Overview

Working in partnership with Caerphilly County Borough Council and Welsh Government, not-for-profit housing organisation United Welsh has officially started work on the former Windsor Colliery site. This project will see the development of 152 new homes next to Ysgol Ifor Bach in Abertridwr.

The development will include houses and apartments available for social rent, affordable rent and sale. The homes will be entirely off-gas and built to the highest energy efficiency standards, helping to reduce the development’s carbon footprint and providing homes for residents that are cost-effective to heat.

The homes will be built by Celtic Offsite, a social enterprise within the United Welsh Group. Celtic Offsite will manufacture the timber frame structures from its factory in Caerphilly, with the homes being completed on-site by contractor M&J Cosgrove.

To celebrate the start of the work, United Welsh commissioned local illustrator Chris Morgan to work with pupils from nearby school Ysgol Ifor Bach to create a mural. The art celebrates Abertridwr’s history, its community and each student’s connection to the area.

The mural was revealed the students from Ysgol Ifor Bach in May, located next to the entrance of the school for children and parents to enjoy.

The development is funded by Welsh Government’s Social Housing Grant and the Cardiff Capital Region’s Viability Gap Fund, a £35m grant programme to bring forward stalled sites for development across the Cardiff Capital Region.

Remediation works are currently taking place by construction company Prichard’s. Phase two will begin in early 2026, with the development expecting to be complete in 2028.