Updated April 2026 | By Israel Kaplan, Owner of Sodding Company | 10+ years installing sod across the GTA
Proper soil preparation is the single most important step in a successful sod installation. Skip it, and even the highest-quality Kentucky Bluegrass will struggle to root, yellow within weeks, and leave you with the patchy lawn you were trying to fix in the first place. Whether you are replacing a damaged lawn in Toronto, sodding a new construction lot in Vaughan, or resodding your backyard in Markham, the steps below will help you get the soil right before the first roll of sod goes down.
Quick Facts: Soil Preparation for Sod Installation
- Ideal topsoil depth: 4–6 inches of quality, screened topsoil beneath the sod.
- Soil pH range: 6.0–7.0 is optimal for Kentucky Bluegrass in Ontario.
- Grade slope: Finished grade should slope away from the house at roughly 1–2% to prevent drainage issues.
- Timeline: Soil prep for an average GTA lawn (500–2,000 sq ft) typically takes 2–4 hours; the sod itself is laid the same day.
- Cost factor: Soil preparation usually accounts for 30–40% of the total sod installation price, which ranges from $2 to $6 per square foot installed in the GTA.
Sodding Company is a sod installation specialist serving Toronto and the GTA. Below, we walk through every stage of soil preparation so you know exactly what to expect when you hire a professional — or if you are tackling the prep yourself before a crew arrives.
Why Does Soil Preparation Matter So Much?
Sod is a living product. The roots need to make contact with loose, nutrient-rich soil within hours of being harvested from the farm. If the soil beneath is compacted, full of debris, or at the wrong pH, the roots cannot penetrate and the sod dries out from below. In Ontario’s climate — where summers can hit 35°C and winters drop well below freezing — a weak root system means the lawn will not survive its first full season.
Proper preparation also prevents long-term problems like poor drainage, uneven settling, and weed breakthrough. Spending the time on soil prep upfront saves homeowners in Richmond Hill, Aurora, Newmarket, and across the GTA from costly repairs or a second sodding job down the road.
How Do You Prepare Soil for Sod Installation? Step by Step
Step 1: Remove the Old Lawn and Debris
The first step is stripping the existing grass, weeds, and any organic debris down to bare soil. Professional crews use a sod cutter to remove the old turf in strips, which are then loaded into a dump trailer for disposal. Rocks larger than a golf ball, old roots, and construction debris all need to come out. On new construction sites in areas like Stouffville or Pickering, this stage may also involve removing builder’s fill — the low-quality subsoil that gets compacted during the building process.
Step 2: Test and Amend the Soil
A basic soil test tells you the pH level and nutrient profile. Kentucky Bluegrass — the standard sod variety used across Ontario — thrives in soil with a pH of 6.0 to 7.0. If the soil is too acidic, lime can be added. If it is too alkaline, sulphur brings it down. Most GTA soils fall within an acceptable range, but clay-heavy soils common in Vaughan, Thornhill, and North York benefit from organic matter amendments like compost to improve drainage and aeration.
Step 3: Add and Grade Topsoil
Quality screened topsoil is the foundation of a healthy sod lawn. You want a minimum of 4 inches of topsoil, with 6 inches being ideal for long-term root development. The topsoil should be spread evenly and then graded so that the finished surface slopes gently away from the house and any structures. Proper grading prevents water from pooling against the foundation — a common issue on properties in Scarborough and older Toronto neighbourhoods where original grading has settled over the decades.
At Sodding Company, we use laser-guided levelling on larger projects to ensure the grade is consistent across the entire lawn area. For smaller residential jobs, hand raking and a landscape rake deliver the same precision.
Step 4: Compact Lightly and Rake Smooth
After grading, the soil needs a light roll with a lawn roller or a pass with a plate compactor to eliminate air pockets without over-compacting. The goal is soil that is firm enough to walk on without sinking but loose enough for roots to penetrate. A final pass with a landscape rake removes any remaining clumps or stones and creates a smooth, even surface. The finished grade should sit about 1 inch below the level of adjacent walkways and driveways — this accounts for the thickness of the sod itself.
Step 5: Apply Starter Fertilizer
A phosphorus-rich starter fertilizer applied to the soil surface just before the sod is laid gives the roots an immediate nutrient boost. Look for a formulation like 10-20-10 or a similar starter blend. The fertilizer should be lightly raked into the top half-inch of soil so it is right where the new roots will reach first.
What Are Common Soil Preparation Mistakes to Avoid?
Even well-intentioned DIY homeowners make mistakes that undermine their sod investment. Here are the most common ones we see across the GTA:
Laying sod over old grass or weeds. The old vegetation creates a barrier that prevents root contact. It also decomposes unevenly, causing dips and bumps in the lawn within months.
Skipping topsoil on clay subsoil. Many properties in Ajax, King City, and parts of Markham sit on heavy clay. Without an adequate topsoil layer, the sod roots cannot penetrate and drainage becomes a serious problem.
Over-compacting the soil. Using a heavy roller or compactor turns the soil into a hard surface that roots cannot grow into. Light compaction is necessary; heavy compaction is destructive.
Ignoring grade and drainage. Water that flows toward your house instead of away from it will cause foundation issues over time. Grading is not optional — it is a structural requirement.
Should You Prepare the Soil Yourself or Hire a Professional?
If you have experience with landscaping, own or can rent the right equipment (sod cutter, plate compactor, landscape rake), and have access to quality screened topsoil, DIY soil preparation is possible for small areas. However, for lawns over 500 square feet, or any project that involves regrading, most homeowners find that hiring a professional crew saves time and delivers significantly better results.
Sodding Company handles the full process — from old lawn removal through soil preparation, grading, and sod installation — typically in a single day for residential properties across Toronto, Vaughan, Markham, Richmond Hill, Aurora, Newmarket, Pickering, and Stouffville. The price includes all labour, materials, topsoil, and cleanup.
Ready to Get Your Soil and Sod Done Right?
Proper soil preparation is what separates a sod lawn that thrives for years from one that fails in the first summer. If you are planning a lawn replacement or new sod installation anywhere in the GTA, contact Sodding Company for a free estimate. We will assess your soil conditions, provide a clear quote, and get your new lawn installed — usually within the same week.
Contact Sodding Company for a free estimate
Frequently Asked Questions
How deep should topsoil be for sod installation?
A minimum of 4 inches of quality screened topsoil is recommended, with 6 inches being ideal for strong root development and long-term lawn health in Ontario’s climate.
Can I lay sod directly on clay soil?
It is not recommended. Clay soil drains poorly and compacts easily, which prevents root growth. Adding 4–6 inches of screened topsoil over clay and amending with compost gives sod the best chance to establish.
How long does soil preparation take before sod installation?
For an average residential lawn (500–2,000 sq ft), soil preparation takes 2–4 hours. Most professional sod installation companies, including Sodding Company, complete the full prep and sod installation in one day.
Do I need to add fertilizer before laying sod?
Yes. A phosphorus-rich starter fertilizer (such as a 10-20-10 blend) applied to the prepared soil surface encourages faster root establishment and gives the new sod a strong start.