 | MASSETRANSPORT AS | 982951720 | TRONDHEIM |
| MASSIVBETONG AS | 935120543 | SEL |
| MASSIV LUST AS | 997244605 | OSLO |
| MASTERBAD AS | 927209330 | OSLO |
| MASTER SEALING AS | 925353868 | VERDAL |
| MAST GULV AS | 928222268 | SOLA |
| M.A.T BYGG AS | 935270596 | BERGEN |
| MATEC ØST AS | 998755255 | KONGSVINGER |
| MA TEK AS | 879582512 | SØR-VARANGER |
| MATEMA BYGG AS | 932179180 | AURSKOG-HØLAND |
| MATHIAS BEKKEVOLD | 924010193 | STANGE |
| MATHISEN AS | 951648736 | RINGSAKER |
| MATHISEN BYGGRÅDGIVING | 991784691 | LARVIK |
| MATIZ ARKITEKTUR AS | 931767941 | ULLENSAKER |
| MA TOTALBYGG AS | 990250448 | OSLO |
| MATS ANDRE GJØEN | 925418439 | BJØRNAFJORDEN |
| MATS HUS AS | 967385816 | TANA |
| MAURA BYGG AS | 926038508 | NANNESTAD |
| MAXBO TEKNISKE TJENESTER AS | 924463163 | PORSGRUNN |
| MAXBYGG OG EIENDOM AS | 918765344 | NANNESTAD |
| MAXHARRAJ BYGG OG FUKTTEKNIKK | 832744972 | LILLESAND |
| MAX PFISTER AS | 980464075 | GRIMSTAD |
| MAX-RØR AS | 997836871 | DRAMMEN |
| MAXRØR AS | 997265696 | BERGEN |
| MAXWELL CONSULTING NORWAY AS | 834404702 | ASKER |
| MAXWELL NORGE AS | 913492528 | TRONDHEIM |
| MAZ SERVICE AS | 926574248 | NARVIK |
| MBA ENTREPRENØR AS | 990694001 | RANA |
| MB ANLEGG AS | 820721462 | GAUSDAL |
| MB BYGGSERVICE AS | 925925837 | FROGN |
| M BJØRGUM MASKINSTASJON AS | 980915395 | HOLTÅLEN |
| MBM PROSJEKT AS | 814759032 | LIER |
| MBPROFF AS | 997952340 | KARMØY |
| MB RØRINDUSTRI AS | 928755487 | BAMBLE |
| M BYGG AS | 917583013 | LUNNER |
| M CARLSEN & SØNN AS | 998540860 | GRAN |
| MCE AS | 982837553 | ETNE |
| MC RØR AS | 913015762 | KONGSBERG |
| MD FREMBYGG AS | 931791451 | LIER |
| MDH ARKITEKTER AS | 995117398 | OSLO |
| M DOBLOUG AS | 885866522 | RINGSAKER |
| ME ANLEGGSSERVICE AS | 913169298 | ASKER |
| MEBYR AS | 970942408 | RINGERIKE |
| MECC AS | 829609142 | DRAMMEN |
| MEDALEN MASKIN AS | 995407795 | SIGDAL |
| MEDBY AS | 885873782 | GAUSDAL |
| MED BYGGMESTER AS | 932953226 | PORSGRUNN |
| MEDVIND ARKITEKTUR AS | 925597384 | BÆRUM |
| ME GRAVESERVICE AS | 926886126 | LIER |
| MEINICH ARKITEKTER AS | 925974625 | OSLO |
| MEKVIK MASKIN AS | 914240980 | KRISTIANSUND |
| MELBA VVS AS | 964816565 | OSLO |
| MELBY MASKIN AS | 961611571 | EIDSKOG |
| MELCON AS | 939847065 | AURLAND |
| MELDAL BLIKKENSLAGERVERKSTED AS | 944444378 | ORKLAND |
| MELHUS BYGG & EIENDOM AS | 919932511 | MELHUS |
| MELING BYGGTEKNIKK AS | 925179701 | STAVANGER |
| MELKEVOLL MASKIN AS | 992834013 | STRYN |
| MELLBYE ARKITEKTUR INTERIØR AS | 945844159 | OSLO |
| MELLEBYGG AS | 988975699 | LØRENSKOG |
| MEMBRAN ENTREPRENØR AS | 922237395 | ASKER |
| MEMBRANER OG TAKTEKKING AS | 874402052 | GJERDRUM |
| MEMBRANTAK SERVICE AS | 932267101 | MIDTRE GAULDAL |
| MEMEL BYGG AS | 926401750 | ULLENSAKER |
| MEMM DRIFT AS | 929579798 | TROMSØ |
| MEMO ELEKTRO AS | 985853673 | LØRENSKOG |
| MEMO ELSERVICE AS | 998191246 | LØRENSKOG |
| MEPRO. AS | 821204062 | DRAMMEN |
| MEPRO RØR AS | 912678954 | DRAMMEN |
| MERÅKER VVS AS | 926352458 | MERÅKER |
| MER ARKITEKTUR AS | 939626387 | OSLO |
| MERCUR VVS ENTREPRENØR AS | 920015239 | OSLO |
| MERELEKTRO AS | 917886172 | LØRENSKOG |
| MERK AS | 992675497 | ÅLESUND |
| ME-RO BETONGSAGING AS | 991286659 | LIER |
| MESNA BYGGSERVICE AS | 937322364 | RINGSAKER |
| MESNA RØRLEGGERSERVICE AS | 917127395 | RINGSAKER |
| M. ESPEGARD AS | 989130854 | ÅL |
| MESTA AS | 992804440 | OSLO |
| MEST ENTREPRENØR AS | 931664344 | ÅL |
| MESTERARKITEKT AS | 933283925 | MOSS |
| MESTER BEDRIFTEN BRATFOS RØRSERVICE AS | 924515813 | OSLO |
| MESTERBEDRIFTEN LUND AS | 927443740 | ENEBAKK |
| MESTERBLIKK AS | 876195682 | TRONDHEIM |
| MESTER BLIKK OG TAK AS | 895613142 | DRAMMEN |
| MESTERBOLIG OG BYGGTJENESTE AS | 984342942 | ASKER |
| MESTERBYGG ADAM GLOWACKI | 820477332 | NORDRE FOLLO |
| MESTERBYGG BRYNE AS | 826055022 | TIME |
| MESTERBYGG DOMBÅS AS | 997107780 | DOVRE |
| MESTER BYGG ELVERUM AS | 976335368 | ELVERUM |
| MESTERBYGG HALDEN AS | 965764933 | HALDEN |
| MESTERBYGG JÆREN AS | 994801791 | HÅ |
| MESTERBYGG MOSS AS | 991603026 | MOSS |
| MESTERBYGG NUMEDAL AS | 889031832 | FLESBERG |
| MESTERBYGG SARPSBORG AS | 987195401 | SARPSBORG |
| MESTERBYGG SØR-VEST AS | 935991749 | KVINESDAL |
| MESTERBYGG TROMS AS | 998577632 | MÅLSELV |
| MESTER EIENDOM TØNSBERG AS | 974538229 | TØNSBERG |
| MESTERFLIS SØR AS | 920934706 | KVINESDAL |
| MESTERGRUPPEN ARKITEKTER AS | 960577493 | TRONDHEIM |