General Contractor on Long Island — Nassau & Suffolk

Long Island commercial construction, Nassau to the East End

Long Island is one of the largest and most varied commercial markets in New York. Nassau County offers dense office, healthcare and retail centers in Garden City, Lake Success and Uniondale. Western Suffolk is home to the Route 110 corridor in Melville and the Hauppauge Industrial Park. Central Suffolk has growing healthcare and university districts around Stony Brook and transit-oriented development at Ronkonkoma. And the East End supports a high-end hospitality and retail economy from Riverhead to Montauk.

Quedan Construction is a Long Island general contractor building offices, medical and dental practices, retail stores, restaurants and commercial kitchens across both Nassau and Suffolk Counties. For detailed Nassau coverage, see our Nassau County general contractor page.

Offices and corporate campuses

We build corporate headquarters, professional offices and regional facilities in Melville, Garden City, Uniondale, Hauppauge, Lake Success and Islandia — coordinating landlord standards, office-park rules and local permits.

Healthcare across both counties

Long Island’s major health systems and private practices drive steady demand for medical construction. We build physician practices, dental offices, imaging suites and specialty clinics from Lake Success and New Hyde Park to Huntington, Stony Brook and Riverhead.

Retail and hospitality

From Roosevelt Field and Smith Haven Mall to village downtowns and East End boutiques, we build stores and restaurants to brand standards — with schedules that respect seasonal deadlines in the Hamptons and North Fork.

Long Island permitting is local

Outside New York City, there is no single Department of Buildings. On Long Island, permits come from the town, city or incorporated village where your project is located, and projects follow the New York State Uniform Fire Prevention and Building Code. In Suffolk, many sites are not connected to public sewers, so changes in use — particularly restaurants and medical offices — may require Suffolk County Department of Health Services wastewater review. We identify these requirements for your specific address before design begins.