Founded in 1924, MDU Resources has focused growth on areas in which it has expertise. The company is comprised of both regulated and nonregulated businesses that, collectively, operate across much of the U.S. These companies sell a broad spectrum of high-quality products and services primarily related to supporting energy and transportation infrastructure.

• See also:
• Masterformat 2004
• 02 41 00 - Demolition
• 02 41 13 - Selective Site Demolition
• 02 41 16 - Structure Demolition
• 02 41 19 - Selective Structure Demolition
• 03 05 00 - Common Work Results for Concrete
• 03 15 00 - Concrete Accessories
• 03 20 00 - CONCRETE REINFORCING
• 03 24 00 - Fibrous Reinforcing
• 03 40 00 - PRECAST CONCRETE
• 04 20 00 - UNIT MASONRY
• 04 22 00 - Concrete Unit Masonry
• 04 22 19 - Insulated Concrete Unit Masonry
• 04 22 23 - Architectural Concrete Unit Masonry
• 04 22 33 - Interlocking Concrete Unit Masonry
• 04 51 00 - Flue Liner Masonry
• 07 10 00 - DAMPPROOFING AND WATERPROOFING
• 07 19 00 - Water Repellents
• 07 19 13 - Acrylic Water Repellents
• 07 19 16 - Silane Water Repellents
• 07 19 19 - Silicone Water Repellents
• 07 19 23 - Siloxane Water Repellents
• 07 19 26 - Stearate Water Repellents
• 08 95 00 - Vents
• 08 95 13 - Soffit Vents
• 08 95 16 - Wall Vents
• 31 25 00 - Erosion and Sedimentation Controls
• 31 25 13 - Erosion Controls
• 31 25 23 - Rock Barriers
• 31 25 53 - Sedimentation Controls
• 31 25 63 - Rock Basins
• 31 31 00 - Soil Treatment
• 31 31 13 - Rodent Control
• 31 31 16 - Termite Control
• 31 31 19 - Vegetation Control
• 31 32 19 - Geosynthetic Soil Stabilization and Layer Separation
• 31 35 19 - Geosynthetic Slope Protection
• 31 35 23 - Slope Protection with Slope Paving
• 31 36 00 - Gabions
• 31 37 00 - Riprap
• 32 10 00 - BASES, BALLASTS, AND PAVING
• 32 14 00 - Unit Paving
• 32 14 13 - Precast Concrete Unit Paving
• 32 14 16 - Brick Unit Paving
• 32 14 23 - Asphalt Unit Paving
• 32 14 40 - Stone Paving
• 32 15 00 - Aggregate Surfacing
• 32 15 13 - Cinder Surfacing
• 32 15 40 - Crushed Stone Surfacing
• 32 32 00 - Retaining Walls
• 32 32 13 - Cast-in-Place Concrete Retaining Walls
• 32 32 16 - Precast Concrete Retaining Walls
• 32 32 19 - Unit Masonry Retaining Walls
• 32 32 23 - Segmental Retaining Walls
• 32 32 29 - Timber Retaining Walls
• 32 90 00 - PLANTING
• 32 94 00 - Planting Accessories
• 32 94 13 - Landscape Edging
• 32 94 16 - Landscape Timbers
• 32 94 33 - Planters
• 32 94 43 - Tree Grates
• 32 94 46 - Tree Grids
• 33 36 00 - Utility Septic Tanks
• 33 36 33 - Utility Drainage Field
• 33 42 00 - Culverts
• 33 42 13 - Pipe Culverts
• 33 42 16 - Concrete Culverts
• 35 42 00 - Waterway Bank Protection
• Masterformat 1995
• 02220 - Site Demolition
• 02360 - Soil Treatment
• 02370 - Erosion and Sedimentation Control
• 02540 - Septic Tank Systems
• 02640 - Culverts and Manufactured Construction
• 02700 - Bases, Ballasts, Pavements, Appurtenances
• 02730 - Aggregate Surfacing
• 02780 - Unit Pavers
• 02830 - Retaining Walls
• 02900 - Planting
• 02945 - Planting Accessories
• 03050 - Basic Concrete Materials and Methods
• 03150 - Concrete Accessories
• 03200 - Concrete Reinforcement
• 03240 - Fibrous Reinforcing
• 03400 - Precast Concrete
• 04200 - Masonry Units
• 04220 - Concrete Masonry Units
• 04550 - Flue Liners
• 07100 - Dampproofing & Waterproofing
• 07190 - Water Repellents
• 10230 - Vents