 | M BJØRGUM MASKINSTASJON AS | 980915395 | HOLTÅLEN |
| MBM PROSJEKT AS | 814759032 | LIER |
| MBPROFF AS | 997952340 | KARMØY |
| MB RØRINDUSTRI AS | 928755487 | BAMBLE |
| MB VVS AS | 929557328 | OSLO |
| M BYGG AS | 917583013 | LUNNER |
| M CARLSEN & SØNN AS | 998540860 | GRAN |
| MC RØR AS | 913015762 | KONGSBERG |
| MD FREMBYGG AS | 931791451 | LIER |
| MDH ARKITEKTER AS | 995117398 | OSLO |
| MDM BYGG AS | 822205542 | STAVANGER |
| M DOBLOUG AS | 885866522 | RINGSAKER |
| ME ANLEGGSSERVICE AS | 913169298 | ASKER |
| MEDALEN MASKIN AS | 995407795 | SIGDAL |
| MEDBY AS | 885873782 | GAUSDAL |
| MED BYGGMESTER AS | 932953226 | PORSGRUNN |
| MEDHUS AS | 921378920 | ÅL |
| MEDVIND ARKITEKTUR AS | 925597384 | BÆRUM |
| MEINICH ARKITEKTER AS | 925974625 | OSLO |
| MEKVIK MASKIN AS | 914240980 | KRISTIANSUND |
| MELAND BYGG OG LANDBRUK | 992338245 | HJELMELAND |
| MELANDS RØRSERVICE AS | 916251793 | TRONDHEIM |
| MELBA VVS AS | 964816565 | OSLO |
| MELBY MASKIN AS | 961611571 | EIDSKOG |
| MELCON AS | 939847065 | AURLAND |
| MELDAL BLIKKENSLAGERVERKSTED AS | 944444378 | ORKLAND |
| MELHUS BETONG AS | 928456811 | MELHUS |
| 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 |
| MELLEMSTRAND ANLEGGSERVICE AS | 992121386 | KLEPP |
| MELLES RØRLEGGER AS | 923668861 | KRISTIANSAND |
| MELSOM ARKITEKTUR | 931431358 | OSLO |
| MELUM MASKIN AS | 913772261 | SKIEN |
| MEMBRANER OG TAKTEKKING AS | 874402052 | GJERDRUM |
| MEMM DRIFT AS | 929579798 | TROMSØ |
| MEMO ELEKTRO AS | 985853673 | LØRENSKOG |
| MEMO ELSERVICE AS | 998191246 | LØRENSKOG |
| MEPRO RØR AS | 912678954 | DRAMMEN |
| MERÅKER VVS AS | 926352458 | MERÅKER |
| MER ARKITEKTUR AS | 939626387 | OSLO |
| MERCUR VVS AS | 915088384 | OSLO |
| MERCUR VVS ENTREPRENØR AS | 920015239 | OSLO |
| MERIKON AS | 912226395 | NES |
| MERK AS | 992675497 | ÅLESUND |
| ME-RO BETONGSAGING AS | 991286659 | LIER |
| MESNA BYGG AS | 929347927 | RINGSAKER |
| MESNA RØRLEGGERSERVICE AS | 917127395 | RINGSAKER |