Lake Oswego, Oregon Building Permit Guide

Inside Lake Oswego city limits, the City of Lake Oswego Building Department issues building, electrical, plumbing and mechanical permits. Applications go through Oregon’s ePermitting system, by email to permits@lakeoswego.city, or to the counter between 8 a.m. and noon. The 2026 fee schedule charges $102.82 for work valued up to $2,000, adds plan review at 65% of the permit fee, and puts the state’s 12% surcharge on every permit fee.

The department sits in the Permit Center on the second floor of City Hall, 380 A Avenue, alongside Planning, under Building Official Brian Don. Lake Oswego had about 39,700 residents in the Census estimate for 2025; most live in Clackamas County, about 2,500 live in the part of the city that lies in Multnomah County, and a handful in Washington County, but one city office permits all of it.

Land outside city limits is not under the City’s building department; the City’s records page links a map for checking city limits and sends unincorporated addresses to Clackamas County.

What requires a building permit in Lake Oswego?

The department requires permits for new construction, alterations and additions, including structural, mechanical, plumbing, electrical and fire alarm or sprinkler work, apart from the state code exemptions. Chapter 45 of the city code adds a city permit for several structures the state codes leave out.

What the city decides and what the state holds

The City uses the same code editions as every Oregon jurisdiction. It controls the fee resolution, counter hours, planning sign-off, tree and erosion rules, the residential demolition definition and tax, the flood elevation standard and the extra structures listed in chapter 45.

Oregon’s building code and its exemptions are the same in Lake Oswego as everywhere in the state, and an exemption from the building permit is not an exemption from zoning, land use or a trade permit. Site snow, wind and seismic values come from the state’s Oregon Design Criteria Hub. How Oregon’s statewide code works

Lake Oswego building department: who handles permitting

Permit technicians, plans examiners and structural and trade inspectors all work in the Building Department. Planning signs off site plans and tree applications, Engineering handles erosion control, utilities and floodplain questions, and the Fire Department reviews water supply and emergency access ($250 for a commercial application, $140 for other applications that need fire review).

Permit types

Residential permits

The City publishes separate packets for a new single-family residence, residential alteration or repair, accessory structures and residential demolition, plus stand-alone building, mechanical, electrical and low-voltage, interior plumbing and exterior plumbing applications. Each residential packet must be filled in completely, with the valuation, every square footage and the bedroom and bathroom count; trade applications need the contractor named (or “TBD”), and mechanical applications need quantities. The site plan has to show property lines, lot dimensions, existing and proposed improvements with their distances to the lines, and the location and size of every tree on the property.

New houses that need no land use decision go through an Application Completeness Review pilot, with one checklist for Planning, Building, Engineering and Fire. Every new building must also show its radon mitigation details, because Clackamas County is one of the counties where the state made radon measures mandatory in 2011.

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

Commercial permits

Commercial work has its own packets: new commercial buildings, fire sprinkler and alarm systems, commercial electrical, mechanical and plumbing, commercial roofing and commercial demolition. Commercial jobs pay a fire and life safety review of 40% of the structural permit fee on top of plan review, and the City may approve phased plan review or deferred submittals for an extra fee.

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

What comes before the building permit

Planning must sign off the site plan before a residential application goes to the Building Department, and tree removal or tree protection applications have to be filed with Planning at the same time; if they are missing, the building application can be held. Planning charges no fee for its review of an accessory building, an exterior remodel of a house or duplex, or an accessory dwelling unit, while a Type II tree removal permit costs $230 for the first tree and $26 for each additional tree. Engineering takes an erosion control application, with a separate mitigation plan, for new houses and alterations that disturb soil ($350 for a single-family lot).

The City’s records page sends septic system questions to Clackamas County. Along Oswego Lake, Lake Corp scheduled its 2026 draw-down to begin on October 1; the City asked for dock, boathouse and utility applications by August 15, 2026, needs applications filed with both the City and Lake Corp, and expects the lake to start refilling on January 1, 2027.

Lake Oswego permit costs and fees

Building fees are set in the 2026 Master Fees and Charges, adopted by City Council Resolution 25-10 on December 2, 2025 and effective January 1, 2026. The building permit fee comes from the project valuation, figured with the state tables in OAR 918-050-0100 and 0110, run through the City’s sliding scale. The booklet states that the 12% surcharge required by the state Building Codes Division is applied to all permit fees.

Worked example. A remodel valued at $80,000 falls in the $50,001 to $100,000 band: $487.77 for the first $50,000 plus 30 × $4.70 ($141.00) for the next $30,000 gives a building permit fee of $628.77. Plan review at 65% is $408.70, the 12% state surcharge on the $628.77 permit fee is $75.45, and the archiving fee adds $31. Electrical, plumbing and mechanical permits are priced separately from their own schedules.

New houses also pay system development charges, school and Metro construction excise taxes, collected when the permit is issued. The City’s own comparison for a 2,000 sq ft house puts these charges at $53,059, led by the street ($18,618) and park ($17,149) charges.

Trade permits and who may pull them

Electrical, plumbing and mechanical permits are issued by the same department and filed through ePermitting or on the City’s trade applications. A job limited to trade work needs no construction plans, only a full description of the work, and a site plan when an air conditioner, heat pump or generator is going outside. Electrical plan review is 25% of the electrical permit fee; residential mechanical plan review is 25% of the mechanical fee, with a $102.82 minimum mechanical permit; plumbing plan review adds 30% where it is required.

How to apply for a Lake Oswego building permit

Review, corrections and what causes delay

In July 2026 the department estimated two to three weeks for a first review of residential structure permits and four to six weeks for commercial structural and commercial mechanical permits, counting revisions and deferred submittals; simple items such as sign permits move faster. A plans examiner emails a list of corrections to the contact person, and every project keeps one plan review number as its permanent record, so quote it on every call. A permit application expires 180 days after the application date. The City warns that a building application can be held up when the tree applications are missing, and its packets require a fully completed form, the planning sign-off and the erosion control application in the same submittal.

Inspections in Lake Oswego

Book inspections in ePermitting or on the inspection line, 1-888-299-2821, using the 16-digit IVR number and the four-digit inspection code printed on the permit. Inspectors work between 9 a.m. and 3:30 p.m.; a request in by 7 a.m. is aimed at a same-day visit, and anything later goes to the next business day. The July 2026 estimate was an inspection within two business days of scheduling. The work must be ready on the day requested.

A failed inspection gets a correction notice, and the work must be fixed before the next request; repeated failures or inaccessible work can bring a re-inspection fee of $105.49. The permit stays valid for 180 days from issue or from the last approved inspection, and the Building Official can grant a 180-day extension on a written request. Once the final building inspection is approved, the permit is final and occupancy is allowed; inspection reports and the certificate of occupancy arrive by email through ePermitting. In residential zones, excavation, demolition and building work is allowed from 7 a.m. to 6 p.m. on weekdays and 8 a.m. to 6 p.m. on Saturdays unless the City Manager grants a special permit.

Lake Oswego permit search and official resources

Permits the City has issued can be searched without an account on Oregon’s ePermitting site (BuildingPermits.Oregon.gov); set the start date to 1900 to see older permits. The City holds no house plans from before 1985. Records not online go through the City’s public records request form; staff acknowledge a request within five business days and ask for a deposit if the cost will exceed $25.

Flood rules are in the Flood Management Area section of the Community Development Code (LOC 50.05.011), which says the rules exist in part to keep the city eligible for flood insurance. New and substantially improved houses there must put the lowest floor at or above the Lake Oswego design flood elevation: one foot above the base flood elevation or the area flooded in February 1996, whichever is higher. The city is in FEMA’s National Flood Insurance Program (participating in the Community Status Book), and its flood insurance rate map in effect dates from June 17, 2008.

• Lake Oswego Building Department
• Building Department contact information and hours
• Lake Oswego e-permitting instructions
• Oregon ePermitting: apply, search permits and book inspections
• Lake Oswego permit applications and packets
• Building inspection process
• Master Fees and Charges (2026 booklet, Resolution 25-10)
• Residential demolition requirements
• 2026 Oswego Lake draw-down permit notice
• Public records and past building permits
• Lake Oswego Code (chapters 24, 45 and 50)
• Oregon Building Codes Division: adopted codes
• Oregon Construction Contractors Board

Lake Oswego building permit FAQ

Who issues building permits in Lake Oswego?

The City of Lake Oswego Building Department at City Hall, 380 A Avenue, 2nd floor, for every address inside city limits, in all three counties the city reaches. Call 503-635-0390.

How much does a building permit cost in Lake Oswego?

Under the 2026 fee schedule a job valued up to $2,000 pays $102.82, and the fee rises on a sliding scale; an $80,000 remodel pays $628.77, plus 65% plan review, the 12% state surcharge on the permit fee and a $31 archiving fee.

Do I need a permit for a fence or retaining wall?

A fence needs a city building permit only when it is over 7 feet high. A retaining wall needs one when it is over 4 feet from the bottom of the footing to the top, or shorter but holding back a surcharge. Zoning setbacks still apply either way.

How long does plan review take?

The City’s July 2026 estimate was two to three weeks for a first review of a residential structure permit and four to six weeks for commercial structural and mechanical permits.

What does it cost to tear down a house?

A residential demolition permit is $300, and the owner also pays a $15,000 demolition tax when the permit is issued, unless a certified deconstruction contractor takes the house down. Houses built in 1940 or earlier must be deconstructed by hand.

How do I get a same-day inspection?

Book in ePermitting or on 1-888-299-2821 with the IVR number and inspection code printed on the permit. Inspectors work 9 a.m. to 3:30 p.m., and a request made by 7 a.m. is aimed at a same-day visit; later requests go to the next business day.

Simplify Lake Oswego permitting with Alliance Permitting

Alliance Permitting is a permit documentation and submission company in Oregon. 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 Lake Oswego permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.