Chigwell originally stepped-in to replace failed rival Connaught in September 2010 on a temporary basis.
Islington & Shoreditch has now made the deal permanent and the contract also contains a possible two-year extension.
Chigwell is also launching a 24-hour manned call centre in July to help tenants with a round-the-clock with repair service.
Managing Director Dean Floyd said: “We are always looking to improve the service we provide to our clients.
“We service numerous responsive repairs, reactive maintenance and emergency call out contracts on behalf of our clients and we believe this provides real value to the service we provide.
“The call centre is manned by trained staff, using state of the art technology we have invested heavily in, while ensuring we have the right operatives on the ground to receive and attend emergency call outs.”