- Jasper Conran design
- Jasper Smiths Architecture
- Jassin Ridge & partners sl
- Jast Studio
- JATHO WOHNEN
- JATO Design International Limited
- Jatra Design
- JAUNE
- Jaune Fabrique
- JAVA architecture
- Java Ltd
- Javier Bravo
- JAVIER CASTELLON S.L. UNIPERSONAL
- Javier del Valle
- Javier Negre Diseno
- JAVIER PRIETO ARQUITECTOS
- JAVIER RUIZ MARTINEZ
- javier sanjurjo. architect
- Javier Senosiain Arquitectura Organica