Renton Master Bathroom Remodel (Walk-In Shower)

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Renton Master Bathroom Remodel (Walk-In Shower)

Project Transformation: Before & After

Before

Dated corner tub, cramped dark-framed shower stall, basic vanity lighting, and outdated gray tile surround.

After

Beautiful walk-in shower with floor-to-ceiling tile border, custom built-in bench, shampoo niche, and upgraded matte black fixtures.

Project Overview: A Renton Master Bathroom Remodel

The homeowners of this Renton property approached Grand Building Construction with a clear vision: transform their outdated master bathroom into a luxurious, spa-like sanctuary. The original layout featured a large, unused corner tub and a cramped, dark-framed standing shower stall. This configuration left the bathroom feeling closed-off, cluttered, and highly inefficient for their daily needs. They wanted to eliminate the tub entirely and use the reclaimed space to build an expansive, modern walk-in shower with premium finishes.

Our design-build team worked closely with the homeowners to reimagine the space. By removing the corner tub, we were able to double the size of the shower enclosure, allowing for the addition of a custom built-in tiled bench, a spacious recessed shampoo niche, and a high-end dual shower head system. To complete the modern aesthetic, we upgraded the double vanity area with sleek black fixtures and illuminated LED smart mirrors. See more of our work in our before and after gallery.

Project Details

Renton Master Bathroom Remodel
Project Type	Master Bathroom Remodel
Location	Renton, WA
Project Cost	$22,500
Project Duration	7 Days
Permits Required	Yes – Plumbing Permits
Year Completed	2026

Materials & Finishes Used

Shower Wall Tile: Large-format 24″x48″ polished porcelain tiles featuring elegant Calacatta marble veining.
Accent Tile: Premium black-and-white marble-look porcelain tile border and custom niche inlay.
Shower Fixtures: Matte black dual-head rain shower system with hand-held wand and thermostatic controls.
Vanity Mirrors: Dual 30″x40″ backlit LED smart mirrors with touch-sensor dimming and defogger functions.
Cabinet Hardware: Matte black modern slim pulls on the double vanity.
Waterproofing: Full Schluter-Kerdi waterproof membrane system across the entire shower pan, walls, and custom bench.

Our Process

Step 1: Design & Layout Planning

We collaborated with the homeowners to design the new layout. Our primary focus was to ensure the new, expanded walk-in shower would fit perfectly into the space left by the corner tub while maintaining a natural flow and open feel in the bathroom.

Step 2: Demolition & Tub Removal

Our crew carefully demolished and hauled away the old corner tub, tile surround, and standing shower stall. We capped and sealed the tub’s plumbing lines, re-routed the shower drains, and prepared the subfloor and walls for the new, expanded shower enclosure.

Step 3: Framing & Advanced Waterproofing

We framed the new, enlarged shower walls and the custom shower bench. Since waterproofing is the most critical step of any bathroom remodel, we applied a multi-layer Schluter-Kerdi waterproof membrane system across the entire shower enclosure, bench, and niche to ensure a 100% watertight seal.

Step 4: Custom Tile & Fixture Installation

Our expert tile installers laid the large-format marble-veined porcelain tile floor-to-ceiling, along with the black-and-white marble floor tile and the decorative border. We then installed the matte black dual-head shower system, upgraded the vanity faucets, and hung the illuminated LED mirrors.

Step 5: Glass Enclosure & Final Walkthrough

We installed the custom frameless glass shower enclosure and completed a final walkthrough with the homeowners. The project was completed on schedule in 7 days, leaving the homeowners with a gorgeous, modern master bathroom they will enjoy for years to come.

Permitting & Code Compliance

For this Master Bathroom Remodel in Renton, WA, we pulled the necessary plumbing permits to safely cap the old corner tub lines and re-route the drains for the expanded walk-in shower. Grand Building Construction always evaluates permitting needs at the start of every project to ensure full compliance with local building codes and regulations. This gives our clients peace of mind, knowing their renovation is completed properly and to the highest standards. Learn more in our Permit Guide.

Why Choose Grand Building Construction?

At Grand Building Construction, we specialize in bathroom remodeling projects that add real value and luxury to your home. We understand the unique challenges of wet-area construction, including advanced waterproofing, proper slope-to-drain engineering, and ventilation. Our team delivers honest work at competitive prices, and we never cut corners. From the initial consultation to the final walkthrough, we are committed to exceeding your expectations.

Ready to Start Your Remodel?

Let’s build your dream space together. Call us for a free, no-obligation consultation!

(206) 492-8220

Request a Consultation

Premium Materials & Local Bathroom Design Trends in Renton, WA

In Renton and the surrounding Pacific Northwest, modern bathroom design is heavily focused on creating clean, open-concept, spa-like retreats. Homeowners are increasingly choosing large-format porcelain tiles for shower walls because they minimize grout lines, making the shower easier to clean while providing a sleek, seamless look. Backlit LED smart mirrors are also a major trend, offering both modern aesthetics and highly functional, adjustable task lighting for vanity areas.

When converting a tub to a walk-in shower, incorporating custom features like built-in benches and recessed niches adds both safety and luxury. Matte black fixtures remain a popular choice, providing a bold contrast against light-colored marble or quartz surfaces. At Grand Building Construction, we stay ahead of local design trends and use only premium materials to ensure your remodeled bathroom is beautiful, durable, and tailored to your lifestyle.

Planning a project like this one? Learn more about our bathroom remodeling services in Renton and what our team can do for your home.

Bathroom Remodeling FAQs

Do I need a permit for a bathroom remodel in Renton, WA?

Permits are typically required when a remodel involves plumbing, electrical, or layout changes. Grand Building Construction coordinates the permitting process and required inspections as part of your project, so everything is built to code.

Can I use my bathroom during a remodel?

During a full bathroom remodel, that bathroom is out of service while work is underway. If your home has a second bathroom, most homeowners stay in the home comfortably; we plan the sequence with you so you know what to expect at each stage.

What affects the cost of a bathroom remodel?

The biggest factors are the size of the bathroom, whether fixtures move or the layout changes, tile and fixture selections, and the condition of the plumbing behind the walls. A free in-home estimate is the most accurate way to price your specific project.

Do you help choose tile, fixtures, and finishes?

Yes. Material selection and planning are part of our process — we help you choose tile, vanities, fixtures, and finishes that fit your home and budget before construction begins.

Get a Free Estimate for Your Bathroom Remodel

What Our Customers Say

      EXCELLENT  
   Based on 94 reviews 
    
 
 
 
   
 
 
       Posted on Google  
   
   Lonnie Beal 
 
 
 
 Trustindex verifies that the original source of the review is Google. Had a nasty looking tub and surround.  Got an acrylic wider tub and surround installed, they did the job in about 1.5 days, got a great price on the job.  Left the area good and clean, no damage to anything.  I would use them again.
  
 
      Posted on Google  
   
   Shirley Li 
 
 
 
 Trustindex verifies that the original source of the review is Google. We hired a contractor in May to remodel our kitchen. He promised the project would be completed in three weeks. Unfortunately, after a month, less than 40% of the work had been completed. He disappeared several times without notice, and our calls and messages often went unanswered. Eventually, we decided to hire another contractor to finish the job. We are incredibly grateful that we found Grand Building Construction. Joshua and his team, Wei and Ken, completed the remaining 60% of our kitchen remodel in just five days. They ordered and installed the countertops and backsplash, corrected the mistakes left by the previous contractor, installed the flooring, completed the painting, and finished the lighting installation. Joshua, Wei, and Ken were hardworking, detail-oriented, professional, and communicative throughout the entire process. They kept us informed every step of the way, and their craftsmanship and dedication exceeded our expectations. They turned what had become a stressful and frustrating experience into a beautiful, finished kitchen that we absolutely love. We truly appreciate everything Joshua and his team did for us. Thanks to Grand Building Construction, we finally have our dream kitchen. We highly recommend them to anyone looking for a reliable, skilled, honest, and trustworthy contractor.
  
 
      Posted on Google  
   
   Matt Eary 
 
 
 
 Trustindex verifies that the original source of the review is Google. I recently had my master bathroom remodeled by Grand Building Construction, and I couldn’t be happier with the results. They helped us transform a dated, inefficient space with a bulky corner tub into a modern, spa-like walk-in shower. I came into this project with a very clear, specific vision of what I wanted, and the team was incredible to work with. They were remarkably flexible and genuinely amenable to my ideas, working closely with me to ensure every detail aligned with the final look I had in mind. Beyond their design flexibility, I was truly impressed by their technical expertise—particularly the care they took with the plumbing rerouting and the advanced waterproofing systems. They kept the project moving efficiently, finishing everything on schedule in just one week. The quality of the finished space—from the precise large-format tile work to the installation of the matte black fixtures—is outstanding. If you’re looking for a professional, collaborative team in the Renton area that listens to your vision and executes it to a high standard, I highly recommend Grand Building Construction.
  
 
      Posted on Google  
   
   Allison Owen 
 
 
 
 Trustindex verifies that the original source of the review is Google. Josh, Wei, Ken and team did a great job on my kitchen remodel. They were very communicative, had fair prices, and were detail oriented. We were able to work together to make our kitchen goals happen. I would not hesitate to hire them again for another construction project! Thank you!
  
 
      Posted on Google  
   
   Coco Merlin 
 
 
 
 Trustindex verifies that the original source of the review is Google. This review is far overdue. We worked with Emil to renovate our two bathrooms, kitchen, relevel a sunken living room floor, create a pantry, and a few other things for my house Kirkland. Emil and his team provided quality work. Grand Building I has a lot of experience and guided us new homeowners through our extensive renovation. The team was punctual and extremely professional. They always cleaned up at the end of the workday. We would work with them again in the future.
  
 
      Posted on Google  
   
   Mike Larrenaga 
 
 
 
 Trustindex verifies that the original source of the review is Google. I recently hired Grand Building Construction for a kitchen remodeling and I couldn’t be happier. The quality of the workmanship is outstanding, and the team showed great integrity by staying honest about timelines and costs. Communication was clear and frequent, so I always knew what was happening. They arrived on time every day (often working 6 or 7 days a week) and finished the project within the budget, which made the price feel very fair. I especially appreciated how they respected my home and kept the work area clean. Josh and the team were open and communicated frequently throughout, always finding a way to incorporate our design choices. I would definitely work with GBC again and am recommending them to anyone i know looking to do a renovation.
  
 
      Posted on Google  
   
   azucena solano 
 
 
 
 Trustindex verifies that the original source of the review is Google. I recently decided to remodel my master bathroom because it was seriously outdated,  since the 70s! Working with Emil so far has been a pleasure. We got creative together, figuring out solutions for things that mattered to me. His communication and attention to detail were what I really liked. From the beginning of the project, Emil made sure I was in the loop and part of every decision making process. I really appreciated that, especially since I can be quite picky about what I want. The bathroom is still in progress but so far I absolutely love the transformation! Thank you guys! I must say the work has been on time, super clean, the crew is very respectful and I appreciate their hard work. We're still in the process right now and so far this is my 5 star review.
  
 
      Posted on Google  
   
   Ayleen Magana 
 
 
 
 Trustindex verifies that the original source of the review is Google. Josh helped us turn our old tub into a modern walk in shower, and it completely changed the feel of our bathroom. He suggested a tile pattern I never would have thought of, and it looks incredible with the lighting. Every evening before leaving, he cleaned up so well you could barely tell work was being done. The water pressure feels stronger now and the glass enclosure makes the whole room brighter. Couldn’t be happier with how it came out.
  
 
      Posted on Google  
   
   Jessica Lain 
 
 
 
 Trustindex verifies that the original source of the review is Google. I had them convert my tub into a walk-in shower, and it’s easily the best upgrade I’ve done. The tile work is stunning, and the glass enclosure makes the whole bathroom feel bigger. They even added a rainfall showerhead — total game changer.
  
 
      Posted on Google  
   
   Daniela Hernandez 
 
 
 
 Trustindex verifies that the original source of the review is Google. Grand Building Construction in Bellevue did our bathroom remodel after years of putting it off, and I wish we had done it sooner. The crew removed old flooring, updated the plumbing, and created a gorgeous walk-in shower with glass doors. They also added a double vanity that makes mornings so much easier. The project was seamless, and their communication made the whole process stress-free. Our new bathroom is both practical and stunning.