Let’s start with permit types.

Seattle requires a construction permit for most additions and major remodels. This includes anything that changes the exterior of your home, adds square footage, or reconfigures interior spaces in a way that affects structure, use, or life safety.

There are two main types of permits. Which one applies depends on the size and complexity of your project.

1. Subject-to-Field-Inspection Permit (STFI)

This is the simpler route. It is used for smaller, straightforward projects where the scope of work is limited and easy to evaluate during inspections.

An STFI may be an option if:

• You are doing a small, single-story addition
• You are converting a garage to living space without structural changes
• You are remodeling interior spaces without altering load-bearing elements

The city still requires drawings and documentation, but the plan review process is faster and less involved. You apply through the Seattle Services Portal, and the final review happens in the field once construction is underway.

2. Full Construction Permit

Larger or more complex projects go through a full plan review with Seattle DCI. This type of permit is typically required for:

• Second-story additions
• Adding an attached or detached ADU
• Work located in environmentally critical areas (ECAs)
• Projects that trigger multiple zoning, drainage, or energy code considerations

We work through this process often and know what tends to create delays. Our projects begin with a detailed zoning and code analysis, so we know where the boundaries are before drawings begin. That upfront clarity makes the rest of the process more efficient.

How long does it take?

Permit review timelines vary based on the permit type, scope of work, and the capacity of the City. Here is a general range:

This does not include design time or any back-and-forth needed to address plan corrections. We plan accordingly, build in buffers, and communicate regularly with reviewers to help keep things moving.

Steps to get your permit

Seattle structures the permitting process into six steps:

1. Research: Determine which permit applies and gather information about your property
2. Start Your Application: Begin the application through the online portal
3. Submit Plans: Upload your drawings and required documents
4. Receive the Permit: After review and payment, your permit will be issued electronically
5. Schedule Inspections: These occur at key phases of construction
6. Complete the Project: Once inspections are passed, the permit is closed out

We assist with each step, from the application through to final sign-off.

What about ADUs

If your project includes an accessory dwelling unit, whether attached (AADU) or detached (DADU), you will need a full construction permit. Seattle has updated its rules to make ADUs more accessible, but the process still includes full plan review and coordination with city zoning staff.

Permit Fees

Permit fees are based on the total project value, including labor and materials. You typically pay most of the fee when plans are submitted and the remainder when the permit is issued.

Additional fees may apply if your project requires drainage, structural, or geotechnical review. The city also charges a technology fee for online services. We provide estimates during the early design phase to help clients plan for these costs.

Why it matters

Permits are not just a formality. They protect you, your investment, and the long-term safety and value of your home.

Getting permitted means:

• The work is reviewed to meet current building codes, zoning rules, and energy standards
• There is a clear record of the work completed, which matters if you refinance or sell
• Your contractor is accountable to inspections at key stages
• You are protected from the risk of needing to tear something out or redo it later

Unpermitted work may seem like a shortcut, but it often ends up more costly down the line. We prefer to do it right the first time and help clients navigate the process without surprises.

Need help getting started?

We begin most projects with a zoning and code review to understand what is possible and where limitations exist. This lets us design with clarity from the start.

Because we work regularly with the city’s permitting staff, we know what to expect, what to avoid, and how to respond if questions come up. Permitting is rarely anyone’s favorite part of a project, but it is critical to getting it built the right way. If you’re unsure what kind of permit your project might need, or just want to know what’s realistic for your lot, we’re always up for a conversation.