Walter Thornberg circa 1966

Walter Thornberg circa 1966

Don Thornberg circa 1978

Don Thornberg circa 1978

                The Thornberg family has been working on Fire Island for over 100 years.  Carl (Charles) Thornberg helped to build the boardwalks in Ocean Beach (which were subsequently replaced with the current cement walks).  Walter Thornberg built homes and was the go-to handyman for all of western Fire Island for decades until his retirement in the early 2000’s.  Don Thornberg was a graduate from Alfred State Technical School and became instrumental in the construction and home maintenance of hundreds of homes from Atlantique to Kismet.  When Donald lost with his battle with cancer in 2014, his son Kane took over the family business.  Kane has worked on the Island since the mid 80’s (his whole life essentially).  After graduating from SUNY Plattsburgh, Kane used his building skills to be a successful real estate professional improving and renovating homes throughout Long Island.  Don Thornberg Building Corp. continues today as a reputable building, contracting and home maintenance business serving all of the western end of Fire Island.

Our Commitment

                Don Thornberg Building Corp. is dedicated to providing quality work for a good value.  We believe that things should be done right – the first time.  We stand behind our work.  If you are unsatisfied for any reason we will be more than willing to work with you to make it right.  It’s all about doing what YOU want done.

We never sell you something you don’t need.  This can be a little contradictory to the practices of other contractors, but we believe in long standing relationships with our customers.  If your deck is unsafe we will let you know, but we won’t sell you a new deck that simply needs repair.  If you have a roof leak we can patch it, we won’t force an entire new roof on you.  It is our belief that gaining the trust of the customer will pay off in the long run.  Building and home maintenance on western Fire Island is our focus.  We aren't real estate agents, so our focus will be on doing what's right for our customers - not making a commission on a sale or rental.  Our resources are completely focused on working on Fire Island - we aren't distracted by other jobs on the "main land".

Our Services            

    There is no job too big or too small.  From screen repairs to new construction, we do it all.  Here is just a sample of what we can do for you.

We Specialize in Seasonal Closings including Water Turn-offs and House Draining


-New Decks

-Deck Repair











-Screen Repair


-Rot Repair


Areas Serviced

Kismet, Saltaire, Fair Harbor, Lonelyville, Robin’s Rest, Atlantique and The Summer Club.  Contact us about services East of these towns.

Our Employees

                We only hire skillful, honest and trustworthy employees and sub-contractors; most of which have been working with us for several years.  Since much of the work on homes on Fire Island is done without the homeowner present, it is important to be able to trust that your home and belongings are safe while we are there.  We don’t hire “day laborers”.  All of our employees are polite and respectful of customers and their property, making for a pleasant experience.  We only work with reputable sub-contractors that are licensed and insured.  You can be assured that if someone from our company is sent to your home you will be satisfied.