Before you sign a contract with a concrete patio contractor, you need answers to specific questions about dimensions, materials, and site conditions. A poorly planned patio wastes money and creates headaches down the road. Here's what to ask—and why it matters.
Understand Your Space and Layout
Start by defining exactly how your patio will function. Will it be primarily for dining furniture, a lounge area, or high-traffic circulation? A typical dining area needs 12×14 feet minimum (168 sq ft), while lounging spaces often run 14×18 feet or larger. Measure your existing deck or outdoor area, then add 2–3 feet on each side to avoid a cramped feeling.
Ask your contractor whether the patio slope matters for drainage. Concrete should slope ¼ inch per foot away from your house to prevent water pooling and premature deterioration. A contractor who doesn't mention grading is cutting corners.
Concrete Thickness and Subbase Preparation
This is where many homeowners get surprised. Residential patios typically need 4 inches of concrete—never less. High-traffic areas or regions with freeze-thaw cycles may require 5 or 6 inches. Under that concrete sits the subbase: compacted gravel or crushed stone, usually 4–6 inches thick, which prevents settling and cracking.
Ask your contractor:
- What subbase material will they use?
- How will they compact it, and what equipment?
- Will they remove existing soil, and at what cost?
- Do local frost lines require deeper prep in your area?
Poor subbase work is invisible but critical. It's where cheap contractors cut costs—and where problems emerge within 2–3 years.
Finishes and Surface Options
Basic broom finish is standard and costs $6–$12 per square foot for labor and materials. Smooth trowel finishes run $8–$14 per square foot but can be slippery when wet. Stamped or decorative finishes start around $15–$25 per square foot and add visual appeal but require experienced hands.
Ask whether the finish is part of the quoted price or an upgrade. Also clarify sealing: most contractors recommend a sealer applied 28 days after pour, costing $300–$800 depending on size. Will they apply it, or is that your responsibility?
Jointing and Crack Control
Control joints (the planned cuts in concrete) prevent random cracking. Contractors should space them every 6–8 feet in a grid pattern. Ask whether they'll cut joints within 24–48 hours, or wait until concrete fully cures. Early cutting is often better for crack control.
Some contractors now use fiber reinforcement or wire mesh in the concrete mix to reduce cracking likelihood. Ask if this is included or an additional cost (typically $0.50–$1.50 per square foot).
Timeline and Weather Considerations
A typical patio pour takes 1–2 days, but curing takes 28 days before you can park vehicles on it or subject it to heavy use. Cold or rainy weather delays this significantly. Ask your contractor:
- What's their estimated timeline from site prep to finished surface?
- How will weather affect the schedule?
- What's their rain policy—do they reschedule or protect the pour?
- When can you actually use the patio?
Cost Breakdown and Hidden Fees
Get a detailed, itemized quote. Basic concrete patios range $8–$16 per square foot installed in most markets, but this varies by region and site access. A 400 sq ft patio might run $3,200–$6,400 total.
Common add-ons include:
- Soil removal and disposal: $200–$600
- Gravel and subbase: $300–$800
- Sealing: $300–$800
- Demolition of old concrete or decking: $500–$2,000
Ask whether the quote includes cleanup and debris removal. Don't assume it does.
Contractor Credentials and Insurance
Verify that your contractor carries liability insurance and workers' compensation. Ask for references from patios built within the last 2 years—contact at least two. Request photos of work similar in size and style to yours.
Services like Mercoly make it easier to compare and find trusted concrete patio contractors in your area, seeing multiple quotes and verified reviews side by side.
Frequently Asked Questions
Q: Can I pour a concrete patio in winter? Winter pours are risky because freezing temperatures prevent proper curing; most contractors avoid work below 50°F. Ask your contractor what their cold-weather protocol is before scheduling.
Q: How long does concrete take to cure before I can use the patio? Concrete reaches 90% strength in 7 days and full cure in 28 days; light foot traffic is fine after 7 days, but heavy furniture or vehicles should wait the full month.
Q: What's the difference between control joints and expansion joints? Control joints (cut lines) manage shrinkage cracks, while expansion joints (built-in gaps with filler) allow the concrete to expand and contract with temperature; residential patios typically use control joints every 6–8 feet.
Get at least three detailed quotes, verify insurance, and ask these questions before committing to a concrete patio contractor.