Since 1975, dormers by Shells Only are the best solution to your expanding Long Island families. Services include all areas of Nassau County, New York, including Manhasset, Glen Cove, and Oyster Bay.

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At SHELLS ONLY, we deliver your dormer project on time and in the budget with strict construction management and fanatical quality control.  Shells Only understand that time is of the essence and never sacrifices quality for speed. Once your dormer has been constructed our interior team of professionals go to work - completing the job with wiring plumbing, insulation, sheetrock, flooring an all the finishing touches to make it your home.