length (Primary Longitudinal Room Span)Feet & Inches / Decimal Meters (ft-in / m)
The primary longitudinal dimension of the room, wall, or land boundary measured wall-to-wall along the longest continuous interior boundary axis. For residential renovation and ANSI/BOMA Z65 appraisal compliance, measure drywall-to-drywall clearance above the baseboards to ensure accurate square footage without paying for obstructed wall depth.
Default: 18 ft 6 in (5.64 m)
width (Perpendicular Cross-Section Breadth)Feet & Inches / Decimal Meters (ft-in / m)
The lateral breadth dimension perpendicular to the length line across the room span. Following architectural framing tolerances, measure across both room ends and the midpoint; always use the largest reading when purchasing rigid materials like tile or hardwood to prevent running short against tapered or bowed framing.
Default: 14 ft 0 in (4.27 m)
shape_type (Geometric Plan Boundary Model)Planar Boundary Geometry (Rectangle, L-Shape, Polygon)
Architectural footprint configuration governing the decomposition formulas: standard rectangular spaces use Length × Width, L-shaped floor plans apply additive sub-zone partitioning, while circular or curved patios apply radius and apothem calculations to eliminate area estimation skew.
Default: rectangle
waste_margin_pct (Cutting Scrap & Overage Allowance)Material Scrap Overhead (5% to 20%)
Contractor percentage buffer added to net square footage to absorb end-of-row cutoffs, corner trimming, and transit breakage. Recommended industry baselines mandate 5% to 8% for basic straight-plank vinyl, 10% for ceramic tile and hardwood, and 15% to 20% for 45-degree diagonal, herringbone, or chevron layouts.
Default: 10%
pack_size_sqft (Retail Carton Packaging Coverage)Commercial Unit Coverage (sq ft / carton)
The net nominal surface area covered by a single sealed manufacturer carton or bundle. Retail flooring, porcelain tile, and wall planks sell exclusively in full boxes; total required square footage (including scrap) is divided by box coverage and rounded up using the mathematical ceiling function.
Default: 22.5 sq ft / box
material_unit_price (Retail Surface Material Unit Cost)Currency per Unit Area ($/sq ft, €/m²)
Retail purchase price per square foot or square meter for the chosen floor plank, ceramic tile, carpet roll, sod, or paint. Multiplying net installable area plus the waste margin by this unit price establishes the gross material acquisition budget before delivery fees and local sales tax.
Default: $6.85 / sq ft
labor_unit_rate (Professional Installation Labor Rate)Contractor Rate per Unit Area ($/sq ft, €/m²)
Contractor installation charge per square foot or square meter covering subfloor prep, underlayment placement, and cutting labor. Standard residential trade benchmarks average $2.00 to $4.50 per sq ft for luxury vinyl plank and laminate, and $6.00 to $12.00 per sq ft for hardwood, natural stone, or intricate mosaic tile.
Default: $3.50 / sq ft
