Supreme Door

At Supreme Door in Newmarket we offer a diverse selection of fire rated hollow metal doors, steel frames, fire rated wood doors, and commercial and residential door hardware for every application and demand. We also carry a wide variety of doors, door closers, exit devices, frames, hinges, locksets, weather stripping, sliding and pocket door kits, padlocks, safes and specialty hardware. What's mor

e, we carry trusted products from brands like KN Crowder, Daybar, Dorex, Baillargeon, Kasp, LCN, Pemko, Schlage, Standard Metal and Von Duprin. Our showroom features an abundance of choices and a comprehensive up-close preview of our diverse inventory, helping to provide you with a one-stop shopping solution, saving you time and money. Custom retrofit work and unique applications are our specialty and we offer the most comprehensive warranty plans in the industry.

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