In 2014 Catalyst purchased the land at Toplocks, located between Maypole Dock, a spur of the Grand Union Canal, Toplocks Estate in Southall, and our sister site at Havelock Estate, which we are currently regenerating.

In early April 2016, we submitted a planning application to the London Borough of Ealing to build 26 affordable homes, along with associated access roads onto Glade Lane and McNair Road, car parking, landscaping and a new footbridge over Maypole Dock to create a new pedestrian/cycle link.

The planning application was approved by Ealing Council’s planning committee in August 2016(opens in a new tab).

The new development will be used as decant accommodation for our Havelock Phase 2 project and consists of 100% affordable rented houses, duplexes and an apartment, each of three and four bedrooms. Construction started in 2018.


Toplocks is currently designated as a Site of Importance for Nature Conservation (SINC) and is part of the wider Local Significant Industrial Site (LSIS) area.

It was agreed with Ealing Council that in order to build on the ecologically bio-diverse site, Catalyst would need to capture the endangered slow worm population on the site and relocate them to the adjacent Glade Lane Canalside Park and also re-provide lost greenspace and habitat; achieved by creating green roofs on a number of the new homes.


Latest development news

Image of homes at Portobello phase 2bCorporate newsDevelopmentNews releases
November 29, 2021

Catalyst appoints Bouygues UK for next phase of Portobello Square

Catalyst has announced that it will be working with Bouygues UK on the next phase of the Portobello Square regeneration at the Wornington Green estate in North Kensington.
Newman Place, Littlemore, OxfordCorporate newsDevelopmentNews releases
November 15, 2021

Catalyst’s Newman Place development in Oxford receives £4.34 million Growth Deal funding

Catalyst’s development of 270 new affordable homes at Newman Place in Oxford has received grant funding through the Oxfordshire Growth Deal.
Cambridge roundtable reportCorporate newsDevelopmentNews releasesPolicy and influencing
November 4, 2021

Catalyst publishes report from Cambridge roundtable discussion on the Arc’s Spatial Framework

Catalyst recently hosted a roundtable discussion in Cambridge, focusing on the role of affordable housing in the Arc project.
step2skills roan westfieldCorporate newsDevelopmentEnvironmental, Social and GovernanceNews releases
November 2, 2021

Catalyst welcomes Step2Skills to Harpenden development to highlight careers in housing, development and construction

Catalyst recently hosted a site visit for employment advisors and mentors from Step2Skills at Hertfordshire County Council’s Adult Care Services.