Seattle Plot Plan vs Survey: What You Actually Need for a Permit

If you are applying for a permit in Seattle, one of the most common questions is whether you need a plot plan, a survey, or both.

Most homeowners assume they are the same thing.

They are not.

And in Seattle, knowing the difference matters because SDCI usually wants a permit-ready site or plot plan first, while a survey is only required in specific situations. Seattle’s Tip 103 makes this clear: permit applications require a site plan showing the property, structures, setbacks, and proposed work. :contentReference[oaicite:0]{index=0}

This is where many permit applications slow down.

Homeowners often submit the wrong document, submit too much technical information, or assume a survey automatically replaces a permit-ready plot plan.

It usually does not.

This guide explains the difference between a Seattle plot plan and a survey, when each one is used, and what homeowners usually actually need for permit approval.

What a Plot Plan Is

A plot plan is a permit drawing.

It is a scaled overhead drawing used to show your property layout, the existing structures on the lot, and where your proposed work will go.

Seattle uses this document to review:

• property layout
• setbacks
• lot coverage
• driveway and alley access
• proposed construction placement
• zoning compliance

This is the document Seattle usually wants first for permit review. SDCI requires a site plan with permit applications and uses it to review placement and code compliance before deeper plan review begins. :contentReference[oaicite:1]{index=1}

What a Survey Is

A survey is a legal property measurement document.

It is usually prepared by a licensed surveyor and is used to establish or verify technical site information such as:

• property boundaries
• lot dimensions
• easements
• rights-of-way
• topography
• legal encroachments

A survey is not the same thing as a permit-ready plot plan.

It is a technical property record, not a permit submission drawing.

In simple terms:

• Survey = legal property measurement
• Plot plan = permit review drawing

Why They Are Not the Same

This is the part most homeowners miss.

A survey may contain the base property data, but it usually does not show the project the way Seattle wants to review it for permit approval.

A Seattle permit reviewer usually does not just need to know where your property lines are.

They need to know:

• what is being built
• where it is going
• how far it sits from property lines
• whether it affects access
• whether it affects lot coverage
• whether it complies with Seattle code

A survey helps provide the base data.

The plot plan is what turns that data into something permit reviewers can actually review.

What Seattle Usually Wants First

For most residential permits, Seattle usually wants the plot plan first.

That is the primary permit document used to review the project layout.

For most permits, the plot plan is what answers the city’s first questions:

• Does the project fit on the lot?
• Does it meet setbacks?
• Does it affect access?
• Does it trigger drainage, alley, or lot coverage review?

That is why Seattle’s permit process asks for a site plan up front. SDCI’s pre-application process specifically requires a site plan upload with a legal description and parcel number. :contentReference[oaicite:2]{index=2}

When You Usually Need a Survey

Seattle homeowners do not always need a new survey.

In many cases, a prior survey is enough to use as the base for a permit plot plan.

A new survey is usually more likely when:

• property lines are unclear
• boundary accuracy is disputed
• the lot is irregular
• the site has topography issues
• the project affects easements or rights-of-way
• the city requires formal survey-level verification

Seattle is stricter when plans show boundaries, rights-of-way, easements, or topography. In those cases, Seattle states those plans must be prepared by a Washington-licensed land surveyor. :contentReference[oaicite:3]{index=3}

What Most Seattle Homeowners Actually Need

For most standard residential permits, what homeowners usually actually need is:

• a prior survey if available
• basic property information
• a permit-ready Seattle plot plan

That is usually enough for decks, sheds, fences, additions, garages, and many other residential permits.

In most cases, the survey supports the plot plan.

The plot plan is what gets reviewed.

What Gets Submitted Wrong Most Often

The most common mistake is assuming the survey alone is the permit submittal.

It usually is not.

The most common submission mistakes are:

• submitting only a survey
• submitting a survey with no proposed work shown
• submitting no setbacks
• submitting no labeled project dimensions
• submitting legal property data without permit context

These are common reasons Seattle permit review slows down or gets kicked back for corrections.

Final Thoughts

If you are applying for a permit in Seattle, the simplest way to think about it is this:

A survey helps define the property.

A plot plan helps Seattle review the project.

They are related, but they are not the same thing.

For most Seattle homeowners, the survey is the base document.

The plot plan is the actual permit document Seattle usually needs first. :contentReference[oaicite:4]{index=4}