By Rahul Kumar, HCRA-Licensed Custom Home Builder & Real Estate Broker · Golden Brick Homes · October 2026 · 8-minute read
Two lots, identical area, different shape. One is wide and shallow, the other narrow and deep. Buyers argue about this constantly, usually on instinct. The by-law settles most of it, and the answer surprises people.
Here is the short version: the shape of your lot does not change how much house you are allowed to build. It changes where that house can sit, how much yard is left behind it, and how good the floor plan can be. Those are not small things, but they are different things.
What the by-law keys to, and what it ignores
Under By-law 2026-088, two standards run on lot area alone:
- Residential floor area ratio — a percentage set by bands of lot area. Nothing about shape enters it.
- Maximum lot coverage — 35% in R3, flat.
One standard runs on frontage:
- Interior side yards — set by Table 6.6.1, in bands, by how wide your lot is at the street.
And two do not move with shape at all: the minimum rear yard is a flat 24 ft 7 in (7.5 m) in R3, and the minimum front yard for a vacant or newly created lot is also 24 ft 7 in (7.5 m).
That combination produces the result most people guess wrong.
Table 6.6.1: side yards by frontage
This is the table that does the work, reproduced from the enacted by-law. Note that it has two columns — the garage decision changes the answer.
| Lot frontage | Attached garage | Detached garage, or no garage |
|---|---|---|
| 98 ft (30.0 m) and above | 9 ft 10 in (3.0 m) each | 9 ft 10 in (3.0 m) each |
| 82–98 ft (25.0–30.0 m) | 7 ft 10 in (2.4 m) each | 7 ft 10 in and 9 ft 10 in |
| 66–82 ft (20.0–25.0 m) | 7 ft 10 in and 5 ft 11 in | 7 ft 10 in and 9 ft 10 in |
| 49–66 ft (15.0–20.0 m) | 5 ft 11 in (1.8 m) each | 5 ft 11 in and 9 ft 10 in |
| Under 49 ft (15.0 m) | 3 ft 11 in (1.2 m) each | 3 ft 11 in and 9 ft 10 in |
Read it once and the logic is clear: a wider lot gives up more of its width to side yards. A narrow lot keeps proportionally more.
Worked example: both lots at 8,000 sq ft
Both are R3-0. Both have an attached garage. Both are vacant lots, so the front yard is 24 ft 7 in (7.5 m).
The numbers
| Wide and shallow | Narrow and deep | |
|---|---|---|
| Lot | 79 x 102 ft (24.0 x 31.0 m) | 59 x 136 ft (18.0 x 41.3 m) |
| Side yards given up | 13 ft 9 in (4.2 m) | 11 ft 10 in (3.6 m) |
| Buildable width | 65 ft (19.8 m) | 47 ft 3 in (14.4 m) |
| Buildable depth | 52 ft 6 in (16.0 m) | 86 ft 3 in (26.3 m) |
| Buildable envelope | 3,410 sq ft | 4,076 sq ft |
| Maximum floor area | 3,924 sq ft | 3,924 sq ft |
| Rear yard depth | 47 ft (14.3 m) | 69 ft 3 in (21.1 m) |
| Rear yard area | 3,694 sq ft | 4,088 sq ft |
The narrow lot wins on both counts. It has the larger buildable envelope, because side yards scale with frontage while front and rear yards do not. And it has the deeper, larger rear yard, because the house sits in a longer lot.
Both permit exactly the same 3,924 sq ft of floor area. Neither shape buys you more house.
Why the backyard argument usually gets it backwards
The common assumption is that a wide lot gives you a better yard, because the yard is wide. It does not work out that way.
Depth is what makes a yard usable. A pool, a patio and a stretch of lawn need room front to back, not just side to side. On the shallow lot, the total is fixed: front yard plus house plus rear yard can never exceed 102 ft. You are carving a strip.
A pool fits on both. On the deep lot it fits comfortably with lawn to spare. On the shallow one you are fitting it into a band, and it ends up running parallel to the house with little room in front of or behind it.
The constraint nobody mentions: soft landscaping
This is the rule that actually decides whether a pool works, and it rarely comes up.
R3 requires a minimum residential soft landscaping area of 35% of total lot area, and 45% of the front and flankage yard. On an 8,000 sq ft lot that is 2,800 sq ft that cannot be building, driveway, patio or pool deck.
Subtract a 1,962 sq ft footprint and you have roughly 3,240 sq ft left for every hard surface on the property — driveway, walkways, patio, pool and its surround. That is workable on a lot this size. On a smaller lot it is the first thing to bind, and it is why pools get cut from plans late.
The front yard rule also hands the wide lot a genuine advantage: more permitted driveway and parking width. On the wide lot you may harden about 1,066 sq ft of front yard; on the narrow one, about 799 sq ft.
The garage decision costs you width
Look again at Table 6.6.1. With a detached garage or no garage, one side yard jumps to 9 ft 10 in (3.0 m) in every band from 49 ft of frontage upward.
Run the example again with a detached garage and the envelopes become 3,203 sq ft wide and 3,737 sq ft narrow. The narrow lot still wins — the conclusion holds either way — but both lose width.
So the garage is a real decision with numbers on both sides. Attached: narrower side yard, more buildable width, but the garage floor counts against your 3,924 sq ft. Detached: floor area stays free, but you surrender 3 ft 11 in on one side.
So what is actually worse about a narrow lot?
The house itself. That is the honest answer, and it has nothing to do with the yard.
47 ft 3 in of buildable width against 65 ft. Put a double garage into 47 feet and you have roughly 27 feet of frontage left for living space on the main floor. Every plan gets compromised by that — the entry, the sightline through the house, where the stair lands.
And a house 47 ft wide by 42 ft deep has a core more than 23 feet from any exterior wall. It goes dark in the middle. Fixing it means skylights, a light well or an interior courtyard, all of which cost money and consume floor area you have already capped.
What a shallow lot actually costs you
Here is the part that gets missed. Frontage is what people pay a premium for — a wider elevation, more street presence. But the elevation is not the floor plan, and on a shallow lot a wide frontage does not rescue you.
Lot depth is a budget. The front yard is fixed. Whatever is left splits between how deep your house can be and how much back yard you keep. Every foot you add to one comes out of the other.
A well planned two-storey wants roughly 36 ft of depth: a garage bay at about 22 ft, or a front room, a circulation spine, and a rear room deep enough to hold a kitchen and family space across the back. Go much under that and the rooms behind the front wall get shallow — bedrooms that measure well on paper but read as corridors, a kitchen with no room for an island and a table.
And a pool with its surround and circulation wants about 40 ft of yard depth to sit properly rather than being wedged in.
Add those up with the front yard and you get a working threshold:
| Lot depth | House 36 ft deep leaves | What that yard supports |
|---|---|---|
| 90 ft | 29 ft of rear yard | Patio and lawn. A pool is a squeeze. |
| 102 ft | 41 ft of rear yard | Pool fits, comfortably. |
| 136 ft | 75 ft of rear yard | Pool, lawn, and room to spare. |
Below roughly 100 ft of depth, you start choosing. You can have the deep house or the usable yard, not both. Above it, the question stops binding and the trade-offs move back to width.
So the buyer paying a premium for 79 ft of frontage on a 90 ft deep lot has bought a handsome elevation and given up the back yard, or given up room depth to keep it. The same money on a 59 ft frontage at 136 ft deep buys a narrower face and a property that does both.
Which lot is actually better?
It depends on which problem you would rather have, and the honest answer has a threshold in it.
| Wide and shallow | Narrow and deep | |
|---|---|---|
| Permitted floor area | Identical — set by lot area | |
| Main floor width | Better. Room for a double garage and real living space beside it. | Tight. A double garage eats half a 47 ft frontage. |
| Natural light | Better. Shallow plan, most rooms on an exterior wall. | Risk of a dark core needing skylights or a light well. |
| Room depth | Constrained if the lot is under about 100 ft deep. | Unconstrained. Depth is the one thing you have. |
| Back yard | Fixed and shallow. Pool is tight under 100 ft of depth. | Better, and you choose how much to keep. |
| Street presence and resale | Better. Frontage is what buyers pay for. | Weaker, whatever the interior does. |
| Severance potential | Better, if frontage clears the minimum twice over. | Usually none. |
If the shallow lot is 100 ft deep or more, buy the width. You get the better house and the stronger resale, and the yard still works.
If it is under 100 ft, the width is a trap. You are paying a premium for elevation on a lot that cannot give you both a properly proportioned house and a yard worth having. The narrow deep lot will build better, live better, and cost you only on the day you sell.
The market view
Frontage is what buyers pay for. Between two lots of identical area, the wider one almost always sells higher. Street presence and house width drive perceived value far more than total square footage does, and that holds for the finished home as much as the land.
Frontage is also the gate on severance. R3 sets a minimum of 49 ft (15.0 m), and a lot below it is existing non-conforming, which constrains what you can do with it later.
The summary. Wide and shallow buys you a better house and a stronger resale position. Narrow and deep buys you a better yard and a slightly larger envelope. Neither buys you more square footage, because the by-law does not work that way.
Three things that will move these numbers on a real lot
- Front yard, if the lot is not vacant. The 24 ft 7 in figure applies to a vacant lot on the effective date or a newly created lot. On an existing lot, Section 6.6 a) sets the minimum front yard as the lesser of the yard legally existing on 25 February 2014 less 3 ft 3 in (1.0 m), or the average of the two neighbouring yards. On an established street that moves everything.
- Zone. This is R3. The frontage bands are the same across the Residential Low zones, but minimum lot areas, coverage and the floor area bands differ. R1 and R2 also carry a maximum dwelling depth of 65 ft 7 in (20.0 m), which caps the go-deep strategy outright. R3 has no such cap.
- Corner lots. In R3 the minimum rear yard drops to 11 ft 6 in (3.5 m) where an interior side yard of 9 ft 10 in (3.0 m) is provided.
If you are weighing two specific lots, the useful exercise is not the theory — it is drawing both envelopes to scale with your actual frontages, your actual front yard rule and your actual zone. That is a morning of work and it settles the argument.
Related reading: what your Oakville lot actually allows under By-law 2026-088, how lot frontage is measured, and when an Oakville lot can be severed.
Free zoning check
Send me the address. I’ll tell you what you can build.
Your zone sets lot coverage, height, storeys and setbacks, and those four numbers decide your square footage far more than the size of the lot does. Give me the address and I will come back with the buildable envelope for that specific property.
I will also flag anything that looks like it would need a minor variance, and roughly what that adds to your timeline.
Rahul Kumar — HCRA-Licensed Custom Home Builder, Golden Brick Homes · Broker, Royal LePage Certified Realty. General information only; confirm zoning for any specific property with the Town of Oakville.
Frequently asked questions
Does a wider lot let me build a bigger house in Oakville?
No. Maximum floor area and lot coverage are set by lot area, not lot shape. Two lots of equal area in the same zone permit the same size of house. What changes is the shape of the buildable envelope and how much yard is left over.
Why does a narrow lot get a larger buildable envelope?
Because interior side yards scale with frontage under Table 6.6.1, while front and rear yards do not. A wider lot surrenders more width to side yards, and gains nothing in depth. On two 8,000 sq ft lots in R3, the 59 ft lot yields about 4,076 sq ft of envelope against 3,410 sq ft on the 79 ft lot.
Can I put a pool on a narrow lot in Oakville?
Usually, and often more comfortably than on a wide shallow lot, because depth is what a pool and its surround need. The binding constraint is more often the soft landscaping minimum — R3 requires 35% of total lot area to remain soft landscaping, which caps the total of building, driveway, patio and pool deck.
What is the minimum lot frontage in Oakville R3?
49 ft (15.0 m) under By-law 2026-088, with a minimum lot area of 4,844 sq ft (450.0 m²). Note these changed with the by-law — the former RL3 zone required 59 ft (18.0 m) and 6,001 sq ft (557.5 m²).
Does an attached garage count toward floor area in Oakville?
Yes, since By-law 2026-088. It also earns a narrower interior side yard than a detached garage does, so it is a trade rather than a straight loss.
Sources
- Town of Oakville By-law 2026-088, Tables 6.3.3 and 6.6.1, as enacted 15 June 2026 and approved by the Ontario Land Tribunal on 20 August 2026 (Case OLT-26-000698).
- Town of Oakville Zoning By-law 2014-014, Part 6, as amended.
Figures are illustrative and drawn to the standards in force at the date of writing. Zoning outcomes depend on the specific lot, its zone, its overlay and any special provisions. Confirm against the enacted by-law and with Town zoning staff before you rely on any of it.
