 | ALLBYGG AS | 918709363 | BERGEN |
| ALLBYGG FLORØ AS | 979953852 | KINN |
| ALL BYGGSERVICE AS | 919041633 | RÅDE |
| ALLFUG AS | 942322704 | GJESDAL |
| ALLIANCE ARKITEKTURSTUDIO AS | 988437433 | OSLO |
| ALLIANSEN DEGERDAL KØIEN RØR AS | 875368362 | LILLESTRØM |
| ALLIERO AS | 980920569 | OSLO |
| ALL-RØR AS | 978653677 | TRONDHEIM |
| ALL-RØRFORNYING AS | 923994750 | TRONDHEIM |
| ALLSIDIG ARKITEKT AS | 916544987 | TRONDHEIM |
| ALLSIDIG BYGG AS | 916635400 | MOLDE |
| ALLSIDIGE BYGG AS | 997203259 | ENEBAKK |
| ALLSIDIGE VVS AS | 975349128 | RÆLINGEN |
| ALLTAK AS | 816561892 | LØRENSKOG |
| ALLTID MILJØ AS | 924861363 | RÆLINGEN |
| ALLUM BYGG AS | 944485368 | LARVIK |
| ALLUM TRANSPORT AS | 858041732 | SILJAN |
| ALMAAS & SVEDAHL BYGGEFIRMA AS | 913856732 | TRONDHEIM |
| ALMA EIK AS | 998876605 | KRISTIANSAND |
| ALMÅS BYGG & BETONG AS | 925441139 | STORD |
| ALMÅS BYGG OG SNEKKERSERVICE | 814401332 | SANDEFJORD |
| ALMÅS MASKIN AS | 951843741 | MIDTRE GAULDAL |
| ALNA ELEKTRO AS | 917290970 | OSLO |
| ALNA RØR AS | 927075024 | LILLESTRØM |
| ALPHA ARKITEKTER AS | 976019474 | ARENDAL |
| ALPHA CONSULT AS | 920259472 | STORD |
| ALPHA ELEKTRO AS | 915767362 | NITTEDAL |
| ALPHA RØR-SERVICE ANTREA PAPAS | 928828913 | LILLESTRØM |
| ÅL RØRSERVICE AS | 885080642 | ÅL |
| ALRØR SERVIS VVS ALEKS CARKAJ | 923544798 | OSLO |
| ALSAKER BYGG OG RØRLEGGERSERVICE AS | 998151309 | BERGEN |
| ALSAKER STÅL AS | 930405361 | ASKØY |
| ALSTAD ENTREPRENØR AS | 912177211 | STEINKJER |
| ALSTAD MASKIN AS | 915920918 | BODØ |
| ALSTAD PUKK AS | 929417399 | HEIM |
| ALSTEN BYGG AS | 886443412 | ALSTAHAUG |
| ALSTEN MASKINSTASJON AS | 959260494 | ALSTAHAUG |
| ALTA BYGGSERVICE AS | 920364667 | ALTA |
| ALTA EL AS | 978632408 | ALTA |
| ALTA GRAVESERVICE AS | 998529832 | ALTA |
| ALTA GRAVING OG TRANSPORT AS | 986695508 | ALTA |
| ALT.ARKITEKTUR AS | 989622943 | OSLO |
| ALT A RØR AS | 987216549 | ALTA |
| ALTBYGG AS | 998742803 | BERGEN |
| ALT HEIS AS | 922758832 | BERGEN |
| ALT I ANLEGG AS | 925160822 | ARENDAL |
| ALT I ASFALT AS | 995676605 | GJERDRUM |
| ALTIBYGG BERGEN AS | 921407696 | BERGEN |
| ALT I BYGG KONGSBERG AS | 998573831 | KONGSBERG |
| ALTI-EL AS | 928736970 | KONGSBERG |