MATERIALS. SOLUTIONS. RELIABLE SERVICE.

Your Partner in Building Success

We supply the building materials and exterior products you need for every phase of your project, backed by responsive support and dependable service from start to finish.

FABRICATED WITH PRECISION. BACKED BY SERVICE.

If you can draw it, we can bend it.

We work closely with contractors, builders, and design professionals to provide practical recommendations, careful fabrication, and responsive support that keeps projects moving.

What We Do

Rainier Building Supply offers exterior building materials and provides in-house sheet metal fabrication for residential, multifamily, and commercial projects. We work closely with our customers to recommend appropriate materials, support waterproofing details, and fabricate job-specific flashing with care and attention to real-world conditions.

OUR Products

Siding & Roofing

Decking

Weather-Resistive Barriers

Fasteners

Tools

Accessories

Sealant & Adhesives

Fabrication

Product & Waterproofing Support

Sheet Metal (Custom Fabrication)

Job-specific flashing and trim

Standard and custom profiles

Built for waterproofing, drainage, and longevity

Fabricated in-house for accuracy and turnaround

WHY RAINIER BUILDING SUPPLY

Who We Work With

We work with a wide range of professionals across Washington and beyond, providing the products, fabrication, and support needed to keep projects moving forward.

Trusted by Our Clients

EXT Envelope Solutions

People and service are awesome! Pricing on envelope package was good. They also helped me design and fabricate a difficult flashing for water management. Highly recommend!

Oleksiy Sakseev

The best one

Pavel Khitsko

They work professionally and quickly! I highly recommend them to everyone!

Petro Matsiuk

Thank you so much for good service!

Sung Jin Park

Very friendly crews!!!

Jose Rosales

Best placmce to find everything you need in one stop, Location is super convenient service very friendly an fast turn round on orders.

sirogaa

We’ve been working with this supplier for a while now, and their service has been excellent. Orders are always accurate, delivered on time, and the product quality consistently meets or exceeds expectations. Communication is smooth and professional, and they always go the extra mile to make sure we’re satisfied. Highly recommend them to anyone looking for a reliable and trustworthy partner.

mario gonzalez

I really friendly service and always in time

Washington Weather Shield

We have been buying custom flashings from RBS since the day they opened. The team is a huge pleasure to work with. Great pricing and quality work! Very flexible on turnaround time and deliveries. We could not be happier and would recommend them to anyone. Thank you, Oleg, Daniel, David, and Erick, for making our job easy!