What happens if you skip the permit (and you needed one)
- Stop-work orders fine $500–$1,500 per violation in Deschutes County; requires you to pull the permit retroactively and pay double or triple fees.
- Insurance denial: your homeowner's policy will not cover an unpermitted ADU; a fire or injury claim will be rejected, leaving you personally liable for $50,000–$300,000+ in damages.
- Resale disclosure: Oregon law requires seller disclosure of unpermitted structures; failure to disclose triggers fraud liability and forces removal or a $10,000–$30,000 price reduction.
- Lender/refinance block: any mortgage or equity-line refinance will be denied until the ADU is brought into compliance or removed; financing costs balloon $5,000–$15,000 in back fees and re-inspection.
Redmond ADU permits — the key details
Oregon state law (ORS 197.312) is the primary driver for ADU permitting in Redmond. The law requires cities to allow at least one ADU per single-family residential lot and prohibits cities from imposing minimum lot sizes, owner-occupancy waivers (unless you are converting an existing structure), or parking requirements for ADUs. Redmond's local ordinance (Redmond Municipal Code Chapter 17 or equivalent) does not add significantly more restrictive rules; it incorporates the state defaults. However, the city does require that you file a Type A Land Use Compatibility Statement (or equivalent) alongside your building permit if the ADU is a new detached structure—this is a planning review, not a building review, and adds 2–3 weeks to the process. The building permit itself triggers a mandatory 60-day plan review (per state shot-clock rules for ADU land-use decisions) unless the local planning staff approves a waiver for routine conversions. Detached ADUs must meet IRC R310.1 egress requirements (operable window or second exit), R401–R408 foundation rules (critical in zone 5B with 30-inch frost), and either separate utility connections or a sub-meter agreement with the primary residence.
Redmond's frost depth of 30 inches (vs. 12 inches in the Willamette Valley) directly affects your foundation cost and compliance timeline. Footings must extend 30 inches below finished grade in most cases, or you must demonstrate site-specific soil bearing capacity (typical cost: $800–$1,500 for a geotechnical report if your engineer wants to go shallow). This adds 1–2 weeks to the design phase and typically increases foundation costs by $2,000–$5,000 versus a shallow-frost site. Deschutes County's volcanic and alluvial soils are generally well-draining, but expansive clay is present on some lots; if your ADU is on a clay-heavy site, you may need to specify post-tension slab or engineered fill (add another $3,000–$7,000 and 2 weeks for engineer sign-off). The city requires a Soils Report (Form 1) for any new detached ADU foundation; this is not optional and must be submitted with your building permit application. Plan to hire a licensed civil engineer or geotechnical firm ($1,200–$2,000 for the report alone).
Separate utility connections are mandatory unless the ADU shares water/sewer and electrical with the primary residence via a sub-meter and documented easement. Redmond's Public Works Department reviews all ADU utility plans; they will require a letter from the water/sewer provider confirming capacity on your lot. If your lot is served by the City of Redmond municipal system, this approval typically takes 2–3 weeks and is often a formality (capacity rarely denied for a single ADU). However, if you are on a septic system or private well, the approval is harder and may require a new drain field or well test (cost: $2,000–$8,000; timeline: 4–6 weeks). Electrical sub-metering is allowed and is the most common route for shared-utility ADUs; you must show the sub-meter location and wiring diagram on the electrical plan (NEC 690.12 and local amendments apply). The Redmond Building Department's checklist for ADU applications explicitly calls out 'utility plan showing separate connections or approved sub-meter agreement'—missing this is the #1 reason for application rejections and recycles.
Parking is automatically waived per state law; you do not need to request a variance or show parking spaces. However, the local planning staff may ask you to confirm that your lot layout does not create a public-right-of-way obstruction. Redmond also requires that you address stormwater runoff if your ADU footprint exceeds a threshold (typically 2,500 sq ft of impervious surface per lot); if your ADU is a small detached unit (400–600 sq ft), this is rarely triggered, but a 1,000 sq ft unit on a small lot may require a bioswale or rain garden. Include a site plan showing drainage flow and any treatment. Owner-occupancy of the primary residence is required by state law and enforced by Redmond at permit issuance; you must sign an affidavit confirming you or a family member will occupy the main house. This requirement is waived only if you are converting an existing detached accessory building (e.g., garage, barn) into an ADU—in that case, the primary residence does not need to be owner-occupied. Redmond's Building Department does not typically verify occupancy after 1 year, but the City of Redmond retains the right to enforce this rule if complaints arise.
The typical permitting timeline in Redmond is 8–12 weeks from application to permit issuance (not including construction inspections). The 60-day state shot-clock clock starts on the day the Building Department determines your application is 'complete'—meaning you have submitted all required documents (building plans, site plan, utility plan, soils report, Title 24 energy compliance for residential, proof of property ownership, and the land-use compatibility statement). A single resubmission (e.g., missing the soils report or incomplete electrical plan) restarts the clock and adds 2–4 weeks. Once the permit is issued, inspections are scheduled in the typical sequence: foundation (before pouring), framing (after wall sheathing), rough trades (mechanical, electrical, plumbing), insulation and drywall, and final. Each inspection requires 2–5 business days notice; the Building Department typically processes them within 3 days. Plan for 4–6 months total from design to occupancy for a straightforward detached ADU; garage conversions may be 6–8 weeks faster because the foundation and shell are pre-existing.
Three Redmond accessory dwelling unit (adu) scenarios
Frost depth, soil, and foundation cost in Redmond's zone 5B climate
Redmond sits in climate zone 5B (cold, 30-inch frost depth) versus the Willamette Valley's zone 4C (12-inch frost). This single fact drives a 15–20% increase in foundation cost and a mandatory soils report. Your engineer must design footings to extend 30 inches below finished grade, or submit a site-specific soil-bearing study showing adequate capacity at a shallower depth. Volcanic and alluvial soils in Deschutes County are generally stable, but expansive clay deposits are scattered across the region; if your lot sits on clay, the engineer may specify post-tension slab (adds $3,000–$5,000) or require 18 inches of engineered fill beneath the footing (adds $2,000–$3,000 and 1 week for fill-inspection).
The soils report (Form 1 or equivalent) must be submitted with your building permit application; the Redmond Building Department does not issue a permit without it. Hiring a licensed geotechnical engineer costs $1,200–$2,000 for the report alone. The engineer will recommend a footing depth, concrete strength (typically 3,000 psi minimum), rebar spacing, and any special site conditions. If the report reveals expansive clay, corrosive soil, or high groundwater, the review may extend another 1–2 weeks while the engineer and Building Department confirm the mitigation design. For a typical 600 sq ft detached ADU with a slab-on-grade or crawlspace foundation, anticipate $8,000–$15,000 in foundation costs (labor + materials + engineered design) due to the 30-inch requirement. A comparable ADU in Portland (12-inch frost) would run $5,000–$10,000.
Drainage and stormwater are also climate-sensitive. Redmond's average annual precipitation is 10–12 inches (semi-arid), but seasonal runoff can be brisk during spring snowmelt. If your ADU lot slopes toward a neighbor's property or a public right-of-way, you must show site grading and drainage swales on the site plan. If your ADU footprint (plus driveway and patios) exceeds 2,500 sq ft of impervious surface, the city may require a bioretention area or rain garden; confirm with the Public Works Department during pre-application. A small detached ADU (600 sq ft) with a gravel parking area typically avoids this trigger, but a 1,000 sq ft unit with a concrete driveway may require a 200 sq ft bioswale (add $1,000–$2,000 for design and grading).
Utility connections, sub-metering, and Public Works approval in Redmond
Redmond requires that ADUs have separate water and sewer connections or a documented sub-meter agreement. Most lots served by the City of Redmond municipal water/sewer system can accommodate a second meter (cost: $500–$1,500 material and labor from the water utility). However, if your lot is on a septic system or private well, a second system is usually not feasible; instead, you must document a sub-meter for water and a separate drain field or greywater system for sewer (adds complexity and cost: $2,000–$8,000). The Public Works Department requires a 'water and sewer availability letter' confirming that the utility can serve an ADU; this letter is obtained from the water provider (usually a 2–3 week process for City of Redmond customers, often a formality).
Electrical sub-metering is the standard route for ADUs sharing power with the primary residence. The sub-meter is fed from the main panel and shows on the electrical plan (NEC 690.12 compliance). The Building Department and local utility (City of Redmond or Pacific Power, depending on the area) must approve the sub-meter location and installation. Most utilities allow sub-metering without issue; the electrical contractor simply installs the meter base and feeds branch circuits from it. Cost for sub-meter design and installation: $800–$1,500. If the ADU is detached and the primary residence is far away (more than 150 feet), running a separate service to the ADU may be cheaper than sub-metering; discuss this with your electrician and the city during pre-application.
Gas is optional for ADUs in Redmond. Some units are all-electric (resistive heat, electric range), while others have natural gas (if available on the lot) for heating and cooking. If you use natural gas, a separate meter or sub-meter is required; the natural gas provider (usually a regional utility) must approve service and may charge a $500–$1,000 extension or meter fee. Confirm gas availability during pre-application with the city's utility coordinator; if gas is not on your street or nearby, all-electric design avoids cost and complexity.
Redmond City Hall, 411 W Antelope Ave, Redmond, OR 97756 (verify current address and location hours with city)
Phone: (541) 923-7721 (main city line; ask for Building Department or Development Services) | https://www.redmondoregon.gov (search for 'online permits' or 'building permits' on the city website; Redmond may use a third-party portal or in-person submission)
Monday–Friday, 8:00 AM–5:00 PM (verify before visiting)
Common questions
Do I need owner-occupancy approval for my ADU in Redmond?
Yes, if you are building a new detached ADU, Oregon law (ORS 197.312) requires you to occupy the primary residence on the lot as your principal residence. This is enforced at permit issuance via an owner-occupancy affidavit. However, if you are converting an existing structure (garage, barn, shed) into an ADU, the owner-occupancy requirement is waived—you can keep the primary house as an investment property. Redmond's Building Department will clarify which category applies based on your project type during the pre-application meeting.
How long does the ADU permit process take in Redmond?
The state-mandated shot-clock for ADU decisions is 60 days from the date your application is deemed complete. In practice, Redmond's plan review typically takes 6–8 weeks (40–50 days within the 60-day window) for a straightforward detached ADU, with one resubmission request adding 2–4 weeks. Garage conversions may be faster (3–6 weeks) if they qualify for administrative approval. After permit issuance, construction inspections and final approval add another 4–5 months, depending on contractor schedule. Total time from design to occupancy: 5–7 months for a detached unit, 3–4 months for a conversion.
What is the total cost to permit an ADU in Redmond?
Permitting costs range from $650 to $9,500 depending on project type and complexity. A simple garage conversion costs $650–$1,200 (permit + plan review + minimal impact fees). A detached ADU on a standard lot costs $3,200–$5,100. An above-garage unit or fire-zone ADU costs $4,000–$9,500 if sprinkler systems or defensible-space upgrades are required. These figures do not include design/engineering (soils report $1,200–$2,000, architectural plans $2,000–$5,000) or construction costs (typically $100–$150 per sq ft for the ADU building envelope and systems).
Is parking required for an ADU in Redmond?
No. Oregon state law (ORS 197.312) prohibits cities from imposing parking requirements on ADUs. Redmond does not require you to provide off-street parking spaces for your ADU, though your site plan should show that the lot layout does not obstruct a public right-of-way. If the ADU is on a public street with limited on-street parking, neighbors may complain, but the city cannot deny your permit on parking grounds.
Can I have a junior ADU (kitchenette instead of full kitchen) in Redmond?
Yes. Oregon law allows junior ADUs (also called 'efficiency units' or 'kitchenettes') with a sink, cooking surface, and refrigerator but no traditional kitchen layout. Redmond's code does not define a specific junior ADU rule, but it defers to state law. A junior ADU in a garage conversion or above-garage space typically costs less to permit ($400–$800 in plan review versus $800–$1,500 for a full kitchen) because the design is simpler. However, code compliance (egress, ventilation, electrical) is the same. Confirm the kitchenette design with the Building Department during pre-application to avoid rejection.
Do I need to show a separate entrance for the ADU?
Yes. The ADU must have a separate entrance from the primary residence (or, in the case of a junior ADU in an existing garage, a doorway that does not funnel through the primary house). This is required by building code (IRC R310.1 egress) and state ADU law. A separate entrance ensures that the ADU can function independently for safety and occupancy verification. For a detached ADU, a single entry door is sufficient. For a conversion, you may need to add or modify a doorway, which is a minor construction task ($500–$1,500).
What if my lot is too small for a detached ADU due to setbacks?
Oregon law does not impose a minimum lot size for ADUs, so Redmond cannot deny your permit solely on lot size. However, setback rules still apply: detached ADUs must maintain standard setbacks (typically 5 feet from side/rear property lines, or 10 feet in fire zones). If your lot is very small (0.1 acres or less), a detached ADU may not fit within setbacks; in that case, a garage conversion or junior ADU is a better fit. Redmond's zoning code does not have special ADU setback reductions, so you cannot reduce the standard setback below what the code requires for accessory structures. If setbacks prevent a detached ADU, propose a conversion instead.
Does Redmond require sprinklers for an ADU?
Sprinklers are required if the total footprint of all structures on your lot (primary house, ADU, garage, sheds) exceeds 3,500 sq ft and the lot is in a designated fire zone. If your lot is outside a fire zone or the combined square footage is below 3,500 sq ft, sprinklers are not required. Check your lot's fire-zone status on the Deschutes County assessor's map or ask the Building Department during pre-application. If sprinklers are triggered, expect to budget $1,500–$3,000 for plan design, permit, and installation inspection.
Can an owner-builder construct an ADU in Redmond?
Yes, if the ADU is owner-occupied (i.e., you live in the primary residence as your principal residence). Oregon law (ORS 701.012) allows owner-builders to construct owner-occupied dwelling units. However, you must obtain an owner-builder permit, pass all inspections yourself (or hire a third-party inspector), and maintain liability insurance. The City of Redmond Building Department will issue an owner-builder ADU permit at the same cost as a contractor permit, but you are fully responsible for code compliance. If the ADU is a conversion of an existing structure (garage, barn), owner-builder rules also apply. If the primary residence is not owner-occupied, you must use a licensed contractor.
What if I want to rent out the primary residence and only keep the ADU for myself?
This violates Oregon's owner-occupancy requirement for new detached ADUs. State law requires the primary residence to be owner-occupied if you build a new ADU on a lot. However, if you convert an existing accessory structure (garage, shed) into an ADU, the owner-occupancy requirement is waived, and you can rent the primary house. Plan your project type accordingly: if the landlord scenario is your goal, propose a garage conversion, not new detached construction.