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| LANDSKAPSMESTEREN AS | 925923257 | OSLO |
| LARK LANDSKAP AS | 914412684 | OSLO |
| LAVASOX AS | 997712528 | OSLO |
| LEITHE & CHRISTIANSEN AS | 919513845 | OSLO |
| LEKKASJETEKNIKK AS | 930698253 | OSLO |
| LERCHE ARKITEKTER AS | 946890987 | OSLO |
| LERDAL BYGG AS | 830857192 | OSLO |
| LIAN HEIS AS | 921194005 | OSLO |
| LID VENTILASJON AS | 977482933 | OSLO |
| LIENTO AS | 927216485 | OSLO |
| LIE ØYEN ARKITEKTER AS | 946736953 | OSLO |
| LILLESTRØM RØRSERVICE AS | 921957300 | OSLO |
| LINJE ARKITEKTUR AS | 988420603 | OSLO |
| LINK ARKITEKTUR AS | 975999726 | OSLO |
| LMK BYGG AS | 922083789 | OSLO |
| LMR ARKITEKTUR AS | 921760906 | OSLO |
| LOF ARKITEKTER AS | 987260823 | OSLO |
| LOGG ARKITEKTER AS | 979663633 | OSLO |
| LOHNE & LAURITZSEN AS | 918478256 | OSLO |
| LØKELAND AS | 989129635 | OSLO |
| LONGVA ARKITEKTER AS | 960092813 | OSLO |
| LOS ARKITEKTUR + DESIGN | 926848623 | OSLO |
| LØVSETH OG PARTNERE AS | 986389520 | OSLO |
| LPO ARKITEKTER AS | 934007514 | OSLO |
| LUFTKVALITET AS | 947022148 | OSLO |
| LUND HAGEM ARKITEKTER AS | 957251471 | OSLO |
| LUND+SLAATTO ARKITEKTER AS | 943436347 | OSLO |
| LUTRO BYGG & EIENDOM AS | 986218122 | OSLO |
| LYSAKER ELEKTRISKE AS | 920060188 | OSLO |
| LYSMESTER`N AS | 986047042 | OSLO |
| LYS OG VARME AS | 977356067 | OSLO |
| LYSPUNKTET AS | 975360296 | OSLO |
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| MA BYGG & VVS AS | 929094018 | OSLO |
| MAD OSLO AS | 916087578 | OSLO |
| MA ENTREPRENØR AS | 990250448 | OSLO |
| MAGNE MAGLER WIGGEN SIVILARKITEKTER MNAL AS | 979423705 | OSLO |
| MAKE ARKITEKTER AS | 813016702 | OSLO |
| MAKE MAKE AS | 927761807 | OSLO |
| MALAK RØRSERVICE AS | 913916034 | OSLO |
| MALARCHITECTURE AS | 998597919 | OSLO |
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| MALERMESTER JENS PETTER LUNDE AS | 939640533 | OSLO |
| MALERMESTRENE JUUHL & BRATFOSS AS | 997327888 | OSLO |
| MALERSVENN ANTONIO DIAS AS | 992006528 | OSLO |
| MANGLERUD RØRLEGGERBEDRIFT AS | 990400970 | OSLO |
| MANNIMASKIN AS | 920262023 | OSLO |