[1] The Ahearn House and Summer House occupy a single parcel of land on the north side of Pamet Point Road, a rural road in Wellfleet's northwest providing access to the Bound Brook area within Cape Cod National Seashore.

The main house is a 1+1⁄2-story timber-frame cottage, with a gable roof, exterior finished in clapboards (front) and shingles (sides), and brick foundation.

It has a four-bay front facade, with the main entrance in the second bay from the left, framed by simple pilasters.

[2] The summer house is a single-story timber-frame cottage measuring 13 by 18 feet (4.0 m × 5.5 m), with a gabled roof and shingled exterior.

The summer house is of clearly older construction, and was probably standing on the property when it was purchased by Williams.