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28 HARTFORDBUSINESS.COM | SEPTEMBER 21, 2026 The List MECHANICAL | ELECTRICAL | PLUMBING | SHEET METAL | BUILDING AUTOMATION | FACILITIES SERVICES 860.871.1111 Toll Free: 800.741.6367 nemsi.com License #'s: E1-197483 S1-406020 P1-290301 SM1-975 The company that builds and installs the critical systems in virtually every type of facility is the same company you can rely on to maintain them. For 60 years, our clients have trusted us to deliver end-to-end facilities solutions, so they can focus on their core business. Experts in: Facilities Services, Preventive Maintenance Programs, Onsite Operations & Maintenance NEMSI SERVICE SOLUTIONS INCREASE PRODUCTIVITY. REDUCE COSTS. LARGEST COMMERCIAL CONTRACTORS IN CONNECTICUT Ranked by number of Conn.-based employees (1) Largest commercial contractors in Connecticut Ranked by number of Conn.-based employees ((11)) Contractor Staff statewide/ total staff/ 2025 revenue Contracting specialties Recently completed projects Top executive(s) Year founded 1 O&G Industries Inc. 207 Main St., Suite 200, Hartford 06106 860-489-9261 • ogind.com 930 935 $766 million Concrete, construction manager, general building construction, sitework, water treatment plants Torrington Schools Construction management for 300,000-square-foot complex on 31-acre high school campus for 1,650 students, joining grades 7 through 12 and district's central administration on one campus $185,000,000 Jan. 2025 David Oneglia President Ray & Greg Oneglia Vice chairmen 1923 2 A/Z Corp., a Cianbro Co. 46 Norwich Westerly Road, North Stonington 06359 800-400-2420 • a-zcorp.com 400 600 $363 million Carpentry millwork, concrete, construction manager, demolition, drywall and acoustical, electrical, general building construction, HVAC, plumbing, sitework, telecommunications systems Harold Leever Regional Cancer Center, Waterbury Expansion & renovation with new two- story, 2,100-square-foot addition and renovation of library to create the J. Robert and Mary H. Farr Patient Navigation Center $3,400,000 July 2026 Adam Duczynski President Mack Susi COO 1968 3 Silktown Roofing (2) 27 Pleasant St., Manchester 06040 860-647-0198 • silktownroofing.com 400 1,168 $328 million General building construction, masonry, roofing, waterproofing New Britain Museum of American Art Historic restoration of tile roof and copper trim David S. Klein CEO 1993 4 McPhee Electric LLC 505 Main St., Farmington 06032 860-677-9797 • mcpheeusa.com 350 N/A $240 million Alarm systems, construction manager, electrical, telecommunications systems, water treatment plants PeoplesBank Arena, Hartford $22,000,000 July 2026 Marcus McPhee President 1973 5 Air Temp Mechanical Services Inc. 63 Fuller Way, Berlin 06037 860-953-8888 • ctairtemp.com 200 220 $70 million Energy management systems, HVAC, plumbing Thompson Public Schools HVAC IAQ upgrades $12,000,000 Dec. 2025 Steve Zagurski President 2001 6 Ferguson Contractors 112 Northwest Drive, Plainville 06062 860-747-4566 • fergusoncontractors.com 200 (3) 200 (4) N/A Alarm systems, general building construction, HVAC, plumbing, sheet metal work N/A Ryan L. Ferguson President 1925 7 Richards Corp. 72 North Harwinton Ave., Terryville 06786 860-583-9229 • richardscorp.com 138 138 $85 million Carpentry millwork, concrete, general building construction, sewer and water lines, sitework Bradley International Airport Hangar, Windsor Locks 10,475-square-foot, pre-engineered steel frame designed to house two UH-60 medical evacuation helicopters; interior access to these aircraft will be provided by a single vertical lift fabric hangar door $8,800,000 July 2026 Richard M. Doyle Jr. President James R. Levins Principal 1967 8 Consigli Building Group Inc. 100 Allyn St., Hartford 06103 860-741-9850 • consigli.com 122 2,829 $4 billion Carpentry millwork, concrete, construction manager, demolition, doors and windows, drywall and acoustical, general building construction, painting, waterproofing Sacred Heart University, College of Health Professions, Fairfield Phase 2 of 67,000-square-foot, three- story addition to college $31,600,000 Dec. 2025 Anthony Consigli CEO Matthew Consigli President 1905 9 KBE Building Corp. 76 Batterson Park Road, Farmington 06032 860-284-7110 • kbebuilding.com 118 (5) 127 (5) $323 million (6) Construction manager, general building construction N/A Mike Kolakowski President & CEO 1959 10 All State Construction Inc. 449 Cooke St., Farmington 06032 860-678-0678 • allstateconstructioninc.com 110 110 $45 million General building construction, HVAC, plumbing, sewer and water lines, sitework, water treatment plants Waterbury Schools Upgraded HVAC at 13 elementary schools $11,000,000 Aug. 2025 Marc Pare CEO Pete Pare President 1973 11 Gilbane Building Co. 208 New London Turnpike, Glastonbury 06033 860-368-5100 • gilbaneco.com 102 3,500 $8 billion Construction manager, general building construction Neck River Elementary School, Madison New 91,000-square-foot school to serve 640 pre-K through grade 5 students with updated educational spaces and sustainable energy technologies and geothermal wells $50,000,000 Oct. 2025 Eric Cushman Business leader 1870 12 Standard Builders Inc. 100 Great Meadow Road, Wethersfield 06109 860-594-7143 • standardbuilders.com 101 101 $100 million Carpentry millwork, concrete, construction manager, drywall and acoustical, general building construction, sewer and water lines, sitework N/A Josh Sullivan President 1949 13 Downes Construction Co. 200 Stanley St., New Britain 06051 860-229-3755 • downesco.com 95 N/A $221 million Construction manager, general building construction New London Community Recreation Center $34,000,000 May 2025 David Patrick CEO Tom Romagnoli President 1934 14 The NY-Conn Corp. 5 Shelter Rock Road, Suite 8, Danbury 06810 203-744-9206 • nyconncorp.com 93 97 $36 million Electrical Great Point Studios, Yonkers, N.Y. Complete electrical installation for a 250,000-square-foot production studio with 4,000 amp 277/480-volt electrical service, lighting installation, fire alarm system installation, general electrical wiring $3,900,000 July 2025 Ross J. Rizzo President Stephanie Mastrogiannis Vice president 1989 15 Pat Munger Construction Co. Inc. 750 East Main St., Suite 1, Branford 06405 203-483-3645 • mungerconstruction.com 85 87 $65 million Construction manager, general building construction The Lee Co. Innovation Center, Westbrook 27,500-square-foot facility built to accelerate product development and reinforce Lee's commitment to innovation in miniature $9,156,000 Nov. 2025 David A. DeMaio President, & treasurer Pamela DeMaio Vice president & secretary James DeMaio Vice president, Business operations 1968 16 M. Frank Higgins & Co. Inc. 199 White Oak Drive, Berlin 06037 860-953-6826 • mfhiggins.com 85 92 $28 million Drywall and acoustical, floor covering Connecticut Children's Medical Center New Tower, Hartford Installation of all flooring for renovation and new tower addition $3,800,000 Dec. 2025 Kathleen Cloud President 1952 17 Pavarini North East Construction Co., part of STO Building Group One Star Point, 333 Ludlow St., 4th Floor, Stamford 06902 203-327-0100 • stobuildinggroup.com/pavarini- northeast 77 5,726 $221 million Construction manager, general building construction, sitework Wegmans, Norwalk 94,000-square-foot supermarket and 8,000-square-foot retail white-box building on 12-acre campus $91,584,123 July 2025 Michael Melanophy Senior regional VP 1896 18 A1 Home Improvement 1348 Berlin Turnpike, Berlin 06037 860-259-6783 • a1roofproct.com 73 N/A $25 million Roofing, solar electric Achieve Financial Credit Union, Berlin Partial roof replacement July 2026 Zachary Ziegler Owner Korrin Leslie Operations manager 1999 19 STV Construction Inc. 280 Trumbull St., Hartford 06103 860-882-5600 • stvinc.com 70 3,600 $842 million Construction manager Downtown Evening Soup Kitchen, New Haven Program management for food services & healthcare facility $3,250,000 Oct. 2025 Jim Kolb Senior vice president & New England regional director Mark M. DuPre Vice president & area manager 1912 20 Dimeo Construction Co. 700 State St., New Haven 06511 203-777-5410 • dimeo.com 70 305 $647 million Construction manager, general building construction PeoplesBank Arena, Hartford New premium clubs and lounges, loge boxes replacement of the lower bowl seating, new locker rooms, upgrades to Wolf Pack Locker Room, new concessions & food stations, full- service kitchen, roof replacement and major mechanical, plumbing and electrical infrastructure upgrades $145,000,000 Bradford S. Dimeo Chairman Stephen F. Rutledge President & CEO Christopher Doepper COO & executive VP 1930 22 70 Griffin Road South, Bloomfield 06002 860-242-5565 • bbeinc.com 69 $90 million construction expansion $40,000,000 April 2025 Noal Jenkins COO 1921 23 Crest Mechanical Services Inc. 41 Walnut St., Hartford 06120 860-724-3431 • crestmechanical.com 63 63 $20 million HVAC, plumbing Middlesex Health, Cromwell HVAC & plumbing scopes for new medical building with offices, exam spaces and minor procedure rooms $3,100,000 Nov. 2025 Nathan Breglio President & CEO 1964 24 AmeriTech Contracting 599 Research Parkway, Meriden 06450 860-215-8972 • ameritechcontracting.com 61 102 $37 million General building construction VA Medical Center, West Roxbury, Mass. Replaced aging roof of building with indoor pool $867,153 May 2025 Drew S. DiSilvestro Jr. CEO 2020 25 The Associated Construction Co. 55 Airport Road, Suite 206, Hartford 06114 860-296-4114 • accgc.com 60 (5) 60 (5) $75 million (6) General building construction, water treatment plants N/A Joseph D. Jankowski President Kevin McConnell Vice president 1943 26 Haynes Construction Co. 32 Progress Ave., Seymour 06483 203-888-9048 • haynesct.com 55 78 $200 million Construction manager, general building construction Triton Square, Groton Three new residential apartment buildings with pool, common areas and market-rate units $69,146,419 July 2025 Bruce Brown CEO 1962 27 Haven Steel Erectors Inc. 1575 Boston Post Road, Guilford 06437 646-567-9677 • havensteelco.com 55 85 $8 million Iron structural Amazon Schooner, Johnston, R.I. Kaia Monroe Rarick CEO Parrish Rarick President 2018 28 D'Amato Construction Co. Inc. 10 Main St., Bristol 06010 860-583-3489 • damatoconstruction.com 50 50 $30 million Concrete, construction manager, demolition, general building construction, plumbing, sewer and water lines, sitework, water treatment plants Bristol City Hall Thomas D'Amato Edward D'Amato Jr. Vice presidents 1961 29 Classic Turf Co. 437 Sherman Hill Road, Woodbury 06798 203-263-0800 • classicturf.org 49 N/A $30 million Concrete, sitework University of Hartford Reconstruction of running track utilizing post-tension concrete $4,343,998 March 2025 John Eren President 1996 30 Total Communications Inc. 333 Burnham St., East Hartford 06108 860-282-9999 • totalcomm.com 47 55 $30 million Telecommunications systems Meriden Library Cabling upgrade to existing library June 2026 Scott Lennon President & CEO 1980 31 Viking Construction Inc. 1387 Seaview Ave., Bridgeport 06607 203-353-0260 • vikingconstruction.net 46 46 $85 million Construction manager, general building construction CT Humane Society Pet Resource Center, Wilton One-story, 14,000-square-foot pet healthcare & adoption facility and veterinarian clinic with surgical & dental services and outdoor areas $17,000,000 Aug. 2025 Anthony Gaglio Jr. Vice president 1991 32 PDS Engineering & Construction Inc. 107 Old Windsor Road, Bloomfield 06002 860-242-8586 • pdsec.com 45 45 $70 million Construction manager, general building construction Burns Latino Studies Academy, Hartford 110,000-square-foot school renovation $50,000,000 Aug. 2026 Bill Jodice President 1965 33 C-TEC Solar LLC 1 Griffin Road South, Bloomfield 06002 860-580-7174 • ctecsolar.com 40 58 $32 million Solar electric Ellington Solar Farm Phase 2 completed with agrovoltaics on site & pollinators included; total project 8.6MW $7,300,000 Oct. 2025 Michael Toro President 2011 34 DuBaldo D. Electric Co. 16 Harrison St., Manchester 06040 860-649-1000 • dubaldo.com 40 40 $8 million Alarm systems, electrical, telecommunications systems Stonebridge Apartments, Cheshire 300 new apartments $5,000,000 Aug. 2025 Don DuBaldo President 1999 35 Network Interiors Inc. 55 Robert Jackson Way, Plainville 06062 860-793-1188 • network-interiors.com 37 37 $8 million Drywall and acoustical Kingswood Oxford School Community Commons, West Hartford Renovation and addition $1,089,186 Nov. 2025 Melissa Sheffy President Jacqueline Laramee Vice president 1991 36 PAC Group LLC 126 South Main St., Suite 200, Torrington 06790 860-485-9363 • pacgroupllc.com 36 N/A $80 million Construction manager Fair Haven Community Health Center, New Haven 35,560-square-foot expansion of main campus $25,000,000 Sept. 2025 Zach Prenoveau President 1997 37 Olsen Construction Services 21 Deming Road, Berlin 06037 860-610-1093 • olsencs.com 36 36 $61 million Construction manager, general building construction Lockton, Boston, Mass. Fast track interior renovation with high- end finishes on the 15th floor of high rise tower $5,500,000 Dec. 2025 Nick Olsen President Frank Maruca Executive vice president 2000 Source: Each contractor via survey as of Q3 2026. Note: Farmington's FIP Construction no longer discloses data for the list. N/A = Not available. See the full list at hartfordbusiness.com/data/construction/ with more than 70 commercial contractors and more than 100 construction projects at hartfordbusiness.com/data/construct-projects/. (1) Hartford Business Journal is in the process of expanding all of its lists to include companies statewide. Please reach out to research@nebusinessmedia.com to be included on the list. (2) Part of Greenwood Industries. (3) From fergusoncontractors.com; 270 reported on HBJ's 2024 survey. (4) From fergusoncontractors.com; 275 reported on HBJ's 2024 survey. (5) From HBJ's 2025 survey. (6) 2024 revenue. -Compiled by: Stephanie R. Meagher, research@nebusinessmedia.com SEE THE FULL LIST AT hartfordbusiness.com/data/construction/ with more than 70 commercial contractors and more than 100 construction projects at hartfordbusiness.com/data/construct-projects/.