Finished floor elevation (FFE) is the height of the home’s first floor above a reference datum typically the street grade, the property corner, or NAVD 88 (the vertical datum used on FEMA flood maps). FFE matters for four reasons: (1) Drainage the FFE must be high enough above the surrounding grade that rain and snowmelt drain away from the foundation rather than toward it. Maryland’s IRC requires a minimum 6-inch drop in grade within the first 10 feet of the foundation perimeter; (2) Flood protection for FEMA Zone AE or AO lots, the FFE must be at or above the Base Flood Elevation plus any county freeboard requirement; (3) Driveway grade the relationship between FFE and street grade determines the driveway slope, which Maryland county standards typically limit to 10%–15% maximum; (4) Entry experience the FFE determines how many steps are at the front entry, which affects accessibility and curb appeal.

Maryland’s 2009 Stormwater Management Act and MDE regulations require new residential construction to implement Environmental Site Design (ESD) practices to the maximum extent practicable. For a typical Maryland new construction project on a previously undeveloped lot, ESD means: calculating the difference in stormwater runoff between the undeveloped lot (permeable, forested) and the developed lot (impervious surfaces from roof, driveway, patio), then designing and constructing stormwater management practices that capture, infiltrate or detain that additional runoff volume on the site. Common ESD practices for Maryland residential new construction: rain gardens ($2,500–$6,000), bioretention cells ($4,000–$12,000), dry wells ($3,000–$7,000 each), and cisterns with controlled release ($5,000–$15,000). The stormwater management design is submitted as part of the grading and drainage plan in the building permit application.

A full basement on a typical Maryland new construction project requires excavating approximately 10–11 feet below the finished floor elevation: 1 foot for the concrete slab on grade at the basement floor, 9 feet for finished basement height (the current standard for habitable basement space), and 1–2 feet for the footing below the basement floor slab. On a 2,000 square foot building footprint with 2-foot overdig perimeter for working space, this produces approximately 800–1,000 cubic yards of excavated material roughly 60–80 truckloads. Trucking off excavated material costs $20–$35 per cubic yard in Maryland including hauling; 800 cubic yards = $16,000–$28,000 in trucking alone. A cut-and-fill-balanced grading plan that uses the excavated material as fill elsewhere on the lot reduces this cost significantly.

Site preparation (Gate 2) is the clearing and environmental control phase removing vegetation, installing E&S controls, establishing access, and stripping topsoil. Grading (Gate 3) is the engineering phase moving and shaping the remaining earth to create the finished building pad, driveway, yard drainage patterns, and stormwater management features at specific designed elevations. Site prep creates a cleared, controlled site. Grading creates the finished landform that the foundation is built on. Grading requires survey control (the grading contractor works from staked elevation benchmarks) and engineering judgment (the FFE is an engineering decision, not an aesthetic one). In Maryland, the grading plan is submitted to the county as part of the building permit application and is reviewed for stormwater management compliance before permit issuance.