Washington engineering services
PE Stamp and Permit-Ready Plans in Washington
Drawings sealed by a Washington-licensed Professional Engineer for Cascadia seismic design, the Washington State Energy Code and local plan review statewide.
- Stamped by a PE licensed in Washington
- Accepted by Washington building departments
- Residential, commercial and industrial
Two climates, one demanding state code
The Cascade Range splits Washington into two very different places to build. West of the mountains, Seattle, Tacoma, Everett and Olympia sit above the Cascadia Subduction Zone and several shallow faults, on soils that range from glacial till to soft fill, with steep slopes and heavy winter rain. East of the mountains, Spokane, Yakima and the Tri-Cities see colder winters, more snow, hotter summers and wildfire. A PE stamp in Washington needs to reflect which side of the mountains your project is on.
PE Engineer prepares permit-ready drawings for homeowners, builders, architects, developers and agricultural and industrial clients across the state. Every set is sealed by a Professional Engineer licensed in Washington through our network of state-licensed engineers, and drawn to the Washington State Building Code and the local requirements of your city or county.
Western Washington work is dominated by ADUs and backyard cottages, additions, seismic retrofits of older homes, retaining walls and decks on hillside lots. Eastern Washington brings shops, pole buildings, ag processing equipment, new homes and commercial buildings. We also serve the fast-growing Vancouver area across the river from Portland.
How licensing works. Engineering drawings must be sealed by a Professional Engineer licensed in Washington. PE Engineer works with a network of state-licensed PEs, so every set we deliver is reviewed and stamped by an engineer who holds an active license in Washington. Their name and license number appear on the seal, exactly as your building department requires.
Popular in Washington
- ADUs, DADUs and backyard cottages
- Seismic retrofits of older homes
- Hillside decks, retaining walls and foundations
- Additions and second stories
- Agricultural, shop and post-frame buildings
- Commercial tenant improvements and restaurants
Engineering services for Washington projects
Structural, architectural, MEP and industrial engineering coordinated for Washington plan review.
Structural engineering in Washington
Seismic lateral design for Puget Sound sites, cripple wall and foundation bolting retrofits, steep-slope foundations and retaining walls, snow and drift design east of the Cascades, and beam and header calculations.
Architectural plans in Washington
Floor plans, elevations and site plans for ADUs, DADUs, additions, new homes and commercial spaces, drawn to the Washington State Building Code and your city's zoning and critical area rules.
MEP engineering in Washington
HVAC and heat pump design, electrical and plumbing plans, Washington State Energy Code compliance forms, solar PV drawings, fire sprinkler and alarm plans, and commercial kitchen hood systems.
Industrial and equipment stamps in Washington
Seismic anchorage for equipment, tanks and racks, platforms and mezzanines, cold storage and fruit packing support structures, and OSHA stairs, ladders and guardrails for Washington plants and warehouses.
Washington building codes we design to
The Washington State Building Code is adopted by the State Building Code Council and applies statewide, with cities and counties allowed limited local amendments. It is built on the International Codes, but Washington uses the Uniform Plumbing Code and its own energy code, which is among the more demanding in the country. Electrical work is overseen by the Department of Labor and Industries in most of the state, while some cities run their own electrical programs.
- International Building Code (IBC) with Washington amendments
- International Residential Code (IRC) with Washington amendments
- Washington State Energy Code, residential and commercial provisions
- Uniform Plumbing Code (UPC) with Washington amendments
- International Mechanical Code (IMC) and International Fire Code
- National Electrical Code (NFPA 70) and ASCE 7 for loads
Design loads and hazards in Washington
Earthquakes are the governing structural concern in western Washington. The Cascadia Subduction Zone can produce a very large, long-duration earthquake, and shallow faults such as the Seattle Fault pose risk directly beneath developed areas. Much of the Puget Sound region falls in high seismic design categories, and soft soils near the waterfront and river valleys can liquefy. Older homes with unbraced cripple walls or no foundation bolts are especially vulnerable, which is why seismic retrofits are common here. Steep slopes and saturated soils also make landslides a real hazard, and many cities regulate those sites as critical areas.
East of the Cascades, snow and frost control more of the design. Ground snow loads are significant across the Spokane area and climb sharply in mountain communities such as Leavenworth and Snoqualmie Pass. Wind along the Columbia River Gorge and open plateau can be strong, and wildfire risk is high in the dry interior. Coastal areas on the Olympic Peninsula and the outer coast also face tsunami and high wind exposure.
How the permit process works in Washington
Washington cities and counties issue building permits and perform plan review. Seattle, King County, Tacoma, Bellevue, Spokane and other large jurisdictions use online portals and detailed submittal standards, and many require geotechnical reports for steep or critical area sites. Energy code forms are a routine part of residential and commercial submittals.
- Check zoning and critical area maps for slopes, wetlands, shorelines and flood zones.
- Submit sealed architectural and structural drawings, energy code forms and any MEP plans required.
- Respond to plan review corrections. We revise and reseal within the original scope at no extra charge.
- Receive the permit, then arrange city inspections and separate electrical inspections where applicable.
State law has encouraged ADUs and middle housing in many cities, which has increased the number of backyard cottage and duplex conversion permits. A complete first submittal is the best way to keep those projects moving, because many departments now handle a large volume of small residential applications and an incomplete set can wait in line twice.
Cities and counties we serve in Washington
- Seattle
- Spokane
- Tacoma
- Vancouver
- Bellevue
- Kent
- Everett
- Renton
- Spokane Valley
- Federal Way
- Yakima
- Kirkland
- Bellingham
- Kennewick
- Olympia
- King County
- Pierce County
- Snohomish County
Plus every other city, town and county in Washington. If your project is in Washington, we can stamp it.
How it works
From first message to stamped drawings, you deal directly with the engineering team.
Step 1
Send your project
Fill out the quote form with the address, scope and any drawings, photos or plan-check comments you already have. Two minutes is enough.
Step 2
Get a fixed-fee quote
An engineer reviews the scope and replies with a clear fixed price and delivery date for your project in Washington. No hourly surprises.
Step 3
Engineering and drafting
We run the calculations, prepare the drawings to the codes your jurisdiction enforces, and check every sheet before sealing.
Step 4
Stamped set delivered
You receive the sealed PDF set ready to submit. If the plan reviewer has comments, we answer them and revise at no charge within scope.
PE stamp and permit plan FAQs for Washington
Can you provide a PE stamp for my project in Washington?
Yes. Washington projects are stamped by a PE licensed in Washington through our network of state-licensed engineers. The seal includes the engineer’s name and license number, and the structural calculations are packaged with the drawings for your city or county reviewer.
Do you design ADUs and backyard cottages in Seattle?
Yes. We prepare complete ADU and DADU plan sets for Seattle and other Puget Sound cities, including site plans, architectural drawings, structural calculations and energy code forms, and we check the zoning rules for your lot before design starts.
Can you retrofit an older Washington home for earthquakes?
Yes. We design foundation bolting, cripple wall bracing, hold-downs and connections for older homes, and more extensive upgrades for masonry chimneys or split-level houses. Retrofit drawings can be submitted on their own or combined with a remodel or addition.
Do you prepare Washington State Energy Code documents?
Yes. We prepare the energy code compliance documentation required for residential and commercial projects, coordinated with the mechanical design and the envelope details on the architectural drawings, so the reviewer sees one consistent approach. For what that documentation covers, see our energy code compliance service.
Do you work in eastern Washington?
Yes. We prepare plans for Spokane, the Tri-Cities, Yakima, Wenatchee and rural counties, including shops, post-frame buildings, new homes, ag processing support structures and commercial projects designed for local snow and wind loads. Fixed-fee quotes usually go out the same day, and most residential sets are delivered within a few business days.