M & K Electrical Limited
NI 0248/04

M & L Contracts NI Limited
NI 1322/10

M & N Contracts Ltd
NI 1628/13

M & P Bradley Limited
NI 0402/04

M D Electrical Limited
NI 0767/05

M E Crowe Limited
NI 0993/07

M F Contracts Ltd
NI 1728/13

M McG Roadmarks Ltd
NI 1643/13

M McIlwaine & Sons
NI 1480/12

Mac Core Limited
NI 1796/14

Mac Electrics Ltd
NI 0307/04

MacWaste Ltd
NI 0527/04

Maghera Developments Limited
NI 1144/08

Magheraboy Developments Limited
NI 1985/18

Mainline Contracts Ltd
NI1913/16

Mamo Building Services Limited
NI 1885/16

Marcon Fit-Out Ltd
NI 1689/13

Marrs Maintenance Services Ltd
NI 1546/12

Mastercraft Construction UK Limited
NI 1866/15

Maurice Flynn & Sons Ltd
NI 0035/02

Mayfair Civils Limited
NI 1801/04

McAleer & McGarrity Limited
NI 0379/04

McAleer & Rushe Contracts UK Limited
NI 0403/04

McAleer & Teague Ltd
NI 0138/03

McB & C Limited
NI 0182/03

McChrystal Brothers
NI 0470/04

McCormack Site Services (Ireland) Limited T/A McCormack Demolition
NI 0111/03

McCormick Contracts Ltd
NI1959/17

McCrory Access Solutions Ltd
NI 1883/16

McCusker Contracts
NI 1178/09

McCusker Demolition Ltd
NI 1520/12

McElwaine Security Services Ltd
NI 0667/05

McErlean Associates Ltd (MEA) Ltd
NI 1999/18

McEvoy Electrical Ltd
NI 1442/11

McFall Developments
NI 1958/17

McGill Engineering Limited
NI 2011/18

McGinnis Developments Limited
NI 1745/14

McGreevy Construction Limited
NI 1421/11

McGuinness Plumbing
NI 1786/14

McKay Plumbing & Heating
NI 1620/13

McKinley Contracts Ltd
NI 1501/12

MCL Limited
NI 2024/18

McLoughlin Contracts
NI 1764/14

McMackin Contracts Ltd
NI 1290/09

McNicholl Hughes
NI 0505/04

McVeigh Contracts Ltd
NI 1744/14

Meritcom Ltd
NI 1237/09

MFE Ltd
NI 1472/12

Michael Donaghy Painting & Decorating Contractors Ltd
NI 0526/04

Michael Mallon & Sons Contracts
NI 0376/04

Michael McGinn Mechanical Ltd
NI 1559/12

Michael Nugent Limited
NI 0399/04

MIDD Electrical Limited
NI 1896/16

Mill Contracts Limited
NI 1819/14

Mills Contracts Limited
NI 1057/08

MKB Contracts Ltd
NI 1569/12

ML Quinn Construction Ltd
NI 2018/18

MMG Contracts Limited
NI 1946/17

MMM Design & Build Ltd
NI 0938/07

Moffitt & Robinson Construction Ltd
NI 1171/09

Montgomery Refrigeration Limited
NI 0550/04

Mooney Mechanical Installations Ltd
NI 1823/14

Moss Construction (NI) Limited
NI 0192/03

Mountainview Services (Armagh) Ltd
NI 1852/15

Mourne Roads Ltd (Kilkeel)
NI 1595/13

Mourne Windows & Doors
NI 1780/14

MR Mechanical Services Ltd
NI1878/15

MSM Contracts Limited
NI 0113/03

Mulla Construction Limited
NI 0653/05

Mullinsallagh Ltd t/a O B Construction
NI 0716/05

Murray & McEvoy Ltd Electrical Contractors
NI 1391/11

N & A Construction Ltd
NI 1762/14

N A Spence Electrics
NI 0798/06

N C C Systems Limited
NI 1372/10

N K Fencing Limited
NI 0415/04

Nealon Contracts Limited
NI 1978/18

Nevin Electrics Limited
NI 1534/12

Newpark Developments Limited
NI 1929/17

Newton Ground Engineering Ltd
NI 1966/17

Nicor Construction
NI 1145/08

Noel Garrity Painting Contractor
NI 0178/03

Noel McQuaid & Son Ltd
NI 0995/07

Nor-Den Electrical
NI 0469/04

Norlect Engineering (UK) Ltd
NI 0347/04

Northern Archaeological Consultancy Ltd
NI 1818/14

Northern Excavators Ltd
NI 1697/13

Northern Ireland Housing Executive - DLO
NI 1889/16

Northern Tree Services Limited
NI 1481/12

Northwest Mechanical Services Ltd
NI 0714/05

Certified companies