Cost estimator

Stone & Flagstone Patio Cost Calculator

Enter your patio size and stone type. See a national installed price range.

Inputs

All measurements in feet

Lengthft

Widthft

Finish

Stateoptional

Estimated total

National average

Enter your patio size to see an estimate.

These are ballpark figures based on national averages. Actual quotes vary with site access, season and contractor availability.

Updated: January 2026

What affects the price of a stone patio

Natural stone is the most variable of all patio materials. The number in the calculator moves on five levers.

Stone type. Flagstone is the broad category — sandstone, quartzite, and any flat sedimentary rock. Bluestone is a specific, denser sandstone from the northeastern US, more uniform and more expensive. Pea gravel or decomposed granite is the budget option: cheap material, minimal labor, but shifts underfoot and needs top-ups.

Set method. Dry-laid stone on a compacted base is the cheaper and more forgiving install. Stone set in mortar on a concrete slab locks in place and never shifts, but adds the cost of the underlying slab and the mortar work — usually $6 to $12 per square foot on top.

Stone shape. Irregular "crazy" flagstone laid without cuts is the cheapest to install because the mason chooses stones to fit. Sawn rectangles look tighter and more formal but require careful measurement and more cuts per square foot.

Base and drainage. Stone patios in freeze-thaw climates need 6 to 8 inches of compacted gravel base. Skimping here is the number-one cause of stones lifting or wobbling within a few years.

Region. Labor is roughly 40% of the total. The state selector applies a multiplier to the whole estimate.

Stone patio price by material

Installed cost per square foot for a residential patio on a properly prepared base.

Installed cost per square foot, national average
Option	Low	High	Unit
Pea gravel or decomposed granite Loose material, cheapest permanent patio.	$7	$17	/ sq ft
Flagstone (dry-laid) Irregular or sawn sandstone / quartzite.	$18	$36	/ sq ft
Bluestone (thermal) Dense, uniform, holds up in freeze climates.	$21	$42	/ sq ft

Cost by common patio size

Total installed cost, dry-laid flagstone. The calculator adjusts for your state and stone type.

Total installed cost, flagstone
Option	Low	High
10 x 10 (100 sq ft)	$1,900	$3,800
12 x 14 (168 sq ft)	$3,200	$6,500
12 x 16 (192 sq ft)	$3,700	$7,300
16 x 20 (320 sq ft)	$6,100	$12,200
20 x 20 (400 sq ft)	$7,700	$15,300

Total installed cost, pea gravel
Option	Low	High
10 x 10 (100 sq ft)	$700	$1,700
12 x 14 (168 sq ft)	$1,200	$3,000
12 x 16 (192 sq ft)	$1,400	$3,300
16 x 20 (320 sq ft)	$2,300	$5,600
20 x 20 (400 sq ft)	$2,800	$6,900

What is included in these estimates

The base ranges cover a professional dry-laid install on a flat backyard with reasonable access. Included:

Excavation to 6-inch depth and haul-off of soil.
Compacted gravel base plus 1-inch bedding layer of stone dust.
Stone material with a 10% waste factor.
Jointing sand or stone dust for the gaps.
Layout, hand cutting where needed, laying, sweeping and cleanup.

Not included, add separately:

Removal of an existing slab or hard surface. Add $2 to $8 per square foot.
Concrete slab underlayment for mortared stone. Add $6 to $12 per square foot.
Steps, seat walls, retaining walls, or borders.
Sealing the stone. Optional, $1 to $3 per square foot every 3 to 5 years.
Drainage improvements or French drains.
Premium or imported stone species: travertine, limestone, imported bluestone.

Long-term care and sealing

Natural stone lasts longer than any other patio material, but the finish and the joints need attention on their own schedule.

Sealing is optional but recommended. A penetrating sealer applied every 3 to 5 years reduces staining, blocks moss and mildew, and deepens the color. Costs $1 to $3 per square foot in materials applied DIY, or $3 to $6 per square foot done by a pro. Skip it and the stone slowly lightens to a natural patina, which many owners prefer.

Two types of sealer, matched to the stone. Penetrating sealers soak into the stone and leave no surface film. Film-forming (topical) sealers sit on the surface and give a wet or glossy look. Film- forming sealers eventually peel and are hard to reverse — most professionals now use penetrating only.

Efflorescence. A white haze that appears on some new stone patios in the first 6 to 12 months. Caused by mineral salts migrating to the surface as the base cures. Wipes off with a stiff brush and water; do not use acid cleaners on limestone or bluestone. If sealing, wait for efflorescence to run its course before applying sealer.

Joint maintenance. Dry-laid stone patios use polymeric sand or stone dust in the joints. Refill every 3 to 5 years as the top layer erodes. Mortared patios need repointing every 15 to 25 years — small cracks in the mortar joint let water into the base and drive frost damage. A pro repoint runs $6 to $12 per square foot.

Winter care. Rock salt is corrosive to limestone and some sandstones. Use calcium chloride or magnesium chloride ice-melt instead. Metal snow shovels can chip softer stones — plastic or composite shovels are safer.

When it makes sense to DIY

Stone is heavier and less uniform than pavers, which makes DIY harder. Rules of thumb:

Pea gravel or decomposed granite over a compacted base: worth trying for any size. Almost no cutting, forgiving install.
Under 100 sq ft of irregular flagstone on flat ground, dry-laid: borderline. Rent a plate compactor and a diamond saw. Two full weekends.
Cut stone (sawn rectangles, borders, patterns): hire a pro. Cutting stone straight is a learned skill and mistakes waste expensive material.
Any mortared stone: hire a pro. Mortar mixing, joint work and slab prep are outside typical DIY territory.

DIY materials for a 100 sq ft flagstone patio run about $600 to $1,200 plus $150 to $300 in rentals — roughly 40% to 55% of what a contractor would charge. Expect one skinned knuckle per square foot.

Frequently asked questions

How much does a flagstone patio cost?

A dry-laid flagstone patio runs about $18 to $36 per square foot installed. Set in mortar over a concrete slab, expect $22 to $42. Irregular flagstone laid without cuts is cheaper than sawn rectangles because it wastes less labor.

What is the cheapest natural stone patio?

Pea gravel or decomposed granite laid over a compacted base is the cheapest option — around $7 to $17 per square foot installed. It shifts and needs top-ups every few years, but the material and labor cost are a fraction of cut stone.

Flagstone versus bluestone: what is the difference?

Flagstone is a category that covers sandstone, quartzite and any flat sedimentary stone. Bluestone is a specific type of dense sandstone from the northeastern US with a blue-gray color. Bluestone is more uniform, more expensive, and holds up better to freeze-thaw.

Does a stone patio need a concrete base?

Not always. Dry-laid stone can sit on a well-compacted gravel and sand base — this is the more common install. Mortared stone needs a concrete slab underneath, which adds $6 to $10 per square foot but produces a rigid, no-shift surface.

How long does a stone patio last?

Natural stone lasts 50 years or more. The bedding may need re-leveling once a decade in freeze climates, but the stones themselves outlive the house.

Do I need to seal a stone patio?

Optional. A penetrating sealer applied every 3 to 5 years reduces staining and slows moss and mildew. It also deepens the color. Unsealed stone gradually lightens and develops a natural patina, which many owners prefer.

Patio & outdoor room calculators