Bluestone patios and walkways in the Hamptons: thermal or natural cleft, dry-set on a proper base

What's included

The patio you see is the last 10% of the work. Before it: excavation of the old surface or sod, a compacted crushed-stone base over the subsoil, a screeded setting bed, then the stone, cut and fitted, and the joints filled with polymeric sand. Edging holds the field; a French drain ($25–40 per linear foot around a patio) takes the water where the ground will not. One installer's estimate puts site preparation at about 90% of the labor time on a patio job, which is why a low quote is almost always a thin base.

What it costs (2026)

Surface	Installed, per sq ft
Bluestone (Long Island)	$20–50 (sources: $20–40 and $30–50); national blend $16–38
Bluestone, material only	Natural cleft $6–11 · thermal $9–14 · +$2–6 for thicker stone
Concrete pavers (Long Island)	$20–35 in three tiers ($20–24, $24–29, $29–35); national $10–30
Clay brick	$10–20
Porcelain pavers (Long Island)	$30–50
Travertine (Long Island)	$25–45
Limestone, granite, marble (Long Island)	$40–65
Bluestone walkway	$16–55 (labor alone $9–30)
Brick walkway	$8–20
Removing an old patio or slab	$2–6 (a 200 sq ft slab about $400–800)
Grading and base prep	$1.50–4; heavy clay adds $3–8 for base and drainage

The Long Island figures come from contractors' own published pages, which disagree with one another; we print the spread rather than an average. Hamptons quotes sit at the top of these ranges when the access is tight, the pattern is complex or the stone is select.

Thermal or natural cleft

Bluestone is a feldspathic sandstone quarried by around 150 small operations across the Catskills and northeastern Pennsylvania. Natural cleft is split along the stone's grain: textured, slightly irregular, better grip underfoot, cheaper. Thermal is flame-finished to a smooth, uniform face: cleaner lines, more work at the quarry, $3 or so more per square foot in material. Full-color stone carries browns and greens; blue-blue is graded for the even blue-gray and costs more. For a pool surround or a walkway that ices, cleft's texture is a real advantage; for a dining terrace under an architect's eye, thermal is the usual choice.

Dry-set or mortared

Industry practice: 1-inch stone is mortar-set on a concrete slab; 1½- to 2-inch stone is dry-set on a compacted base. On Long Island, dry-set wins for a plain reason: joints between individual stones let the surface move with frost, while a mortared slab has no give and cracks when the ground heaves. Sources disagree on the numbers (one puts dry-laid at 50+ years and mortared at 10–20; another gives dry-laid 20+ and mortar-set flagstone up to 50 with repairs), so we do not print a lifespan; the direction is not in dispute. Polymeric sand in the joints lasts 3–7 years on most jobs, up to 10 in ideal conditions, before it needs redoing.

The ground under it

South of Montauk Highway the South Fork sits on the outwash plain, and its type soil, Bridgehampton silt loam, is well drained but sits on sand and gravel and is commonly saturated in its lower layers in winter, spring and after heavy rain. North of the highway and out to Montauk, the moraine is glacial till: boulders, clay lenses and slopes. Near the bays and ponds the water table can be 2–8 feet below grade. Each of those changes the base: depth, drainage, whether a perimeter drain is needed. The frost-depth figure your base must clear is set by the town building department; published sources disagree on the exact number for Long Island, so we do not print one, and a good mason does not guess it.

Outdoor kitchens and fire features

They usually sit on the patio and get built with it. National 2026 ranges: an outdoor kitchen averages about $13,180 ($6,000–22,000); a masonry fireplace $1,500–9,000 with a prefabricated firebox and a stone surround, $6,000–20,000+ fully custom; a fire pit averages about $830, with a built-in seating-wall version at $2,500–8,000. We have found no Long Island-specific figures for these, so treat them as national.

Sealing

Bluestone absorbs less than 2% water, the best varieties under 0.5%, which is why it survives Long Island freeze-thaw better than most stone. Seal it, if at all, with a penetrating silane or siloxane sealer that lets the stone breathe; a film-forming sealer traps moisture under the surface and flakes it off in winter. Typical cadence for a natural-stone patio is every 2–4 years, closer to 3 near the water or around a pool, at roughly $1–2 per square foot.

Permits and coverage

A ground-level patio rarely needs a building permit, but it often needs a zoning check because patios count toward lot coverage: the Village of East Hampton caps residential coverage at 20% of the lot (small lots get 20% plus 500 sq ft); the Village of Southampton at 14% plus 1,500 sq ft, up to 30%. The Town of East Hampton's clearing limits are being rewritten as of 2026, so ask before you plan a large terrace there. Within 100–150 feet of a wetland in the Town of East Hampton, or 125 feet of one in the Town of Southampton, the patio is a wetlands application. In the Sag Harbor historic district, terraces visible from the street need a Certificate of Appropriateness.

Timeline and season

A 400–600 sq ft patio takes a professional crew 4–5 days, a full week on rocky or clay ground. Spring and early fall are the best seasons on Long Island; summer is fine but the villages restrict work hours (East Hampton Village: weekdays 8am–6pm and Saturdays noon–4pm from May 15 to September 15, no Sundays). Mortar work stops below 40°F without heated materials; dry-set work can go on through winter when the ground is not frozen.