The 2021 Battle of the Builders Top 40 are (by category):
HOT ROD
- Brett Schmeski — 1969 Chevrolet Camaro RS/SS
- Mark Giambalvo — 1930 Ford Model A 2-Door Sedan
- Lonnie Gilbertson — 1965 Chevrolet Corvair
- Josh “Red” Gosnell — 1967 Ford Mustang Fastback
- Troy Gudgel — 1934 Ford 5 Window Coupe
- Troy Gudgel — 1969 Pontiac Firebird
- Mike Fillion — 1956 Oldsmobile 98
- Robert Matranga –1955 Chevrolet Bel Air
- Jeremy Miranda — 1967 Chevrolet Camaro
- Eddie Pettus — 1941 Willys Coupe
SPORT COMPACT/IMPORT
- Ryan Basseri — 2007 Honda S2000
- Shawn Bassett — 1999 Lexus GS300
- Peter Filippo — 2019 BMW M2
- Samantha Frazier– 1973 Nissan Datsun 240Z
- Paul Garcia — 1999 Nissan Skyline GTR VSPEC
- Marcus Fry — 1972 Nissan 240z
- Eddie Pettus — 1961 Austin Healey Sprite
- John Sarkisyan — 1955 Mercedes-Benz 190 SL
- Neil Tjin — 2019 Ford Mach-E
- Simo Veharanta — 1982 Porsche 911 RSR
TRUCK & OFF ROAD
- Willie Davis — 1971 Ford F100
- Brad Deberti — 1965 Chevrolet C10
- Keith Kyker — 1969 Ford F100
- Jeremy Miranda — 1959 Chevrolet Apache
- Craig Piggott — 1974 Ford Bronco
- Kamaka Pocock — 1967 Chevrolet C10
- Daniel Smalley — 1958 Chevrolet Apache
- Bryan Thompson — 1934 Ford Pickup
- John Wargo — 1968 Chevrolet C10
- Randy Weaver — 1965 GMC C10
YOUNG GUNS
- Kaylee Crayton — 2013 Scion FR-S
- Thomas Dickerson — 1967 Ford Shelby GT350 Mustang
- Ezra Evans — 1951 Ford F1
- Dayton Jacobson — 2000 Chevrolet S10
- Chelsie Lesnoski — 1993 Mazda RX-7 FD
- Cole Marten — 1991 Nissan Skyline R32 GTR
- Jonas Neels — 2008 GMC Sierra 2500 HD
- James Thomas — 1949 Ford F1
- Joe Wilder — 1969 Chevrolet Camaro
- Corey Williams — 1968 Dodge Charger