7 Signs Your Lawn Needs New Sod (And When Overseeding Is Enough)

Sod installation is one of the most expensive services we offer per square foot — and one of the most over-recommended. Half the GTA homeowners who call us asking for sod actually need aeration, overseeding and a season of consistent watering. The other half genuinely need to start over. Here's how to tell the difference.

Signs you actually need new sod

1. More than 50% of the lawn is bare soil, weeds or moss. Overseeding works when there's existing grass to thicken; below that threshold, weeds win the race.
2. The grade is wrong. If water pools after every rain or runs toward the foundation, you need to lift the lawn, fix the grade and sod fresh. Overseeding on a bad grade just gives you a damp weedy mess.
3. Soil is hard as concrete. A screwdriver should push in 4 inches with hand pressure. If it stops at 1 inch, you have compaction so severe that no seed will root.
4. Grub damage so heavy you can roll the lawn up like a carpet. Strip it, treat the soil, sod it.
5. The lawn is more crabgrass and creeping charlie than grass. Once weeds dominate, you can't selectively remove enough to recover.
6. Renovation aftermath — heavy equipment, dropped materials, fuel spills. The soil profile is destroyed; restart.
7. You're selling and need the curb appeal in 14 days. Sod is the only option that gives you a finished lawn that fast.

Signs you only need overseeding

• Lawn is thin but mostly grass — patchy, light green, but green.
• Most of the bare spots are smaller than a dinner plate.
• No drainage problems.
• Weeds are present but not dominant (<25% of the surface).
• Soil is reasonably soft and the lawn responds to water.

For these lawns: aerate, top-dress with quarter inch of compost, overseed with a premium GTA-blend (Kentucky bluegrass + fine fescue + perennial ryegrass), water every day for two weeks. You'll save 70% versus full sod and have a thicker lawn by August.

Best months to install sod in the GTA

Mid-May through mid-June, or all of September. Avoid July and August — sod laid in heat stress needs daily watering for three weeks straight, and most homeowners don't keep up. Late-September installs root through October and arrive at winter strong, which gives you the best lawn the following spring.

What 'premium sod' actually means

We only install nursery-grade sod from established Ontario growers — minimum 18 months on the field, harvested within 24 hours of installation, laid on a graded bed of fresh triple-mix. Bargain sod cut at 6 months has thin roots, more weed seed and dies in patches by August. The price difference is real but small relative to the total job, and it shows for years.