forestair means the stairs at the front of a building, traditionally those used by the occupants rather than by tradesmen, etc. Lexicurio rates it Sui generis — a strength score of 91 out of 100.
Etymology
From fore- + stair.
noun
- The stairs at the front of a building, traditionally those used by the occupants rather than by tradesmen, etc.“The two stone arches and forestair and the whole front of the house were built between 1617 and 1620, giving a new front room on every floor, and a new facade to a basically sixteenth century building.”