We Construct Sunrooms, Patio Covers, Railing Systems as well as Additions. We do it all, the choice is yours.
We have the answer, add an addition to your home? At Designer Sunrooms and Additions we specialize in major home renovations; Main floor additions- family rooms, great rooms and kitchens. Our free consultation will help determine whether you home qualifies for an addition. We provide a complete hassle-free home addition service- We deal with the planning department for minor variances and zoning restrictions, so you don’t have to! We have experience dealing with appeals or zoning rulings with the Ontario Municipal Board.

Owner of Designer Sunrooms and Additions, John Witten and his team share a passion for residential building. John wanted to establish a benchmark in the industry for good quality home improvements.  It is the industry experience that John has attained that makes Designer Sunrooms and Additions the right choice for your addition project.

John started in home improvements in 1972.  He has operated a dealership for a manufacturing and installation company.  Here are just some of the credential that John Witten has attained so far;

  • Past vice president of the Hamilton- Halton Home Builders Association
  • Past president of SAWDAC (sliding and window dealers association of Canada) and one of the founding members of this nation wide organization
  • Past committee member of Hamilton education co-op program- a joint Mohawk college/ Hamilton board of education project
  • Seminar presenter/ speaker for the following organizations;
      – Hamilton/ Halton Home Builders Association
      – B P Dealership Network
      – IDEA Show Production
  • Certification for sales and installation for the following sunroom manufacturers;
      – Better Living Patio Rooms
      – Temo Sunrooms
      – Sunspace Sunrooms 
  • Member of the Burlington Chamber of Commerce
  • For 5 years managed Beverly Hills Home Improvements sunroom division
  • Has obtained great knowledge in dealing with minor variance and OMB issues


John and Dan looked after the building of a screened sunroom addition to our home in 2017 and we have been enjoying it ever since. Our project was challenging as we live in a freehold townhouse in south Oakville and our dreams meant that a variance request had to be drawn up, submitted and approved. John handled it all. The project also had narrow access to the rear yard and a complicated roof structure amongst other challenges. John gave us a quote and the project was done in budget. Dan did a tremendous job with his team in completing this beautiful room and keeping the worksite clean in the process. We visited a couple of John’s clients previously and each said, “We live out here”. Well, add us to the list. The project included a small deck with steps and reworking some of the patio around the room. It all looks wonderful and has made all the difference in our enjoying our “downsized” home. I highly recommend a screened room for people who want to enjoy the outdoors and control their exposure to pests and the sun. We are retired but it would be great for small children and our grown kids love it too. A very relaxed place to kick back over a bbq’d meal, glass of wine or just to chat with family and friends – we even used it for Thanksgiving dinner overflow! I also love to paint in the sunroom as the light is perfect.

Thanks and congratulations to the team – this has so enhanced our lives!

Joan Johannson




Our experienced team handles everything from design and permits to construction and finishing touches, ensuring a stress-free experience for you. We’re committed to making your dream sunroom a reality, while you sit back, relax, and enjoy the journey of transforming your home.

Our experienced team handles everything from design and permits to construction and finishing touches, ensuring a stress-free experience for you. We’re committed to making your dream sunroom a reality, while you sit back, relax, and enjoy the journey of transforming your home.


At Designer Sunrooms and Additions, we take immense pride in offering the epitome of high-end quality in every product we use. Our commitment to excellence is evident in our meticulously selected materials, which are sourced to not only meet but exceed industry standards. From premium-grade glass panels that flood your sunroom with natural light while maintaining energy efficiency, to top-tier construction materials that ensure structural integrity and longevity, we spare no effort in delivering superior craftsmanship. When you choose Designer Sunrooms and Additions, you’re choosing a level of quality that not only enhances your home’s aesthetics but also guarantees durability, functionality, and enduring value. Your satisfaction is our priority, and we believe that using the finest products is the foundation of creating exceptional spaces that stand the test of time.

We are more than happy to go over and brainstorm your project with you during our free consultation!



At Designer Sunrooms and Additions, we pride ourselves on delivering an unparalleled level of service that is both fast and over-the-top in every aspect. Our dedicated team understands the urgency of your home transformation project, and we’re committed to exceeding your expectations at every turn. From the moment you reach out to us, our responsive customer support team will ensure that your inquiries are promptly addressed. Our streamlined processes guarantee swift project initiation, and our experienced professionals work tirelessly to complete your sunroom or addition project efficiently, without compromising on quality. We are passionate about going above and beyond to provide you with not just a space but an experience that reflects your vision and enhances your lifestyle.

Choose Designer Sunrooms and Additions for a service that’s as exceptional as the spaces we create. Your satisfaction is our top priority, and we’re dedicated to making your dream space a reality in record time.

Designer Sunrooms and Additions service area includes: Burlington, Oakville, Hamilton, Grimsby,

Mississauga and Southern Ontario

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