The phrase "a need to extend" is correct and usable in written English.
It can be used when discussing the necessity or requirement to broaden, lengthen, or increase something, such as a deadline, a project, or a service.
Example: "There is a need to extend the deadline for the project to ensure all team members can contribute effectively."
Alternatives: "a requirement to broaden" or "a necessity to lengthen".
He was non-committal meanwhile on whether there was still a need to extend the end-of-March deadline for signing up and he and other Democrats had previously advocated.
"While this is an important first step, there is a need to extend this more widely to content from outside the UK and to ensure that families are making the most of the tools available.
The market is diversifying and AWS sees a need to extend its dominance in the market.
But he also realized that there's a need to extend that communication outside of company, too.
There is a need to extend classical scheduling models, so that they are able to better represent the factory.
However, there is a need to extend the use of in vitro tests to hazard characterisation and risk assessment.
Thus, there is a currently a pressing need to extend pMHC multimer technology to a point where it can be used to stain all antigen-specific T cells in all biological systems.
A sensitivity test of this geodetic network showed a clear need to extend it to cover the full island for volcano monitoring purposes.
There is a strong need to extend the traditional topics such as feedback control, with topics concerning condition monitoring and automatic fault diagnosis.
The SSE Education Committee (renamed Education and Outreach by the SSE Council in 2011) was established in 1997 under the leadership of Dr. Irene Eckstrand (NIH), motivated by a perceived need to extend the SSE profile to encompass outreach, especially to K-12 educators.
In this regard, there is a clear need to extend the metrics set to consider general objective functions in order to compute complex properties in other software architectures where feature interaction influences are more complex.
