⚠️ Material estimates only. Labor, excavation, and permits not included. Verify with your Unilock dealer before ordering.
📌 Quick Answer: For a 20×15 ft patio (300 sq ft) with 12% waste, you need about 336 sq ft of pavers. Base material at 6 inches is roughly 5.6 cubic yards. Unilock pavers typically cost $25–$45 per sq ft installed, so a 300 sq ft patio runs $7,500–$13,500 depending on product line .
📋 Key Takeaways — Unilock Materials 2026
Waste factor: 10–15% for cuts and breakage
Base depth: 4–6 inches for patios, 6–8 inches for driveways
Joint sand: roughly 1 bag per 50 sq ft
Edge restraint: perimeter length in linear feet
Installed Unilock paver cost: $25–$45/sq ft
Retaining wall blocks: $35–$50/sq ft installed
ℹ️ This Unilock calculator estimates materials using standard hardscaping formulas: area × waste factor for pavers, area × depth for base, and perimeter for edge restraint .
📊 Formula: Pavers = (Area × Waste) / Coverage | Base = Area × Depth / 324 | Sand = Area / 50 | Edge = Perimeter
💡 Important: Always round up to full bundles or pallets. Unilock sells in specific bundle configurations, and partial bundles may not be available .
📊 Unilock Material Reference (2026)
Material
Coverage / Rate
Notes
Pavers (Beacon Hill)
~2.5 sq ft/paver
Varies by product
Base (gravel)
1 cu yd covers ~162 sq ft at 2"
6" depth = 1 cu yd per 54 sq ft
Joint Sand
~50 sq ft per bag
Polymeric sand recommended
Edge Restraint
Perimeter length
Required for all paver installs
🧱 Example 1: 20×15 Patio
Area: 300 sq ft | Waste: 12%
Paver Area: 336 sq ft
Base: 5.6 cu yd (6" depth)
Sand: ~7 bags
🧱 Example 2: 30×20 Driveway
Area: 600 sq ft | Waste: 12%
Paver Area: 672 sq ft
Base: 14.8 cu yd (8" depth)
Sand: ~13 bags
How the Unilock Calculator Works
This Unilock calculator 2026 estimates the materials you need for a hardscaping project using standard construction formulas. It covers the three main components of a paver installation: pavers, base material, and joint sand .
The formula is: Paver Area = (Length × Width) × Waste Factor. For a 20×15 ft patio with 12% waste, that's 300 × 1.12 = 336 sq ft of pavers. Base material is calculated as Area × Depth ÷ 324 (to convert cubic feet to cubic yards). Joint sand is estimated at one bag per 50 sq ft .
Edge restraint is based on the perimeter: 2 × (Length + Width). This is required for all paver installations to prevent spreading.
Why Waste Factor Matters
No paver installation uses 100% of the material ordered. Cuts at edges, breakage, and pattern requirements consume extra material. A 10–15% waste factor is standard :
10%: Simple rectangular layouts with minimal cuts
12%: Standard patios and walkways
15%: Complex patterns (herringbone, basketweave) or irregular shapes
Always round up to full bundles or pallets. Unilock sells in specific bundle configurations, and you typically can't order a partial bundle .
Base Depth by Project Type
The base is the most important part of a paver installation — and the most common failure point. Depth depends on traffic :
4 inches: Light pedestrian traffic (garden paths)
6 inches: Standard patios and walkways
8 inches: Driveways and vehicular traffic
For retaining walls, base depth increases with wall height — typically 6–12 inches depending on soil conditions and wall height .
Cost Estimates: What to Expect
Material costs vary by product line and region. Based on 2026 data :
Unilock Brussels Block: $25–$35/sq ft installed
Unilock Thornbury: $26–$36/sq ft installed
Unilock Umbriano: $32–$45/sq ft installed
Premium Unilock retaining wall: $35–$50/sq ft installed
These are installed prices. Material-only costs are typically 40–50% of the installed figure. Labor, excavation, and base preparation account for the rest .
Why You Should Verify with a Dealer
This calculator provides educational estimates only. Actual material requirements depend on:
Specific Unilock product coverage rates (which vary by size and shape)
Site conditions (slope, drainage, soil type)
Local building codes and permit requirements
Current pricing (which fluctuates with material costs)
Always verify quantities and pricing with your local Unilock dealer or Territory Manager before ordering .
🧱 Quick Reference — Unilock 2026
Factor
2026 Detail
Waste factor
10–15%
Base depth (patio)
4–6 inches
Base depth (driveway)
6–8 inches
Joint sand
1 bag per 50 sq ft
Installed paver cost
$25–$45/sq ft
Installed wall cost
$35–$50/sq ft
❓ Frequently Asked Questions
How does the Unilock calculator estimate materials?
It uses project area (length × width), a waste factor (10-15% for cuts and breakage), and product coverage rates. For pavers: Total Pavers = (Area × Waste Factor) / Paver Size. Base material = Area × Base Depth × Conversion Factor .
What waste factor should I use for Unilock pavers?
Standard projects use 10-15%. Simple rectangular layouts can use 10%, while complex patterns (herringbone, basketweave) or irregular shapes may need 15% or more. Always round up to full bundles or pallets .
How deep should the base be for Unilock pavers?
For patios and walkways, a 4-6 inch compacted gravel base is standard. Driveways require 6-8 inches. Retaining walls need a deeper base, typically 6-12 inches depending on wall height and soil conditions .
How many Unilock wall blocks do I need?
Wall blocks = (Wall Length × Wall Height) / Block Coverage. Coverage varies by product — check the specific Unilock wall system's square footage per block or bundle. Add 5-10% for cuts and corners .
Does this calculator include labor costs?
No. This calculator estimates material quantities and costs only. Labor, excavation, permits, and equipment rental are separate. Installed Unilock paver costs typically run $25-$45 per square foot depending on product and region .
💡 Expert Tips for Unilock Projects
Tip #1: Never skip the base. Inadequate base preparation is the #1 cause of paver failure — settling, uneven surfaces, and shifting .
Tip #2: Use polymeric sand, not regular sand. It locks joints, resists erosion, and reduces weed growth.
Tip #3: Order all materials at once. Unilock colors may vary between production runs, making exact matches difficult later .
Tip #4: For retaining walls over 3 feet, geogrid reinforcement is typically required. Don't skip it .
Tip #5: Verify bundle sizes with your dealer. Unilock sells in specific configurations, and partial bundles may not be available .
🧱 Need to Estimate Unilock Materials Right Now?
Get a 2026 estimate in 30 seconds. Pavers, base, sand, and cost.
🛡️ CDCalculators Unilock calculator 2026 — data sources: Unilock product coverage rates, 2026 hardscaping cost data. Last updated October 24, 2026. Disclaimer: Material estimate only. Labor, excavation, and permits not included. Verify with your Unilock dealer before ordering.