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Custom Home Additions in London & Kitchener, Ontario

If you love the bright, open feel of a sunroom but prefer the classic look of a traditional room addition, a custom home addition by Four Seasons Sunrooms offers the perfect solution.
Designed to blend seamlessly with your existing home, our additions combine timeless architectural style with expansive windows that fill the space with natural light. You’ll enjoy the comfort and functionality of a conventional room while benefiting from the bright, inviting atmosphere that makes sunrooms so appealing.
A custom home addition is an ideal way to increase your home’s living space without compromising its character. Whether you’re creating a family room, dining area, home office, or expanded living space, each addition is thoughtfully designed to complement your home’s architecture and provide a beautiful, lasting extension of your living space.
Benefits of Expanding Your Home in London and Kitchener
- Customizable Design
- Built with Traditional Materials & Modern Standards
- Seamless Integration with Your Home’s Architecture
- Energy Efficiency & Comfort
- Increase Your Home’s Value
- A Long-Term Solution






Make More Room for What Matters.
Expanding your home gives you the space you need without the hassle, stress, and cost of leaving the place you already call home.At Four Seasons Sunrooms & Additions, we can help transform that space into your dream space. Whether you’re looking to create a comfortable place to gather, make your home brighter and more functional, or simply have a space to relax and recharge, a thoughtfully designed addition can make all the difference.
Love your home with Four Seasons Sunrooms & Additions.
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Frequently Asked Questions About Home Additions
What’s the average cost of a home addition in London and Kitchener-Waterloo?
The average cost of a home addition is approximately $80,000.
How long does design, permitting and construction take in Southwestern Ontario?
The timeline for a sunroom project varies depending on the municipality and the scope of work. We work with municipalities across Southwestern Ontario, and permitting timelines differ from one municipality to another.
Do I need a municipal building permit in London or Kitchener?
Yes. A municipal building permit is required for a home addition in London or Kitchener.
What’s the difference between a traditional room addition and a Four Seasons sunroom addition?
A traditional room addition extends your home. A Four Seasons sunroom addition creates additional living space with a design focused on bringing more natural light into your home.
Can a home addition be fully integrated into existing heating, cooling and electrical systems for year-round use?
Yes. A home addition can be integrated into your home’s existing heating, cooling and electrical systems for year-round use. However, we recommend an independent heating and cooling source for the addition.
How do you handle site preparation, structural footings and zoning setbacks in local municipalities?
We take care of site preparation, structural footings and zoning setbacks as part of your home addition project.
What financing options are available?
Financing options are available through our partner, FinanceIT.
Why choose a specialized builder like Four Seasons over a general contractor?
We are an independently owned and operated, family-owned local business with over 35 years of experience serving Southwestern Ontario. Our specialization in sunroom systems gives us an understanding of the region’s design and installation requirements, including local building codes and snow loads.
We focus on proven local installations, sound technical details, clear warranty coverage and realistic project schedules. Our goal is to give homeowners confidence from design through completion.



