Building Code
Building codes set minimum safety and quality standards for construction. Learn why compliance matters for buyers, sellers, and renovators.
Definition
Building codes are regulations established by local or national government entities that set minimum standards for construction safety, durability, and habitability. Codes cover structural integrity, electrical systems, plumbing, fire safety, accessibility, and energy efficiency. Homes must adhere to building codes during new construction and major renovations. Buyers should verify that modifications have been permitted and inspected, while sellers may need to bring unpermitted work up to code before listing. Failure to comply with building codes can delay transactions, void insurance coverage, or result in costly fines and repairs.
Why It Matters
Unpermitted work is a closing problem, not a philosophical one. A finished basement bedroom with no egress window and no permit can be stripped from the square footage on the appraisal, refused by an insurer, and flagged by the lender as a funding condition, all in the same week. Washington sellers must disclose known unpermitted improvements on Form 17, and staying quiet invites a claim after closing.
Examples
A garage was converted to living space in 2019 without a permit. The buyer's lender requires it permitted or restored before funding, and the retroactive permit plus code upgrades runs $14,000 and six weeks.
In a 1962 house, the inspector flags a subpanel the owner wired himself. The buyer's insurer declines to bind coverage until a licensed electrician corrects it under permit.
A homeowner builds a deck 30 inches off the ground, above her jurisdiction's threshold for exempt work, and needs a permit and a footing inspection she never budgeted.
Tips
Pull the permit history for the address from the city or county before you list, or before you write an offer. Most Washington jurisdictions have it searchable online at no cost and it takes ten minutes.
If work was done without a permit, price the retroactive permit into the deal instead of hiding it. Legalization is judged against today's code, so the cost is real and the buyer will find it.
Compare the permit record against the listing's square footage and bedroom count. A bedroom that exists on the MLS but not on the county record is the exact mismatch that kills financing.
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