Patrwm 21 has been developed by private sector specialists in the construction industry.

The continuity of this experienced team is key to the models viability; streamlining design and delivery and befitting from the established relationships and lessons learned.


Dawnus is the largest building and civil engineering employer in Wales and is leading the way in high quality, innovative, sustainable school delivery. Since its inception in 2001, Dawnus has built an impressive list of both private and public sector clients, and has an enviable reputation for delivering excellence. 

Dawnus holds a unique position in the construction industry,  delivering a high percentage of works using directly employed staff, site operatives and plant operatives and in-house resources for mechanical and electrical and geotechnical services.

The continued growth of the Dawnus business through innovative and sustainable projects positively contributes social and economic benefit whilst providing better educational environments for our future generations.



Architype are an award winning architectural practice with 34 years experience in sustainable and education sector design. The practice delivered the first Passivhaus schools in the UK in 2011; detailed monitoring of which has formed a key part of the evidence based model for Patrwm 21. The practice has since developed a strong portfolio of certified Passivhaus projects across a variety of sectors.




The Cardiff division of internationally acclaimed engineers, WSP have played a key role in creating the standardised options for Patrwm 21. Their understanding of the Passivhaus standard is key to achieving the cost certainty that Patrwm 21 offers.