Transport for London has developed plans for how the bridge could be repaired, which involves first stabilising the bridge to make it safe for pedestrians, cyclists and river traffic and then strengthening it to allow for general traffic (up to 7.5 tonnes) and buses. The total cost of progressing the works are estimated at c.£130m (including allowances for risk and inflation).
An alternative repair methodology has been proposed by Fosters + Partners / COWI and is being promoted by Hammersmith & Fulham Council. It entails building a temporary structure within the existing bridge, and refurbishing pats of the existing bridge off site. Hammersmith & Fulham Council has commissioned Foster + Partners / COWI to develop this option, and its estimated cost, further. An outcome of this work is expected to be reported to the Hammersmith Bridge Taskforce within the next few weeks.