Additions · Toronto & the GTA
Home Additions in Toronto & the GTA
Rear additions, second storeys and bigger kitchens and family rooms, built to blend with the home you already have. One family-owned team handles the design, engineering, permits and every trade, with a dedicated project manager from the first sketch to the final walkthrough.
- 5.0★on Google
- Best of 2024HomeStars
- Since 2015Family-owned
- LicensedInsured & WSIB-covered
Why J Group
More Space Without Moving
An addition gives you the room you need on the street you love. It's also the most complex project in residential construction: structure, zoning, permits, mechanical systems and a roof line that has to look like it was always there. We plan all of it before the first shovel goes in.
- Design, engineering and permits handled: drawings, structural engineering, the building permit and any zoning approvals
- A dedicated project manager on every job, from the first visit to the final walkthrough
- Built to match: brick, siding, windows and roof lines that blend with your existing home
- Licensed trades for plumbing, gas, electrical and HVAC, done to code
- A clear quote before any work starts, and a written 2-year workmanship warranty
What clients say
"I haven't had many great experiences with contractors in the past, and I have bought and flipped 11 homes in the GTA. J Group is by far the most professional, transparent and accountable team I have ever worked with."Marc A.Has bought & flipped 11 GTA homes
What we build
Home Addition Services
From a kitchen bump-out to a full second floor.
Rear additions
Family rooms, larger kitchens and main-floor suites built out the back of your home.
Second-storey additions
A new floor over your bungalow or a partial second storey, with bedrooms, an ensuite and a new staircase.
Over-the-garage additions
Bedrooms, offices or a guest suite built above an attached garage.
Kitchen bump-outs
A few extra feet that make room for an island, a pantry or a breakfast nook.
In-law and main-floor suites
A bedroom and accessible bathroom on the main floor for parents or for aging in place.
The rooms inside
New ensuites, kitchens and living spaces finished to the same standard as our renovations.
Planning & permits
What an Addition Needs Before It Can Be Built
Every addition in Ontario needs a building permit. Most also need some combination of these, and we take care of each one:
- Zoning review: setbacks from the lot lines, lot coverage, height and floor area. We check your lot's zoning at the start.
- Minor variances: if the design goes beyond what zoning allows, it goes to your city's Committee of Adjustment first, which can add a few months.
- Structural engineering: foundations, beams and framing for the new space, and for a second storey, a check that your existing foundation can carry the extra load.
- Mechanical upgrades: more space can mean a bigger furnace or air conditioner, new ductwork, or an upgraded electrical service.
- Trees, ravines and heritage: protected trees, ravine areas and heritage properties have their own permits. We check before design begins.
How it starts
In-Person Consultation
$199
Credited in full toward your project. We walk your home and lot, talk through what's possible, budget and timing, and give you a measured floor plan report to start the design from.
Transparent pricing
What a Home Addition Costs
Every addition is different. Here's where full-service projects start in Toronto and the GTA, before HST, including design, engineering drawings and permits. Try our cost estimator →
Ground-floor or rear additions
From $275/sq ft
A 300 sq ft family-room addition usually lands between about $85K and $150K, depending on the foundation, the finishes and what's inside.
Second-storey additions
From $325/sq ft
Includes taking off the roof, new framing and a new staircase. Bathrooms and kitchens inside the new space add to the cost.
What moves the price
- Foundation and structure: a full basement under a rear addition costs more than a crawlspace or slab, and older foundations may need reinforcing for a second storey.
- Kitchens and bathrooms: plumbed rooms cost more per square foot than bedrooms and living space.
- Matching the exterior: brick, stone and custom windows that blend with the existing home add to the budget.
- Approvals: minor variances, engineering and tree or ravine permits add drawings, fees and time.
Reviews
GTA Homeowners Trust J Group
"J Group was phenomenal to work with from start to finish. AJ supported us through the entire process and each and every trade he brought in was equally great. Trustworthy, honest, diligent and quality workmanship."Melissa O.Home renovation
"Thanks to J Group's exceptional work, the renovations on my house in Thornhill exceeded my expectations… I wholeheartedly recommend J Group Renovations to anyone looking for a contractor who will go above and beyond."Danial Z.Thornhill · Home renovation
"I had the privilege of working with contractors J Group to renovate my house in Vaughan, and I must say that my experience was nothing short of exceptional. AJ's professionalism and attention to detail is unmatched. Highly recommend."Ali B.Vaughan · Google review
How it works
How a Home Addition Works With Us
Consultation
$199 in-person visit, credited in full toward your project. We walk your home and lot, talk through what's possible, and give you a measured floor plan report.
Design & quote
Layout, exterior and finishes, then a clear quote and a realistic schedule before any work starts.
Engineering & permits
Structural drawings, the building permit and any zoning approvals. This usually takes about 2 to 4 months.
Build
A dedicated project manager, licensed trades, a protected and tidy site, and regular updates. Most additions take about 4 to 8 months to build.
Walkthrough & warranty
We don't call it done until you do, and our written 2-year workmanship warranty backs the work.
Questions
Home Addition FAQ
How much does a home addition cost?
Full-service additions start from about $275 per square foot for a ground-floor or rear addition and about $325 per square foot for a second storey, before HST, including design, engineering drawings and permits. A 300 sq ft family-room addition usually lands between about $85,000 and $150,000. You get a clear quote after your consultation.
Do I need a permit for an addition?
Yes. Every addition in Ontario needs a building permit, with structural drawings and inspections along the way. We prepare the drawings and handle the permit.
What is a minor variance, and will I need one?
If your addition goes beyond what your lot's zoning allows, for example closer to a lot line or bigger than the allowed floor area, it needs a minor variance from your city's Committee of Adjustment before a permit can be issued. We check your zoning first and design to avoid one where we can.
Can my house support a second storey?
Often, yes. A structural engineer checks your existing foundation and framing first. Some homes need reinforcing before a second storey can go on, and we include that in the plan and the quote.
How long does an addition take?
Plan for about 2 to 4 months of design, engineering and permits, then about 4 to 8 months of construction, depending on the size and any approvals. You get a realistic schedule with your quote.
Can we live at home during the addition?
For most rear additions, yes. We keep the work area sealed off from the rest of the house. A second storey means some work with the roof open, so we coordinate living arrangements with you ahead of time, including whether and when you might want to stay elsewhere.
Is an addition better than moving?
Often it is, if you love your neighbourhood. An addition avoids land transfer tax, realtor fees and moving costs, and gives you space designed around how you live. We help you compare at the consultation.
What does the $199 consultation include?
An in-person visit, an honest conversation about budget and feasibility, and a measured floor plan report of your space. The $199 is credited in full toward your project.
Request Your Addition Consultation
Tell us about your home and the space you need. $199, credited in full toward your project. We respond within one business day.
Building new instead? See custom homes, or all the areas we serve.