How Much Does a 20×20 Patio Cost? A 20×20 patio covers 400 square feet — four times the size of a 10×10 — and typically costs between $3,500 and $18,000 in the USA depending on material, labour, site conditions, and any extras.
At this size, a patio stops being just a surface and starts being an outdoor living space. A 20×20 comfortably holds a large dining table, a lounge or sofa set, a grill station, and still leaves room to walk around. It is the most popular size for families who use their outdoor space regularly.
Use our free Patio Cost Calculator to get a personalised estimate for your country, material, and patio size before contacting any contractor.
Is a 20×20 Patio the Right Size?
A 20×20 patio is one of the most practical sizes for family homes with a decent-sized garden. At 400 square feet, it gives you genuine outdoor living space rather than just a surface to stand on.
Here is what fits comfortably in a 20×20 space:
- A six to eight-seat outdoor dining table with full chair clearance
- A separate lounge or sofa set with a coffee table
- A freestanding grill station or small outdoor kitchen
- Border planters, lighting, and decorative features
- A fire pit area in one corner
If your household is smaller or your budget is tighter, a 12×12 patio covers everyday needs at a significantly lower cost. If you are planning a full outdoor entertaining area with a pergola, kitchen, and seating zones, consider going larger — but costs rise sharply above 400 square feet.
20×20 Patio Cost by Material
Material is the biggest cost variable for a 20×20 project. The difference between a plain concrete slab and a natural flagstone installation on the same 400 square feet can exceed $10,000.
Concrete Patio — 20×20
| Item | Low Estimate | High Estimate |
|---|---|---|
| Materials | $1,200 | $2,400 |
| Labour (if hired) | $1,400 | $3,200 |
| Total (DIY) | $1,200 | $2,400 |
| Total (Pro installed) | $2,600 | $5,600 |
Plain concrete is the most cost-effective permanent surface for a large patio. A standard brushed grey slab at this size runs $2,600–$5,600 installed. Stamped concrete — with decorative patterns and colour — costs $5,000–$12,000 for a 20×20, making it a significant upgrade.
Paver Patio — 20×20
| Item | Low Estimate | High Estimate |
|---|---|---|
| Paver materials | $1,600 | $3,500 |
| Sand and gravel base | $300 | $650 |
| Labour (if hired) | $1,800 | $4,000 |
| Total (DIY) | $1,900 | $4,150 |
| Total (Pro installed) | $3,700 | $8,150 |
Pavers are the most popular choice for a 20×20 patio. Clay brick, concrete, and tumbled stone pavers all fall within this range. Natural stone pavers — travertine, bluestone, or limestone — cost more, often $8,000–$14,000 installed for the same area.
The long-term maintenance advantage of pavers over concrete becomes more significant at larger sizes — replacing a few damaged pavers is far cheaper than resurfacing a cracked 400 square foot slab.
Flagstone Patio — 20×20
| Item | Low Estimate | High Estimate |
|---|---|---|
| Flagstone materials | $2,800 | $5,600 |
| Sand and gravel base | $400 | $800 |
| Labour (if hired) | $2,400 | $5,200 |
| Total (DIY) | $3,200 | $6,400 |
| Total (Pro installed) | $5,600 | $11,600 |
Flagstone is a premium choice for large patios. The irregular shapes and natural texture suit traditional and cottage-style gardens. Installation takes longer than regular pavers, which increases labour costs. Dry-laid flagstone on a gravel base sits at the lower end; mortar-set flagstone on a concrete base costs significantly more.
Pea Gravel Patio — 20×20
| Item | Low Estimate | High Estimate |
|---|---|---|
| Gravel (2–3 inch depth) | $200 | $500 |
| Weed control fabric | $80 | $180 |
| Border edging | $280 | $600 |
| Total (DIY) | $560 | $1,280 |
| Total (Pro installed) | $1,200 | $2,800 |
Gravel remains the most affordable option at any size. For a 20×20, a DIY gravel patio with proper edging and weed fabric costs $560–$1,280 — a fraction of any hard surface. The trade-off is maintenance: gravel migrates, collects debris, and needs topping up every few years.
Cost data based on industry averages from Angi, MyBuilder UK, and contractor pricing data.
20×20 Patio Cost by Country
A 20×20 patio is approximately 37 square metres. Labour costs vary significantly across English-speaking markets. The table below shows mid-range paver patio installation costs.
| Country | Low Estimate | High Estimate | Currency |
|---|---|---|---|
| 🇺🇸 USA | $3,700 | $8,150 | USD |
| 🇬🇧 UK | £2,400 | £5,200 | GBP |
| 🇦🇺 Australia | AUD $4,600 | AUD $10,000 | AUD |
| 🇨🇦 Canada | CAD $4,000 | AUD $9,000 | CAD |
| 🇳🇿 New Zealand | NZD $4,400 | NZD $9,600 | NZD |
| 🇮🇪 Ireland | €2,800 | €6,200 | EUR |
| 🇿🇦 South Africa | ZAR 36,000 | ZAR 78,000 | ZAR |
For a more precise estimate based on your country and chosen material, use the free Patio Cost Calculator.
What Adds to the Cost of a 20×20 Patio?
At 400 square feet, the extras that inflate a small patio budget become more significant. These are the most common additions that surprise homeowners when the final invoice arrives.
Ground preparation and excavation A 20×20 patio requires removing a significant volume of topsoil — typically 4–6 inches deep across the full area. Excavation, disposal, and compaction costs $500–$1,800 depending on ground conditions and access for machinery.
Drainage A 400 square foot hard surface needs careful drainage planning. Without it, water runs toward the house foundation or pools on the surface. Installing a channel drain or directing runoff costs $300–$900 and is worth every dollar.
Old surface removal Removing an existing concrete slab, wooden deck, or cracked patio before building new adds $600–$2,000 at this size. Concrete removal requires cutting and heavy disposal.
Sealing A 20×20 concrete or paver patio benefits from sealing after installation. Professional sealing costs $200–$600 and should be repeated every two to three years.
Lighting In-ground or border lighting adds $400–$1,500 depending on the number of fixtures and whether the work is done during installation or retrofitted later.
Pergola or shade structure Many homeowners add a pergola over a 20×20 patio. A freestanding timber pergola at this size costs $2,500–$8,000 additional — not included in any patio material estimate.
Permits Large patios are more likely to require a permit than smaller ones. Check with your local council before work begins — permit fees typically run $50–$400.
DIY vs Hiring a Contractor for a 20×20 Patio
A 20×20 patio is a large project. DIY is still possible for gravel and some paver layouts, but the volume of material, the need for proper drainage, and the physical scale of the work make professional installation worth serious consideration.
| DIY | Professional | |
|---|---|---|
| Labour cost | $0 | $1,800–$5,200 |
| Equipment hire | $300–$700 | Included |
| Time required | 4–6 weekends | 2–4 days |
| Skill level needed | Moderate–High | Not required |
| Risk of drainage error | High | Low |
| Finish quality | Variable | Consistent |
| Warranty | None | Typically 1–2 years |
DIY works best for: Gravel installation, flat ground with no drainage complications, simple rectangular layouts with standard concrete pavers.
Hire a pro for: Any concrete work, drainage installation, stamped or decorative finishes, sloping ground, removal of existing structures, or projects where a mistake would be expensive to correct.
At 400 square feet, a levelling error or drainage problem becomes significantly more costly to fix than on a smaller patio. For most homeowners, the labour saving from DIY on a 20×20 is offset by the risk and time involved.
For quotes from local contractors, visit Angi (USA), MyBuilder (UK), or hipages (Australia).
How to Save Money on a 20×20 Patio
Choose standard concrete pavers over natural stone. Switching from travertine or bluestone to standard concrete pavers saves $3,000–$6,000 on a 400 square foot project.
Do the clearing and topsoil removal yourself. Hiring a skip and removing topsoil manually saves $400–$800 in excavation costs.
Get five quotes, not three. On a large project, the spread between the lowest and highest quotes is wider. One extra quote can save $500–$1,500.
Install drainage during the build. Adding drainage later costs two to three times more than including it from the start.
Plan lighting in advance. Running conduit during installation costs far less than cutting channels into a finished patio later.
Use our free Patio Cost Calculator before meeting any contractor. Knowing the fair price range prevents you from accepting an inflated quote.
Frequently Asked Questions
How much does a 20×20 concrete patio cost? A professionally installed plain concrete 20×20 patio costs $2,600–$5,600 in the USA. Stamped or decorative concrete finishes for the same size run $5,000–$12,000 depending on pattern complexity and colour.
How much does a 20×20 paver patio cost? A contractor-installed 20×20 paver patio typically costs $3,700–$8,150 in the USA using standard clay brick or concrete pavers. Natural stone pavers cost $8,000–$14,000 for the same area.
Is a 20×20 patio big enough for a family? Yes. A 20×20 patio comfortably accommodates an eight-seat dining table, a separate lounge area, and a grill station with room to move around. It is one of the most practical sizes for regular family outdoor use.
How long does it take to install a 20×20 patio? A professional crew typically completes a 20×20 paver or concrete patio in two to four days. DIY installation takes most homeowners four to six weekends depending on experience and ground conditions.
Do I need a permit for a 20×20 patio? Larger patios are more likely to require a building permit than smaller ones. Requirements vary by location. Always check with your local council or planning authority before starting any groundwork.
What is the cheapest way to do a 20×20 patio? Pea gravel is the cheapest option at $560–$1,280 DIY. For a permanent hard surface, plain concrete is the most affordable at $2,600–$5,600 with professional installation. Use the Patio Cost Calculator to compare options for your country.
Summary
A 20×20 patio gives you 400 square feet of outdoor living space — enough for dining, lounging, and entertaining. Here is a quick recap:
- Cheapest option: DIY gravel patio — from $560
- Most affordable permanent surface: Plain concrete with labour — $2,600–$5,600
- Most popular choice: Paver patio — $3,700–$8,150 (USA)
- Premium finish: Flagstone or stamped concrete — $5,600–$12,000+
Costs vary by country, material, and site conditions. For a personalised estimate, use our free Patio Cost Calculator — enter your country, material, and dimensions for an instant result.
All prices are estimates based on industry averages and contractor data from Angi, MyBuilder, and hipages. Actual costs vary by region and site conditions. Always get at least three local quotes before committing to a contractor.
Last updated: May 2026
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