Seattle's chimney repair rule, Director's Rule 5-2004, explained

Seattle Fireplace & Chimney · October 15, 2026

Why Seattle has a chimney rule

Director's Rule 5-2004, titled Alteration and Repair of Unreinforced Masonry Chimneys, took effect on December 1, 2004 and replaced an earlier 2002 rule. Its background section explains that many unreinforced chimneys were damaged in the 2001 Nisqually earthquake, creating a falling hazard, and that the city then required damaged chimneys to be reinforced, braced, removed or replaced with a factory-built chimney. DR 5-2004 extends that policy to every chimney alteration and repair, quake or no quake.

The rule is written for permit reviewers and contractors, so it reads densely. Below is what it means for a homeowner. One caution first: we have not been able to confirm whether the rule has since been revised, and a newer draft may exist. Treat this as a guide and confirm current requirements with Seattle's Department of Construction and Inspections (SDCI) before work starts.

The $4,000 line

Under DR 5-2004, chimney repair that costs the owner less than $4,000 does not need a building permit. That does not mean the rule stops applying. The work still has to meet it. Minor patching is the one thing exempt from both the permit and the rule.

Work that goes below the top of the smoke chamber, the sloped section just above the fireplace opening, is a different matter. Then the smoke chamber and chimney must be fully rebuilt to current code and a building permit is required whatever the cost.

Reinforce, brace, or replace

The core of the rule: any alteration or repair has to use reinforced masonry, or replace the chimney with a factory-built metal chimney. There are two exceptions.

First, work confined to the top 2 feet of the chimney may be replaced in kind, meaning rebuilt the way it was. This is the common case: a crumbling cap course, loose top bricks, a new crown. Second, if a chimney is too small to reinforce, it may be rebuilt unreinforced, but if it stands more than 3 feet above the roof it has to be externally braced to the roof structure.

Two height limits run through the rule. A chimney more than 3 feet above the roof must be supported at a minimum of two points. A chimney more than 12 feet above the roof must be designed by an engineer, and even a top-2-feet repair on a chimney that tall still requires external bracing. Any unreinforced masonry left in place has to be inspected and tuckpointed where needed.

The five repair options in the rule

DR 5-2004 lays out five ways to bring a chimney into compliance. Which one fits depends on how much of the chimney is damaged and whether you still burn wood.

• Rebuild in reinforced masonry from the floor line below the roof, tied to the house at the roof and floor.
• Rebuild in reinforced masonry from the top of the smoke chamber.
• Rebuild from just below the roofline and add an external roof brace.
• Replace everything above the smoke chamber with a listed metal chimney, which may be enclosed in a steel-stud chase.
• Use an engineered design.

Inspections and a warning about water heaters

When a permit is required, the rule calls for inspections after demolition, before the concrete for the bond beam is poured, and at completion. Plan the schedule around those; the crew cannot close up work the inspector has not seen.

The rule also warns that a chimney may be venting a gas water heater, not just the fireplace. Capping or removing a flue without checking can send exhaust back into the house. If it does vent an appliance, a furnace or water heater liner typically runs $625 to $2,250.

What it costs, and outside Seattle

Typical 2026 ranges: rebuilding the top few courses $1,000 to $3,500, a full rebuild above the roofline $5,000 to $15,000 or more, general chimney repair $300 to $3,500, and repointing $500 to $2,500. Our inspection is free. We look at the chimney top to bottom, photograph it, tell you which part of the rule the work falls under, and give you a written price before any work.

DR 5-2004 is a City of Seattle rule only. Bellevue requires a permit for installing a zero-clearance fireplace, insert or pellet stove, and unincorporated King County requires one when a fireplace or wood stove is installed or replaced. FEMA's guide to earthquake damage (E-74) cites the Seattle rule as a model, so it is a sensible standard even where it is not required.