Best Interior Designers in Mercer Island, WA (2026)
Choosing the right interior designer in Mercer Island, WA can be overwhelming. With 5 interior designers operating across the Mercer Island metro area, how do you separate the truly exceptional from the merely adequate? At The Interior Design Guide, we analyze publicly available data to rank every interior designer on a transparent, editorial basis -- no paid placements, no sponsored rankings.
This 2026 ranking evaluates interior designers in Mercer Island, Washington using our proprietary Guide Score algorithm, which weighs verified reviews, professional credentials, press recognition, web presence, years of experience, and profile completeness. We reviewed 5 active businesses in the Mercer Island market and selected the top 5 for this list.
By the numbers: Guide Scores on this list range from 7 to 33 out of 100, the average firm has 22 years of experience. Updated April 2026.
Each entry below includes the business's Guide Score, star rating, review count, and a data-driven explanation of why they earned their spot. Click through to any profile for the full breakdown including contact information, specialties, credentials, and related businesses in Mercer Island.
The Top 5 Interior Designers in Mercer Island, WA
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#1 Six Walls 33/100
Selected for 22 years of experience (est. 2004).
Six Walls is an trusted interior designer proudly serving Mercer Island, WA and the surrounding region. Led by Seattle Denver, six Walls was founded in 2004 on the principle of approachability and ha…
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#2 Michelle Yorke Interior Design LLC 21/100
Selected for team of 5 professionals.
Michelle Yorke Interior Design LLC has built a reputation for quality interior design work in the Mercer Island, WA area. They serve clients in the luxury market segment. Reach them at (206) 349-1239…
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#3 ID by Gwen 17/100
Ranked 3rd among interior designers in this market based on overall Guide Score.
ID by Gwen is an trusted interior designer proudly serving Mercer Island, WA and the surrounding region. Located at 7500 86th Ave SE. Reach them at (206) 313-0720. Visit their website for more detail…
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#4 Diamond Design 15/100
Ranked 4th among interior designers in this market based on overall Guide Score.
Diamond Design is an trusted interior designer proudly serving Mercer Island, WA and the surrounding region. Located at 9031 E Shorewood Dr 21-619. Reach them at (206) 660-9589. The Mercer Island int…
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#5 Colleen Knowles Interior Design 7/100
Ranked 5th among interior designers in this market based on overall Guide Score.
Colleen Knowles Interior Design brings professional interior design expertise to the Mercer Island, WA community. Located at 9311 SE 36th Street, Suite 103. Reach them at (206) 399-2232. The Mercer I…
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How We Ranked These Interior Designers
Our Guide Score (0–100) combines verified Google reviews and ratings (30%), professional credentials (10%), press and media recognition (5%), web and portfolio presence (15%), years of experience (15%), profile completeness (10%), and industry awards (up to 5 bonus points). No business can pay for a higher ranking.
Data sources include Google Business Profile, professional registries, portfolio sites, press databases, and direct business submissions. Every piece of data is publicly verifiable.
Frequently Asked Questions
How did we rank the best interior designers in Mercer Island?
The Interior Design Guide ranks interior designers using our Guide Score (0-100), a composite metric computed from publicly available data. The score weighs Google reviews and ratings (30%), professional credentials and certifications (10%), press and media recognition (5%), web and portfolio presence (15%), years of experience (15%), profile completeness (10%), and awards (up to 5 bonus points). There is no paid placement -- every ranking is purely editorial.
Who is the #1 interior designer in Mercer Island, WA?
As of 2026, Six Walls holds the #1 ranking in Mercer Island with a Guide Score of 33/100. Rankings are recalculated with every data update and reflect the latest available information.
How often is this list updated?
Core data (ratings, reviews, contact information) is re-verified on a rolling monthly cadence. Credentials and awards are audited quarterly. Guide Scores recalculate automatically with every data update, so rankings may shift as new reviews are posted or credentials are verified.
How many interior designers are there in Mercer Island?
Our database currently tracks 5 active interior designers in the Mercer Island, WA metro area. This list highlights the top 5 based on Guide Score. Browse our full Mercer Island directory to see every listed business.
Can a interior designer pay to be ranked higher?
No. The Interior Design Guide does not accept payment for rankings. Guide Scores are computed algorithmically from verified public data. Businesses can claim and update their profile with accurate information, but the ranking algorithm treats all profiles equally. Our editorial independence is core to our methodology.
What should I look for when hiring a interior designer in Mercer Island?
We recommend evaluating: (1) professional certifications and credentials, (2) verified customer reviews and ratings, (3) years of experience in the Mercer Island market, (4) portfolio quality and range of work, (5) budget alignment with your project scope, and (6) responsiveness and communication style. Our Guide Score weighs these factors so you can compare at a glance.