What Equipment Do I Need to Build an ADU?

An ADU is a house that has to be built in a side yard while someone still lives in the front house. That means E35-class access, a dump trailer that does not block the only driveway, and a compact 19 ft telehandler instead of a 56 ft reach forklift in the cul-de-sac. The remodel hub covers the existing house; this page is the new unit in the back.

Equipment for building an ADU

Primary machines

E35-class mini excavator

Primary

3.5-ton with thumb. Step to 305.5 only if the soil or depth demands it and the gate allows.

Footings, sewer tap, and drainage in a side yard that still has a garden.

Skip it when the pad is already built and you are only setting a factory ADU on piers.

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Dump trailer

Primary

6×12 or 7×14 depending on dirt volume. Schedule dump runs around school pickup.

Spoils have to leave without blocking the homeowner’s only car.

Skip it when a roll-off fits along the street legally — rare in tight HOAs.

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Compact 19 ft telehandler

Primary

5,500 lb / 19 ft class. 8k 44 ft is a neighbor meeting.

The only reach forklift that belongs on many ADU lots.

Skip it when it is a single-story unit you can walk materials into, or a crane is already booked.

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Optional / nice to have

19 ft electric scissor

Optional

30–32 in wide. Confirm the ADU door.

Interior finishes without diesel next to a nursery window.

Skip it when you are still in framing and there is no floor.

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Plate compactor

Optional

WP1550 plate.

Patio, parking pad, and trench backfill the inspector will actually look at.

Skip it when all concrete is on a pad another crew already signed off.

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Typical pairing

E35 + dump trailer for dirt and utilities; 19 ft telehandler for a short framing window; 19 ft electric scissor for interiors. Protect the existing driveway like it is already finished — because it is.

Access is the spec

Measure the gate, the basketball hoop, and the overhead lines. E35 with a thumb for footings and sewer tap. CTL only if you can protect the existing driveway and lawn. Wheeled skid steers on a lived-in driveway are how you fund a new pour.

Utilities on an occupied lot

Sewer and water taps are excavator work next to a house that still needs those services. 811 is not optional. A Barreto is rarely the right tool when you are threading between a gas line and a maple.

Structure and finish

Compact telehandler for walls and trusses if you can get it back there. Otherwise it is a crane hour or a lot of hands. Interiors: 19 ft electric scissor through the ADU door, not a 26 ft that will not fit.

FAQ

Factory-delivered ADU vs stick-built?

Factory units still need a pad, utilities, and a crane or specialized setter. We outfit the pad and the trench. We are not the crane.

Can I use the same machines as a full house?

Same classes, smaller access. Do not copy the 8k 44 ft spec-home package onto a 10-foot side yard.

Above-garage ADU?

That is second-story material handling plus a garage that may still be in use. See the second-story guide and measure the swing over the existing roof.