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Basement Renovation Guide

Writer's picture: The BroLawsThe BroLaws


Basement reno guide. What you should know about and plan for. Unfinished basement in background.

Unfinished basements offer homeowners a unique opportunity to transform a blank canvas into a functional and personalized space. Whether you’re aiming to expand your living area, create a rental unit for passive income, or add luxury features like a home theater or gym, the possibilities are vast. However, a successful basement renovation requires careful planning and adherence to essential guidelines.


Built-in entertainment wall with storage, display shelves, recessed tv, electric fireplace and accent wall.

Define the Purpose of Your Basement


The first step in any basement renovation is to determine its intended use. This decision will influence the design, layout, and necessary features of the space. For instance, a basement apartment will require considerations for separate entrances, kitchens, and bathrooms, while a recreational area might focus on open spaces and entertainment systems.



Insulation: Ensuring Comfort and Efficiency


Rock Wool insulation

Proper insulation is crucial for maintaining a comfortable temperature in your basement throughout the year. In many municipalities, including Oshawa, Ontario, the minimum required R-value for basement walls is R20. The R-value measures the insulation’s resistance to heat flow; higher values indicate better insulating properties.



There are several methods to achieve the desired insulation:

  • Batt Insulation: This involves attaching rigid foam boards to the concrete foundation, constructing stud walls in front, and filling the spaces between studs with batt insulation. A 6mm polyethylene vapor barrier is then installed on the interior side to prevent moisture infiltration.

  • Basement Blanket: This method uses a combined roll of R20 fiberglass insulation and vapor barrier, secured directly to the foundation. Stud walls are then built in front of this blanket. While cost-effective and quick to install, it may result in a slight loss of interior space.

  • Spray Foam Insulation: This option provides superior sealing by acting as both insulation and vapor barrier. After perimeter framing and utility installations, spray foam is applied to cover the entire perimeter, including floor joist cavities. Although more expensive, it offers excellent thermal performance and a high-quality seal.


In some projects, a combination of batt insulation and spray foam is used—applying batt insulation to the main walls and spray foam to hard-to-reach areas like joist cavities.


Subfloor Installation: A Foundation for Success


Dricore subflooring tiles
Dricore Subfloor

Installing a subfloor in your basement is vital for several reasons:


  • Insulation and Vapor Barrier: A subfloor adds an extra layer of insulation and helps prevent moisture from seeping into the finished flooring.

  • Leveling the Floor: Basement floors are often uneven; a subfloor can create a flat, stable surface for your chosen flooring material.

  • Expanded Flooring Options: With a proper subfloor, you can install a wider range of flooring types, including hardwood.


At Brolaws Construction, we typically use Dricore panels for basement subfloors due to their effectiveness in providing insulation and moisture protection.


Soundproofing: Enhancing Privacy and Comfort


If your renovation includes a basement apartment or a space where noise reduction is important, implementing soundproofing measures is essential. This may involve installing sound-dampening insulation and resilient channels to minimize noise transmission between floors. In many areas, such measures are required by building codes for basement apartments.


Budgeting: Planning for Your Investment


Open concept kitchen in basement apartment

Understanding the financial scope of your basement renovation is crucial. Costs can vary widely based on the project’s complexity and features:


  • Recreational Basements: Simple renovations can range from $40,000 to $80,000, while more elaborate designs with custom bars or home theaters may cost between $80,000 and $200,000.

  • Basement Apartments: These projects typically start around $100,000 and can increase depending on size and specific requirements.


Collaborating with a reputable contractor will help you develop a realistic budget and ensure that your vision aligns with your financial plan.


Compliance with Building Codes and Regulations


Adhering to local building codes is non-negotiable. Ensure that your contractor is knowledgeable about clearance requirements for utilities such as furnaces, water heaters, and electrical panels. Proper spacing is necessary for safe operation and maintenance of these units.


Close-up of white compact bathroom sink with soaps and towels displayed

Bathroom Considerations


Incorporating a bathroom into your basement renovation requires careful planning. While many unfinished basements have plumbing rough-ins, they may not be ideally located. Relocating plumbing can be costly, as it involves trenching through the concrete floor. Additionally, water lines should not be installed in exterior walls unless they are positioned on the interior side of the vapor barrier to prevent freezing.


Choosing the Right Contractor


The success of your basement renovation largely depends on selecting a credible contractor

Brolaws crew sitting on the front steps of a custom built house

who can bring your vision to life. Look for professionals with experience in basement projects, positive client testimonials, and a commitment to quality workmanship.


Embarking on a basement renovation is an exciting endeavor that can significantly enhance your home’s functionality and value. By carefully planning each aspect—from defining the space’s purpose to ensuring proper insulation and compliance with building codes—you can create a basement that meets your needs and stands the test of time.


Ready to get started on your basement renovation? If you are located in the Toronto, GTA, or Durham region of Ontario head over to our contact page to see if Brolaws Construction is the right fit for you.

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