Small vs. Large Bathroom Renovation: Which One Actually Costs More

The quick answer: Not always. A small bathroom can cost nearly as much as a large one, because demolition, waterproofing, plumbing and installation take the same steps at any size. Size mostly changes how much material you buy. The wet area, meaning the shower or tub, is usually 60 to 70 percent of the cost. In Ottawa, a complete bathroom renovation starts from $20,000 CAD and a shower remodel starts from $13,000 CAD.

When homeowners weigh a small vs large bathroom renovation, they almost always start with the same assumption: that a smaller bathroom should cost less to renovate. With less space, fewer materials, and a simpler layout, the project seems like it should naturally be more affordable. Once the renovation quotes start coming in, though, that assumption can quickly fall apart.Over my 18 years of experience in bathroom renovations in Ottawa, I have seen many homeowners surprised to learn that the size of the bathroom does not always determine the cost of the project. In fact, some smaller bathrooms can be just as complex to renovate as larger ones.That is because many parts of the renovation process stay the same regardless of the room’s size. Below, I break down the key differences between renovating a small bathroom and a large one, including what goes into each project and what factors actually influence the overall cost.

Small vs Large Bathroom Renovation: The Basics

At first glance, bathroom size seems like the most obvious factor influencing renovation costs. While the size of the space does play a role, it does not always determine the final price as much as many people expect. A smaller bathroom may require fewer materials, but the renovation process itself still involves several important steps that stay the same regardless of square footage.Tasks such as waterproofing the wet area, adjusting plumbing, installing fixtures, demolition, and finishing details all require skilled labour and careful preparation. Because of this, a smaller bathroom does not always translate to a significantly lower renovation budget. Preparation of work, drying times, and installation processes stay relatively similar whether the bathroom is compact or spacious.This is why the overall scope of the renovation and the materials you choose often have a bigger impact on the final cost than the size of the bathroom alone.

What Goes into a Small Bathroom Renovation

Small bathrooms are common in many Ottawa homes, especially in older properties with compact layouts. These spaces are often limited in size, sometimes around 5 ft by 7 ft, which leaves less room for fixtures and storage.Even with a smaller footprint, renovating a small bathroom still involves many of the same steps as renovating a larger one. A typical renovation may include:

• Removing old fixtures and materials
• Waterproofing the shower or bathtub area
• Installing new shower or bathtub wall systems
• Updating fixtures such as faucets, toilets, or vanities
• Installing tile or modern wall surfaces
• Improving lighting and ventilation

A large portion of the renovation work also happens in the wet area of the bathroom, which includes the shower or bathtub space. This section alone can account for about 60 to 70% of the overall bathroom renovation, since it requires proper waterproofing, specialized materials, and careful installation.

What Goes into a Large Bathroom Renovation

Large bathrooms provide more design flexibility, but they can also involve additional elements that make the renovation more complex. While the core renovation work is similar to smaller bathrooms, the larger space often allows for more features and customization.A large bathroom renovation may include:

• Double vanities for added storage and functionality
• Walk-in showers with larger shower areas
• Expanded tile coverage across floors and walls
• Additional lighting, mirrors, or storage solutions
• Layout adjustments to better use the available space

Because there is more room to work with, large bathroom renovations often include upgraded materials, additional fixtures, and more customized design features. These additions can require more materials and installation work. Larger bathrooms also involve more design decisions and planning, as extra features, layout changes, and expanded surfaces can add time and complexity to the renovation process.

Small vs Large Bathroom Renovation: Side by Side

Understanding the differences between a small vs large bathroom renovation helps homeowners plan more realistic budgets. While both projects involve similar construction processes, the scale and design possibilities vary.

Feature	Small Bathroom	Large Bathroom
Average Size	Often around 5 by 7 feet	Larger layouts with more floor space
Renovation Scope	Focus on maximizing limited space	Allows for more features and layout flexibility
Fixture Options	Compact fixtures are often needed	Larger vanities, tubs, or shower areas possible
Renovation Focus	Efficient use of space and storage	Integrating multiple features into the layout

While large bathrooms typically cost more overall, smaller bathrooms can sometimes feel surprisingly expensive because the core work involved stays similar.

Factors to Consider Before Renovating Your Bathroom

Before beginning any bathroom renovation project, you should carefully evaluate your priorities and space limitations.Here are several key considerations:

• Your long-term plans: If you expect to stay in your home for many years, it is best to prioritize comfort, functionality, and features you will actually use rather than focusing solely on resale trends.
• Fixture sizes: Choosing fixtures that fit the space is important. Oversized vanities, toilets, or storage units can make a small bathroom feel cramped and reduce usable space.
• Ventilation and moisture control: Proper ventilation helps remove excess moisture and prevents issues like mould or mildew. A reliable exhaust fan is essential for a healthy bathroom environment.
• Lighting and colour choices: Good lighting, lighter colour palettes, and reflective surfaces such as mirrors can help make smaller bathrooms feel brighter and more spacious.
• Material quality: Durable materials and proper waterproofing systems help protect the bathroom from moisture damage and ensure the renovation lasts for many years.

How Our Bath Specialists Transform Your Bathroom

At Bytown Better Bathtubs and Showers, we begin every bathroom renovation by understanding the space, the renovation goals, and the overall needs of the project. This helps us plan a design that works well with the layout while keeping both functionality and long-term durability.Our renovation process typically includes an initial consultation and inspection, design recommendations suited to the space, careful selection of materials and fixtures, and professional installation of the shower or bathtub system. We also place strong focus on the bathroom’s wet area, which requires proper waterproofing and specialized installation since it often represents a large portion of the renovation work.

Bathroom Renovation Cost in Ottawa: 2026 Price Ranges

Bathroom renovation prices can vary widely depending on the materials, layout, and overall scope of the project. Even bathrooms that appear similar in size can end up with very different renovation costs. Here are real 2026 price ranges from Bytown Better Bathtubs and Showers so you can plan a realistic budget for a bathroom renovation or remodel in Ottawa.

Service	2026 Price Range
Walk-In Tub Conversion	$2,400 to $5,700 CAD
Walk-In Therapeutic Tub	$27,000 to $30,000 CAD plus tax
Tub to Shower Conversion	$13,000 to $15,000 CAD
Bathtub Remodel	$13,000 to $15,000 CAD
Shower Remodeling or Installation	From $13,000 CAD
Complete Bathroom Renovation	From $20,000 CAD

Factors That Affect Final Pricing

• Materials and fixtures: higher-end vanities, tiles, and faucets increase costs.
• Shower or bathtub upgrades: wet areas often make up a large portion of the budget.
• Labour and installation: skilled trades affect the overall renovation price.
• Layout changes: moving plumbing or walls adds complexity.
• Custom features: glass showers, shelving, or specialty tubs raise costs.

Frequently Asked Questions About a Small vs Large Bathroom Renovation