The paver you pick matters less than the base it sits on. Nearly every sunken, wavy or shifting paver patio comes down to the same causes: too little gravel base, poor compaction, no edge restraint or bad drainage. So when you’re choosing a paver contractor, judge them on how they describe the base and drainage, not on the photos of finished patios. Ask for base depth in inches, how they compact it, what slope they’ll build in and what edge restraint they use, and get it written into the contract. Then compare quotes line by line rather than on the total. Here’s exactly what to ask, the red flags to watch for and how to compare paver installation bids.
Part of our Landscaping & Hardscaping guide →
In this guide
- Why Base Prep Is Everything
- Where to Find Paver Patio Contractors
- Questions to Ask Every Paver Contractor
- Base-Prep Benchmarks to Compare Answers Against
- Red Flags When Hiring a Hardscaper
- How to Compare Paver Installation Quotes
- What a Good Paver Contract Includes
- Choosing Pavers With Your Contractor
- Common Paver Failures and What Causes Them
- During and After the Install
- Frequently Asked Questions
Key Takeaways
- Get at least three written quotes, and have every one specify base depth, base material, compaction method, bedding layer, edge restraint and joint sand.
- Typical residential patios and walkways use about 4–6 in of compacted gravel base; driveways typically need 8–12 in, more on clay or in cold climates.
- Ask about industry training such as the CMHA (formerly ICPI) concrete paver installer certification, plus license and insurance where your state requires it.
- Red flags: base depth “as needed,” no plate compactor, no edge restraint, large cash deposit, no written warranty.
- The cheapest bid is often cheap because it skips excavation and base material, which you can’t see once the pavers are down.
Why Base Prep Is Everything
A segmental paver surface is flexible. Its strength comes from layers underneath that spread loads and drain water:
- Excavation down to firm subgrade, removing topsoil and organic matter.
- Compacted subgrade, with geotextile fabric over clay or soft soils in many installs.
- Crushed-stone base (dense-graded aggregate), placed and compacted in lifts of a few inches at a time.
- Bedding layer of about 1 inch of coarse concrete sand or fine chip stone, screeded flat but not compacted before pavers go down.
- Pavers, compacted into the bedding with a plate compactor.
- Joint sand, usually polymeric, swept in and activated.
- Edge restraint along all unsupported edges to stop pavers from creeping outward.
Skimp on any of these and the patio may look perfect on day one and settle within a couple of winters. For the DIY version of this process, see how to build a paver patio; it’s also useful background for judging a contractor’s answers.
Where to Find Paver Patio Contractors
- Local hardscape supply yards: ask the counter staff which installers buy materials there regularly and which jobs come back with problems. They see it all.
- Paver manufacturers’ contractor programs: many major paver brands list authorized or certified installers by zip code.
- Neighbors: ask about patios at least three to five years old; that’s when bad base work shows.
- Local service directories: our directory of local landscaping and hardscaping services is a starting point for finding pros near you.
Questions to Ask Every Paver Contractor
About the company
- How long have you been installing pavers, and is hardscaping your main business or a sideline to mowing?
- Are you licensed (where required in your state) and insured for general liability and workers’ compensation? Can I see the certificates?
- Has anyone on the crew completed concrete paver installer training, such as CMHA/ICPI certification?
- Will you, or a subcontractor, be doing the work? Who’s the on-site lead?
- Can I see two or three patios you built at least three years ago?
About the base and drainage
- How deep will you excavate, and how many inches of compacted base will there be?
- What base material will you use, and how will you compact it (machine size, lift thickness)?
- Will you use geotextile fabric over the subgrade?
- What’s the bedding layer material and thickness?
- What slope will the patio have, and which way will water drain? (Typically about 1/8 to 1/4 inch per foot away from the house.)
- How far will the base extend past the paver edge?
- What edge restraint will you use, and how is it anchored?
About the job
- Which paver product, color and pattern is included, and who orders it?
- Is soil removal and disposal included?
- Do you call 811 for utility locates before digging?
- Do you need permits, and who pulls them?
- How will equipment access the backyard, and who repairs lawn or irrigation damage?
- What’s the schedule, and what happens if it rains?
- What warranty do you give on workmanship, and what does it cover?
Base-Prep Benchmarks to Compare Answers Against
Exact specs vary with soil, climate and paver manufacturer guidance, but answers far below these typical ranges deserve questions.
| Application | Typical compacted base | Notes |
|---|---|---|
| Walkway (foot traffic) | About 4–6 in | More in clay or freeze-thaw areas |
| Patio (foot traffic, furniture) | About 4–6 in | Deeper under fire pits, grills, hot tubs |
| Driveway (vehicles) | About 8–12 in | Thicker pavers (often 80 mm) recommended |
| Bedding layer (all) | About 1 in | Screeded, not compacted before laying |
Red Flags When Hiring a Hardscaper
- Vague base specs: “we’ll put in what it needs” or “a few inches of gravel.” Insist on numbers in writing.
- Sand-only base: pavers laid on sand alone with no crushed-stone base will settle.
- No plate compactor: hand tampers aren’t enough for a patio-sized base.
- No edge restraint or plans to rely on soil or mulch to hold edges.
- Pavers set flat to the house with no slope, or sloping toward the foundation.
- Big up-front cash deposit: a modest deposit for materials is normal; large cash-only requests aren’t.
- Door-to-door “leftover materials” offers or pressure to sign today.
- No written contract or warranty.
- A quote far below the others with no clear explanation of what’s different.
How to Compare Paver Installation Quotes
Lay quotes side by side in a simple table. Differences in price usually trace back to one of these lines.
| Line item | What to check |
|---|---|
| Area | Same square footage on every quote? |
| Excavation depth and disposal | Included? How much soil hauled away? |
| Base depth and material | Inches, aggregate type, compaction method |
| Geotextile | Included on clay or soft soils? |
| Paver product | Brand, line, thickness, color, pattern |
| Pattern and cuts | Herringbone and curves need more cutting labor |
| Edge restraint | Type and anchoring |
| Joint sand | Polymeric or regular |
| Extras | Steps, borders, seat walls, lighting, sealing |
| Warranty | Years and what’s covered |
| Payment schedule | Deposit, progress, final on completion |
A bid that’s higher because it includes 2 more inches of base, fabric and a longer warranty is usually the better value. For typical price ranges and what drives them, see our paver patio cost guide.
What a Good Paver Contract Includes
- A site drawing with dimensions, pattern and borders.
- Paver brand, product, color and thickness.
- Excavation depth, base depth and material, compaction method and geotextile.
- Bedding material and thickness, joint sand type and edge restraint.
- Slope and drainage direction.
- Start date, expected duration and clean-up terms.
- Who handles permits, utility locates and restoration of lawn and irrigation.
- Payment schedule tied to milestones.
- Written workmanship warranty, separate from the manufacturer’s paver warranty.
- A change-order process for anything added later.
Choosing Pavers With Your Contractor
A good contractor should walk you through product options rather than push the one they have stock of. Concrete pavers, clay brick and natural stone each have trade-offs in cost, color retention and freeze-thaw durability. Our guides to types of pavers and brick vs concrete pavers help you go into the meeting knowing what you want. For design ideas and how pavers fit into a bigger landscape plan, see our landscaping and hardscaping guide.
Common Paver Failures and What Causes Them
Knowing what goes wrong helps you ask sharper questions and spot a contractor who has thought it through.
| Problem | Usual cause | What prevents it |
|---|---|---|
| Dips and low spots | Thin or poorly compacted base; soft subgrade | Adequate base depth compacted in lifts; geotextile on clay |
| Edges spreading and gaps opening | Missing or poorly anchored edge restraint | Restraint on every unsupported edge, spiked into the base |
| Puddles after rain | No slope or slope toward the house | Built-in fall of roughly 1/8–1/4 in per foot to a drainage point |
| Heaving in winter | Water trapped in base in freeze-thaw climates | Free-draining base, deeper excavation, good drainage away from the slab |
| Weeds and ants in joints | Joints underfilled or regular sand washed out | Polymeric joint sand, properly swept and activated |
| Rocking pavers | Uneven bedding layer or pavers not plate-compacted | Screeded bedding and final compaction pass |
Ask a contractor how they prevent each of these. A seasoned installer will answer quickly and specifically; someone who mostly mows lawns and does the odd patio will often get vague around drainage and edge restraint.
During and After the Install
- Check the base before pavers go down. Ask the crew to let you know when the base is finished so you can see the depth (a quick measurement at the edge of the excavation tells you a lot).
- Watch for compaction. You should see a plate compactor used on the base in several passes and again on the finished pavers.
- Walk the job at completion. Look for consistent joint lines, clean cuts, no rocking pavers, sand properly filled and swept, and water draining away from the house.
- Keep the paperwork: contract, warranty, paver product details and leftover pavers for future repairs.
Frequently Asked Questions
How deep should the base be for a paver patio?
Most residential patios and walkways use about 4 to 6 inches of compacted crushed stone plus about 1 inch of bedding sand. Clay soils, cold climates and areas with heavy loads often call for more.
What certification should a paver contractor have?
Look for concrete paver installer training such as the CMHA (formerly ICPI) certification, plus any state or local contractor license and proof of liability and workers’ compensation insurance.
How many quotes should I get for a paver patio?
At least three. Make sure each one is for the same area and spells out base depth, materials and edge restraint so you’re comparing like with like.
What warranty should a paver installer offer?
Many reputable installers offer a multi-year workmanship warranty covering settling and shifting, separate from the paver manufacturer’s product warranty. Get the terms in writing.
Why are paver quotes so different?
Usually because of base depth, excavation and disposal, paver product, pattern complexity, edge restraint and warranty. The lowest bid often reduces base work, which you can’t see once the job is done.