Unilock provides high quality building materials for driveways, walkways, patios, retaining walls, and more.
Permeable Pavers
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Pillar Caps
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Massachusetts & New Hampshire's Unilock Hardscaping Supply

For more than 40 years, Unilock has been manufacturing stone for landscape design. Their EnduraColor™ Plus technology combines nature’s minerals with non-fading color pigments to create ultra-realistic surface textures. Their products include EasyClean™ Stain Resistance and Ultima™ Concrete Technology which has four times the strength of poured concrete.

Permeable Pavers

More and more homeowners are discovering the environmental benefits of permeable pavers. Not only are they durable and aesthetically pleasing, they can play an important role in the management and conservation of rainwater.
treo smooth pavers

Treo Smooth

A smaller version of the Beacon Hill Smooth, Treo Smooth offers a smooth surface texture for a sleek, modern look with a contemporary color palette.
unilock cobblestone

Tribeca Cobble

The dimensional accuracy of Tribeca Cobble gives this product a significant advantage over the imported granite cobble stones that have been used in North America’s streets for centuries.
unilock pavers


Simple shapes and a smooth surface texture give this permeable paver system a sleek, contemporary look. Special spacer bars create a 7mm gap between Eco-Priora units which allows water to flow through.


From traditional shapes and textures to the most advanced technology and unique styles, the choices available in our paver collection are unrivaled in the industry. Whether you're dreaming of an intimate patio, a practical driveway or a luxurious outdoor living space, Unilock has pavers for everyone.
artline pavers


The long, clean lines of Artline reflect an emerging trend to modern, linear outdoor designs. The product is sold in a random bundle of seven different rectangular shapes, of varying lengths and two widths.
beacon hill paver

Beacon Hill Flagstone

Inspired by natural cut flagstone, the blended colors and distinctive texture of Beacon Hill Flagstone has a relaxed look and feel, with all the benefits of Enduracolor technology.
bristol valley pavers

Bristol Valley

The subtle surface texture and an understated edge detail of Bristol Valley brings a new, refined elegance to projects where a more commonplace flagstone slab may have been used in the past.
treo pavers

Treo Premier Pavers

The texture of Treo Premier is similar to Beacon Hill Flagstone, with a refined surface and long-lasting color, but is more diminutive in size.


Coping can add a beautiful finishing touch to your pools or walls. A wall cap can be all the difference in making your wall a comfortable seating option for your guests, or can be used as pool coping.
concord wall

Concord Wall

The built in setback design of Concord Wall automatically forms the correct slope for retaining walls, making it a trusted favorite of designers for decades.
estate wall

Estate Wall

The antique-textured finish of Estate Wall creates the appearance of timeworn, natural rock.
rivercrest wall

Rivercrest Wall

Stacked flagstone has been used for centuries in small garden walls and pillars. 
sienastone wall

Sienastone Wall

Bold and dramatic, this large scale wall block (smallest unit weighs 380lbs each) strikes an impressive profile when used for a heavy-duty retaining wall or as treads in large outdoor staircases.

Steps & Coping

Stone steps and coping are often thought of as a practical feature, but they are so much more. Stone steps, in straight or curved configurations, can take an ordinary landscape design to new levels. They can separate outdoor rooms, welcome visitors or lead to new exciting spaces.
ledgestone steps


Ledgestone features pitched edges that are well suited to a wide range of paver and wall product styles, from contemporary to rustic.
sandstone steps


Natural stone from Unilock is suitable for pool decks, patios, entrances, or as an overlay to a wooden deck or existing concrete. Pillar caps, steps and coping are also available.
Limestone steps


Natural stone from Unilock is suitable for pool decks, patios, entrances, or as an overlay to a wooden deck or existing concrete. Pillar caps & steps.
unilock coping

Pillar Caps & Coping

Granite, quartz and marble aggregates are exposed in the sophisticated surface of Architectural Coping and Pillar Caps.


At Powell Stone and Gravel, we work hard to provide our customers with premium materials, fair prices, and expert know-how.
133 Leominster-Shirley Road Lunenburg, MA 01462
Mon - Fri - 7am – 5pm
Sat: 7am - 4pm
673 Spring Street
Winchendon, MA 01475
Mon - Fri - 7am – 5pm
Sat: 7am - 4pm
87 Route 13
Brookline, NH 03033
Mon - Fri - 7am – 5pm
Sat: 7am - 4pm
Material Calculators
We provide various calculators to help provide accurate calculations
mulch by the yard
Mulch Calculator
> Mulch
masonry calculator
Concrete & Masonry Calculators
> Concrete Block
> Concrete Reinforcing Mesh
> Concrete Steps
patio calculators
Patio Calculators
> Paver Base
> Polymeric Sand
driveway calculator
Driveway Calculators
> Gravel Driveway
grass seed calculators
Grass Seed Calculators
> Grass Seed
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