What Is an Excavation Permit?
An excavation permit is an official authorization issued by a city or county that allows specific digging or ground-disturbing work to take place. This permit is required when a project involves any form of excavation, especially if the work affects underground utilities, public infrastructure, or the public right-of-way.
Whether you're installing drainage systems, constructing a foundation, or trenching for utilities, understanding the permit requirements is essential for legal compliance and project success.
When Is an Excavation Permit Required?
Local regulations can vary, but excavation permits are generally required for the following types of work:
1. Digging Below Surface Level
- Excavation deeper than 12–24 inches
- Foundation, footing, or basement digging
- Utility trenching for plumbing, gas, or electrical systems
2. Work Involving Public Right-of-Way
- Sidewalk, curb, or roadway modifications
- Driveway installations connecting to public streets
- Sewer or water line work connecting to city systems
3. Land Grading and Earth Movement
- Slope reshaping or soil redistribution
- Retaining wall site preparation
- Hillside excavation
4. Drainage and Stormwater Improvements
- Installation of storm drains, dry wells, or swales
- Alteration of existing water runoff systems
5. Subsurface Demolition
- Removing old foundations or underground structures
- Digging up abandoned utility lines
Why Permits Matter
Working without a permit can result in:
- Fines or legal penalties
- Delays due to inspection issues
- Voided homeowner or contractor insurance
- Orders to halt work or undo completed excavation
For property owners and contractors in Washington State, obtaining the correct permits helps ensure the project follows legal, safety, and environmental standards.
Excavation Permits in Washington State
Permit issuance typically falls under city or county jurisdictions. For example:
- Seattle: Department of Construction & Inspections (SDCI)
- King County: Permitting Division
- Mukilteo: Public Works Department
- Auburn: Permit Center
Applicants may need to provide site plans, utility layouts, soil disturbance information, and proposed schedules.
Always Call Before You Dig
Before performing any excavation, it is essential to contact 811. This free utility marking service ensures all underground lines—such as water, sewer, gas, and telecommunications—are clearly identified before digging begins.
Excavation Services in the Seattle Area
At F&M Construction and Remodeling, we manage excavation projects in full compliance with local codes and permitting requirements. Our team has the experience and equipment to handle residential and small commercial excavation needs efficiently and responsibly.
We provide:
- Permit assistance and regulatory guidance
- Site evaluation and planning
- Professional-grade excavation services
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