Expanding Your Space: Step-by-Step Guide for Adding an Addition to Your House in Southern Ontario

new home addition being built



When you’ve outgrown your current living space, the strategic solution is adding an addition to your house.

In this comprehensive guide, we’ll walk you through the essential steps and considerations for expanding your home in Southern Ontario, including typical square footage costs ( anywhere from $200 – $400 per sq’), ensuring a seamless and valuable addition to your living space.

1. Evaluate Your Needs and Goals:

Understand Your Space Requirements
  • Identify specific needs prompting the addition, such as a larger kitchen, an extra bedroom, or a dedicated home office.
  • Clearly define your goals to guide the planning process effectively.

2. Assess Local Zoning and Regulations:

Navigate Legalities
  • Check local zoning laws and building regulations specific to Southern Ontario to ensure compliance.
  • Obtain necessary permits and approvals before starting construction to avoid legal complications.
Zoning Regulations:

3. Set a Realistic Budget:

Financial Planning
  • Determine a realistic budget based on the scope and scale of the addition, considering typical square footage costs in Southern Ontario.
  • Factor in construction costs, permits, design fees, and potential unexpected expenses.

Typical Square Footage Costs in Southern Ontario:

  • The average square footage costs for a house addition in Southern Ontario typically range from $200 to $400 per square foot. Keep in mind that these costs can vary based on factors such as location, materials, and the complexity of the project.

4. Hire a Professional Design Team:

Bring Your Vision to Life
  • Engage with architects and designers familiar with the Southern Ontario building landscape to create detailed plans for your addition.
  • Consider their expertise to optimize space, functionality, and aesthetic appeal.

5. Choose the Right Contractor:

Find an Experienced Builder
  • Select a reputable contractor with experience in home additions in Southern Ontario.
  • Check references, view past projects, and ensure they are licensed and insured.

Consider reaching out to The Innovative Group in St. Catharines as a suggested experienced builder for your addition project.

6. Design and Approve Detailed Plans:

Finalize Architectural Drawings
  • Collaborate with your design team to refine and finalize architectural drawings, considering local building codes.
  • Seek necessary approvals from local authorities based on the detailed plans.

7. Begin Construction:

Breaking Ground
  • Once permits are secured and plans are approved, construction can commence.
  • Monitor the process closely to ensure adherence to the established timeline and quality standards.

8. Regular Inspections:

Quality Assurance
  • Schedule regular inspections to ensure construction aligns with the approved plans.
  • Address any issues promptly to maintain project momentum and quality.

9. Finalize Interior Finishes:

Bring Your Addition to Life
  • Work on interior finishes, including flooring, paint, and fixtures, to align with your design vision.
  • Ensure a cohesive transition between the existing structure and the new addition.
Flooring Suggestions:

10. Landscaping and Exterior Finishing:

Complete the Look
  • Enhance curb appeal by landscaping around the new addition, considering Southern Ontario’s unique climate.
  • Finish exterior details to ensure a seamless integration with the existing structure.


Adding an addition to your house in Southern Ontario involves careful planning and execution, including considerations for regional square footage costs.

By following these steps and staying involved in the process, you can ensure a successful expansion that not only meets your current needs but also adds long-term value to your home.

    Have A Question?

    Frequently Asked Questions?

    If you decide to tear down and build new you will be subject to new set-back bylaws that could mean your home will have to be smaller or not situated on the lot the same as the original home.

    Typically renovations can be less expensive than building new, but this depends on the type of upgrades you choose and how much you decide to renovate. You may start out with a budget to renovate the kitchen and bathrooms but later decide to include living spaces which will increase your budget depending on the quality of upgrades.

    When choosing to renovate or build new look ahead 10-15 years. Is your family size going to change? Do you plan on living in the home for the next 30-50 years? A quality renovation and proactive design and planning could make this your forever home or a great investment.

    The Innovative Group is here to advise you on whether a renovation or new build is your best choice. Our knowledge and experience in the construction industry gives us the ability to help you understand how your decision will affect your home’s current and future values in the local market.

    This depends on the size of the renovation. Many large renovations can be done room by room, but this could leave you without a kitchen or bathroom for a period of time. An unoccupied home allows for a faster completion timeline.

    The Innovative Group strives to be as discrete and non-invasive as possible. We pride ourselves on having professional, efficient and respectful trades and staff.

    Cost is always dependent on many factors but The Innovative Group will work closely with you to work within your budget.

    It’s important to agree upon a scope of work and how you want to handle unexpected costs. We use transparent billing and open communication to ensure spending is on track.
    Try our Cost to build Calculator
    cost to build calculator

    We are here to help you understand how long projects could take. Working with a designer, an architect, an engineer and applying for city permits can take a few months but if you involve your builder from the beginning we can help lay out a timeline and schedule.

    We recommended consulting a designer once you’ve decided what work you want to do. They can help you decide if a renovation is worthwhile based on your needs. Designers will create sketches and plans based on your input and ensure you have included all the required details.

    We work closely with engineers, interior designers and architects to ensure your project is of the highest quality and meets all your expectations and needs.

    All our project sites have liability insurance for the construction work being done. We recommend you notify your home insurer about the work you are having done including the scope and timeline. Also, check our detailed post about “The Ultimate Guide to Renovation Insurance

    Our relationship and knowledge of city hall means we can arrange all the required permits and inspections for your project accurately and efficiently.

    Scroll to Top