Do I need a permit to build a deck in Bellevue, WA?

Yes, in most cases you need a building permit to build a deck in Bellevue. The city requires a permit for any deck that is attached to the house or that is more than 18 inches above finished grade. Your permit application must include a site plan showing the deck's location, dimensions, and distance from all property lines. The site plan must confirm the deck respects the applicable setbacks for your zoning district, which are typically 20 feet from the front, 5 feet from the sides, and 20 feet from the rear for standard residential zones. Small freestanding platforms close to the ground may be exempt, but you should confirm with Bellevue Development Services before starting work to avoid code violations.

What does Bellevue require on a residential site plan?

Bellevue's Development Services department expects a site plan to include the lot boundaries with dimensions, a north arrow, a written and graphic scale, the location and footprint of all existing structures, the proposed new construction clearly labeled, setback dimensions from each structure to the nearest property lines, driveways and walkways, any easements shown on the title report, and identification of any critical area buffers such as wetlands or steep slopes. If your project adds impervious surface, you may also need to show existing and proposed impervious surface calculations. The plan should be drawn to a recognizable scale such as 1 inch equals 20 feet and be legible when printed or viewed digitally through the city's ePlans portal.

How long does it take to get a building permit approved in Bellevue?

Permit review timelines in Bellevue vary depending on project complexity. For straightforward residential projects such as a shed or simple deck, over-the-counter or express review may be available, with approvals sometimes issued within a few days to two weeks. Standard residential building permits typically take two to four weeks for the first round of review. Projects that trigger critical areas review, stormwater analysis, or shoreline permits can take six to twelve weeks or longer. Submitting a complete, accurate application with a properly prepared site plan is the single most effective way to avoid correction cycles and reduce your total wait time in 2026.

How much does a building permit or site plan cost in Bellevue?

Permit fees in Bellevue are calculated based on the estimated construction valuation of the project. A simple shed or small deck permit might cost a few hundred dollars in combined permit and plan review fees. A room addition or detached ADU can run from several hundred to several thousand dollars. There is also a base plan review fee charged separately from the issuance fee. Site plan preparation itself is not a city fee, but if you hire a professional to draw your site plan, costs can range from a few hundred dollars for a basic plan to over a thousand for complex lots. Using an online tool like Site Plan Creator can significantly reduce that preparation cost.

Can I draw my own site plan in Bellevue, or do I need a licensed surveyor?

For most standard residential permits in Bellevue, you are not required to hire a licensed surveyor or engineer to prepare the site plan. Homeowners and contractors can draw their own site plans as long as the plan is accurate, drawn to scale, and includes all the required elements such as lot dimensions, setbacks, structure locations, and easements. However, if your lot has complex topography, critical areas, or you are unsure of your exact property boundaries, hiring a licensed surveyor to establish boundary locations is strongly recommended. For structural components like decks over a certain height or retaining walls, engineered drawings signed by a Washington-licensed engineer may be required separately.

What are the setback requirements for residential properties in Bellevue, WA?

Setback requirements in Bellevue depend on your specific zoning district. For common single-family zones such as R-4 through R-10, typical setbacks are 20 feet from the front property line, 5 feet from each interior side property line, and 20 feet from the rear property line for the primary structure. Corner lots require an additional street-side setback, often 10 to 15 feet. Detached accessory structures like sheds and garages may have reduced setbacks, sometimes as little as 5 feet from the rear and side lines, but cannot be placed within easements or critical area buffers. Always verify the exact setbacks for your parcel through the Bellevue City Code or by contacting Development Services, as overlay zones can modify standard requirements.

Where do I submit my site plan and permit application in Bellevue?

Bellevue accepts most residential permit applications electronically through its online ePlans portal, which you can access through the city's Development Services website. Electronic submission is the preferred and fastest method in 2026. If you prefer or require in-person submission, you can visit the Bellevue Development Services Center at 450 110th Ave NE, Bellevue, WA 98004. The center is open during regular business hours and staff can answer questions about your application. For simple projects, limited over-the-counter review may be available. It is a good idea to call ahead at (425) 452-6875 to confirm current hours and whether your project qualifies for express review.

What happens if I build without a permit in Bellevue?

Building without a required permit in Bellevue can result in serious consequences. The city may issue a stop-work order requiring all construction to halt immediately. You may be required to obtain a retroactive permit, which often involves opening walls or exposing work for inspection, and fees for after-the-fact permits are typically doubled. Unpermitted work can also complicate or delay the sale of your home, as title companies and buyers will flag unpermitted structures during escrow. In some cases, the city can require demolition of non-compliant structures. Washington State law also allows local jurisdictions to place liens on properties with unresolved code violations, so it is always better to permit work correctly from the start.

What are the ADU rules in Bellevue, WA?

Bellevue updated its Accessory Dwelling Unit regulations in 2021, making it easier to add both attached and detached ADUs on single-family lots. Under current rules, most single-family lots can have one attached ADU and one detached ADU, subject to size limits, setbacks, and design standards. Detached ADUs are generally limited to 1,000 square feet or 50% of the primary home's floor area, whichever is less. Both attached and detached ADUs require a building permit and a complete site plan showing how the ADU fits on the lot in compliance with setbacks and lot coverage limits. Owner-occupancy requirements were relaxed under the 2021 update. Garage conversions to ADUs are popular and follow the same permitting process.

Does Bellevue have critical area or tree permit requirements that affect my project?

Yes, Bellevue has some of the most detailed critical area and tree regulations in the region. If your property is near a wetland, stream, steep slope (15% grade or greater), or wildlife habitat corridor, a critical areas review is required before grading or construction begins. Buffer distances vary by resource type and can range from 25 to 200 feet or more. Additionally, Bellevue's significant tree ordinance requires a tree permit for removal of trees meeting certain size thresholds, and replacement planting may be required. These regulations apply even to projects that would otherwise be simple, so checking your lot's critical area status early in the planning process is essential to avoid costly redesigns.

Site Plan Requirements in Bellevue, WA (Permit Guide)

By Site Plan Creator Team • May 29, 2026

Bellevue, Washington homeowners face specific site plan and permit requirements before starting most residential construction projects. This guide covers permit triggers, setback rules, zoning considerations, and how to submit your application to the City of Bellevue's Development Services department. Site Plan Creator simplifies the process so you can get permit-ready fast.

Site plan requirements for residential properties in Bellevue, Washington

Residential Site Plans and Permits in Bellevue, WA

Bellevue is one of the fastest-growing cities in the Pacific Northwest, and with that growth comes a robust set of building and land-use regulations designed to protect neighborhoods, natural resources, and property values. Whether you are adding a deck to your Eastgate home, converting a garage into an ADU in Crossroads, or building a new pool in Somerset, the City of Bellevue requires a properly prepared residential site plan before most permits are issued. Understanding what the city expects, and preparing your documents correctly the first time, can save you weeks of back-and-forth with the Development Services department.

What Is a Residential Site Plan and Why Does Bellevue Require One?

A residential site plan is a scaled, bird's-eye drawing of your property that shows the lot boundaries, existing structures, proposed construction, setbacks from property lines, driveways, easements, and other relevant features. It is not an architectural floor plan. Instead, it gives reviewers a clear picture of how your project fits on the land.

Bellevue requires site plans because the city must verify that proposed work complies with the Bellevue City Code (BCC), particularly Title 20 (Land Use Code) and Title 23 (Building and Fire Code). Reviewers check that structures respect setback minimums, that impervious surface limits are not exceeded, that critical areas such as wetlands or steep slopes are not encroached upon, and that the project aligns with the applicable zoning designation.

Common Residential Permit Triggers in Bellevue

Many homeowners are surprised by how many common projects require a permit in Bellevue. The following work almost always triggers a permit and site plan requirement:

Decks and patios: Any deck more than 18 inches above grade, or attached to the house, requires a building permit.
Accessory structures and sheds: Sheds over 200 square feet require a permit. Smaller sheds may be exempt but must still meet setback rules.
Swimming pools and hot tubs: All in-ground pools and most above-ground pools over a certain depth require a permit, including barrier and electrical inspections.
Fences: Fences over 6 feet in height require a permit. Corner-lot sight-triangle rules also apply.
Additions and room expansions: Any addition to living space requires a full building permit and site plan.
Accessory Dwelling Units (ADUs): Both attached and detached ADUs require permits, and Bellevue has specific ADU regulations under its adopted 2021 ADU code update.
Driveways and impervious surfaces: New or expanded driveways may trigger stormwater review if they add significant impervious surface area.
Retaining walls: Walls over 4 feet in height (measured from the bottom of the footing) require a permit.

When in doubt, contact the Bellevue Development Services Center before starting work. An unpermitted structure can complicate future sales and may require costly retrofits.

Zoning Considerations and Local Quirks in Bellevue

Bellevue's zoning map is more complex than many suburban cities. The city includes a wide range of residential zones, from R-1 (very low density, large lots) to R-30 (higher-density multifamily areas). Your zoning designation controls lot coverage maximums, building height limits, and setback requirements, so the first step in any project is confirming your zone.

Several local factors deserve special attention:

Critical Areas: Bellevue has significant critical area regulations covering wetlands, streams, steep slopes (15% or greater), and wildlife habitat corridors. If your lot is near a ravine, creek, or heavily wooded area, a critical areas review may be required before any grading or construction.
Impervious Surface Limits: Most residential zones cap total impervious surface (rooftops, driveways, patios, walkways) at a percentage of the lot area, often 40-55% depending on zone. Stormwater management plans may be required if you exceed thresholds.
Tree Retention: Bellevue has a significant tree retention ordinance. Removing trees over a certain diameter may require a tree permit and replacement planting.
Shoreline and Floodplain Overlay: Properties near Lake Washington, Lake Sammamish, or Mercer Slough may fall under Shoreline Management Act jurisdiction or FEMA floodplain regulations, adding another layer of review. You can check your flood zone status at the FEMA Flood Map Service Center.
HOA Rules: Many Bellevue neighborhoods have active homeowners associations with design review requirements. HOA approval is separate from city permits and is your responsibility to obtain.

Typical Setback Requirements in Bellevue

Setbacks in Bellevue vary by zoning district, but the following ranges are typical for standard single-family residential zones (R-4 through R-10):

Front setback: 20 feet from the front property line (some zones allow 15 feet for garages set back further)
Side setbacks: 5 feet on each side for interior lots; corner lots have additional street-side setback requirements, often 10-15 feet
Rear setback: 20 feet from the rear property line for the primary structure; accessory structures may be permitted closer in some zones
Accessory structure setbacks: Detached sheds and garages often have reduced setbacks (as little as 5 feet from the rear and side) but cannot be placed in easements or critical area buffers

Always verify setbacks through the Bellevue City Code online portal or by calling Development Services, as overlay zones and specific lot conditions can modify standard requirements.

The Permit Submission Process in Bellevue

Bellevue has invested heavily in its online permitting infrastructure. Here is how the process typically works:

Determine your project type and confirm whether a permit is required by reviewing the Bellevue Development Services permit guides or calling the permit center.
Prepare your site plan and supporting documents. Your site plan should include the lot to scale, all existing and proposed structures, setback dimensions, north arrow, scale bar, lot dimensions, easements, and any critical area buffers.
Submit online through the Bellevue ePlans portal. Most residential permits are submitted electronically through the city's online system. Paper submittals are accepted at the Development Services Center at 450 110th Ave NE, Bellevue, WA 98004.
Pay permit and plan review fees. Fees are based on project valuation. Simple permits may cost a few hundred dollars; larger projects can run into thousands.
Respond to correction requests. Reviewers typically issue comments within 2-4 weeks for simple projects. Complex projects or those requiring critical areas review can take 6-12 weeks or longer.
Receive approval and schedule inspections. Once approved, permits are issued and you can begin construction. Inspections are required at various stages.

For Washington State building code references, the Washington State Building Code Council maintains the adopted codes, including the 2021 International Building Code as amended for Washington.

Common Reasons Permit Applications Get Rejected in Bellevue

Bellevue's plan reviewers are thorough. The most frequent reasons applications are returned or denied include:

Missing or inaccurate setback dimensions on the site plan
Site plan not drawn to scale or lacking a scale bar and north arrow
Lot coverage calculation errors, especially when homeowners forget to include existing impervious surfaces
Failure to identify easements (utility, drainage, or access easements) shown on the title report
Critical area encroachment without required buffers or a formal critical areas study
Incomplete structural details for decks, retaining walls, or additions
Missing stormwater or drainage information for projects that add significant impervious surface

A well-prepared site plan eliminates most of these issues before submission.

Get Permit-Ready with Site Plan Creator

Preparing a professional, accurate site plan does not have to be complicated or expensive. Site Plan Creator gives Bellevue homeowners and contractors an intuitive online tool to produce permit-quality site plans quickly, with the dimensions, labels, and formatting that Bellevue's Development Services reviewers expect. Start your site plan today and move your project forward with confidence.

Frequently Asked Questions

Do I need a permit to build a deck in Bellevue, WA?: Yes, in most cases you need a building permit to build a deck in Bellevue. The city requires a permit for any deck that is attached to the house or that is more than 18 inches above finished grade. Your permit application must include a site plan showing the deck's location, dimensions, and distance from all property lines. The site plan must confirm the deck respects the applicable setbacks for your zoning district, which are typically 20 feet from the front, 5 feet from the sides, and 20 feet from the rear for standard residential zones. Small freestanding platforms close to the ground may be exempt, but you should confirm with Bellevue Development Services before starting work to avoid code violations.
What does Bellevue require on a residential site plan?: Bellevue's Development Services department expects a site plan to include the lot boundaries with dimensions, a north arrow, a written and graphic scale, the location and footprint of all existing structures, the proposed new construction clearly labeled, setback dimensions from each structure to the nearest property lines, driveways and walkways, any easements shown on the title report, and identification of any critical area buffers such as wetlands or steep slopes. If your project adds impervious surface, you may also need to show existing and proposed impervious surface calculations. The plan should be drawn to a recognizable scale such as 1 inch equals 20 feet and be legible when printed or viewed digitally through the city's ePlans portal.
How long does it take to get a building permit approved in Bellevue?: Permit review timelines in Bellevue vary depending on project complexity. For straightforward residential projects such as a shed or simple deck, over-the-counter or express review may be available, with approvals sometimes issued within a few days to two weeks. Standard residential building permits typically take two to four weeks for the first round of review. Projects that trigger critical areas review, stormwater analysis, or shoreline permits can take six to twelve weeks or longer. Submitting a complete, accurate application with a properly prepared site plan is the single most effective way to avoid correction cycles and reduce your total wait time in 2026.
How much does a building permit or site plan cost in Bellevue?: Permit fees in Bellevue are calculated based on the estimated construction valuation of the project. A simple shed or small deck permit might cost a few hundred dollars in combined permit and plan review fees. A room addition or detached ADU can run from several hundred to several thousand dollars. There is also a base plan review fee charged separately from the issuance fee. Site plan preparation itself is not a city fee, but if you hire a professional to draw your site plan, costs can range from a few hundred dollars for a basic plan to over a thousand for complex lots. Using an online tool like Site Plan Creator can significantly reduce that preparation cost.
Can I draw my own site plan in Bellevue, or do I need a licensed surveyor?: For most standard residential permits in Bellevue, you are not required to hire a licensed surveyor or engineer to prepare the site plan. Homeowners and contractors can draw their own site plans as long as the plan is accurate, drawn to scale, and includes all the required elements such as lot dimensions, setbacks, structure locations, and easements. However, if your lot has complex topography, critical areas, or you are unsure of your exact property boundaries, hiring a licensed surveyor to establish boundary locations is strongly recommended. For structural components like decks over a certain height or retaining walls, engineered drawings signed by a Washington-licensed engineer may be required separately.
What are the setback requirements for residential properties in Bellevue, WA?: Setback requirements in Bellevue depend on your specific zoning district. For common single-family zones such as R-4 through R-10, typical setbacks are 20 feet from the front property line, 5 feet from each interior side property line, and 20 feet from the rear property line for the primary structure. Corner lots require an additional street-side setback, often 10 to 15 feet. Detached accessory structures like sheds and garages may have reduced setbacks, sometimes as little as 5 feet from the rear and side lines, but cannot be placed within easements or critical area buffers. Always verify the exact setbacks for your parcel through the Bellevue City Code or by contacting Development Services, as overlay zones can modify standard requirements.
Where do I submit my site plan and permit application in Bellevue?: Bellevue accepts most residential permit applications electronically through its online ePlans portal, which you can access through the city's Development Services website. Electronic submission is the preferred and fastest method in 2026. If you prefer or require in-person submission, you can visit the Bellevue Development Services Center at 450 110th Ave NE, Bellevue, WA 98004. The center is open during regular business hours and staff can answer questions about your application. For simple projects, limited over-the-counter review may be available. It is a good idea to call ahead at (425) 452-6875 to confirm current hours and whether your project qualifies for express review.
What happens if I build without a permit in Bellevue?: Building without a required permit in Bellevue can result in serious consequences. The city may issue a stop-work order requiring all construction to halt immediately. You may be required to obtain a retroactive permit, which often involves opening walls or exposing work for inspection, and fees for after-the-fact permits are typically doubled. Unpermitted work can also complicate or delay the sale of your home, as title companies and buyers will flag unpermitted structures during escrow. In some cases, the city can require demolition of non-compliant structures. Washington State law also allows local jurisdictions to place liens on properties with unresolved code violations, so it is always better to permit work correctly from the start.
What are the ADU rules in Bellevue, WA?: Bellevue updated its Accessory Dwelling Unit regulations in 2021, making it easier to add both attached and detached ADUs on single-family lots. Under current rules, most single-family lots can have one attached ADU and one detached ADU, subject to size limits, setbacks, and design standards. Detached ADUs are generally limited to 1,000 square feet or 50% of the primary home's floor area, whichever is less. Both attached and detached ADUs require a building permit and a complete site plan showing how the ADU fits on the lot in compliance with setbacks and lot coverage limits. Owner-occupancy requirements were relaxed under the 2021 update. Garage conversions to ADUs are popular and follow the same permitting process.
Does Bellevue have critical area or tree permit requirements that affect my project?: Yes, Bellevue has some of the most detailed critical area and tree regulations in the region. If your property is near a wetland, stream, steep slope (15% grade or greater), or wildlife habitat corridor, a critical areas review is required before grading or construction begins. Buffer distances vary by resource type and can range from 25 to 200 feet or more. Additionally, Bellevue's significant tree ordinance requires a tree permit for removal of trees meeting certain size thresholds, and replacement planting may be required. These regulations apply even to projects that would otherwise be simple, so checking your lot's critical area status early in the planning process is essential to avoid costly redesigns.

How to Create a Site Plan in Bellevue

Confirm Your Permit Requirements: Start by determining whether your project requires a permit from the City of Bellevue. Review the permit guides on the Bellevue Development Services website or call (425) 452-6875. Identify your zoning district using the city's online zoning map, and check for any critical area overlays, shoreline jurisdiction, or floodplain designations that may apply to your lot. This step prevents surprises later and helps you understand exactly what documents you will need to prepare.
Gather Your Property Information: Collect your property's legal description, lot dimensions, and a copy of your title report showing any easements. If you do not have a recent survey, you can often find lot dimensions on King County's parcel viewer or your property's recorded plat. Note the locations of existing structures, driveways, trees, and utilities. Accurate measurements are essential because Bellevue reviewers will check setback dimensions carefully, and errors are one of the most common reasons applications are returned.
Prepare Your Site Plan: Using Site Plan Creator or another tool, draw your site plan to scale (1 inch equals 20 feet is common). Include lot boundaries with dimensions, a north arrow, all existing and proposed structures with footprints, setback dimensions from structures to property lines, driveways and walkways, easements, and any critical area buffers. Label everything clearly. Calculate your total impervious surface coverage and include it on the plan if your project adds hard surface. A complete, accurate site plan is the most important factor in a smooth Bellevue permit review.
Submit Your Application Online: Log in to the Bellevue ePlans portal through the city's Development Services website and create a permit application for your project type. Upload your site plan, any required structural drawings, completed application forms, and supporting documents. Pay the required plan review and permit fees at the time of submission. Double-check that all files meet the city's naming conventions and file format requirements before submitting, as incomplete submissions will be rejected and delay your timeline.
Respond to Reviewer Comments: After submission, a Bellevue plan reviewer will be assigned to your project. For standard residential permits, expect an initial response within two to four weeks. If corrections are requested, address each comment specifically and resubmit revised documents through the ePlans portal. Prompt, thorough responses to correction requests are the best way to keep your project moving. If you are unsure about a comment, call Development Services to speak with your reviewer before resubmitting.
Receive Approval and Schedule Inspections: Once your permit is approved and issued, download and keep a copy of the permit and approved plans on site during construction. Schedule required inspections through the city's online inspection scheduling system or by phone. Common inspection stages include footing, framing, and final inspection. Do not cover work before it has been inspected and approved. After the final inspection passes, your permit will be closed and your project will be officially recognized as code-compliant by the City of Bellevue.