Can I Build a Garden Suite? A 10-Point Self-Check Before You Call Anyone
Before you call a builder, walk your own yard with this 10-point checklist. It won't replace a proper feasibility review, but it will tell you what to expect from one.
Why Do This Yourself First
Every homeowner eventually needs a professional feasibility review before finalizing a garden suite project, but spending twenty minutes walking your own yard with a clear checklist first means that conversation starts from real information rather than a blank slate. This self-check won't replace the survey-backed, by-law-specific review a design-build team provides, but it will surface the major factors, lot size, access, trees, servicing, easements, that determine whether your project is straightforward, complicated, or needs more investigation, so you show up to that first call already understanding roughly what you're working with. Walk through the ten points below with a notepad, and you'll leave with a realistic first impression of your own lot.
1–2. Lot Size, Backyard Depth & Grading
Measure roughly how much clear backyard space exists behind your house to the rear property line, and note whether it looks like it could comfortably hold a rectangle in the rough range of a small garden suite footprint, generally somewhere within your municipality's size cap, often up to about 60 square metres in Toronto, with other GTA cities setting their own limits. A generous, roughly rectangular, level backyard is the easiest starting point. While you're back there, also note whether the ground is roughly level or slopes noticeably toward or away from the house; a visible slope isn't disqualifying, but it does mean foundation type and drainage planning deserve early attention, and a significant slope might even open up a walkout design opportunity worth discussing.
3–4. Side Yard Access & Servicing Distance
Walk both side yards and estimate the clear width between your house and the property line, accounting for existing fences, gas meters, AC units, and any landscaping. This width matters for two reasons: it determines whether standard or only compact construction equipment can reach the backyard, and in Toronto specifically, it's relevant to the roughly one-metre emergency access path requirement. A side yard under about two metres wide on both sides is worth flagging early. Also roughly estimate the distance water, sewer, and electrical service would need to travel from your main house's connection point, or from the street, to where the suite would sit; a longer trench run generally means higher servicing costs.
5–6. Trees & Existing Structures
Note the location and approximate trunk size of any mature trees in or near where a suite might go, both on your property and on neighbouring properties whose canopy or roots might extend toward your yard. A large tree, roughly thicker than a dinner plate at the base, anywhere near the likely build area is worth flagging, since it may trigger arborist review and could shape where the suite can sit. Also note any existing shed, detached garage, pool, or other structure in the yard, and consider whether it would need to be removed, relocated, or worked around, since existing structures reduce available buildable area and sometimes complicate setback calculations.
7–8. Easements, Lane Access & Heritage Status
Look for any above-ground clues to underground infrastructure, utility access covers, marked hydro or gas lines, or a strip of yard oddly restricted from fencing or planting by a previous owner, since these can hint at a registered easement, though a proper title search is the only reliable way to confirm one. Check whether your property backs directly onto a public laneway, since this single factor determines whether your project is technically a garden suite or a laneway suite, which fall under somewhat different municipal programs in Toronto. And check whether your property or neighbourhood carries a Heritage Conservation District designation, generally confirmable through your municipality's website or planning department, since it adds a design review layer worth knowing about from the outset.
9–10. Natural Features & Conservation Authority Exposure
Note whether your property borders, or sits reasonably close to, a ravine, creek, wooded valley, or floodplain, even if it's not immediately obvious from your yard. This can indicate you're within a conservation authority's regulated area, TRCA, CVC, LSRCA, NVCA, CLOCA, or another regional authority depending on your location, which adds a review process alongside your standard municipal building permit and can add real weeks to months to a project timeline. It's worth flagging even on a hunch, since the regulated area boundary is sometimes wider than it looks from ground level, and confirming it early avoids an unpleasant surprise once drawings are already underway and money has already gone into design work.
Turning Your Self-Check Into a Real Plan
If most of these points look straightforward, your project likely has a relatively clean path to feasibility, and a professional review will mostly confirm and formalize what you've already observed. If several points raised questions, a tight side yard, a large tree, a visible slope, that's exactly what a proper feasibility assessment is for, translating rough observations into precise numbers and a realistic path forward. Either way, this checklist is meant to make that first conversation more productive, not to replace it. Home Garden Suites offers a free, no-obligation feasibility assessment that covers all ten of these points and more, with a survey-backed, by-law-specific review of your actual lot, so you leave with real answers instead of estimates.
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