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Routes 10 & 202 • Southwick, MA

Your Hometown Supplier of Lumber, Building Materials & Hardware Since 1976

ACE Garden Soil on sale 2 for $12

Lawn & Garden

Newest Items

Simpson Strong Tie Outdoor Accents

Outdoor Accents is a new line of decorative hardware, featuring ornamental wood connectors and fasteners. Now you can bring both beauty and strength to outdoor living structures. This is corrosion-resistant hardware accommodates nominal and rough lumber sizes.

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Benjamin Moore® REGAL® Select Exterior Paint‎

Durable finish resists fading, cracking and peeling so your home’s exterior looks freshly painted for years to come. Mildew resistant even in humid conditions. Engineered with Gennex® Color Technology.

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Coast of Maine Stonington Blend Platinum Grower's Mix

An OMRI listed, complex “super soil” designed for high performance growing in containers and large pots. You will not find a better soil for your tomatoes! Growers have also discovered the tremendous results of using Coast of Maine Stonington Blend Growers Mix!

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Wet & Forget Outdoor Hose End Rapid Application

The new Wet and Forget Hose End makes outdoor cleaning quick and easy. The much-awaited hose end was designed with a proprietary nozzle for higher reach and more coverage per bottle. It attaches directly to your hose & sprays up to 30 feet, allowing you to clean hard-to-reach areas.

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Drive-In Service

Drive up to the lumber yard for easy order pick-up.

Our Selection of...


At Interstate Building Supply you can find:
We carry stove pipe black & galvanized plus we carry metal bestus pipe

• A large selection of stems and faucet parts

• Piping for both rough and finish plumbing

• Heating & ac duct work

• Toilets and repair parts

• Vanities and sinks
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• A large selection of car cleaning chemicals

• Tow hitches & Fuses and bulbs
• RV anti freeze & wiper cleaner

• A large selection of canning jars & accessories
• Storage totes & drawers

• Appliance repair parts
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  • Benjamin Moore Paints and Stains
  • Paintbrushes
  • Handy paint containers
  • Deck Stain
  • Cheesecloth


  • Scotts products including: Ortho and Miracle Grow potting soils for variety of plants
  • Johnathan Green grass seed including: Black Beauty, Kentucky Blue, and more
  • Johnathan Green soil improvements: Love Your Soil, Green Up, Mag-i-kal, Verigreen, and Winter Survival
  • Bondie pest control
  • Garden hoses and parts
  • Grass seed spreaders
  • Wheelbarrows
  • Bird feeders & bird seed
  • Ice melt for your winter weather needs