20-gallon quiet compressor
Both are oil-free, quiet-series 20-gallon compressors, so they are tolerable in an attached garage. Pick on the sale, the warranty path and the noise rating you can live with.
Layout · Two-car, 20 x 20
Welding and fab layout for a 20x20 two-car garage
A welding and fab in a 20 x 20 ft garage with no vehicle inside: all 6 machines fit. 3 circuits including 240V, subpanel around 100 A, and 357 of 400 sq ft is aisle, operator zone and open floor rather than machine.
1. MIG welder on a cart (30 x 20 in)2. Steel welding table (48 x 30 in)3. 20 gallon compressor (28 x 20 in)4. Tool bench (Grinder, Drill press) (54 x 24 in)5. Roller tool cabinet (42 x 20 in)6. Steel shelving unit (60 x 24 in)
machinebenchoperator zonevehicle
What fits in a 20x20 two-car garage for welding and fab
| # | Machine | Footprint | Size source |
|---|---|---|---|
| 1 | MIG welder on a cart | 30 x 20 in | planning allowance |
| 2 | Steel welding table | 48 x 30 in | planning allowance |
| 3 | 20 gallon compressor | 28 x 20 in | planning allowance |
| 4 | Tool bench (Grinder, Drill press) | 54 x 24 in | planning allowance |
| 5 | Roller tool cabinet | 42 x 20 in | planning allowance |
| 6 | Steel shelving unit | 60 x 24 in | planning allowance |
Every machine in this trade's package found a place on the floor.
Where the floor goes
| Item | Sq ft | Share |
|---|---|---|
| Garage floor | 400 | 100% |
| Vehicles | 0 | 0% |
| Machine and bench footprints | 43 | 11% |
| Aisles, zones and the door apron | 357 | 89% |
There is room to spare, so the next purchase can be a bigger machine rather than a smaller bay. Footprints are the machine's own size; the zones and aisles are why a garage "feels" smaller than the sum of its machines.
Welding and fab notes for this bay
Keep the welding table away from anything that burns, clear gasoline and solvents out of the room, put a fire extinguisher in reach and add a curtain or screen so arc flash does not reach the garage door.
Circuits for this layout
| Circuit | Volts | Breaker | Wire | Receptacle |
|---|---|---|---|---|
| MIG welder on a cart | 240V | 40 A | 8 AWG | NEMA 6-50R |
| 20 gallon compressor | 120V | 20 A | 12 AWG | NEMA 5-20R |
| Shared bench circuit 1 | 120V | 20 A | 12 AWG | NEMA 5-20R (several) |
That is 3 circuits, about 60 A of demand after diversity, and a subpanel in the 100 A range to ask your electrician about. Sizes use NEC Table 430.248 for motor amps and Table 310.16 (60 C column) for wire; have a licensed electrician confirm. The workshop amps calculator lets you change the loads.
The welding and fab package for a 20x20 two-car garage: Amazon and Grizzly
One card per machine in the plan. Each shows the Amazon pick and the Grizzly Industrial pick for the same job.
Roller cabinet
The Amazon combo is a one-box purchase; the Grizzly roller cabinet pairs with its 42 in top chest when you want to add drawers in stages.
Prices change often and Grizzly runs sales, so the buttons show current prices.
Rest of the shop: the small gear
Storage, bases and safety items for this layout.
Prices change often; the button shows today's price on Amazon.
Email me the buy list for this layout
Every machine, bench and base in this plan as one list you can keep, with the circuits it needs. Plus a few short emails, then a couple a month at most.
Unsubscribe anytime. You can also just read the checklist on this site.Size the systems for this garage
- Heater size for a 20x20 two-car garage
- Dust collector size for a 20x20 two-car garage
- Shop lighting for a 20x20 two-car garage
- Air filtration for a 20x20 two-car garage
- Mini-split size for a 20x20 two-car garage
- Subpanel for a welding and fab
- 240V in a garage, explained
Fit sheets for the machines in this plan
Other trades and garage sizes
- Woodshop in a 20x20 two-car
- Machine shop in a 20x20 two-car
- Auto and mechanic in a 20x20 two-car
- Mixed shop with a car parked in a 20x20 two-car
- Welding and fab in a 12x20 one-car
- Welding and fab in a 12x22 one-car
- Welding and fab in a 22x22 two-car
- Welding and fab in a 24x24 two-car
- Welding and fab in a 32x24 three-car
Frequently asked questions
What circuits does a welding and fab need in a 20x20 two-car garage?
The machines in this plan need 3 circuits: 1 at 240V and 2 at 120V, which suggests a subpanel in the 100 A range. Have a licensed electrician confirm the service and the panel.
How much floor is left in a 20x20 two-car garage after a welding and fab?
About 357 of 400 sq ft, 89 percent, is aisle, operator zone and door apron once Welder cart, Weld table, Compressor, and Tool bench and the rest are placed.
This page is researched guidance, not professional electrical, engineering or safety advice. Circuits, loads and clearances depend on your house, your service and your town: have a licensed electrician confirm any wiring, and check local code and each manufacturer's manual before you act.
