ADU & DADU Site Prep
Washington's HB 1337 opened the door for more ADUs and DADUs statewide, and site prep is the first real step in every one of those builds. RapidDig handles excavation, grading, and utility trenching to get your ADU pad build-ready.
What's Included
- Foundation excavation for ADU/DADU pads
- Utility trenching for a detached unit
- Grading and drainage for the new structure
- Access path clearing on tight residential lots
- Sequencing timed to your builder's schedule
Fast Facts
Equipment: Kubota U48-5 mini excavator & skid steer with grading attachment.
Payment: deposit + milestone progress payments, final balance on completion.
Debris/spoils removal billed separately by load or ton.
Our ADU & DADU Site Prep Process
Plan Review
We look at your ADU plans and site to sequence excavation, trenching, and grading.
Access Prep
On tight lots, this often means clearing a path for equipment first.
Excavation & Trenching
Foundation dig and utility trenching completed to plan.
Grading
Pad is graded and drainage confirmed ahead of the build.
ADU & DADU Site Prep Questions, Answered
What is HB 1337 and why does it matter?
HB 1337 expanded where and how accessory dwelling units can be built across Washington, which has driven a wave of ADU and DADU projects on lots that couldn't support them before — and site prep is the first phase of nearly all of them.
Can you work around a tight urban lot?
Yes — ADU/DADU site prep is frequently on tight, hard-to-access lots, and it's a big part of why we run compact equipment like the Kubota U48-5.
Do you coordinate with my builder?
Yes, we sequence excavation, trenching, and grading around your builder's or GC's schedule.
Where We Provide ADU & DADU Site Prep
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