dadu permit times and pre-approved plans

Thank you to everyone who joined us at the Seattle Adu Fair last Saturday. It was great to meet so many of you in person.

We've fielded a lot of questions about Seattle Department of Construction and Inspections (SDCI)'s permitting times and how pre-approved plans for DADUs may affect them. To answer these questions, we have been crunching the numbers. The good news - there's been significant improvement since DADUs were given a high priority this fall, reducing the amount of review and processing time to get a construction permit by 50% from this time last year.

What about pre-approved plans?

The Office of Planning and Community Development (OPCD)'s Pre-Approved Plans for Accessory Dwelling Units fact sheet states that pre-approved plans can receive a building permit in 2-6 weeks (pre-approved or standard plans have already been reviewed for ordinance, structural (O/S) and energy). The city's hope is that by having these reviews completed beforehand, permit review times will go down - which seems logical but unfortunately doesn't align with our experience which indicates the O/S and Energy reviews are not driving overall permit approval times.

To analyze this, we reviewed permit histories from similar DADUs both recently permitted (indicated in gray) and those from this time last year (indicated in yellow) to see what was driving permit timelines. In the nine projects we examined, the O/S and Energy reviews only increased permitting time twice. And in those instances the delay was minor averaging only 3 days.

Removing the delays caused by O/S and energy reviews, the average review and processing time for a DADU permit is 46 days (excluding time from submittal to intake). The review and and processing time including O/S and energy reviews is 49 days. Unfortunately, means that pre-approved plans do not significantly affect the time-frame. A realistic time-frame for pre approved plans being 7-10 weeks, significantly longer than the 2-6 weeks stated by OPCD.

There is good work being done to tighten permit timelines

The OPCD's Pre-Approved Plans for Accessory Dwelling Units fact sheet states that the typical DADU permit takes 4-8 months. This includes the 4 months required to secure a permit intake date. To improve this, SDCI recently announced the intake express which promises all intakes will take place within 2-3 weeks. Using the intake express time-frame, and the data on permit processing time shows us that there is no significant difference in review and processing time for pre-approved or custom designs. A realistic time-frame for review and processing of custom designs being 7-10 weeks - significantly less than the stated 4-8 months.

SDCI DADU REVIEW TIME.jpg

Understanding Seattle's Proposed Land-Use Code Changes

City council has proposed significant changes to the Seattle Land-Use Code with the aim of increasing the construction of backyard cottages (DADUs) and attached accessory dwelling units (ADUs). These changes, in the making for years now, have been delayed by a lawsuit and appeal brought about under SEPA regulations. Seattle City Council held a public hearing to discuss the proposed code changes Tuesday, June 11th at 5:30pm in council chambers. Discussion and possible vote on amendments and the proposed legislation will be held on June 28th at 2:00pm.

What do these changes really mean for Seattle and for ADUs?

The proposed code changes include many items that are minor and could have been completed years ago. These include modest increases in size and height of allowed cottages, details about dormers, and the location of entries. The more significant changes proposed are as follows:

  • Allowing two ADUs on one lot

  • Removing the off-street parking requirement

  • Removing the owner-occupancy requirement

  • Increasing the household size limit for a lot with two ADUs

  • Establishing a new limit on the maximum size of single-family dwellings equal to one half of the lot size (FAR = 0.5)

This DADU was built for a grandparent in the Bryant neighborhood

This DADU was built for a grandparent in the Bryant neighborhood

Owner Occupancy

Of these we believe the owner-occupancy requirement is most important. Currently the owner is required to live on the property for a minimum of six months of the year.

The impact to removing the occupancy requirement is unknown. The environmental impact statement (EIS) prepared as part of the lawsuit doesn't appear to adequately predict the impact from removing this requirement. Detractors believe that it will lead to the destruction of large numbers of existing homes and their replacement with duplexes and triplexes. They also note an increasing trend to sell ADUs and their primary residence separately using a condominium or land-lease agreement.

Our Recommendations:

  • The original proposal to sunset owner occupancy after a period of time (3 years) is good and should minimize the destruction of naturally occurring affordable housing by speculative developers.

  • Owner occupancy should be required for all properties used as short-term rentals.  

  • SDCI should closely monitor ADU construction and report annually to City Council.

The builder plans to maintain ownership of this DADU and sell the primary residence using a condominium agreement

The builder plans to maintain ownership of this DADU and sell the primary residence using a condominium agreement

Floor Area Ratio Limits

The EIS finds that the most significant way to reduce tear-downs (i.e the removal of naturally occurring affordable housing) will occur by introducing a floor area ratio (FAR) limit. Currently the size of new houses is limited by setbacks and height limits. The trend in new construction is for very large houses (with correspondingly large price tags), which are typically beyond the means of median income earners. The FAR limit would reduce the size of what can be built but exclude ADUs and DADUs from the restriction. The goal being to prevent tear-downs and to encourage rather the construction of ADUs and DADUs.

Our Recommendations:

  • Approve a FAR limit of 0.5 for new construction.

  • Exemption of ADUs and DADUs from the FAR limit.

The City Council held a public hearing to discuss these proposed changes on Tuesday, June 11th at 5:30pm in council chambers. Discussion and potential vote on the amendments and proposed legislation will be held on June 28th at 2:00pm.

We encourage you to voice your opinion with your council members and look forward to moving ahead with sensible legislation.