Business Details
We are a familyowned business that has proudly served the Lafayette community since 1936. With over 85 years of experience, we have become the trusted source for highquality stone, construction materials, and landscaping supplies. Our founders, Ogden Kiesel, and the Magrath family, established a legacy of reliability and customercentric service that continues to guide our operations. We have expanded our facilities and delivery capabilities to meet the growing demands of homeowners, contractors, and commercial developers. Our inventory includes topsoil, compost, gravel, concrete mix, firewood, treated wood, and specialized hardware for every project. We pride ourselves on strict quality standards, ensuring every product is sourced, processed, and stored to industry best practices.
Our delivery network serves Lafayette, Orinda, Moraga, Walnut Creek, Rossmoor, Pleasant Hill, Concord, Martinez, Alamo, Danville, Diablo, San Ramon, and Blackhawk. We are committed to transparent pricing, clear communication, and ontime delivery to keep projects on schedule and within budget. Our team of knowledgeable staff is ready to provide expert advice and customized solutions for any landscaping or construction challenge. We celebrate our heritage while embracing modern techniques and technologies to enhance efficiency and product quality. Our goal is to help you transform your yard or build your next project with confidence and lasting value.
Our delivery network serves Lafayette, Orinda, Moraga, Walnut Creek, Rossmoor, Pleasant Hill, Concord, Martinez, Alamo, Danville, Diablo, San Ramon, and Blackhawk. We are committed to transparent pricing, clear communication, and ontime delivery to keep projects on schedule and within budget. Our team of knowledgeable staff is ready to provide expert advice and customized solutions for any landscaping or construction challenge. We celebrate our heritage while embracing modern techniques and technologies to enhance efficiency and product quality. Our goal is to help you transform your yard or build your next project with confidence and lasting value.
Highlights and features
- We have 85+ years of trusted expertise.
- We are familyowned since 1936.
- We deliver to Lafayette, Orinda, and neighboring cities.
- We provide a wide range of construction materials.
- We maintain strict quality standards for every product.
Services
Stone Boulders
Our Stone Boulders are sourced from local quarries and handselected for durability and aesthetic appeal. They serve landscapers, homeowners, and contractors who need reliable, weatherresistant stones for driveways, pathways, and retaining walls. Customers benefit from our precise grading and competitive pricing, ensuring project success on time and on budget.
Gravel & Decorative Mix
Our Gravel & Decorative Mix blends premium aggregates with finely graded sand to create a versatile, erosioncontrol solution. Designers and construction crews use it for driveways, patios, and drainage systems that require both beauty and durability. Clients enjoy uniform texture, excellent drainage, and a costeffective finish that lasts for years.
Sand & Concrete Mix
Our Sand & Concrete Mix delivers a reliable, highstrength blend for foundations, slabs, and structural elements. Builders and contractors depend on our mix for consistent performance and quick set times, reducing labor costs and schedule delays. The product meets industry standards and is available in bulk for largescale projects.
Firewood
Our Firewood is cut, seasoned, and stored under controlled conditions to ensure optimal burn quality and safety. Homeowners, camps, and commercial kitchens use our firewood for heating, cooking, and ambiance, trusting its consistency and low moisture content. We supply it in bulk or smaller bundles, meeting diverse customer needs efficiently.
Treated Wood
Our Treated Wood is pressuretreated to resist rot, insects, and moisture, making it ideal for outdoor decking, fencing, and garden structures. Landscape architects and DIY homeowners rely on its durability and low maintenance for longlasting projects. We offer a range of sizes and grades to match design specifications and budget constraints.
Reviews (6)
May Q.
Apr 21, 2022
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I ended up going with DiamondK after going to another local rock place and DiamondK. Their price is slightly better and delivery was much cheaper. Kevin was super helpful and friendly. I called and went in a couple times and got a lot of my questions answered. This place has a nice little store with supplies and bagged rocks that are easy to just pick up. I can't believe this place is located in downtown Lafayette
Amber J.
Oct 26, 2021
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Kevin and Courtney have been so helpful providing advice on product and excellent customer service. Diamond K always has the material we need and can deliver quickly. Diamond K is a great local resource for our large suburban- rural lots where we always need something!
Liz M.
Sep 21, 2021
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Professional. I have ordered twice so far. We have a steep driveway and their driver did an amazing job getting into our driveway, asked where we wanted them to place the gravel, and was just a nice person. I also appreciate them answering my questions. Prices were fair and customer service was good. Thank you!
Keegan Stokes
Aug 17, 2021
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Great people! Always accommodating with a busy schedule. A bit on the pricey side, but well worth it for the consistency and reliability.
Susan B.
Aug 10, 2021
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Contrary to some of the older postings, I've had two very good experiences with Diamond K in the past two weeks. I suspect the negative narratives from the previous reviews must have prompted a major overhaul, because everyone I encountered went out of their way to answer my questions and load my car promptly with a very friendly send-off.
Anne C.
Aug 01, 2021
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With the drought looming. I returned to Diamond K for more landscape materials. The Diamond K staff AGAIN knew exactly what materials I should use, the quantity, and the rock material was delivered on time. The Lafayette area is so lucky to have this business in their town!
