USPS ZIP 20878
Gaithersburg · Montgomery County, MD
ZIP Code 20878 Construction Cost Estimating & Crew Wage Index (Gaithersburg, MD)
Bid-ready CSI MasterFormat Divisions 01–48 material takeoffs and labor cost estimates calibrated directly to postal code 20878 in Gaithersburg, Montgomery County, Maryland. Delivered in unlocked Excel + color PDF takeoff layers within 24–48 hours, flat fee from $80.
ZIP 20878 Calibration Card
- Jurisdiction
- Montgomery County
- ZIP Labor Index
- 97.4
- Material Freight Index
- 99.2
- Composite Multiplier
- 0.98x (98.2)
- Coordinates
- 39.1125, -77.2515
ZIP 20878 (Gaithersburg, MD) Burdened Trade Labor & CSI Assembly Rates
Calibrated for Mixed Union & Merit-Shop bidding in Montgomery County (97.4 labor factor).
| CSI Division | Trade & Benchmark Assembly | ZIP 20878 Crew Rate | ZIP Installed Unit Cost | Flat Takeoff Fee |
|---|---|---|---|---|
| Div 26 | Commercial Electrical Distribution & LED Package | $76.46/hr | $19.25/SF | From $85 |
| Div 23 | Packaged VAV RTU + SMACNA Galvanized Ductwork | $72.86/hr | $22.00/SF | From $85 |
| Div 22 | Cast-Iron DWV + Type L Copper Domestic Plumbing | $74.22/hr | $9.62/SF | From $85 |
| Div 03 | 4,000 PSI Footings & Slab-on-Grade w/ Grade 60 Rebar | $63.21/hr | $233.72/CY | From $80 |
| Div 05 | A992 Wide-Flange Structural Steel + Metal Decking | $77.34/hr | $4174/TON | From $90 |
| Div 09 | Metal Stud Framing, Type X Gypsum & ACT Ceilings | $64.77/hr | $10.07/SF | From $80 |
| Div 31 | 3D GPS Mass Grading, Trenching & Select Structural Fill | $70.23/hr | $33.88/CY | From $95 |
MD Building & NEC Code Notes
Maryland Building Performance Standards (2021 IBC/IECC/NEC) + Chesapeake Bay Critical Area stormwater controls.
Site & Environmental Scope Factors
Strict MDE stormwater bioretention/ESD sizing, I-270 BSL-2/BSL-3 cleanroom pressurization, and Baltimore harbor marine pilings.
Prevailing Wage Rules in ZIP 20878
Maryland Prevailing Wage Law applies to public works >= $250,000 with >= 25% state funding.
Order a ZIP 20878 Takeoff in Any of Our 22 CSI Trade Divisions
General Construction
Electrical
Mechanical
HVAC
Plumbing
MEP Combined
Fire Protection
Concrete
Masonry
Structural Steel
Carpentry & Wood
Roofing & Siding
Drywall & Insulation
Flooring
Painting & Coatings
Doors, Windows & Glazing
Excavation & Sitework
Civil & Infrastructure
Landscaping & Hardscape
Specialty & Technology
Demolition & Restoration
Industrial & Process