 | ARTIKON AS | 922217424 | SULA |
| ARTTECH ENTREPRENØR AS | 918371818 | RINGSAKER |
| ARUNAS AS | 997378636 | EIDSVOLL |
| ARVE EIDE AS | 999639240 | ØRLAND |
| ARVE FRAFJORD GRAVING OG TRANSPORT | 942354533 | SOLA |
| ARVE GRINDHEIM ENTREPRENØR AS | 898269752 | AURLAND |
| ARVE HAGEN AS | 998491487 | RINGSAKER |
| ARVE KJÆRLAND GRAVING/SPRENGING | 970051813 | KVINNHERAD |
| ARVE MATHIAS AARØEN | 969631008 | STRYN |
| ARVESEN BYGG AS | 915931456 | SKIEN |
| ARVE SKREDE | 970339140 | STRYN |
| 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 TEKNISKE GRUPPE RØR AS | 927435632 | BERGEN |
| ÅSANE VENTILASJON AS | 813592592 | BERGEN |
| ASAP RØRSERVICE AS | 912273911 | BÆRUM |
| ASAS ARKITEKTUR AS | 954326810 | HAMAR |
| AS BERGEN INSTALLASJON | 965299424 | BERGEN |
| AS BETONG | 828855832 | SANDNES |
| 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 BYGG OG EIENDOMSPROSJEKT | 882067602 | VESTBY |
| 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 |
| ÅSERAL BYGGTJENESTE AS | 988950890 | ÅSERAL |
| 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 |