How Much Does a Basement Renovation Cost in 2025?

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An unfinished basement is like a blank canvas. It may look dark and underused now, but with the right renovation plan, it can become your home’s most valuable square footage. Whether you are dreaming of a cozy home theatre, a rental suite, or a multi-functional family space, the first question is always the same:

How much does it cost to renovate a basement in Ontario in 2026?

In Ottawa, Gatineau, and Kingston, most basement renovations range from $25,000 to $60,000, depending on size, layout changes, materials, and whether you are adding plumbing or structural upgrades. On a square-foot basis, homeowners can expect to pay $30 to $75 per square foot, with higher-end remodels reaching beyond that range.

Let’s break it down so you can plan confidently.

Key Takeaways

Basement renovations in Ontario typically cost $30 to $75 per square foot
Full remodels range between $25,000 and $60,000
Adding a bathroom can cost $10,000 to $25,000
Waterproofing can add $2,000 to $7,000
A finished basement may offer up to 70% ROI
Furnishing your new basement can range from $3,000 to $15,000+

In This Article...

Average Basement Renovation Cost in Ontario
Cost Per Square Foot Breakdown
DIY vs Professional Renovation Costs
Hidden Costs and What Affects Pricing
Basement Renovation ROI in Ottawa
Permit Requirements in Ontario
How Much Does It Cost to Furnish a Finished Basement?
Financing Your Basement Project
FAQs

1. Average Basement Renovation Cost in Ontario

The total cost of your basement renovation depends heavily on what you are starting with and what you ultimately want the space to become. A completely unfinished basement with exposed framing, concrete floors and minimal lighting will require significantly more work than a partially finished space that simply needs cosmetic upgrades.

Project Type	Estimated Cost Range	Best For
Basic Basement Finishing	$10,000 – $34,000	Adding drywall, flooring, and lighting
Full Remodel	$25,000 – $60,000	Layout changes, new rooms
Rental Suite Conversion	$40,000 – $75,000+	Income property setup
DIY Remodel	$5,000 – $20,000	Skilled homeowners

A simple finishing project focuses on making the space livable. A full remodel may involve adding bathrooms, kitchens, structural work, or egress windows.

In Ottawa, especially, older homes may require additional updates to meet current building codes.

2. Basement Renovation Cost Per Square Foot

Scope	Cost Per Square Foot
Basic Finish	$30 – $50
Mid-Range Remodel	$50 – $65
High-End Remodel	$65 – $100+

Looking at renovation costs per square foot is one of the most practical ways to build an early budget before meeting with contractors. This approach allows you to compare different finish levels and understand how design decisions directly impact your total cost.

However, square footage pricing is not just about size. It also reflects the level of finishing, ceiling treatments, flooring quality, lighting upgrades and whether plumbing or structural changes are required. Two basements with the same square footage can vary by tens of thousands of dollars depending on the materials and level of customization.

For example, a 1,000 square foot basement renovation might cost:

Around $30,000 for a simple finish
Around $50,000 for a mid-range remodel
$75,000 or more for high-end finishes or structural changes

Higher-end projects often include custom millwork, luxury vinyl plank flooring, engineered hardwood, recessed lighting, soundproofing and premium trim packages.

It is important to remember that basements often hide surprises. Older homes may require foundation reinforcement or upgraded drainage systems, which can increase costs beyond square footage estimates.

3. DIY vs Professional Basement Renovation

When budgeting for a basement renovation, one of the biggest decisions homeowners face is whether to do it themselves or hire professionals. The cost difference can be substantial, especially when labour accounts for a large portion of the renovation budget.

DIY projects can significantly reduce expenses if you have experience with framing, drywall installation, flooring, or painting. Many homeowners complete portions of their renovation themselves while hiring licensed professionals for electrical, plumbing or structural work.

That said, basements often involve technical challenges such as moisture control, proper insulation and ventilation. Mistakes in these areas can lead to long-term issues such as mould, structural damage, or failed inspections. The right balance between DIY and professional work depends on your comfort level, skill set and timeline.

DIY Costs by Basement Size

Basement Size	Estimated DIY Cost
Small Under 700 sq ft	$5,500
Medium 700 to 1,000 sq ft	$8,000
Large 1,000+ sq ft	$15,000+

Professional Costs

Basement Size	Estimated Professional Cost
Small	$10,500+
Medium	$15,000+
Large	$21,000+

Professional labour often makes up the largest portion of the budget. However, there are important considerations. Electrical, plumbing and structural changes in Ontario typically require licensed professionals and inspections. Mistakes in these areas can result in safety risks or failed inspections during resale.

4. What Affects Basement Renovation Costs?

Several factors influence the cost of renovating your basement. Here are some of them…

Size and Layout

Larger basements require more drywall, flooring and labour hours. Open-concept layouts are typically more affordable than dividing the space into multiple rooms because each wall adds framing, electrical work and finishing.

Ceiling height also matters. If ductwork or beams limit headroom, adjustments may be required to meet building code minimum height requirements.

Custom Features

Bathrooms are one of the biggest cost drivers. Installing a bathroom often costs between $10,000 and $25,000 because it involves plumbing lines, drainage and ventilation.

Wet bars and kitchenettes range from $6,000 to $20,000. Rental suite conversions may require egress windows, fire separation and separate entrances, which significantly increase costs.

Flooring and Ceiling Choices

Basements are prone to moisture, so flooring selection matters. Vinyl plank and engineered hardwood are more moisture-resistant than traditional hardwood. Carpet remains a budget-friendly choice but may require subfloor preparation.

Drop ceilings are more affordable and allow easier access to plumbing and wiring. Drywall ceilings create a polished look but increase labour costs.

Foundation and Waterproofing

Repair Type	Estimated Cost
Waterproofing	$2,000 – $7,000
Crack Sealing	$500 – $2,500
Foundation Repair	$30 – $100 per sq ft

Waterproofing before finishing is critical. Fixing moisture issues after installing drywall and flooring can cost far more than preventative treatment.

5. Does a Basement Renovation Increase Home Value?

On average, a finished basement can provide up to 70 percent return on investment, depending on the quality of finishes and whether permits were properly obtained. Well-designed layouts that include additional bedrooms, bathrooms or legal rental suites typically yield the highest returns.

For many homeowners, a basement renovation is not just about comfort. It is also about increasing property value and improving resale potential. In competitive housing markets like Ottawa, Gatineau and Kingston, finished basements are highly attractive to buyers because they add functional square footage without expanding the home’s footprint.

A rental suite can dramatically increase both property value and potential monthly income. However, it must meet the Ontario Building Code requirements to be legally recognized. Proper fire separation, ceiling height compliance and egress windows all play a role in long-term value.

Even if resale is not your immediate goal, investing in a thoughtfully designed basement improves livability and makes your home more adaptable to future needs.

6. Permit Requirements in Ontario

Permits are an essential part of basement renovations, especially when structural, plumbing or electrical work is involved. In Ottawa, Gatineau and Kingston, building permits ensure that renovations meet safety standards and current building codes.

Projects that typically require permits include:

Electrical system upgrades
Plumbing installations or bathroom additions
Structural framing changes
Egress window installations
Rental suite conversions

Permit costs range from $100 to $2,000, depending on the project scope and the municipality. While it may be tempting to skip permits to reduce upfront expenses, doing so can create serious complications later. Unpermitted work can delay home sales, reduce appraisal value or require costly corrections.

Permits protect both your investment and your safety. They also provide documentation that your basement renovation was completed properly and legally.

7. How Much Does It Cost to Furnish a Finished Basement?

Renovation is only half the story. Furnishing your basement completes the transformation.

Here is what homeowners typically spend:

Furniture Type	Price Range
Recliners and Accent Chairs	$1,000 – $2,500
Sofas and Sectionals	$2,000 – $10,000
Entertainment Units	$1,000 – $4,500
Coffee Tables	$300 – $1,200

A complete basement furniture setup can range from $3,000 to $15,000 or more, depending on size and layout. Planning furniture measurements early ensures your renovation layout supports your intended use.

For rental suites, sleeper sofas and compact sectionals are popular choices. For home theatres, reclining sectionals are often preferred.

8. Financing Your Basement Project

Renovating and furnishing simultaneously can strain cash flow. Many homeowners choose to finance portions of their project.

La-Z-Boy partners with Flexiti Financing to offer instant approval and easy monthly payments. Once approved, customers can shop and finance with Flexiti anytime.

For more information, check out this article on Furniture Financing.

9. FAQs About Basement Renovation Costs

How long does a basement renovation take?

Most basement renovations take between 4 and 8 weeks once construction begins. However, permit approvals, contractor scheduling and material delivery timelines can extend that timeframe. Larger remodels or rental suite conversions may take longer.

Does finishing a basement increase property taxes?

In many cases, yes. Increasing livable square footage or adding bedrooms and bathrooms can raise assessed value. The increase depends on local assessment practices and the scope of renovation.

What adds the most value in a basement renovation?

Legal bedrooms with egress windows, full bathrooms, and rental-suite features tend to offer the strongest return. Open, flexible layouts that appeal to a broad range of buyers also improve resale value.

Is it worth renovating an older basement?

Yes, as long as foundation and moisture issues are addressed first. Structural integrity and proper waterproofing should always take priority over cosmetic finishes. Once those are secure, finishing an older basement can dramatically improve comfort and usability.

What’s Next?

Now that you have a better understanding of the cost of basement renovations, you’re ready to invest in one of your own! That said, why not shop at one of our stores today?

Visit us at a local Ottawa, Gatineau & Kingston La-Z-Boy location to view our selection in person and take a sit test. You can also schedule an appointment online.

Our interior sales consultants are always eager to lend a helping hand. Take advantage of our interior design services to see how a sofa bed could fit in your home design.

To learn more about La-Z-Boy living room furniture, take a look at this comprehensive living room furniture buyer’s guide.

Nicholas Carchidi

Content Writer at StyleMeetsComfort.ca

Nick has been the lead content writer for La-Z-Boy Ottawa, Gatineau and Kingston since 2022, specializing in the furniture industry. He collaborates with experts in his field, ensuring that each piece on the La-Z-Boy Learning Centre is accurate and valuable. He provides readers with expert knowledge on all things furniture. If you'd like to learn more about Nick, you can check out his LinkedIn page here.