The Family Store with So Much More

Merwin Mason Supply Co.,Inc. was started in 1970 in an old tobacco barn in South Windsor. It later moved to the Chapel Road location where it is today. The company was started by Merwin Pola and his family with just one small pickup truck. Today we have a large showroom and a fleet of trucks with fork-lift unloaders for fast and safe delivery. We are still a family run company and strive to keep that "small business" quality that that gives you the outstanding, personal service you have grown to know and appreciate for the past 30 years. More...


Don't see what you are looking for? Give us a call or come in to our show room and let us show you how we can help get your project started!

Our showroom and yard pickup hours are:

Monday thru Friday
7:00am - 4:00pm
Saturday 8:00 - 12:00 seasonally (call first).

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Retaining Walls


Decorating Outdoors

For most of us, spring, summer and fall brings an enticement with the change of each season. The days grow longer and the lush greens and vivid colors of spring appear. We move our attention out-of-doors and begin focusing on the "outdoor living rooms" of today. Whether it's a new walkway or garden path, patio, retaining wall or a paver driveway, we can help. Many of the newer wall and walk systems flow into their environment without obstructing the natural landscape.

At Merwin Mason Supply we understand your vision and we have the products you need to express your creativity in your projects.


Allan Block Retaining Walls on a terraced slope

Allan Block

Allan Block continuously develops creative and innovative construction products, revolutionizing the way you build. Allan Block helped start the trend toward the stackable retaining wall system and offers the most advanced segmental retaining wall system available on the market. Their patented system offers the easiest, most durable and most cost effective product on the market. This coupled with the flexibility of design; wide assortment of sizes, styles and colors makes Allan Blocks the preferred product for retaining wall construction around the world. We are very pleased to carry this quality product and very happy to consult with you on ways to utilize it on your project.
Anchor Chiselwall Retaining wall system

Anchor Retaining Wall systems

Anchor offers an attractive new alternative to traditional retaining wall blocks, the timeless design of their multiheight wall systems provides maximum versatility. Their systems can provide you with straight, curved and terraced walls as well as corners, columns and steps.
Belgard Old Castle wall on golf course

Belgard Hardscapes Retaining Walls

The popularity of outdoor living spaces is on the rise – and with good reason! A well designed and installed outdoor living feature offers one of the highest return on investment for homeowners when remodeling. Homeowners and trade professionals alike are turning to Belgard Hardscapes products to give them the flexibility to create outdoor kitchens, poolscapes, retaining walls and free-standing wall systems.
Cambridge Armortec Logo

Cambridge Retaining Walls

Cambridge urges you to compare their pavingstones with ArmorTec® to other brands by closely examining driveways, patios and walkways right in your own neighborhood. Among the benefits of Cambridge ArmorTec® are:

The rich colors of ArmorTec® in Cambridge Pavingstones do not show signs of color loss or fading. The "purest-pigmented" color and concrete mix technology, ArmorTec, is concentrated in Cambridge Pavingstones where it counts; the wearing surface that shows after the paver is installed. No blemishes from colorless and unsightly stone particles show. The smooth, abrasion-resistant, surface of Cambridge Pavingstones with ArmorTec® do not show the small holes that detract from the appearance of surrounding surface areas. Cambridge Pavingstones are stronger than poured and stenciled concrete and meet rigorous standards. They are also resistant to chipping, de-icing salts and snow plowing.

Keystone Century Wall system

Keystone Retaining Wall Systems

Keystone wall units essentially started the industry. Keystone units deliver structurally sound, engineered wall systems with superior construction stability, durability, and strength. Architects and engineers rely on the Keystone Standard unit to stand strong when the safety and security of their wall designs matter.

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