Here’s something we hear a lot from Burlington homeowners: “We love the neighbourhood. We just need more space.” The kids need their own rooms. The in-laws are moving in. The dining room has been doubling as an office since 2020 and everyone’s done with it.
So eventually they call us. The yard comes up pretty fast. How much of it are you willing to lose?
That usually starts the real conversation.
The Lot Question Decides More Than You’d Think
Burlington has real variety across its neighbourhoods. Roseland and Pinedale tend to have narrower lots with tight setbacks. Parts of Tyandaga, Millcroft, and Alton give you more room to work with. That difference is enormous when you’re figuring out whether to build up or build out.
On a tight lot, building out often isn’t a real option. Once you account for setbacks, lot coverage limits, and whatever you’re not willing to give up in the backyard, the numbers don’t leave much room to go horizontal. You go vertical instead. A second storey addition ends up being the only path that actually gets you the square footage you’re after.
On a bigger lot, you’ve got choices. And that’s when the lifestyle questions matter more: Do you want stairs? Are you staying in this house as you get older? Do the kids still need room to run around outside? Depending on your answers, a rear or side addition may serve you better than going up.
What a Second Storey Addition Gets You
Going up gets you what you need, whether that’s a couple of bedrooms, a primary suite, or a proper home office, without giving up any yard at all. For families in older Burlington neighbourhoods where the lot is already tight, this is usually the direction we end up going.
Fair warning though: second storey additions are not the easier path. Before anything gets built, an engineer has to assess your existing foundation. Most Burlington foundations are fine. Some need reinforcing. You won’t know which until someone looks.
Beyond the foundation, you’re dealing with a structural redesign. Trusses come out, load paths change, transfer beams go in. The framing phase is disruptive enough that most families need to arrange somewhere else to stay for a few weeks. And at some point in the planning you have to sort out where the stairs go, which turns out to have a much bigger impact on the main floor layout than most people expect.
None of that is a reason to walk away from it. It’s just what the process honestly looks like.
What a Rear or Side Addition Gets You
If the lot supports it, building out is usually the simpler route. The new section sits on its own foundation or screw piles without requiring the same kind of structural rework the existing house goes through with a second storey.
Rear additions are popular for families who want a bigger kitchen, a proper family room, or just a main-floor layout that actually flows. Side additions tend to work well for mudrooms, extra bedrooms, or laundry that’s been in the wrong spot for years. Sunrooms and four-season additions fit here too.
The cost is yard. You’re giving some up, and on a lot where that matters, it really matters. There’s also the city to deal with. Burlington has firm limits on how much of your lot can be covered and how close you can build to your property lines. In some zones those limits are tighter than homeowners expect.
Don’t Overlook the Views
From the right Burlington lot, a second storey opens up views that no rear addition is going to give you. Lake Ontario on a clear day. The Niagara Escarpment. Even just open sky above the treeline instead of staring into a fence. Not every Burlington property has this going for it, but when it does, it usually settles the question.
What About Doing Both?
We do this more than you might expect. Push the back of the house out 8 or 10 feet, build a second storey over part of what’s already there. You pick up space on both levels and keep the backyard. If you need room everywhere and the lot allows it, this is usually the direction we go.
What It Actually Costs in Burlington
In 2026, rear and side additions around Burlington are landing somewhere between $400 and $650 a square foot. Second storey projects tend to run a bit more, usually $450 to $700. Doing both? Figure somewhere in the $475 to $725 range. Finishes, structural complexity, and the condition of the existing house all pull those numbers in different directions.
The engineering overhead is what pushes second storey costs up. On a small lot where building out isn’t realistic anyway, that comparison doesn’t mean much.
Permits, Zoning, and Burlington’s Bylaws
Either way, you’re pulling a permit. Burlington’s zoning bylaws get into lot coverage, setbacks, height limits, and floor space ratio. And they’re not the same everywhere. One block can have different rules than the next.
Knowing what your lot actually allows before you start designing saves a lot of backtracking. We do a pre-design review for exactly this reason.
Talk to Catlin
We’ve been doing this work in Burlington and the surrounding area (Hamilton, Ancaster, Oakville, Waterdown, Dundas) for over 15 years. Rear extensions, full second storey additions, and the more complicated projects that combine both.
If you’re trying to figure out the right move for your home, give us a call at 289-427-1092 or visit catlin.ca. We’ll give you a straight answer.