Can You Install Artificial Grass Over Existing Grass?

Yes, you can physically lay artificial grass over existing grass, but it is not a good choice for a permanent lawn. The living grass underneath dies, decomposes, and settles, which leaves the new turf lumpy, slow to drain, and open to weeds pushing through. A long-lasting installation starts by removing the old lawn and building a compacted base in its place.

At Amazing Turf and Lawn, every permanent installation in San Antonio starts with removing the old grass. Below, we explain why that step matters, what goes wrong when you skip it, and the few situations where laying turf over grass can work.

What Happens If You Lay Artificial Grass Over Real Grass?

Artificial grass laid over a live lawn cuts off sunlight, so the grass beneath it dies. As the blades, roots, and thatch break down, the ground underneath changes shape, and the turf on top changes with it. Most problems with this shortcut show up within the first season or two.

The surface settles unevenly.

Natural grass and the topsoil it grows in are soft, organic material. As that layer decomposes, it shrinks, and some spots sink faster than others. The turf then develops dips, ripples, and soft patches that hold footprints and collect water. Turf backing follows whatever sits beneath it, so stretching it tighter cannot hide an uneven foundation.

Drainage slows down

Artificial grass drains through holes or a permeable backing, and the water then needs somewhere to go. A mat of dead grass over compacted soil holds water instead of letting it pass through. The result is puddles after rain, soggy edges, and a surface that stays wet longer than it should. Pet owners usually notice first, because urine that cannot drain away leaves odors behind.

Odors and pests

Decaying organic matter trapped under turf can produce a musty smell, especially in summer heat. That damp, sheltered layer also gives insects and grubs a place to live directly under your lawn.

Will grass grow through artificial turf?

Yes, it can. Grass and weeds can find drainage holes in the turf backing and gaps along seams and edges. In San Antonio, Bermuda grass is the bigger concern. It spreads through underground rhizomes and above-ground stolons so that a few surviving runners can push up through seams and around the perimeter long after installation. A weed barrier slows this down, but it works best on a cleared, graded base, not on top of a living lawn.

Warranty and lifespan concerns

Artificial grass is designed to sit on a stable, well-drained base. Installing it over natural grass can shorten the turf’s life and may affect manufacturer warranty coverage. This warranty excludes installs over existing grass.]

Do You Have to Remove Grass Before Laying Artificial Turf?

For a permanent installation, yes. Removing the existing grass, roots, and loose topsoil is the first step in building a proper base, and the base decides how the finished lawn looks and drains for years. Our artificial turf base preparation guide covers each layer in more detail.

A standard professional installation replaces the old lawn in seven steps:

1. Locate underground utilities. Before any digging, contact Texas811, the non-profit that coordinates utility line marking in Texas. The service is free, and you must submit requests at least two working days before digging.
2. Remove the existing lawn. A sod cutter strips the grass and roots, then the crew excavates several inches of soil to make room for the base.
3. Grade the area. The crew shapes the ground with a slight slope so water moves away from the house and toward a drainage point.
4. Install edging and a weed barrier. Edging holds the perimeter in place, and a geotextile weed barrier blocks weeds and separates the soil from the base.
5. Build and compact the aggregate base. Spread crushed stone aggregate in layers and compact it with a plate compactor until it is firm and level.
6. Lay, seam, and secure the turf. Position rolls with the fibers facing the same direction, seam them together, and fasten them around the perimeter.
7. Add infill and brush. Spread and brush in infill, such as silica sand, to support the blades and weigh the turf down.

This is the same process our team follows for every residential artificial grass installation we complete.

The base is the part homeowners never see, and it does most of the work. The Synthetic Turf Council, the industry’s non-profit trade association, publishes guidelines for stone base systems that focus on two things: drainage and stability. A layer of dead grass supports neither.

Laying Turf Over Grass vs. Removing It First

Factor	Turf over existing grass	Grass removed, base installed
Upfront labor	Lower	Higher
Surface over time	Settles and develops dips	Stays flat and firm
Drainage	Slow, prone to puddles	Water passes through the base
Grass and weed regrowth	Likely through seams and edges	Limited by the weed barrier and base
Odor risk	Higher, from decaying organic matter	Low
Best use	Short-term or temporary setups	Permanent lawns, pet areas, play areas

Skipping prep saves time on day one, but a failed installation usually has to be pulled up and rebuilt from the ground, which costs more than doing it right the first time.

Is It Ever Okay to Put Artificial Grass Over Grass?

Laying turf over grass makes sense only for temporary installations. Common examples include:

• A weekend event, party, or wedding
• Staging a yard for photos or a home showing
• A small test piece to see how a turf product looks in your yard

For these uses, mow the grass as short as possible, clear away debris, and lay the turf flat. Plan to take it up before the grass underneath starts to rot. For anything meant to last, you need to remove the old lawn.

Installing Artificial Grass Over San Antonio Soil

San Antonio yards add two challenges that make base preparation even more important: caliche and clay. Caliche is a hard, cement-like layer near the surface that stops water from soaking in. Clay soil drains slowly and shrinks and swells as moisture changes. Laying turf over grass on either soil type traps water right where it causes the most damage.

A proper installation handles both. Crews remove the grass and loose material, grade for slope, and build a compacted aggregate base, adding drainage wherever water tends to collect. Our guide to installing artificial grass on caliche and clay soil explains each soil type in detail.

Drainage planning is the other half of the job. This overview shows how we ensure proper drainage for artificial grass by explaining how water moves through the turf, across the base, and away from your home after a storm.

FAQ

Can you put artificial grass directly on dirt?

You can, but bare dirt has the same weakness as grass: it shifts, holds water, and settles over time. A compacted aggregate base between the soil and the turf keeps the surface level and lets water drain.

Can you kill the grass and leave it under the turf?

Killing the grass first does not solve the problem. The dead grass and roots still decompose, so the ground still settles and traps moisture. You need to remove the grass and roots.

How deep do you dig for artificial grass?

Most installations remove the grass and roots plus a few inches of soil to make room for a compacted aggregate base. The exact depth depends on the soil, the slope, and how the area will be used. 

Do you need a weed barrier under artificial grass?

A weed barrier is recommended for most residential lawns. It limits weeds and grass runners from below and keeps the soil separate from the base layer.

Will artificial grass drain if I lay it over my lawn?

It will drain poorly. Water passes through the turf backing but then sits in the dead grass and compacted soil, causing puddles, soft spots, and odors.

Is it cheaper to lay artificial grass over existing grass?

It is cheaper on day one because it skips removal and base work. Over time, settling, poor drainage, and regrowth often mean you have to lift and reinstall the turf, which costs more than a proper installation.

Get a Lawn That Stays Flat and Drains Well

Removing the old lawn takes more work up front, but it keeps artificial grass flat, clean, and draining well for years. Amazing Turf and Lawn handles the full process, from sod removal and grading to the base, turf, and infill.

Ready to replace your lawn? Request a free quote, and our team will look at your yard, soil, and drainage before any work begins.