Do I need a permit for a small shed or storage building?

Sheds under 120-200 sq ft (depending on zoning and setbacks) are often exempt in Gresham, but not always. Lot size, flood zone, and distance from property lines all matter. If your lot is in a flood zone or you're within 10 feet of a property line, a permit is required. Call the Building Department or check the online portal to upload your site plan and get a quick answer — it usually takes a day or two.

What's the frost depth I need to use for my deck or fence posts?

West of 181st Ave in Gresham (Willamette Valley zone 4C), the frost depth is 12 inches. East of 181st Ave (zone 5B foothills), it's 30 inches or deeper. Check your address on a city zoning map or call the Building Department to confirm which applies to you. When you submit your permit, show post footings extending below the frost line. If you're uncertain, a soil test or a quick conversation with the inspector can save you from frost heave later.

Can I do the electrical work on my own house?

Oregon allows owner-builders to permit and construct on owner-occupied property, but electrical work has limits. You can replace outlets, switches, and light fixtures on existing circuits without a license. Any new circuit, panel work, EV charger, or kitchen/bathroom outlet needs a licensed electrician. You can do the demolition, framing, and finish work yourself — the electrician pulls the permit and does the rough and final inspections. This protects you and keeps insurance valid.

How long does it take to get a Gresham building permit?

Simple permits (fences, shed roofing, electrical outlet replacements) can be approved over-the-counter same-day or within a few days. Routine residential permits (decks, new sheds, basement finish) take 1-2 weeks for plan review if your plans are complete. Anything with structural, foundation, or mechanical complexity takes 3-4 weeks. Flood zone, wetland, or floodplain work adds another 2-4 weeks because Planning and Engineering review it too. Submit a complete, clear application and you'll avoid delays.

What happens if I start work without a permit?

Gresham, like all Oregon jurisdictions, can issue a stop-work order, require you to remove unpermitted work, and fine you. Unpermitted work also voids insurance coverage on that work. If the city finds out later (from a neighbor complaint, a sale, or a follow-up inspection), you may have to tear it down. Getting a permit upfront is faster and cheaper than fixing it afterward. If you've already started, call the Building Department and ask about applying for a retroactive permit — many jurisdictions allow this, though you'll pay penalties and inspection fees.

Does Gresham require radon mitigation in new construction?

Yes. The 2020 Oregon Building Code requires sub-slab depressurization or passive radon mitigation in all new residential construction, including basements, crawlspaces, and slabs-on-grade. The system must be installed at rough-in; it can be activated immediately or anytime later. If you're building a basement or finishing a crawlspace, this is on the inspector's checklist. Install it during framing, and you'll pass inspection more easily.

How much do Gresham building permits cost?

Most residential permits are priced at 1.5-2% of project valuation, plus inspection fees. A $10,000 deck costs roughly $150-$250 for the permit, plus $75-$150 per inspection (usually 2-3). Electrical and plumbing subpermits are often flat fees ($50-$150 depending on scope). Fence permits are often flat fees ($75-$100). Call the Building Department or check the online portal for a fee schedule — costs can change, and some small projects have reduced or flat fees.

What if my house is in a flood zone — does that change the permit?

Yes. If your property is in a Federal Emergency Management Agency (FEMA) flood zone, any new construction, substantial renovation, or addition must comply with floodplain rules. You'll need an elevation certificate showing how high your foundation sits relative to the base flood elevation. The Building Department may require you to elevate your structure, use flood-resistant materials, or install vents. Check your address on the FEMA Flood Map Service Center online, or ask the Building Department — they can pull your flood zone status and tell you what's required before you design.

Building Permits in Gresham, OR (2026)

Do I need a permit in Gresham, Oregon?

Gresham straddles two climate zones and two different frost depths, which shapes how the city enforces building code. The western side (Willamette Valley) sits in zone 4C with a 12-inch frost requirement; the eastern side climbs into zone 5B with frost depths pushing 30 inches or more. Both areas have volcanic and alluvial soils that can shift, meaning foundation and deck work get extra scrutiny. The City of Gresham Building Department administers permits under the 2020 Oregon Building Code, which tracks the 2020 IBC with Oregon amendments. Oregon law allows owner-builders to permit and construct on owner-occupied residential property, which opens up DIY routes for homeowners — but you still need a permit before you break ground. The city processes most routine residential permits (fences, decks, sheds, electrical upgrades) in 1-2 weeks if plans are clean. Anything requiring structural, foundation, or mechanical work takes longer — plan 3-4 weeks for plan review. Fees run 1.5-2% of project valuation for most work, plus inspection fees. The city offers an online permit portal; starting there saves phone calls and walk-ins.

What's specific to Gresham permits

Gresham's two-zone split matters most for decks, sheds, and foundation work. West of 181st Avenue (roughly), you're in zone 4C and can often use 12-inch frost footings for smaller residential structures — but the Willamette Valley's clay soils mean deck piers still need proper drainage and backfill, or they heave. East of 181st, frost depth jumps to 30 inches or deeper, and expansive clay is common. The building department will flag this on the plan-check comments: show footing depth relative to your property's known frost line. A soil test report ($300–$600 from a local geotechnical firm) is money well spent if you're putting in a foundation or substantial deck and you're unsure of soil type.

Oregon's owner-builder exemption is generous but has boundaries. You can pull a residential permit for work on property you own and occupy, and you can do the labor yourself — no contractor license required. But you still need the permit, inspections, and code compliance. Electrical work is the exception: Oregon requires a licensed electrician for any work beyond the homeowner's own branch circuit repairs. Plumbing and HVAC also have endorsement requirements. If you're planning a full kitchen remodel or a new furnace, plan to hire the licensed trades even if you're doing demolition and finish work yourself.

Gresham adopted the 2020 Oregon Building Code, which includes the 2020 IBC plus state-specific amendments. The code addresses seismic requirements (moderate seismic risk in the Portland metro), radon mitigation (sub-slab depressurization is expected in new construction), and specific ventilation rules for the Willamette Valley's moisture climate. When you pull a permit, expect questions on radon mitigation, basement or crawlspace ventilation, and slope/grading if your site drains toward the foundation. Have a grading or drainage plan ready for anything below-grade.

The building department's online portal lets you submit applications, pay fees, and track plan review status without visiting in person. You can also upload updated plans if the reviewer has comments. Over-the-counter permits (simple fences, some sheds, shed upgrades under $500) can sometimes be approved same-day if you bring a completed application and clear site plans. Call ahead to confirm which permit type qualifies for over-the-counter service.

The #1 reason Gresham permits get bounced back is missing or unclear site plans. Show property lines, setbacks, existing structures, and the footprint of what you're building. If your lot is in a flood zone (check FEMA FIRM maps), you'll need elevation data and a floodplain development permit before building. Wetlands on or near your property also trigger additional permits through the City's Planning Division. These add 2-4 weeks to the timeline, so confirm your site's constraints early.

Most common Gresham permit projects

These five projects account for most residential permits in Gresham. Each has local quirks — frost depth, setback rules, electrical requirements — that affect timelines and cost. Click through to the project page for Gresham-specific guidance.

Decks

Decks over 30 inches tall or larger than 200 sq ft require a permit. Frost depth varies: 12 inches west of 181st Ave, 30+ inches east. Stairs, railings, and joist spacing all carry code requirements. Most Gresham decks take 2-3 weeks to permit.

Fences

Most residential fences under 6 feet don't require permits unless they're in a corner-lot sight triangle. Pool fences and privacy fences over 6 feet do. A simple site plan showing setbacks is usually all that's needed.

Electrical work

Any new circuit, panel upgrade, EV charger, or outlet addition in a bathroom or kitchen needs a permit. Oregon requires a licensed electrician for most work. Homeowner rewires on owner-occupied property are allowed under Oregon law but still require inspection.

Kitchen remodel

Permit required if you're moving walls, changing plumbing, electrical, or ventilation. Licensed plumber and electrician must sign off. Most kitchen permits take 3-4 weeks due to plan complexity.

Do I need a building permit in Gresham, OR?