Home Additions in Toronto & the GTA
Jash Design & Build is a top design-build firm specializing in high-end Toronto home additions for large and luxury residential properties. We have over 15+ years of success in the industry, making us one of the most experienced home addition contractors in the GTA. We walk you through the possibilities and options to deliver you the addition you seek.
We Build Home Additions in Toronto & the GTA
At Jash Design & Build, we design and build Toronto home additions with passion. We only work with the most highly reputable and experienced tradespeople who are truly dedicated to their trade.
Our motto is “Do it right the first time” because we believe when you do good work, you’ll always have work.
More than quality craftsmanship, we’re dedicated to improving the entire client experience. We believe in educating and informing our clients through full transparency and clear communication for the home addition you envision. This means if your plans are not feasible, we’ll tell you and present to you the best options. You never have to worry unnecessarily because our team will competently answer every question you have.

What Our Trusted
Clients Saying
Highly rated by homeowners and property owners across the GTA.



Types of Home Additions We Build in Toronto & the GTA
Home additions come in all shapes and sizes. From room extensions to second-floor additions, we craft one-of-a-kind spaces with premium materials and stunning finishes. Explore the details of each of our addition services here:

Second Story Addition
We handle second-floor additions from start to finish. This includes permit acquisitions, main floor protective coverings, architectural and engineering drawings, mechanical work, interior design, etc. Size is no issue as we design and build additions with 1,000+ sq ft.

Back House Room Additions
Extend your home with one or more room additions. We handle the structural and foundation work in addition to exterior and interior designs. You can select from a range of materials to match or coordinate with your existing interior and exterior design elements.

Room Additions
We expand existing rooms as well as build new rooms of varying sizes both upwards and outwards. We’ll take care of everything, including installing required electrical and plumbing systems, insulation, roofing, siding, windows, and doors.

Four-Season Room Additions
We design and construct four-season room additions with an innovative, design-forward mindset. We handle the whole project from the planning and design stages to demolition, construction, and inspections. As part of our design-build delivery method, we’re also responsible for permits, zoning compliance, and foundation work.

Kitchen Extensions
Our team plans, designs, and constructs functional kitchen extensions with on-site sketches, required permit submissions, and high-quality materials. We deliver a controlled demolition with dust protection, followed by dedicated project management, and licensed trades delivering a layout and appearance that effortlessly integrates with your home.

Bathroom Addition
We use licensed plumbing and electrical tradespeople to guarantee safe installations, proper ventilation, lighting, and code-compliant systems. With innovative moisture control systems, waterproofing, and premium fixtures, we protect your investment. We promise improved comfort and functionality through a luxury bathroom addition designed for long-term reliability.
Home Addition Process in Toronto & the GTA
Our Toronto home addition process follows a clear design-build structure. Each phase emphasizes coordination, code compliance, quality control, and efficient execution. Review each step here:
Why Choose Us for Home Additions in Toronto
From custom homes and additions to commercial renovations, every project is managed with attention to detail from start to finish.

Featured Projects
See how Jash Design & Build creates more room for growing families through planned home additions, structural work, layout improvements, and carefully connected new living spaces.
LYNVALLEY HOME ADDITION
MARYVALE CUSTOM ESTATE
THE ARNOLD ESTATE
What is the Cost of a Full Home Renovation
in Toronto & the GTA?
The cost of full home renovations depends on the project scope of work. At Jash Design & Build, we have a minimum $100,000 service fee as we follow a complete design-build delivery method. Following our onsite consultation, we’ll provide a detailed estimate based on your project scope.
FAQs About Home Additions
We can answer any and all questions you have regarding our services and company standing. Take a look below to explore answers to some of our most frequently asked questions.
Serving the Greater
Toronto Area
We serve the residents and businesses of Toronto and the GTA. Our service area extends beyond the inner city into the surrounding communities. Here is a list of the areas we serve:
- Toronto
- North York
- Vaughan
- Richmond Hill
- Etobicoke
- Mississauga
- Oakville
- Aurora
We also work with clients throughout surrounding GTA communities. If you’re unsure whether we service your area, feel free to reach out.
Start Your Home Addition Project in Toronto Today
Build your dream Toronto home addition with a contractor that knows how to get the job done right the first time. From room extensions to second storey additions, our team is equipped to plan and design the home addition you deserve. Contact us today to book a consultation.






