| ARVE STÅLE OLSEN AS | 946832359 | LARVIK |
| ARVID ELLINGSEN AS | 996012174 | LINDESNES |
| ARVID HANSTAD AS | 929706706 | STANGE |
| ARVID THOMASSEN GRAVESERVICE AS | 923544682 | ALTA |
| ARW ENTREPRENØR AS | 913150325 | TRONDHEIM |
| ASAK ANLEGG AS | 939947914 | LILLESTRØM |
| ÅSANE BYGGMESTERFORRETNING AS | 962116663 | BERGEN |
| ÅSANE RØRLEGGERSERVICE AS | 916643950 | BERGEN |
| ÅSANE VENTILASJON AS | 813592592 | BERGEN |
| ASAP RØRSERVICE AS | 912273911 | BÆRUM |
| ASAS ARKITEKTUR AS | 954326810 | HAMAR |
| AS BERGEN INSTALLASJON | 965299424 | BERGEN |
| AS BETONG | 828855832 | TIME |
| AS Betongbygg | 929257650 | SARPSBORG |
| AS BETONGINDUSTRI | 910564196 | MODALEN |
| ASBJØRN BRANDSRUD AS | 977097711 | INDRE ØSTFOLD |
| ASBJØRN GJELSÅS | 969272776 | SANDEFJORD |
| ASBJØRN HAGENES | 980498468 | RÆLINGEN |
| ASBJØRN NORDSVEEN AS | 963153686 | RINGSAKER |
| ASBJØRNSEN BYGGSERVICE | 915413013 | FREDRIKSTAD |
| ASBJØRN SIMENSEN. AS | 990015996 | ALTA |
| AS BLIKKENSLAGER OLAF HANSEN | 947155431 | TRONDHEIM |
| ASBO AS | 922690189 | EVJE OG HORNNES |
| AS BREDESEN GRAVING & TRANSPORT | 936276083 | SUNNDAL |
| AS Bygghåndverk | 938336776 | OSLO |
| AS BYGGSERVICE | 885918042 | TRONDHEIM |
| ASC EIENDOMSUTVIKLING AS | 992480645 | OSLO |
| AS DE FORENEDE SNEKKERE | 911160803 | OSLO |
| AS DIAMANTBORING | 927811685 | FREDRIKSTAD |
| A/S Elektrisk Produktion | 930451614 | DRAMMEN |
| AS ELEKTROINSTALLASJON | 919231432 | BERGEN |
| ÅSEN & ØVRELID AS | 976742117 | SUNNFJORD |
| ASENTI AS | 933155633 | BÆRUM |
| ÅSERAL BYGGTJENESTE AS | 988950890 | ÅSERAL |
| A/S Even Cudrio | 946995517 | TØNSBERG |
| AS FAKTOTUM ENTREPRENØR | 913624513 | MELHUS |
| ASFALT & MASKIN AS | 960585593 | BERGEN |
| AS Fasade og Bygg Service | 834989522 | BERGEN |
| AS FRODE STOKKE, VVS-VARME-GASS | 917882460 | LIER |
| ÅSGARD ENTREPRENØR AS | 926156306 | LIER |
| ÅSGÅRD RØR OG ENERGI AS | 928177912 | OSLO |
| AS HANØY RIGGBORING | 939746412 | ASKØY |
| AS HAUGLAND VVS | 931442295 | ALVER |
| AS HI-MA | 930582409 | DRAMMEN |
| ASI ELEKTRO AS | 932004879 | TIME |
| AS INDUSTRIVEDLIKEHOLD | 935872189 | VEGÅRSHEI |
| AS JACO | 910386441 | ØVRE EIKER |
| ASKALA ARKITEKTUR AS | 924420502 | ASKER |
| ASK BYGG ENTREPRENØR AS | 934231325 | ASKER |
| ASKELAND BYGG OG REHAB AS | 920404324 | ALVER |