How much will an addition cost per square ft?

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I'm not planning to pay anywhere near the ask, if I even buy anything as most sellers seem to be smoking crack. Your house is not sill worth what it was when the S&P was at 1500.
I'd still like to know what construction costs run on the east end though. I know several architects and have a reasonable idea outside of the hamptons, but something tells me construction costs run higher here, just like everything else.

I've thought of that, too, but before cost you need to know how tough the local government is on permitting that sort of thing, no?

yes, but if the house is on an acre and all the others around it are twice as big, it should be less of an issue...

Those sort of questions are never easily answered, depending upon so many things like basement heights, ceiling heights, materials, bathrooms, etc., etc. But, you should assume an absolute minimum of $275 sq ft and move up rapidly from there.

Just because the other houses are twice as big should not give comfort that an addition could be done as of right. The zoning rules have gotten stricter, and increased set back requirements, lot sizes, and added height restrictions.

@nyc_sport. thanks.
i have actually looked at a place that someone had purchased with the intention of expanding, but ran out of cash. i'd never actually make a bid with out a professional opinion / independent survey.

The biggest dealbreaker with East End construction is the availability of contractors. Quite simply, there are only a handful of contractors willing to make the trek out east; the contractors actually located in the Hamptons are few and very expensive; the best ones are already working on the megamansions. I think $275sf might be a bit high for an addition since most/much of the work has already been done, i.e., electric service, wells, septic, landscaping, testing, etc. If you aren't going for anything too fancy, then I can see it going for under $200sf. However, keep in mind that the permitting process in both East Hampton and Southampton is painful, and you have to be very mindful of zoning, setbacks, town codes and adherence with the Architectural Review Board.

I built a house in the Hamptons and hejiranyc is totally right. Very, very hard to find a good and reliable contractor for a small job-though there is no less work out there. For two years, I couldn't get ANYBODY to bid on my house.