ก่อด้วยภูมิปัญญาความกล้า แกร่ง
เข้มแข็งลือเลื่องเรือง ฤทธา
ลูกพระพายไวว่องล่อง เวหา
มรรคาคุณธรรมมุ่งนำ ทาง
คือคุณค่าภารกิจประ สิทธิสร้าง
คือแนวทางส่อง ทิศเลิศ “ฤทธา”

คำประพันธ์ : จิระนันท์ พิตรปรีชา
Ritta Company Limited was founded on 26th October 1987 with a registered capital of one million Baht and increased to five hundred fifty million Baht on 21st January 2005.

Ritta Company Limited  is a congruent concentration of Thai engineers possessing knowledge, ability, concept, principle and practice providing real professional engineering services in design and construction.  The collective track record is worth more than five hundred billion baht, e.g., large department store, condominium, building, house, road, airport, factory, power plant, hospital, etc., that are appreciated by local and foreign clients. 

is at the forefront of the construction industry in Thailand carrying out the work with professional care and just achieving Certification of quality management system (ISO9001) from Bureau Veritas (BV) under the accreditation of the National Accreditation Council of Thailand (NAC) and the United Kingdom Accreditation Service (UKAS).

The head office is located at the inbound direction of motorway near the entrance to Suvarnabhumi Airport.  The building received “Gold Certificate” under LEED (Leadership in Energy and Environmental Design) system by U.S. Green Building Council to be an energy efficient and environmental friendly building on 24th April 2011.
RITTA: - Provide sense of comfort to the clients and colleagues
- Pride of the staff
- Make the impossible possible.
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