The charities, which appointed Amanda Ball as group marketing director in February, are wary of losing the search engine optimisation equity their currently separate websites have built up when they launch a new site.
According to Steak, the migration process needs to be thought out and simply redirecting users searching for the old brand terms will result "in a poor user experience and, as a result, a high bounce rate and waste in natural search traffic".
The agency will initially carry out a comprehensive audit of the charities' current sites assessing visibility and traffic, content and link profiles before creating a migration strategy.
Steak will ensure that the new site maintains current natural search equity by mapping permanent URL redirects to the most appropriate landing pages and consolidating key onsite content -- all designed to guarantee visibility in natural search listings and high levels of traffic through to the website.
Anna Slosmanis, online marketing manager at Help the Aged, said: "Creating a new digital presence for the organisation is an exciting challenge, part of which is ensuring that we retain the SEO equity held by existing sites."