Let’s make your Hamptons landscape everything you want it to be!

Your landscape can be the perfect setting to enjoy delightful family gatherings, bask in the glorious sunshine, unwind in a soothing space, or all that and more. Whatever you wish for, Mahoney’s designers and craftsmen will create your luxurious new landscape.

Contact us now to create
your dream landscape!

Mahoney’s LIFETIME WARRANTY covers all newly installed trees and shrubs.

If we plant it and continuously maintain your newly installed landscape, you won’t have to pay twice for your trees and shrubs—we guarantee it. If a tree or shrub fails to thrive, we’ll replace the plant material at no cost.

We believe soil amendments are so important that we make our own.

“Cultivating excellence from the ground up” means we produce and custom blend all our compost and soils in-house to promote proper soil microbiology. After an aging and tilling process, the nutrient-rich compost is blended into our planting soil to give your new landscape a healthy, vigorous start.


Our creativity is informed by caretaking and practicality.

Astute design requires extensive knowledge of plant material and how each species, cultivar, and specimen perform in the Hamptons’ unique climate.

Knowledge built over many years of tending Long Island landscapes translates into a design aesthetic that’s creative yet sensitive to the Hamptons’ special environment while fulfilling your family’s lifestyle needs and wishes.

We welcome and appreciate the opportunity to work with your landscape architect. Mahoney also has in-house designers available for your renovation, revegetation, or entirely new landscape project.


Mahoney Associates is where landscape employees come to build careers.

Excellence only happens when the crews working on your project care enough to put in extra effort.

We foster caring by investing in the growth and well-being of our team with continuous learning, talent development, and professional education.

Our team has worked together for years, bringing synergy, excellent communication, and the highest standards to each project.

Mahoney’s well-prepared team gets work done right the first time.

Mahoney Associates completes landscape construction projects throughout Long Island’s East End from our Southampton, NY headquarters.

Our design and installation services for new landscapes, renovations, revegetation projects, and landscape enhancements encompass the following scopes of work.

  • Tree and shrub selection, specimen sourcing, and installation
  • Retaining walls, walkways, terraces, patios, and pool coping constructed of masonry, bluestone, flagstone, travertine, and other hardscape materials
  • Sitework, grading, drainage, and water management
  • Revegetation plantings to comply with local environmental and building code standards (click through to standalone page)
  • Wood structures including decks, gazebos, pergolas, gates, and fences
  • Perennial gardens and seasonal flower rotations
  • Pollinator gardens with native plant palettes
  • Vegetable gardens including raised beds
  • Rain gardens
  • Parterre gardens
  • Containers and other site accessories
  • Landscape masterplan development, conceptual design, construction documents, and specifications

Contact us now to create your dream landscape!

We transform landscapes into brilliant gardens and luxurious outdoor spaces from Westhampton to Montauk, including Quogue, Hampton Bays, Southampton, Water Mill, Bridgehampton, Sag Harbor, Sagaponack, Wainscott, East Hampton, Amagansett, North Haven, Shelter Island and surrounding areas in Suffolk County, New York.