| Company name | Reg. code |
|---|---|
| U2 BUILD OÜ | 16831364 |
| BUILD 4U OÜ kustutatud | 12556458 |
| BUILD4U OÜ | 14790402 |
| UPA BUILDING OÜ | 11449499 |
| UNDO BUILDER OÜ | 10931797 |
| ULV BUILDING OÜ kustutatud | 16445359 |
| U.R BUILDING OÜ kustutatud | 11407220 |
| URBANCORE BUILD OÜ | 17464494 |
| LET'S BUILD UNICORNS OÜ (former name BALTLINK Group OÜ) | 14843819 |
| JAMELIA OÜ (former name EstNor Build OÜ) | 14566337 |
| NRF VENTILATION SYSTEM OÜ kustutatud (former name Balthouse Build OÜ) | 14090521 |
| SVENSK RÖR ENTREPRENAD 0Ü OÜ kustutatud (former name Star Building OÜ) | 14037981 |
| COLPETTY NUGEGODA OÜ kustutatud (former name Refmek Building OÜ) | 14057713 |
| AMIRON SERVICE OÜ kustutatud (former name Amiron Building OÜ) | 14229686 |
| SPORTCORNER OÜ kustutatud (former name Scanvic Building OÜ) | 12987684 |
| RIFNORD OÜ (former name R.R Building OÜ) | 14850535 |
| DC COMBINATION OÜ kustutatud (former name Scanvic Building OÜ) | 12933553 |
| MMAETKALLUTISTER OÜ (former name DES Building OÜ) | 14702792 |
| SONIQUETE OÜ (former name 5+Build OÜ) | 16726578 |
| NP SCAFFOLDING OÜ kustutatud (former name Amiron Building OÜ) | 12886339 |
| TJ ENTREPRENAD & AKERI BEMANNING INVEST OÜ kustutatud (former name Amiron Building OÜ) | 12951580 |
| RIFUS INVESTMENTS OÜ (former name Scanhold Building OÜ) | 12984504 |
| N.V SOLUTION OÜ (former name DDR Building OÜ) | 14752778 |
| DREI DIGITAL OÜ (former name XL Building OÜ) | 14354724 |
| TAMMLAANE KODU OÜ (former name Astro Building OÜ) | 12929385 |
| TRITONSOLUTIONS OÜ kustutatud (former name BuildPartner OÜ) | 14882392 |
| RSIMEDIA OÜ (former name J&A Building UÜ) | 12885707 |
| KASSALA WADSHAREFY OÜ (former name VOP Build UÜ) | 12879948 |
| ÖSEL INFRA OÜ (former name Recona Build UÜ) | 16355024 |
| LAZIMPAT KHUSIBUN OÜ (former name Building Service UÜ) | 14560607 |
| WALDMAN OÜ (former name Trenex Building UÜ) | 14518137 |
| MASSUR KETTU OÜ (former name Foxter Building UÜ) | 14476829 |
| MAFALALA EMBAIXADA OÜ kustutatud (former name XMC Building UÜ) | 12958406 |
| LEPS EHITUS OÜ kustutatud (former name Eesti Build24 UÜ) | 14309356 |
| RUBIRIZI LUTOTO OÜ (former name Builderius UÜ) | 14085715 |