Riverhead Building Supply

We supply premium-grade lumber, roofing, siding, flooring, and insulation for residential and commercial projects. Our inventory includes engineered lumber, exotic wood species, and high-performance materials from trusted brands. Professional contractors and homeowners benefit from expert guidance in selecting durable, code-compliant products that meet project specifications and sustainability goals.

Our showrooms feature Medallion, Miralis, and Wolf cabinetry for kitchens, baths, and custom spaces. Clients access design consultations, material samples, and finish options to create functional, stylish interiors. Stock, semi-custom, and fully custom solutions accommodate diverse budgets while ensuring quality craftsmanship and timely delivery for new builds and renovations.

We distribute Andersen, Marvin, and ThermaTru windows and doors in standard and custom configurations. Products include energy-efficient models, decorative glass options, and security-focused designs. Our specialists assist with product selection, energy code compliance, and installation planning to enhance building aesthetics, comfort, and value for residential and commercial clients.

Our hardware department stocks fasteners, connectors, electrical components, plumbing fixtures, and safety equipment. Brands include Baldwin and Emtek architectural hardware for doors and cabinetry. Contractors access bulk ordering, specialized tools, and technical support to ensure proper material selection for structural integrity, functionality, and design cohesion in construction projects.

We operate boom trucks, spider trucks, and box trucks for efficient jobsite delivery of lumber, drywall, and heavy materials. This service reduces contractor logistics costs and project delays by ensuring timely, on-site availability of ordered products. Delivery teams coordinate with construction schedules to support workflow continuity for residential and commercial builds.

We operate 20 locations across Long Island, New York, and New England states including Connecticut, Massachusetts, and Rhode Island.

Yes, we provide jobsite delivery using boom trucks, spider trucks, and box trucks for efficient material transport to construction sites.

Our kitchen design centers offer one-on-one consultations with designers to help plan cabinetry layouts, select finishes, and coordinate installations.

We carry specialty items including cellular PVC trim, custom millwork, and energy-efficient windows to meet unique project requirements.

Our tool departments feature Dewalt, Milwaukee, and Makita power tools along with hand tools, compressors, and accessories for trade professionals.

We accept major credit cards, business checks, and offer account payment options for registered commercial customers.

My wife and I purchased our kitchen cabinets through this store. Dominic Rinaldi designed our kitchen and it was amazing to say the least. He was easy to contact and deal with and came up with a better design than some of Long Islands "top" kitchen remodel companies. Any concerns about imperfections were easily resolved. Ask for Dominic!

Always great service, quality and selection. Never have any issues with special orders or deliveries.

Quality was great but the customer service experience was awful. Took twice as long as originally told and the delivery was awful! They wanted to leave it outside. Then the driver asked me for help moving the counter bc it was too heavy. I'm almost 80! Never dealing with them again!

Excellent friendly and knowledgeable staff they were very helpful in finding what I needed from the counter staff all the way to the people in the yard highly recommend for all your buildings needs

I've got to say anytime we deal with the folks at Riverhead building supply the experience is always terrific. We recently completed a large renovation their support and guidance was integral to the success of our project. From product selections to planning our kitchen, specials shout out to Sandy, she was exceptional in designing our kitchen and cabinet selections. The staff has great expertise, and a positive and professional attitude when you deal with him.

We had great experience at the Riverhead location as well as the Greenport location. It's really a pleasure to do business with a company like this. Home renovation is very stressful these folks really made the process smooth. Can't say enough good things about this organization, professional, friendly, fairly priced, wonderful service, quality products and delivery. You can't ask for more than that.

I purchased about 20 windows from riverhead building supply. I removed the old ones measured the rough openings and ordered them. Not one problem on twenty windows. Then I had to replace an old casement in the kitchen but could not take it out until I got the new double hung replacement. I meassured the window and gave the salesman the measurements. He then gave me the rough opening and ordered the window.

When i got the window it was four inches to small on the witdth and two and a half on the height. I went back to the salesman and he said to me (How do I know you didn't just right in those numbers) I was totally insulted, and then was told their was nothing he could do. So needless to say I will never go back to Jason at riverhead building supply. After being treated like that i would not recommend them to anyone.

Worst company I have ever used. I called them and they told me they had my moldings in stock. Drove 45 minutes to there store to find out they where all out. A bunch of lies. Stay away if your wise.