- Kathy Shaffer Architecture & Design (KSA)
- katia ceccarelli
- Katia Gasparello
- Katia Rebucini
- Katia Zaccanti
- Katia Zecchin Architetto
- Katia's Creations
- KATIMEX Cielker GmbH
- Katja Söchting Interior Design
- KATORI archi+design associates
- KATRE SRL - STUDIO BISIGNANI
- Katrien Herdewyn
- Katrine Skavlan
- Katsutoshi Sasaki + Associates
- KATY'S LINE
- KATZBECK
- KÄUFER ITALIA
- Kauffmann Architects
- KAUFMANN GMBH
- Kaufmann Keramik GmbH
- Kauh arquitectura & paisajismo
- Kaunitz Yeung Architecture
- Kauppi & Kauppi
- kaupunki
- kaupunki
- KAUTZ Starkstrom-Anlagen GmbH
- kavakava
- KAVELLARIS URBAN DESIGN
- KAVITEL SRL
- KAW architecten
- KAWAGUCHI & ENGINEERS
- KAWAKUBO TOMOYASU Architects & Associates
- kawazoe architects
- KAWNEER France
- Kay Elliott