Why Ground Preparation Matters
The base underneath artificial grass has more influence on how the finished lawn performs than the grass product itself. A well-prepared base provides drainage, keeps the surface flat and even, and gives the turf something stable to sit on so it doesn’t shift, sink, or pool water over time. Skipping or rushing this step is one of the more common reasons an otherwise good-quality artificial lawn ends up with soggy patches, an uneven surface, or premature wear.
Can You Lay Artificial Grass Straight Onto Soil?
Generally, no — laying artificial grass directly onto bare soil isn’t recommended. Soil compacts unevenly over time, drains poorly compared to a purpose-built aggregate base, and tends to shift with moisture and temperature changes, all of which can show up as lumps, dips, or standing water under the turf later. Installing a proper sub-base of compacted aggregate is the standard approach for a reason, and it’s worth the extra time even for a small area.
Step-by-Step Ground Preparation
The sequence below reflects the general approach used across most residential installs. Exact depths and materials can vary somewhat by soil type, climate, and local installer practice, so treat the figures here as typical ranges rather than fixed rules.
1. Clear and Excavate the Area
Start by clearing existing vegetation — spraying with a weed killer a few days beforehand can help make removal easier. Dig out the old sod, soil, roots, and any rocks or debris, typically to a depth of around 3-4 inches (roughly 7.5-10cm), to make room for the base materials that follow. If there’s existing irrigation in the area, cap off or reroute any sprinkler lines so they don’t leak under the new surface.
2. Install Perimeter Edging
A solid border — metal landscape edging, composite bender board, or a concrete edge — around the perimeter helps hold the base material in place and gives you a clean, defined line to secure the turf to later. Without edging, loose base material can migrate outward over time, especially at the edges of paths or patios.
3. Decide on a Weed Barrier
A porous geotextile weed barrier laid over the graded soil is common practice to prevent weed growth up through the base. However, if the area will be used regularly by dogs, many installers skip the weed fabric, since it can trap moisture and pet waste underneath and create lingering odor issues. If pets will be using the space, it’s worth weighing this trade-off explicitly rather than defaulting to including a barrier. This is largely the same decision homeowners face under a rock or gravel bed — see this site’s comparison of landscape fabric and soil separator options for a closer look at when a barrier helps and when it tends to cause more problems than it solves.
4. Add and Grade the Base Material
Spread a layer of crushed aggregate base — such as decomposed granite, crusher fines, or road base — typically around 2-3 inches (roughly 5-7.5cm) deep. Rake it flat while maintaining a slight slope away from any adjacent structures so water drains properly rather than pooling against a foundation. If the turf area sits close to the house, this site’s guide to soil for grading around your house covers the slope and drainage principles that apply to the rest of the foundation perimeter too. A thin finishing layer of fine rock dust on top can help create a smoother surface for the turf to sit on.
5. Wet and Compact the Base
Wet the base material thoroughly, then run a vibratory plate compactor over it multiple times until it’s firm and evenly packed. Walk the area afterward to check for soft spots, low areas, or bumps; fill and re-compact as needed until the surface feels uniformly solid underfoot. This step is easy to under-do, and a poorly compacted base is a common cause of later unevenness, so it’s worth taking the extra time here.
Preparing for Pets
Beyond the weed-barrier decision above, a few other details matter if dogs will regularly use the lawn: prioritize a base and backing combination with strong drainage so urine passes through quickly rather than sitting on the surface, and consider planning for periodic rinsing as part of ongoing maintenance. Our guide to choosing the best type of artificial grass covers how backing and drainage specs vary between products, which is worth reading alongside this base-prep guide if pets are a factor.
Common Questions
Can You Ground (Earth) Yourself on Artificial Grass?
Artificial grass is a synthetic, non-conductive material and doesn’t offer the same grounding (earthing) effect that bare soil or natural grass does for people specifically seeking that practice. If grounding is a priority for you, direct contact with soil, sand, or natural grass is the more established approach.
What Downsides Should You Expect Even With Good Prep?
Good ground preparation reduces drainage and unevenness problems substantially, but it doesn’t eliminate every downside of artificial grass. Heat retention in direct sun, the upfront cost of a proper base-and-turf install, and the fact that damaged turf doesn’t self-repair the way living grass can are all worth factoring in regardless of how well the base is prepared. If you end up with offcuts after the install, see our ideas for artificial grass offcuts for practical ways to use the leftover material instead of discarding it.