The phrase "allow for additional" is correct and usable in written English.
It can be used when discussing the need to make provisions or accommodations for extra elements or factors in a plan or situation.
Example: "We need to allow for additional time in the project schedule to account for any unforeseen delays."
Alternatives: "make room for extra" or "provide for more".
This would allow for additional roommates.
The session had been scheduled to end on Thursday, but was extended to Friday to allow for additional votes.
Digital TV would offer extraordinarily sharp wide-screen images with surround sound and would allow for additional channels and other enhanced services.
Digital television sets display images at a higher resolution than standard analog sets and allow for additional digital content to be transmitted at the same time.
The production has scaled back to six performances a week to allow for additional creative changes and rehearsals during the day, a spokesman said.
Continental Airlines is asking its passengers to arrive at the airport an hour earlier than usual, to allow for additional security procedures.
As mentioned this morning, a $750 billion placeholder is included to allow for additional spending on the banking system, if necessary.
Part of the building is being removed as it is reduced to 26,000 square feet to comply with zoning requirements involved in the change of use, and to allow for additional parking.
While inspection targets appreciate the arts in schools, the focus remains around literacy and numeracy levels and the decrease in education budgets across the UK doesn't allow for additional cultural provision.
It differs in that the original block ended just below the crank centerline, while the crankcase of recent small blocks extends well below the centerline to allow for additional rigidity.
The users are given different options for both input and output to allow for additional flexibility.
