The phrase "added a considerable" is correct and usable in written English.
It can be used when describing the act of increasing or contributing a significant amount of something, often in a quantitative context.
Example: "The research team added a considerable amount of data to their findings, enhancing the overall quality of the study."
Alternatives: "added a significant" or "contributed a substantial".
Abu Hamza's appeals to the European court of human rights in Strasbourg had added a considerable period to the process, he implied.
The Knowsley Road team have added a considerable physical presence and with the towering figures of Nick Fozzard and Jason Cayless punching holes in the Tigers defence up front, the likes of Jamie Lyon and Long had a field day out wide.
At the time that Tobin was writing, in the second half of the 20th century, speculative pressures against the currencies of developing countries proved particularly difficult to resist, which added a considerable degree of exchange rate risk into, and hence undermined, their trading relationships with other countries.
The sum total of the editions produced by the 15th-century presses is generally put at about 30,000 or upward, to which must be added a considerable percentage for ephemeral literature (e.g., single sheets, cheap romances, ballads, and devotional tracts) that has either perished completely or exists only in fragments.
A number of companies where the per-employee revenue is relatively low, such as O'Reilly Automotive and Starbucks, added a considerable number of jobs last year.
This reclamation work added a considerable area to the central city; the original docks, close to the Exchange area of Princes Street, are now several hundred metres inland.
The percentage of absent probe sets on the P-chip (50%) represents the average of the respective contributions of A- and not-A-probes where the not-A-probes obviously add a considerable larger amount than the A-probes.
More likely than not to be aware of this Borgesian playfulness, Argentine author Pablo Katchadjian decided in 2009 to remix one of Borges's most renowned short stories The Aleph, keeping the original text but adding a considerable amount of his own writing.
If his illness changed him it was to add a considerable dimension to his life outside music in the formation of the José Carreras International Leukaemia Foundation which invests in scientific research as well as matching organ donors with patients and offering practical support.
If you've used a Mophie battery case before, you'll know that it adds a considerable amount of bulk to your phone.
