There is no Chadds Ford borough and no single Chadds Ford township. The 19317 ZIP is split between three municipalities in two different counties, which is unusual even by the standards around here.
The houses are Brandywine Valley throughout. Stone colonials on premium lots, estates on two and three acres, custom houses in the four to seven thousand square foot range. Space is not what limits a project here. Matching what is already in the house is.