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Mechanical permit — Mountlake Terrace, Washington · Requirements sheet
Verified 2026-09-16 · Source: https://ecode360.com/48217328
PermitBase is an independent reference and is not affiliated with any government agency. Requirements change and vary by project — confirm current details with the building department before you submit.
Mechanical permit in Mountlake Terrace, Washington
Permit to install, alter, repair, convert or replace mechanical systems in Mountlake Terrace, under the International Mechanical Code adopted at MTMC 15.05.080.
Verified 2026-09-16 · Source
When you need this permit
- MTMC 15.05.030(C) adopts the “International Mechanical Code, 2021 Edition, published by the International Code Council, with state of Washington amendments”, and MTMC 15.05.080 adopts the same year.
- MTMC 15.05.210 names mechanical systems expressly: no person may “erect, install, enlarge, alter, repair, convert, or replace any electrical, gas, mechanical or plumbing system” regulated by the chapter without first applying to the Building Official and obtaining the permit.
- Mechanical permit and plan check fees are adjusted annually on building valuation data under MTMC 3.150.090(D), separately from the CPI adjustment that applies to fees generally.
Required documents
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Fee schedule
Permit fee
No dollar figure is published in the municipal code. Show full citationHide
No dollar figure is published in the municipal code. MTMC 15.05.220(A) says permit fees “are established pursuant to MTMC § 3.150.090”, and 3.150.090 sets a mechanism rather than an amount: schedules “shall be established annually”, fees “shall be based upon a cost of service study completed every three years”, and they are “adjusted annually, based on the Seattle Area Consumer Price Index (CPI)” for All Urban Consumers over one 12-month period. Building, plumbing, mechanical and electrical permit and plan check fees are separately “adjusted annually based upon building valuation data or otherwise recognized sources”. Ask the city for the current schedule; it is not derivable from the code.Set by annually adopted fee schedule
Review timeline
Plan review
Not published — contact the department
Inspection process
Tips
- Mechanical work is one of the four systems MTMC 15.05.210 names individually, so replacing equipment in an existing building is permit work in its own right even when no building permit is involved.
Frequently asked questions
Mountlake Terrace requires a mechanical permit for: MTMC 15.05.030(C) adopts the “International Mechanical Code, 2021 Edition, published by the International Code Council, with state of Washington amendments”, and MTMC 15.05.080 adopts the same year.; MTMC 15.05.210 names mechanical systems expressly: no person may “erect, install, enlarge, alter, repair, convert, or replace any electrical, gas, mechanical or plumbing system” regulated by the chapter without first applying to the Building Official and obtaining the permit.; Mechanical permit and plan check fees are adjusted annually on building valuation data under MTMC 3.150.090(D), separately from the CPI adjustment that applies to fees generally.. If your project isn't listed, confirm with City of Mountlake Terrace Community Development Department at (425) 776-1161 before starting work.
No. The code sets a mechanism, not an amount: MTMC 3.150.090 has fee schedules established annually, rebuilt from a cost-of-service study every three years, with mechanical permit and plan check fees adjusted annually on building valuation data.
Mountlake Terrace does not publish a plan-review timeline for this permit. Contact City of Mountlake Terrace Community Development Department at (425) 776-1161 for current turnaround.
You'll need: Permit application. Depending on your project, Mountlake Terrace may also ask for: Plans prepared by a licensed professional where required; Performance guarantee where improvements are required. See the required-documents checklist on this page for details on each.
Apply through City of Mountlake Terrace Community Development Department at 23204 58th Avenue W, Mountlake Terrace, WA 98043. Phone: (425) 776-1161, email: permitspecialist@mltwa.gov. Office hours: Permit staff: Monday 8:00 a.m. to 3:00 p.m., Tuesday to Thursday 8:00 a.m. to 4:00 p.m., closed Friday.. Official information: https://www.cityofmlt.com/1993/Permits-Licenses.
Mountlake Terrace, Washington has adopted: IBC — MTMC 15.05.030(A): “International Building Code, 2021 Edition, published by the International Code Council, with state of Washington amendments”. Its own adopting section, 15.05.040, also names 2021.; IRC — MTMC 15.05.030(B): “International Residential Code, 2021 Edition, published by the International Code Council, with state of Washington amendments”. Its own adopting section, 15.05.060, also names 2021.; IMC — MTMC 15.05.030(C): “International Mechanical Code, 2021 Edition, published by the International Code Council, with state of Washington amendments”. 15.05.080 agrees.; IFC — MTMC 15.05.030(D) names the 2021 Edition “as adopted in Chapter 15.10 MTMC”, and 15.10.010 independently names “The International Fire Code (‘IFC’), 2021 Edition, as published by the ICC, together with any additions, deletions and exceptions currently enacted or as may be amended from time to time by the state of Washington, as set forth in Chapter 51-54A WAC”. The two agree.; UPC — MTMC 15.05.030(E): “Uniform Plumbing Code, 2021 Edition, with state of Washington amendments, and Uniform Plumbing Code Standards, published by the International Association of Plumbing and Mechanical Officials”. 15.05.090 agrees.; International Performance Code for Buildings and Facilities — MTMC 15.05.030(F), 2021 Edition. 15.05.100 agrees.; International Green Construction Code — MTMC 15.05.030(G) lists it at the 2021 Edition, BUT ITS OWN ADOPTING SECTION, 15.05.110, READS “Reserved.” A code reviser's note records that Ordinance 2621 removed the Uniform Housing Code provisions and reserved the section for the IGCC. The list names it; the section is empty.; IFGC — MTMC 15.05.030(H): “International Fuel Gas Code, 2021 Edition, published by the International Code Council, with state of Washington amendments”. 15.05.120 agrees.; Electrical — MTMC 15.05.030(I) adopts TWO codes at TWO YEARS in one lettered item: “National Electrical Code, 2023 Edition, published by the National Fire Protection Association; and the Washington Cities Electrical Code, 2020 Edition, published by Washington Association of Building Officials”. 15.05.130 adds a third instrument, the state “Department of Labor and Industries, Electrical Inspection Section, Rules and Regulations for Installing Electric Wiring and Equipment”.; IECC — MTMC 15.05.030(J), 2021 Edition.; IEBC — MTMC 15.05.030(K), 2021 Edition. 15.05.155 agrees.; Accessibility — MTMC 15.05.030(L): “Washington State accessibility provisions for physically disabled or elderly persons as provided in RCW 70.92.100 through 70.92.160”. No edition year, because the instrument is a statute.; Uniform Code for Abatement of Dangerous Buildings — MTMC 15.05.030(M), “1997 Edition, published by the International Conference of Building Officials”. THE OLDEST EDITION YEAR ANY CITY IN THIS WASHINGTON SERIES NAMES.; IPMC — MTMC 15.05.030(N), 2021 Edition.; WSEC — MTMC 15.05.030(O) says “Washington State Energy Code (Commercial and Residential), 2021 Editions”, BUT 15.05.160 says “the Washington State Energy Code, 2018 Edition, with any amendments established by Chapters 51-11C and 51-11R WAC, as now exist or shall be amended”. BOTH ARE RECORDED AND NEITHER IS ADJUDICATED.. Local amendments apply — see the Mountlake Terrace overview page for the full list.
Sources & verification
Verified against official sources. Last reviewed 2026-09-16.
Fee schedules
Codes & ordinances
Department & other records
Fees, timelines, and adopted codes are researched from each jurisdiction's published records — see how we verify. Requirements change and vary by project, so always confirm the current details with the Mountlake Terrace building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.
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