Mountlake Terrace, Washington Building Permit Guide

Mountlake Terrace’s Community Development department issues building permits and also runs its own electrical permit and inspection program, so wiring, plumbing, mechanical and fire permits all come from the City as well. Every application goes through the eTRAKiT Permit Portal, and inspections can only be booked there. Under the fee schedule effective June 1, 2026, building fees are set in multiples of a $218 hourly rate, plan review adds 65% and a 5% technology fee applies to the total.

Permit staff work from City Hall, 23204 58th Avenue West, on Monday from 8 a.m. to 3 p.m. and Tuesday to Thursday from 8 a.m. to 4 p.m., and are closed on Fridays. The Building Official, inspectors, planners and plan reviewers are at the counter only from 8 to 9 a.m., Monday to Thursday, or by appointment. Questions go to permitspecialist@mltwa.gov or buildingquestions@mltwa.gov; the City Hall line is 425-776-1161. The city had 25,430 residents in the Census estimate for 2025.

Mountlake Terrace issues permits only for work inside its city limits.

What requires a building permit in Mountlake Terrace?

The City’s code (MTMC 15.05.210) requires a permit to build, alter, repair, move or demolish a building and to install or change any electrical, gas, mechanical or plumbing system. Its construction permit FAQ lists the jobs that always need a permit.

Two points need care. On October 1, 2026 the City Council adopted an accessory structure exemption ordinance (in force five days after publication) that replaces the old 80 sq ft limit: under the residential code, a one-story detached accessory structure needs no building permit if it is 200 sq ft or less, has walls no more than 8 feet from floor to top plate, a ridge no higher than 12 feet and is used only for unheated storage; staff described the limit for other buildings as the building code’s 120 sq ft. The City’s FAQ and the online code still show 80 sq ft until they are updated. And while the FAQ says replacing or adding a fence needs a permit, the June 2026 fee schedule lists no fee (“N/A”) for residential fences under 6 feet in a rear yard or under 4 feet in a front yard.

What the city decides and what the state holds

The building, residential, mechanical, plumbing and energy codes are the state’s 2021 editions. The City adds its own amendments: the shed exemption, the state’s residential fire sprinkler appendix applied to one-family houses of 3,000 sq ft or more, a rule that additions and alterations worth more than half a house’s assessed value within three years (five in the Town Center zones) bring the house up to new-building safety standards, and underground power and wireline service when a project worth more than half the assessed value also changes the electrical service. Electrical work follows the 2023 National Electrical Code and the Washington Cities Electrical Code as the City enforces them.

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 program or Tacoma Power serves the site. Building codes in Washington

Mountlake Terrace building department: who handles permitting

Community Development reviews and issues building, electrical, mechanical, plumbing and fire permits, and its inspectors do the inspections. Engineering construction permits (right-of-way, utilities, drainage) and land use approvals are separate applications. A design professional licensed in Washington must prepare the plans for any building with five or more homes or any building over 4,000 sq ft.

Permit types

Residential permits

The portal lists separate applications for a residential building permit, an ADU, an adult family home, demolition, a wall, retaining wall or rockery, residential mechanical and plumbing, residential fire, and an electrical permit with a homeowner affidavit. Kitchen and bathroom work that goes no further than removing drywall can use the Minor Residential Remodel permit: one permit covers up to three spaces, such as two bathrooms and a kitchen, at $505 per space, with no plan review, but no framing, layout or structural change is allowed. The City then checks smoke and carbon monoxide alarms at the final inspection.

A full residential building application needs building plans (existing and proposed floor plans, sections, framing sizes, footing and roof drains), a site plan with two-foot contours, natural grade elevations from a licensed land surveyor and any critical areas within 200 feet, mechanical and plumbing device checklists, and where they apply a critical areas report, structural calculations, energy code forms, a drainage report and a soils report. Remodels usually need a hazardous materials survey with proof it was sent to the Puget Sound Clean Air Agency. A site must have an address before a permit can be approved.

Building or remodeling a home here? Alliance handles residential permit filing, so the crew isn't waiting on the counter.

Commercial permits

Commercial building, electrical, mechanical, plumbing, fire, sign, fencing and temporary use permits each have their own application. The City’s IBC amendments require sprinklers in new buildings with a fire area of 5,000 sq ft or more and in mixed-use buildings containing homes. Commercial and multifamily electrical, mechanical and plumbing permits are priced from the valuation table, plus 65% plan review; a commercial certificate of occupancy has a 2-hour minimum and a temporary one costs $3,000.

For tenant improvements and new commercial builds, Alliance handles commercial permit expediting through issuance. More on this: commercial building permits explained.

What comes before the building permit

Land use approvals, critical area reports for wetlands, streams or geologic hazards, engineering construction permits for work in the street and utilities, and a water meter request or fire flow certificate may all be needed before a building permit is issued. New homes also pay impact fees and a stormwater capital facility charge.

Mountlake Terrace permit costs and fees

The Building, Electrical and Fire-Related Permit Fees schedule, adopted by Council resolution on May 21, 2026 and effective June 1, 2026, sets most fees as a number of hours at the 2026 rate of $218, under a code section (MTMC 3.150.090) that adjusts development fees each year by the Seattle-area consumer price index. New construction is valued from the ICC building valuation data; other work by the City’s table, with the value checked by the Building Official. On October 1, 2026 the Council also adopted a new development fee schedule with flat engineering and land use fees from January 1, 2027; building fees were not part of it.

Worked example. A $60,000 remodel falls in the $50,000.01 to $100,000 band: 5¼ hours at $218 ($1,144.50) plus 10 × $10.10 ($101) is a permit fee of $1,245.50. Plan review at 65% adds $809.58, making $2,055.08; the 5% technology fee on that is $102.75, and the $6.50 state fee is added on top, before any electrical, mechanical or plumbing permit.

The impact fee schedule effective January 1, 2026 charges a new detached house $8,160 for transportation, $4,731 for parks if it has three bedrooms ($5,674 with four or more) and a stormwater capital facility charge of $3,275; an ADU pays $4,080 for transportation and half the park fee.

Trade permits and who may pull them

Mountlake Terrace is on L&I’s list of cities that run their own electrical program, so electrical permits are bought from the City, not the state. Fees are hour-based: a house remodel or addition is a 2.25-hour minimum ($490.50, two inspections), a remodel with a service or panel change or a new house 3.25 hours ($708.50, three inspections), a service or panel change alone 1.25 hours ($272.50), and adding or changing up to three circuits 1.25 hours. A homeowner doing their own wiring files the City’s electrical work affidavit, which follows the state owner exemption in RCW 19.28.261. Mechanical and plumbing permits are also the City’s, at $218 for up to four fixtures.

How to apply for a Mountlake Terrace building permit

Review, corrections and what causes delay

The City’s typical timelines to first comments are the same day for over-the-counter permits, 4 to 6 weeks for residential and 6 to 8 weeks for commercial permits, and 2 weeks for revisions. Files named the wrong way cause delays, and a staff member checks every submittal against its checklist before review starts; anyone who thinks a checklist item does not apply should ask the department before submitting, and a pre-application conference is strongly recommended for waivers. Additional plan review for changes is charged at a 2-hour minimum.

Inspections in Mountlake Terrace

All inspection requests go through the online Permit Portal; phone requests are no longer accepted, and only holders of active permits can book. A request made before 3 p.m. is scheduled for the next business day, and one made after 3 p.m. for the second business day; inspection questions go to 425-744-6267. Footing inspections, for example, are made after forms are set and steel placed but before concrete is poured. Every permit needs a passed final inspection to be legally complete. A permit expires if no inspection is made within 180 days, and each passed inspection extends it by another 180 days; an expired permit can be reactivated by a written request to a Permit Specialist giving a valid reason.

Inspections beyond those included cost one hour each, and those outside business hours have a 2-hour minimum. Covering work before it is inspected, failing to correct electrical items within 15 days, or not calling for an inspection within 5 days of finishing are each penalized at $250, then $1,000, then $2,000.

Mountlake Terrace permit search and official resources

The eTRAKiT portal lets permit holders follow their applications and inspections; for older permit records, contact a Permit Specialist or the City’s Public Records Officer. Mountlake Terrace participates in the National Flood Insurance Program, and FEMA’s status book gives June 19, 2020 as its current map date.

• Mountlake Terrace building permits and applications
• Permits and licenses: hours, timelines, minor remodel permit
• eTRAKiT Permit Portal
• Permit FAQs and fee schedules
• Building, electrical and fire permit fees, effective June 1, 2026 (PDF)
• Impact fee schedule 2026 (PDF)
• Construction permit FAQ (PDF)
• Building residential permit checklist (PDF)
• Minor bathroom and kitchen remodel permit checklist (PDF)
• Electrical work affidavit for homeowners (PDF)
• Building permit steps flow chart (PDF)
• Mountlake Terrace Municipal Code (Title 15, buildings)
• L&I list of cities that issue electrical permits

Mountlake Terrace building permit FAQ

Who issues building and electrical permits in Mountlake Terrace?

The City’s Community Development department issues both, along with mechanical, plumbing and fire permits, through the eTRAKiT Permit Portal.

Do I need a permit to re-roof or replace windows?

Yes. The City’s FAQ lists roofing and window and siding installation among the jobs that always need a permit.

Can I remodel a bathroom without plan review?

Yes, with the Minor Residential Remodel permit, if the work stays within existing walls and layout and changes no framing: $505 per space, up to three spaces.

How much does a building permit cost?

A $60,000 remodel has a permit fee of $1,245.50 and plan review of $809.58 in 2026, plus the 5% technology fee and the $6.50 state fee.

How long does review take?

About 4 to 6 weeks to first comments for residential permits and 6 to 8 weeks for commercial ones; over-the-counter permits are issued the same day.

Can I call to book an inspection?

No. Inspections are requested only through the online Permit Portal.

Is the permit counter open on Fridays?

No. Permit staff are closed on Fridays and work Monday 8 a.m. to 3 p.m. and Tuesday to Thursday 8 a.m. to 4 p.m.

Simplify Mountlake Terrace permitting with Alliance Permitting

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 Mountlake Terrace permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.