Detached Garage – Welland | Custom Accessory Structure Design
Residential — Welland, Ontario
At De Simone Designs, we believe your home should grow with you. Our additions and renovation services are designed to expand and enhance your living space, making it functional, beautiful, and aligned with your evolving needs. Whether you’re looking to add a new room, upgrade your layout, or reimagine your entire home, we bring skill, creativity, and careful planning to every step of the process.
Expand your home with thoughtfully designed additions that enhance both space and functionality.
Reimagine existing spaces with updates that improve flow, aesthetics, and overall usability.
Transform your layout into a more open, efficient, and modern living environment.
Ensure all new and existing elements come together cohesively with fully compliant permit-ready drawings.
Your vision is at the heart of everything we do. We take the time to understand your needs, preferences, and goals, ensuring that the final design reflects your unique story.
We prioritize quality and creativity, crafting spaces that are both functional and inspiring. Every project balances innovation with timeless design principles.
Adhering to the Ontario Building Code (OBC) is non-negotiable. Our work meets and exceeds regulatory standards to ensure safety, efficiency, and lasting val.
Registered Architectural Technologist with Association Architectural Technologists of Ontario
Fully Insured and BCIN Certified by the Ontario Ministry of Municipal Housing & Affairs
Gold Winner of the CommunityVotes Niagara Region 2026
At De Simone Designs, we transform ideas into spaces that inspire. Specializing in custom homes, cottages, multi-unit residences, and commercial design, our services are built on client-centered values, design precision, and a commitment to quality. From initial planning to permit-ready plans, we handle every detail, making your vision a reality.
We start with an in-depth consultation to understand your goals, preferences, and the purpose behind your renovation or addition. By exploring your lifestyle, budget, and vision, we set a strong foundation for a successful project that meets and exceeds expectations.
Once we understand your needs, we’ll create preliminary design concepts that bring your ideas to life. Our team will consider everything from structure and flow to natural lighting, finishes, and style, ensuring a cohesive plan that integrates perfectly with your existing space.
Our additions and renovations aren’t just about building—they’re about blending. We coordinate with top engineers, planners, architects, interior designers, and contractors, managing all aspects of the project to ensure smooth transitions, compliance, and quality control. We also liaise with municipal departments to guarantee that your project meets Ontario Building Code (OBC) standards.
Our goal is to create additions that feel like an organic part of your home. We work to harmonize the new and existing elements, from the structural framework to aesthetic details, providing seamless connections between old and new spaces.
At De Simone Designs, we specialize in a variety of architectural services, including custom home design, multi-unit dwellings, renovations, additions, and commercial design. We also provide consulting on zoning, variances, and permit processes, ensuring your project complies with all local regulations.
The first step is to schedule a consultation with us, where we’ll discuss your vision, budget, and any specific requirements. From there, we’ll help guide you through the design process, including conceptual planning, drafting designs, and obtaining permits. Our team works closely with engineers, contractors, and municipal departments to ensure a smooth process.
Yes, we handle all aspects of the permit and zoning process. Our team is experienced in managing zoning reviews, variances, rezoning, and other municipal requirements, making sure your project adheres to all local regulations and guidelines.
Absolutely! We collaborate closely with contractors to ensure that your design is implemented to the highest standard. Our team works seamlessly with your chosen contractor to ensure your vision is realized within your budget and timeline.
We worked with Thomas for our custom cottage project. His creativity, thought-out plans and dedication to creating a great design truly exceeded our expectations. From the initial consultation to the final result, Thomas was professional, knowledgeable, and truly passionate about his work. He listened to our ideas and brought them to life. If you are looking for an architectural design firm that will go above and beyond to create your dream space, look no further than De Simone Designs. Thank you for making my dream summer cottage a reality!
C & J Keast – Crystal Beach, ON
We used De Simone Designs for a rear addition project to our existing home. We were very happy with the great design, but even happier that they also kept us within our budget. Thomas worked out all the tricky construction details, which was a huge relief for first time renovators navigating the world of construction. His attention to detail and ability to balance aesthetics with practicality was truly impressive. What stood out the most to me was his willingness to guide us throughout the entire process. As someone who is not well-versed in architectural design or construction, I appreciated his expertise and his ability to explain things in a way that was easy to understand. He truly made the entire experience stress-free and enjoyable. I highly recommend this firm to anyone in need of an architectural designer.
F & P Roveda
It was a pleasure working with Thomas at De Simone Designs. We appreciated his fun approach to construction and design, as well as all the energy and work he put in to our detached garage project. The added space for my wife’s art studio on the second floor was amazing touch we hadn’t initially thought of. We were very pleased with this professionalism and the quality of his work. He presented different design options and took the time to review different colour options for the exterior. His professionalism, creativity, and commitment to his clients is truly unmatched.
M & J Quevedo – Niagara Falls, ON
I contacted Thomas for the plans for a renovation of my basement to add a new secondary apartment; I couldn’t have been happier with the results. His expertise in building and city codes was evident throughout the entire process, ensuring that all aspects of the design were up to standard. I was impressed by his office’s detailed drawings, which were not only aesthetically pleasing but also had a practical and functional layout. Thomas’ friendly and fun demeanor helped make this an enjoyable process. I will always recommend him.
D Pitt – Hamilton, ON
Residential — Welland, Ontario
Residential — Niagara on the Lake, Ontario
Residential — Welland, Ontario
Not sure which service is right for your project? Our team is here to help. Get in touch and we’ll walk you through your options and next steps with clarity and confidence.
