Building code

Key Takeaways

• Washington's State Building Code Act, chapter 19.27 RCW, exists to promote the health, safety, and welfare of the people who use buildings and of the general public.
• RCW 19.27.031 adopts national model codes as Washington law, including the International Building Code, the International Residential Code, the International Fire Code, and the Uniform Plumbing Code.
• The state building code is enforced by counties and cities, and a jurisdiction with no building department must contract the work out (RCW 19.27.050).
• Under RCW 19.27.095, a valid and fully complete building permit application is reviewed under the ordinances in effect on the day it was filed, not the day the permit is issued.

What It Means

A building code is a set of minimum standards for how a structure is built and what it is built from. It covers framing, foundations, wiring, plumbing, mechanical systems, fire protection, and exits, and it is enforced through permits and inspections rather than through a lawsuit after the fact. Washington's version says the goal out loud: promote the health, safety and welfare of the occupants or users of buildings and structures and the general public, using minimum performance standards consistent with accepted standards of engineering, fire and life safety.

Building codes are one expression of Police Power, the government's authority to regulate private property for public health and safety. They sit alongside Zoning, the Comprehensive Plan, and subdivision rules as the tools that shape what gets built on a parcel. The division of labor is worth memorizing: zoning decides what use goes where and how big it can be, while the building code decides how the structure itself must be assembled.

For brokers, the code surfaces as permit history. Unpermitted additions, a converted garage, or a finished basement without a permit can stall an appraisal, a loan, or an inspection response.

How It Works in Washington

Chapter 19.27 RCW is the State Building Code Act. RCW 19.27.020 sets the purpose, which is to promote the health, safety and welfare of building occupants and the general public through building codes applied throughout the state. RCW 19.27.031 does the heavy lifting by adopting the model codes as state law: the International Building Code, the International Residential Code, the International Mechanical Code, the International Fire Code, portions of the International Wildland Urban Interface Code, and the Uniform Plumbing Code and standards. Washington does not draft its own construction code from a blank page.

Enforcement is local. RCW 19.27.050 says the state building code shall be enforced by the counties and cities, and a county or city without a building department must contract with another county, city, or an approved inspection agency. One timing rule matters to buyers of development property: RCW 19.27.095 provides that a valid and fully complete building permit application is considered under the building permit ordinance and land use rules in effect on the date of application. For projects over $5,000 that application must carry the legal description or tax parcel number, the owner's contact information, and the prime contractor's state registration number. Our due diligence walkthrough covers how to work permit history into a due diligence checklist, and our Form 35 guide explains how findings feed the inspection response.

Example

Nadia Farrell buys a vacant lot in Everett for $189,000 and plans a 1,900 square foot house. Because the project costs well over $5,000, her contractor's building permit application lists the tax parcel number, Nadia's name, address, and phone number, and the contractor's Washington contractor registration number. The city accepts the application as valid and fully complete on May 2. On July 1 the city adopts a stricter local amendment that would have added roughly $14,000 to the build. Under RCW 19.27.095, Nadia's project is still reviewed under the building permit ordinance and land use rules that were in effect on May 2, so the July amendment does not apply to her application. Her neighbor, who filed on July 9, is reviewed under the new rules and pays the extra cost.

Common Mistakes and Exam Traps

• Building codes and zoning are different tools. Zoning controls the permitted use, density, height, and setbacks on a parcel; the building code controls how the structure is constructed.
• Washington does not write its construction code from scratch. RCW 19.27.031 adopts national model codes, which the state then amends.
• The code is state law but enforcement is local. Counties and cities issue permits and perform inspections under RCW 19.27.050.
• Permit applications vest on the filing date, not the issue date. RCW 19.27.095 ties the review to the ordinances in effect when the valid and fully complete application was filed.