Key Takeaways
- HB 1217 exempts three categories from the rent cap: new construction (12 years from certificate of occupancy), owner-occupied buildings with 4 or fewer units, and nonprofit-owned housing
- The 12-year clock starts from the first certificate of occupancy — not the purchase date or renovation date
- Exemptions apply to the rent cap only — notice requirements, just cause eviction, and local ordinances still apply
- California’s AB 1482 uses a 15-year rolling window vs Washington’s fixed 12-year from CoO date
- When your exemption expires, the rent cap takes effect immediately — plan your last exempt increase carefully
Understanding HB 1217 Exemptions
Washington’s rent cap law, HB 1217, caps annual rent increases at 7% + CPI (maximum 10%) for most residential rental properties. But not every property is subject to the cap. The law carves out three specific exemption categories designed to protect new housing development, small-scale landlords, and nonprofit housing providers.
If your property falls into one of these categories, you are exempt from the rent cap calculation only. Other provisions of HB 1217 and Washington landlord-tenant law — including notice requirements, just cause eviction protections, and local ordinances — still apply. Understanding exactly what is and isn’t covered by your exemption is critical to staying compliant.
Exemption Category 1: New Construction (12-Year Rule)
The most significant exemption applies to newly constructed residential properties. A property is exempt from the rent cap for 12 years from the date of its first certificate of occupancy (CoO).
What “Certificate of Occupancy” Means
A certificate of occupancy is the document issued by the local building department certifying that a building meets all applicable building codes and is safe for residential use. It is issued after construction is complete and final inspections are passed. This is the document that starts your 12-year exemption clock.
Key clarifications:
- The date that matters is the CoO date, not the date construction began, the date you purchased the property, or the date the first tenant moved in.
- “First” certificate of occupancy means the original CoO for the building, not a subsequent CoO issued after renovations or additions.
- If a building has been substantially demolished and rebuilt, a new CoO may be issued, potentially restarting the clock. Consult with your local building department and an attorney to determine whether your situation qualifies.
- The exemption applies to the entire building, not individual units. You cannot have some units exempt and others not based on when they were completed.
Calculating Your Exemption Window
The calculation is straightforward: add 12 years to your first certificate of occupancy date.
| Certificate of Occupancy Date | Exemption Expires | Status in 2026 |
|---|---|---|
| January 2010 | January 2022 | Expired — subject to rent cap |
| June 2013 | June 2025 | Expired — subject to rent cap |
| March 2015 | March 2027 | Exempt until March 2027 |
| September 2018 | September 2030 | Exempt until September 2030 |
| January 2022 | January 2034 | Exempt until January 2034 |
| July 2025 | July 2037 | Exempt until July 2037 |
Why the 12-Year Exemption Exists
The new construction exemption serves an economic purpose: it avoids discouraging housing development. Developers and investors who commit capital to building new housing rely on the ability to set market-rate rents and adjust them without restriction for a reasonable period. If rent caps applied from day one, the financial models for new construction would change, potentially reducing the supply of new housing — the opposite of what rent stabilization is meant to achieve.
This is the same rationale behind California’s 15-year exemption under AB 1482 and Oregon’s 15-year exemption. Washington chose a shorter 12-year window, reflecting a balance between development incentives and tenant protection.
Comparison: Washington 12-Year vs California 15-Year
| Feature | Washington (HB 1217) | California (AB 1482) |
|---|---|---|
| Exemption period | 12 years | 15 years |
| Clock starts | First certificate of occupancy | First certificate of occupancy |
| Window type | Fixed from CoO date | Rolling (recalculated each year) |
| Applies to | Entire building | Entire building |
| Must notify tenant of exemption? | Not specified in HB 1217 | Yes (written notice required for SFH exemption) |
| Substantial renovation restarts clock? | Only if new CoO issued | No (original CoO date controls) |
California’s 15-year window gives developers three additional years of exemption, but the rolling calculation means that a property built in 2010 loses its exemption in 2025 regardless of when the owner purchased it. Washington’s fixed 12-year window from the CoO date works similarly — the exemption is tied to the building, not the owner.
Exemption Category 2: Owner-Occupied Small Buildings (4 Units or Fewer)
If you live in the building and it has four or fewer total residential units, the rent cap does not apply to the other units. This covers owner-occupied duplexes, triplexes, and fourplexes.
Requirements
- Owner occupancy: You must actually reside in one of the units as your primary residence. Owning the building without living there does not qualify.
- Unit count: The building must have no more than four total residential units, including the one you occupy.
- Continuous occupancy: If you move out, the exemption ends. You cannot claim the exemption retroactively for periods when you were not living in the building.
Practical Considerations
This exemption is particularly relevant for house-hackers and small-scale investors who live in one unit of a multi-family property. Common scenarios:
- Owner-occupied duplex: You live in one unit and rent the other. The rental unit is exempt from the rent cap.
- Owner-occupied triplex: You live in one unit and rent two. Both rental units are exempt.
- Owner-occupied fourplex: You live in one unit and rent three. All three rental units are exempt.
- Five or more units: Even if you live in one unit, the building does not qualify. The rent cap applies to all rental units.
If you move out of your unit (for example, to purchase a single-family home), the exemption ends and the rent cap applies to all units going forward. Plan your personal housing decisions with this transition in mind.
What This Exemption Does NOT Cover
Even with the owner-occupied exemption:
- You must still provide 90 days’ notice (or the local requirement) before any rent increase
- Just cause eviction protections under RCW 59.18.650 still apply
- Local ordinances in Seattle, Tacoma, Olympia, and other cities still apply — including longer notice periods and EDRA
- The first 12 months no-increase rule for new tenancies still applies
- The one increase per 12 months limitation still applies
Exemption Category 3: Nonprofit-Owned Housing
Properties owned and operated by nonprofit organizations are exempt from the HB 1217 rent cap. This primarily affects:
- Affordable housing providers operating under their own regulatory agreements
- Community development corporations (CDCs)
- Religious organizations that provide housing
- Other 501(c)(3) organizations that own and operate residential rental property
This exemption recognizes that nonprofit housing operators typically operate under regulatory frameworks (LIHTC, Section 8, HUD agreements) that already restrict rent levels. Applying HB 1217’s rent cap on top of existing regulatory restrictions would be redundant and potentially create conflicts.
If you are a nonprofit considering this exemption, verify that your organization’s structure and operations qualify. The exemption applies to the organization, not to individual properties — all properties owned and operated by the qualifying nonprofit are exempt.
What Exemptions Do NOT Cover
This is the most critical section of this guide. Even if your property is fully exempt from the rent cap, you are still subject to multiple HB 1217 provisions and broader Washington landlord-tenant law:
1. Notice Requirements Still Apply
The 90-day standardized notice requirement applies to all residential rental properties, regardless of exemption status. In Seattle (180 days), Tacoma (120-210 days), and Olympia (120-180 days), the local notice period applies. You must use the standardized notice form prescribed by the Department of Commerce.
2. Just Cause Eviction Still Applies
RCW 59.18.650’s just cause eviction framework applies to all residential tenancies in Washington. Exempt properties are not exempt from just cause protections. You still need one of the 17 enumerated causes to terminate a tenancy.
3. First 12 Months Rule Still Applies
Even for exempt properties, you cannot increase rent during the first 12 months of a new tenancy. The initial lease rate is locked for the first year.
4. One Increase Per 12 Months Still Applies
Exempt properties are still limited to one rent increase per 12-month period. You cannot increase rent more frequently even if you are exempt from the cap amount.
5. Local Ordinances Still Apply
Seattle’s EDRA, Tacoma’s relocation assistance, Olympia’s requirements — these are city-level ordinances that operate independently of HB 1217. Your state-level exemption does not override city-level requirements.
How to Document Your Exemption
If you believe your property is exempt, document it proactively. Do not wait for a tenant dispute to establish your exemption status.
For New Construction Exemption
- Obtain a copy of your certificate of occupancy from the local building department. Most jurisdictions maintain these records indefinitely.
- Note the date on the CoO. This is the date that starts your 12-year clock.
- Calculate your exemption expiration date. Add 12 years to the CoO date.
- Keep the CoO with your property records. You may need to produce it if a tenant challenges your exemption.
- Set a calendar reminder for 6-12 months before your exemption expires, so you can plan the transition to cap compliance.
For Owner-Occupied Exemption
- Document your primary residence status. Utility bills, voter registration, and driver’s license showing the property address all help establish occupancy.
- Maintain records of continuous occupancy. If you travel or are temporarily away, ensure you maintain the unit as your primary residence.
- Plan for the transition if you move out. The exemption ends when you vacate. Any rent increase notices issued after you leave must comply with the cap.
For Nonprofit Exemption
- Maintain current nonprofit status documentation. IRS determination letter, state registration, and articles of incorporation should be on file.
- Document the organization’s ownership and operation of the property. The exemption applies to properties “owned and operated by” the nonprofit.
What Happens When Your Exemption Expires
When the new construction 12-year window closes, the transition to rent cap compliance is immediate. There is no grace period. Here is what to expect:
The Day Your Exemption Expires
- Any rent increase notice served on or after the expiration date must comply with the cap (currently 9.683% for 2026)
- Rent increases already in effect before the expiration date are not retroactively limited — the cap applies to future increases only
- The rent level at the time of expiration becomes your baseline for future cap calculations
Strategic Planning for Expiration
Smart landlords plan their last exempt increase carefully:
Your exemption expires July 2027. You currently charge $2,500/month, which is below market at $3,000/month.
Option 1: Raise rent to $3,000 (20% increase) before the exemption expires. You must provide 90 days’ notice (or 180 days in Seattle). This is legal while exempt but may trigger EDRA if your property is in Seattle, Tacoma, or Olympia.
Option 2: Raise rent to $2,750 (10% increase) before the exemption, then increase by the cap amount each year after. Slower to reach market rate, but avoids EDRA in Seattle.
Option 3: Wait for tenant turnover. Vacancy decontrol allows you to set any rent for a new tenant, even after the exemption expires.
The key insight: your last exempt increase is your best opportunity to align with market rates. Once the cap applies, your ability to close a gap between current rent and market rate is limited to the annual cap amount. A $500/month gap with a ~10% annual cap takes years to close.
Common Misconceptions About Exemptions
“My property is exempt, so I can do whatever I want”
Wrong. Exemption from the rent cap does not mean exemption from all rules. Notice requirements, just cause eviction, local ordinances, and the 12-month new tenancy protection all still apply. Treat the exemption as a single-dimension carve-out, not a blanket pass.
“I renovated my building, so the 12-year clock restarted”
Not necessarily. The 12-year clock is tied to the first certificate of occupancy. Renovations that don’t require a new CoO don’t restart the clock. Only substantial rebuilds that result in a new CoO can restart it. Consult your local building department to determine whether your renovation qualifies.
“I just bought the property, so my 12 years should start now”
No. The exemption runs from the building’s first CoO, not your purchase date. If the building was constructed in 2012, the exemption expired in 2024 regardless of when you bought it.
“My fourplex is exempt because it’s small”
Only if you live in one of the units. The owner-occupied exemption requires actual owner occupancy. A fourplex you own but don’t live in is not exempt under this category. (It may still qualify under the new construction exemption if it’s within the 12-year window.)
“I don’t need to provide notice because I’m exempt”
Wrong. The 90-day (or longer local) notice requirement applies regardless of exemption status. You must use the standardized notice form for all rent increases.
“The most dangerous assumption in Washington real estate right now is that your property is exempt and therefore unregulated. Exempt properties still have to follow notice rules, just cause protections, local ordinances, and timing restrictions. The exemption only removes the cap on the dollar amount of the increase. Everything else still applies.”
— Rachid Abadli, Founder & CEO at LeaseBase
Frequently Asked Questions
How do I find my certificate of occupancy date?
Contact your local building department (city or county). Most jurisdictions maintain CoO records and can provide copies. Some municipalities have online permit databases where you can look up your property. The CoO date is also sometimes referenced in title records or property tax assessments.
Does the new construction exemption apply to ADUs (Accessory Dwelling Units)?
If the ADU received its own certificate of occupancy, the 12-year clock runs from that date. If the ADU is part of a larger building that already has a CoO, the exemption status depends on the original building’s CoO date. Consult with your local building department for your specific situation.
Can I lose my owner-occupied exemption temporarily?
If you move out for an extended period, you may lose the exemption. Short absences (vacation, travel) generally don’t affect your primary residence status. Extended absences (moving to another home for months) can. There is no bright-line rule — the question is whether the unit remains your primary residence.
What if my building was converted from commercial to residential?
If a commercial building is converted to residential use and a new residential certificate of occupancy is issued, the 12-year clock may start from that new CoO date. This depends on local building department procedures and the specifics of the conversion.
Does the exemption transfer when I sell the property?
Yes. The new construction exemption is tied to the building, not the owner. If your building has 6 years remaining on its 12-year exemption when you sell, the new owner gets the remaining 6 years. Similarly, the owner-occupied exemption requires the new owner to occupy a unit; it doesn’t transfer automatically to an absentee buyer.
Track Your Exemption Status Automatically
Managing exemption windows, expiration dates, and the transition to cap compliance adds complexity to your property operations. LeaseBase tracks your exemption status, alerts you when your window is closing, and automatically applies the correct rules to each property.