the renovation, a permit is generally not required.

A permit is typically required when plumbing fixtures are added or the plumbing system is altered—for example, converting a three-piece bathroom into a four-piece bathroom by adding a separate shower. When a permit is required, the approval process usually takes approximately two to three weeks, and the plumbing rough-in work is inspected by the City before construction continues.

The Rough-In Stage: The Most Important Part of the Renovation

Once demolition is complete, the project moves into the rough-in stage. While homeowners rarely see this work after the walls are closed, it's arguably the most important phase of the entire renovation.
This is when all plumbing, electrical, HVAC, and ventilation systems are installed or relocated.

Depending on the design, this may include:

• Relocating plumbing lines

• Moving heating vents if necessary

• Installing a new exhaust fan (required by today's building standards when mechanical ventilation is needed)

• Running electrical wiring for GFCI receptacles

• Wiring for heated floors

• Heated towel warmers

• LED mirrors

• Pot lights

• Low-voltage lighting for shower niches and accent lighting

Careful planning during this stage ensures that every feature works properly once the renovation is complete. Making changes after the walls are finished is significantly more expensive.

Proper Insulation Makes a Difference

Bathrooms are exposed to constant humidity and temperature changes, making insulation especially important.
For exterior walls, we recommend Rockwool Comfortbatt insulation with a properly installed vapour barrier to improve thermal performance and help control moisture.
For interior partition walls, Rockwool Safe'n'Sound insulation is an excellent choice. It reduces sound transmission between rooms while allowing the wall assembly to dry as intended, without trapping unnecessary moisture.

Choosing the Right Wall Materials

Not all drywall is suitable for bathrooms.
While standard drywall can be installed in dry areas, we generally recommend moisture-resistant gypsum board throughout the bathroom for added protection.
Inside shower enclosures, cementitious or engineered tile backer systems such as DensShield or Schluter® backer boards provide a far more durable substrate for tile installation.

Waterproofing Is Non-Negotiable

If there's one step homeowners should never compromise on, it's waterproofing.
Tile and grout are not waterproof on their own. Without a proper waterproofing system behind the tile, moisture can eventually reach the framing, leading to mould, rot, and expensive repairs.
At HAUS Group, we recommend complete waterproofing systems such as Schluter®, or an equivalent professional-grade system, to protect the structure behind the finished surfaces.

Tile Installation
Selecting the right tile is about more than appearance.