The direct answer: a backyard court is three builds stacked on top of each other: a base of compacted subgrade and crushed stone, a pad of reinforced concrete poured with a deliberate drainage slope, and a surface a few millimeters thick that everyone mistakes for the court. Most of the budget and nearly all of the long-term quality live in the first two layers, which get buried and never seen again. This guide explains what each layer does, how each one fails, and the exact questions that make a builder respect your quote conversation.
Why does the pad matter more than the surface?
Because everything visible is replaceable and everything invisible is not. A worn acrylic surface is a repaint. A cracked, settled, or puddling pad is a demolition. The surface rides the pad the way paint rides a wall: it can flatter good structure or advertise bad structure, and it can never substitute for it. When two quotes for the same court differ by thousands of dollars, the difference is almost never the color coats. It is excavation depth, base thickness, compaction passes, reinforcement, and drainage: the things you cannot see at the ribbon cutting but live with for decades.
What is the subgrade, and how does it fail?
The subgrade is your native ground with the topsoil stripped off, cut roughly level and compacted. Topsoil comes off because organic material decomposes and compresses; a slab poured over sod is a slab scheduled to settle. Failure here looks like nothing for a year, then a corner drops, a crack maps across the slab, and a birdbath forms. Sites with soft, wet, or expansive clay soils need extra work, thicker stone, sometimes soil correction, and honest builders price that after looking at your actual dirt. This is also where call 811 belongs in the story: before any excavation, the free national utility-locate service marks buried lines, per call811.com.
What does the aggregate base actually do?
Between dirt and concrete goes a layer of crushed stone, typically 4 to 6 inches, placed and compacted in lifts. It does three jobs at once:
- Bearing: it spreads the slab's loads evenly instead of letting soft spots concentrate stress.
- Drainage: water that gets under a slab is the enemy, especially where ground freezes; a stone layer gives it somewhere to go instead of heaving the pad.
- A flat, tight table: compacted stone can be graded precisely, which is how the pour above it ends up uniform.
Compaction is the whole game. Stone dumped and smoothed is not a base; stone compacted in thin lifts with a plate compactor or roller is. It is the least glamorous line on the quote and the one most worth asking about.
What makes a good concrete pad?
The typical residential court pad is about 4 inches of reinforced concrete, and the details are where courts are won:
- Reinforcement: steel rebar or welded wire mesh holds the slab together so small cracks stay small. Premium court builds increasingly use post-tensioned slabs, where steel cables through the slab are tensioned after the pour, squeezing the concrete so it resists cracking as a single plate. It costs more and it is the strongest answer on difficult soils.
- Joints, honestly: ordinary concrete manages shrinkage with control joints, which are deliberate weak lines that invite cracking to happen tidily. On a court, joints under the playing area affect ball bounce, which is exactly why post-tensioning, which can eliminate interior joints, became the court industry's premium standard. If a bid shows saw-cut joints across your playing surface, ask how bounce will be handled; it is a fair, revealing question.
- The slope: a court is poured with a deliberate fall of about 1 percent, commonly described as an inch every 8 to 10 feet, in one plane, so rain sheets off. Dead flat pads puddle; over-sloped pads play weird. General concrete practice guidance comes from the American Concrete Institute, and court-specific planning from the American Sports Builders Association.
Why does new concrete wait 28 days before coating?
Concrete does not dry, it cures: a chemical reaction that builds strength over weeks while the slab releases moisture and alkalinity. Acrylic surface manufacturers typically specify about 28 days of cure before their systems go down, because coatings applied over green concrete can blister, peel, and discolor as the slab exhales through them. A builder who offers to pour and paint inside two weeks is not doing you a favor; they are converting your surface warranty into confetti. The honest schedule has a quiet month in the middle, and good builders say so up front.
What is the surface layer, really?
Over a sound pad, the surface is a system of thin layers: an acrylic resurfacer to unify texture, then sand-filled color coats that set pace and grip, then line paint at the sport's real dimensions. Alternatives swap the skin: cushioned acrylic adds rubberized layers for joint comfort, modular tiles snap over the pad, and putting greens use dense sand-dressed turf over compacted stone with no concrete at all. Typical published ranges run $2 to $5 per square foot for standard acrylic, $4 to $8 cushioned, and $3 to $7 for tiles. Our Surface Comparison Tool lays the tradeoffs side by side, and every option shares one truth: none of them fixes what is underneath.
What questions should you ask a builder?
Take these to any quote conversation and you will sound like the most prepared homeowner of the month:
- What subgrade prep is included, and what happens to the price if you find soft soil?
- How thick is the aggregate base, and how is it compacted, in how many lifts?
- What reinforcement does the slab get: mesh, rebar, or post-tension, and why for my soil?
- What slope will the pad be poured at, and where does the water go when it leaves?
- How long will you let the concrete cure before surfacing?
- Which permits does my municipality require, and who pulls them?
A good builder enjoys these questions. Evasive answers on base, cure, or permits are the cheapest red flag you will ever collect. When you are ready, our Court Cost Calculator gives you the range math to compare bids against, and a project request puts vetted local builders on the other side of the table as coverage opens.
Frequently Asked Questions
Is asphalt or concrete better for a backyard court?
Concrete typically wins residential builds today: it holds a plane longer, resists cracking better with proper reinforcement, and carries acrylic systems for decades of recoat cycles. Asphalt costs less up front and remains common in older and municipal tennis construction, but it flexes and ages faster. If a low bid is asphalt, that is the difference you are seeing.
Can you put a court surface over an existing patio or driveway?
If the slab is sound, reasonably flat, and big enough, often yes, and it is the best money-saver in this category. Coatings and tiles inherit whatever the slab does, so active cracks and settlement come along for the ride. A builder's straightedge and an hour tell you which situation you own.
How long should a properly built pad last?
Decades. Surfaces recoat on a 4 to 8 year rhythm, but a pad built on compacted base with proper reinforcement and drainage routinely outlives every surface it carries. That is the entire argument for spending the budget underground first.
Do I really need a permit for a concrete pad?
Very often yes, depending on your municipality: flatwork size thresholds, setbacks, drainage rules, fencing, and lighting each can trigger review. It varies by address, so the controlling answer always comes from your local building department, and the call costs nothing compared to redoing work.
Sources and further reading: utility locating at call811.com; concrete practice from the American Concrete Institute; sports construction guidance from the American Sports Builders Association. Figures are typical published planning ranges; your site, municipality, and written quotes control.