Whatcom County, Washington Building Permit Guide

Whatcom County runs from Puget Sound to the Cascade crest along the Canadian border, with more than 400 miles of shoreline inside it. Two things shape permitting here that shape it almost nowhere else: the water, and the border.

Planning and Development Services handles building and land use permitting for unincorporated Whatcom County, with permitting within any city jurisdiction handled solely by that city. Applications go in through the county’s online Customer Service Portal or by email — paper submittals are not accepted — and inspections are requested through the same portal, the inspection hotline having been discontinued in April 2025.

This guide covers unincorporated Whatcom County. Bellingham is incorporated and permits separately, and is covered elsewhere in this series. Ferndale, Lynden, Blaine, Everson, Nooksack and Sumas also handle permitting within their own limits.

What requires a building permit in Whatcom County?

Washington has a mandatory statewide building code. The codes enumerated in chapter 19.27 RCW, the State Building Code Act, are adopted and amended by the State Building Code Council within the Department of Enterprise Services, and they are required in all cities and counties — local government administers and enforces them rather than deciding whether to have them. A city or county may make the state code stricter but cannot opt out of it, and local changes affecting houses or apartments need State Building Code Council approval. So the question in Whatcom County is not whether a code applies, but which edition is in force and what Whatcom County Planning and Development Services has added to it.

Local amendments, fee schedules and exempt thresholds differ from one jurisdiction to the next, so an exempt list from a neighbouring city is not reliable. An exemption from a building permit is never an exemption from zoning, critical areas review, the energy code or a trade permit. Confirm scope with Whatcom County Planning and Development Services before work starts.

Local rules worth knowing

The border produces an unusual requirement: all structures moved from out of state or out of the country require a pre-move inspection performed by a Washington State licensed engineer, and the pre-move inspection form may only be obtained from the planning and development office — with the building permit application to move the structure following only once that inspection is complete and the building approved for the move

Washington has a mandatory statewide building code under chapter 19.27 RCW that every city and county enforces and may make stricter; electrical permits come from the Department of Labor and Industries unless the city runs its own programme or Tacoma Power serves the site. Building codes in Washington

Who handles permitting in Whatcom County?

Planning and Development Services issues building and land use permits for unincorporated Whatcom County, and recommends that most applicants research the land use requirements of a property before moving forward to a building permit.

The shoreline reaches further than people expect. The department notes there are over 400 miles of different shoreline types in the county, and that a property on one of them or within its buffer has different permitting requirements as a result — which is why land use research is recommended before the building permit rather than alongside it.

The Site Plan Review application is optional but designed to save money. It assists in designing the project footprint, the placement of structures and infrastructure such as septic tanks and fire truck turnarounds, and defines areas to be avoided such as streams and wetlands. Conducting one in advance lets a building permit start with an already-approved site plan, avoiding potentially expensive and lengthy redesigns later.

Permit types

Residential permits

Decks and walking surfaces over 30 inches above grade require building permits, with detailed plans including elevation drawings of all four sides at a defined scale. A building permit is required to construct a new foundation under an existing or moved building, and accessory dwelling units follow the same submittal process as a single family residence but are not allowed in all zones.

How Washington contractor credentials work

Commercial permits

Plumbing and mechanical permits are stand-alone forms, and provided the work is not for a commercial purpose they require no master application, land use permit, site or building plans or additional submittal materials — which makes a straightforward fixture replacement considerably lighter than the full process.

Registrations, trade certifications and design professionals

Three credential layers appear on Washington projects: the state contractor registration under chapter 18.27 RCW, which nearly everyone doing the work needs; separate state trade certification for electricians and plumbers, each examined and administered by its own programme; and, on commercial and larger residential work, drawings stamped by a Washington-licensed architect or professional engineer. Confirm what Whatcom County Planning and Development Services requires for the specific building before filing.

Most Washington contractors register with the Department of Labor and Industries (with a surety bond and insurance) rather than holding a licence; electrical and plumbing contractors also need an L&I contractor licence. Contractor licensing in Washington

Whatcom County permit costs and fees

Whatcom County publishes a unified fee schedule covering planning, engineering and environmental health. The flood damage repair fee waiver runs until applications close at the end of December 2026, and the county warns of a scam distributing false invoices — check fees through the customer portal, and the county never requests payment by wire transfer.

Washington sets the code statewide but leaves the fee schedule local, so two jurisdictions on the same edition can price the same project very differently. The electrical fee is the one that most often surprises people, because it is paid to L&I rather than with the building permit. Ask Whatcom County Planning and Development Services for the schedule in force on your filing date, and confirm the electrical route separately.

Fees are set locally, plus a small state permit fee (RCW 19.27.085); the electrical fee goes to whichever body issues the electrical permit. Permit fees in Washington

Trade permits and who may pull them

Plumbing and mechanical permits are local; electrical permits come from the Department of Labor and Industries unless the city runs its own electrical programme or Tacoma Power serves the site. Trade permits in Washington

How to apply for a Whatcom County building permit

Review, corrections and what actually causes delay

In Washington the first cause of delay is the energy code, because the state code is its own instrument and more demanding than the international one most designers default to. After that comes critical areas review, which reaches ordinary residential work near wetlands, streams, steep slopes and shorelines and adds its own study and mitigation timeline. Then the electrical split, where a project waits on a local inspection that was never going to happen because the electrical permit sits with L&I. Then edition confusion around the switch-over date, when a new state edition takes effect and local amendments change with it. Build review time into the schedule and confirm the checklist with Whatcom County Planning and Development Services before filing.

The state code sets a 180-day default for permit validity, but Whatcom County may change it, so confirm the expiry on phased or delayed work. Permit validity in Washington

Inspections in Whatcom County

Where a permit is required, standard checkpoints include footing and foundation, framing, rough-in plumbing and mechanical, insulation and energy code compliance, fire systems on commercial work, and final, with a certificate of occupancy before the building is used. Required items must be on site at the time of inspection, and moved structures carry their own sequence beginning with the engineer’s pre-move inspection rather than with the county.

The point to plan around is that the electrical inspections may be booked with a different body entirely. Because L&I holds the electrical permit here, its inspector attends on the state’s schedule and the local inspector will not sign off electrical work. Sequencing a cover-up around two independent inspection queues is the practical skill on a Washington job.

Do not cover work before the required inspection has been approved. Keep the issued permits — plural — the approved plans and the energy code documentation available on site.

Whatcom County permit search and official resources

Permit records in Washington are split the same way the permits are. Where Whatcom County Planning and Development Services is the authority for unincorporated Whatcom County, it holds the building, plumbing and mechanical records — while the electrical record sits with the state Department of Labor and Industries (L&I), which issues the electrical permits and carries out the electrical inspections here. If you are buying, refinancing or renovating, check both, because a clean local record does not mean the electrical work was ever permitted.

These are the primary sources behind this guide. Codes, fee schedules and procedures change — confirm the position for your filing date.

• Whatcom County Planning and Development Services
• Whatcom County Building Services permit center
• Whatcom County residential buildings
• Labor and Industries contractor laws and rules
• RCW 19.27A.020, state energy code adoption

Frequently asked questions

Are flood repair permits really free?

The fees are waived, yes. The County Executive is waiving permit fees within unincorporated Whatcom County for applications related to flood damage repairs from the December 2025 flood event, and those applications must be received before the end of December 2026.

I am moving a building in from Canada. What do I need?

A pre-move inspection first. All structures moved from out of state or out of the country require a pre-move inspection performed by a Washington State licensed engineer, on a form that may only be obtained from the planning and development office. Once the inspection is complete and the building approved for moving, you may apply for the building permit.

Why does the shoreline matter so much here?

Because there is so much of it. The county notes over 400 miles of different shoreline types, and a property on one of them or within its buffer has different permitting requirements, which is why land use research is recommended before applying for a building permit.

Do I need a permit for a deck?

Decks and walking surfaces over 30 inches above grade require building permits, with detailed plans including elevation drawings of all four sides at the specified scale.

Which code edition applies?

The state edition as amended by the county. Washington has a mandatory statewide building code. The codes enumerated in chapter 19.27 RCW, the State Building Code Act, are adopted and amended by the State Building Code Council within the Department of Enterprise Services and are required in all cities and counties, so local government administers and enforces them rather than choosing whether to have them. The 2021 editions took effect on the fifteenth of March, 2024 after two delays, and the 2024 editions are dated to take effect on the third of May, 2027. The state adopts a new edition every three years and reviews the codes in two groups, but all of them take effect on the same date (the 2021 codes on 15 March 2024, the 2024 codes on 3 May 2027). A city or county may make the state code stricter but cannot opt out of it; local changes affecting houses or apartments need State Building Code Council approval, and the residential energy code cannot be changed locally.

Who registers my contractor?

The state. Most Washington contractors register rather than hold a licence; electrical and plumbing contractors must also hold an L&I contractor licence. Under chapter 18.27 RCW a contractor registers with the Department of Labor and Industries, files a continuous surety bond of $30,000 as a general contractor or $15,000 as a specialty contractor, and keeps liability insurance on file, renewing every two years. Registration is not a competence test and does not authorise trade work: electrical certification comes under chapter 19.28 RCW and plumbing under chapter 18.106 RCW. The electrical permit comes from the state, because the Electrical Program at the Department of Labor and Industries (L&I) issues electrical permits and carries out electrical inspections here under chapter 296-46B WAC.

Simplify Whatcom County permitting with Alliance Permitting

A fee waiver with a closing date and a shoreline that reaches inland are both timing questions. We answer them before the application, not after.

Trusted by leading builders, developers, and national contractors — 21+ years of filing in the jurisdictions we write about.

Contractors and builders choose Alliance for Whatcom County because the work is done by people who have stood at the counter:

• 21+ years of filing, so the edition and the electrical route are settled before submission
• We confirm which state code group governs each part of the work on your filing date
• State contractor registration, bond and insurance verified as active before filing
• Energy code and critical areas documentation prepared rather than discovered in review
• Two inspection queues sequenced so a cover-up never waits on the wrong inspector

Alliance Permitting is a permit documentation and submission company in Washington. We prepare your paperwork, file it correctly and coordinate with the permitting authority through issuance. We are not a contractor and we do not perform licensed plan review or inspections; that work stays with your licensed team and the jurisdiction.

This guide is provided by Alliance Permitting for general information about Whatcom County permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.