Library

A collection of writings from our office.

Process & Frequently Asked Questions

Welcome to the Workshop 315 library of articles to help you understand topics related to design and how we approach it. Below are articles relating to our process and frequently asked questions.

Process

It’s important to understand the design process. Any project with a design professional will typically include the these phases or something similar. We like to break the phases into two larger categories of the schematic design and post schematic design Phases. The schematic design phases are coming up with a larger design and dialing in the early budget and the post schematic design phases are taking the design and adding the technical information to the drawing and assisting with construction. See a breakdown below.

Feasibility / Existing Documentation
The start of every project consists of gathering important information regarding existing conditions and code review. The goal is to understand the parameters of the design and check to make sure the desired scope is feasible. We will review local building and zoning code and document existing conditions by building a digital model of your home. We end this exercise with the pre-design meeting to discuss what we have found. Sometimes a feasibility study is helpful before engaging with the remaining design process. We are happy to provide a stand-alone feasibility study (see Feasibility Studies).

Feasibility graphic showing maximum building height for this home

Schematic Design
Once we have the parameters of the design determined and have verified the desired scope through the pre-design process, we will start working on the early design concepts. We will present designs and continue to work through iterations based on your feedback until we have arrived at the ideal scheme. The end of the phase includes a schematic pricing package of early drawings and notes for a contractor to put an early budget together.

Schematic floor plan showing a design option

Pricing
To understand costs, it’s ideal to work with a contractor early. We can work with a contractor you’ve selected or help find a contractor. We will send the schematic pricing package to the selected contractor who will put together a construction budget. We will end this phase by refining the scope to meet the budget.

Pricing Plan for a Contractor to Price

Design Development
With the scope defined, we will start by teaming up with consultants to develop the drawings for a building permit application. The process includes adding additional detail to the drawings, performing calculations, and preparing forms. This phase largely concludes once we have submitted the permit application, but some additional time will be required to address corrections issued by the building department.

Building area diagram required for a building permit application

Construction Documents
This phase consists of adding additional information, outside of what the building department requires, to produce a drawing set for construction. This phase will consist of a kick-off meeting with the entire team to understand what information should be included in the set. The contractor will largely let us know if additional details are required and we will work with you to determine the finishes, fixtures, and equipment.

Interior elevation of a bathroom wall

Construction Consultation
Once the permit application is approved and the construction documents are completed, we will send the drawings to the contractor for one more review and final estimate. Once construction starts, we will work as a team to answer questions and review the work for compliance with the construction documents. We will help address items missed in the field, add additional details and clarifications to our drawings, and find solutions to unforeseen issues.

Site visit during construction consultation to answer questions and review work

Frequently Asked Question

Part of our philosophy is transparency and below are realistic answers to frequently asked question.

Schedule
Design and construction will take anywhere from 1-3 years from start to finish. We have found design typically takes 8-12 months and construction takes 8-12 months for most residential projects. There are a lot of check points in the timeline and many of them require a choice that will have a lasting impact and require a bit of time. The biggest factors out of our control are the time it takes a client to make decisions and the permit review time required to obtain a permit. We are in this together and will try to be as efficient as we can to get a project completed.

Construction Costs
It’s hard to know what exactly something will cost, particularly early in the design process. We have to factor the type of work taking place. Bathroom and kitchens will have significantly higher costs when compared to a bedroom. We also have to consider particular systems and components like stairs or equipment that could impact the budget considerably.

We will navigate construction budgets by providing assumptions during the schematic design phases. The budget assumption will include a range and reflect the scope of work shown based on information we are seeing industry-wide and our own experiences. Once we have a contractor on board, they will help us understand the costs more accurately. The entire design process will include budget check-ins with more and more clarity so we can tune the scope of work to meet your budget.

Design Fee
In addition to the construction cost, one should factor design and permitting fees into their budget.

All fees tend to track relative to construction costs. For example, a larger project will take more money to build, requiring more time for architects and engineers to document and the jurisdiction to review the project. Each project will break down differently based on many factors, but we find our design fees will track within 8-12% for a typical project.

The biggest factors impacting the fee are scope of work, interactions of design, design changes, and legal requirements. For example, if a project is relatively small, say simply a bathroom, kitchen, or deck project, our fees could track higher than 12% since there is a standard amount of work any project requires particularly with design development / permitting. The general rule is that cost savings apply as projects scale up, so a large remodel such as a whole house remodel will equate to the lower end of our estimates.

Other factors like permitting will fall within 2-4% of construction cost. Engineering will vary significantly based on the type of engineer (Geotechnical, Civil, Structural) and scope of work, but for budgeting would be good to assume 1-4% each.

Billing & Invoicing
We bill our time hourly in 15-minute intervals and will provide fee estimate prior to any work taking place. The fee estimate for schematic design phases will be included in our proposal, and post schematic phases will be included in a later addendum. We will monitor our fee to make sure we are not exceeding the estimate agreed to. If we anticipate we will exceed our estimate, we will address it prior to find a solution.

We will invoice monthly for services executed and ask that the invoice be paid in 15 days. Our invoices will include a summary showing fee used against the contractual estimates. We will also include a detailed summary of everyone’s time with notes of what the time was used for to be transparent about our fees.

Matthew Hagen
Seattle's New Land-Use Code 2025

What are the changes in the Interim Legislation 120969 for neighborhood residential zones (formerly known as Single Family zones)?

We know folks are probably not tracking Seattle’s current land-use code changes as much as we are, so we wanted to help you understand what’s happening.

First, we want to mention that the interim legislation, Council Bill 120969, is not technically the Comprehensive Plan that is being discussed currently. This interim legislation had to pass to meet compliance with State Bill 1110, which requires jurisdictions to increase densities on residential lots. This interim legislation is largely due to our City Council and Mayor’s office failing to meet the original timelines to pass the Comprehensive Plan in time for House Bill 1110 to take effect (June 30th, 2025).

While the interim legislation is a different piece of legislation, it’s very likely the same rules will remain in the Comprehensive Plan once the full legislation passes (which may have happened by the time you read this).

Below is a quick summary of the differences between the old land-use code and the new. This should only be treated as a guide because we are leaving some of the technicalities out. We must also acknowledge the fast-paced process of these changes, and our initial interpretations could vary. It’s always smart to engage with an architect who can help you navigate the nuances for your particular site.

Before we get started, you will see the term "lot area" used, which is simply the square footage of land of the lot. You will also see us use the term "dwelling unit," which is simply a unit that a person or family would inhabit. This could be a house, accessory dwelling unit, apartment, etcetera. We chose to omit Residential Small Lot (RSL) zones in the table for simplicity, so please know the rules are different for RSL zones. Our understanding is RSL  will be phased out after the Comprehensive Plan is passed. There is also nuance with smaller lots (less than 5000 sf) that isn’t fully presented.

Lot Coverage (SMC 23.44.010)

Lot coverage is anything that covers the grade of your lot. We like to tell clients anything that covers the ground at 36 inches or higher counts towards lot coverage. There are a few exceptions like fences and the first 36 inches of eaves, but overall, the 36-inch rule above grade plane is a great way to think of it. There is also a bonus provided for lots that are adjacent to alleys, which allows one to increase the lot area for this calculation by half the width of the alley adjacent to the property. Say you have a 16’ wide alley and your rear property line is 50’ wide; one can add 400 sf (8’ half the alley width x 50’) to this calculation.

Old Lot Coverage:

  • Lots that are equal or greater than 5000 square feet: 35% of the lot area

  • Lots that are less than 5000 square feet: 15% of lot area + 1000 square feet

New Lot Coverage:

  • 35% of the lot area or 15% of lot area + 1000 square feet for lots less than 5000 square feet for the Primary Dwelling unit and any attached accessory dwelling unit. (no change)

  • 50% of the lot area for any lot that has two or more detached dwelling units (primary dwelling unit, house, and detached accessory dwelling unit).

The code reduced the barriers to put additional detached dwelling units on a lot by increasing the lot coverage allowed and prevents property owners with one dwelling unit from getting the same benefit, leaving the lot coverage what it was prior to the bill passing.

It should also be noted that no change to the alley lot bonus, continuing to support additional area where alleys are present.

Floor Area (SMC 23.44.011)

Floor area is the area measured from the interior face of the exterior walls. We tell our clients the interior walls and stairs count, but the exterior walls do not. The maximum floor area is expressed as a ratio, which is why many people refer to this as FAR, standing for Floor Area Ratio. Like lot coverage, this ratio is applied to the lot area to provide the maximum floor area permitted on a site.

Old Floor Area: 0.5 of the lot area

  • Exemptions:

    • Areas below grade (less than 4’ between grade and ceiling)

    • Accessory Dwelling Units

    • 500 square feet of detached accessory structure (think shed or garage) or 250 square feet for an attached garage

New Floor Area:

  • 1 dwelling unit per 4000 square feet or greater: 0.6

  • 1 dwelling unit per 2,201-4000 square feet: 0.8

  • 1 dwelling unit per 2,200-1,601 square feet: 1.0

  • 1 dwelling unit per 1,600 or less: 1.2

  • Exemptions:

    • Areas below grade (less than 4’ between grade and ceiling)

    • Common walls separating individual attached dwelling units

The code increases floor area maximums based on how many units are provided on a lot. It should be noted that the exemptions for accessory dwelling units, accessory structures, and garages have been removed, but we have found the increase in max floor area makes up for that. You will see, much like lot coverage, a property owner with only one dwelling unit does not get any additional allowable floor area from current code.

Maximum Height (SMC 23.44.012)

This is simply the highest a structure can be on a lot.

Old Code: 30’ with a 5’ bonus given to gable roofs with a pitch of 4:12 or greater

New Code: 32’ with a 5’ bonus given to gable roofs with a pitch of 4:12 or greater

This increases the maximum height by 2’.

Yards (SMC 23.44.014)

Yards are the terminology that Seattle uses for residential lots, and most people understand them better as setbacks. A yard is a restriction of placing a structure within a certain distance from the property line. Seattle has front, side, and rear yards.

Old Code:

  • Front: 20 feet or the average of neighbors (which can’t be less than 15’)

  • Side: 5 feet

  • Rear: 25 feet or 20% of the lot depth

There are a lot of exceptions.

New Code:

  • Front:

    • Lots with one or two dwelling units: 15’

    • Lots with three or more dwelling units: 10’

  • Rear:

    • Lots not abutting an alley with one or two dwelling units: 15’

    • Lots not abutting an alley with three or more dwelling units: 10’

    • Lots abutting an alley: no rear yard

  • Side: 5’

  • Similar exceptions, with an additional exception for Queen Anne Boulevard as submitted by Rob Kettle to exclude that right of way from these requirements.

This reduces setbacks overall in the front and rear depending on the situation you find on a particular lot.

Conclusion

Overall, we are excited to start seeing the impacts these changes will have on our city and hope the outcome is more affordable housing to meet our needs. If you have any questions about these changes, please feel free to contact us.

Matthew Hagen