Edgbaston's capacity will be boosted for the 2018 season with the use of a temporary stand.
The Birmingham venue is the biggest cricket venue outside of London with a capacity of 24,550, and now has another tier of seating above its Stanley Barnes stand at the Birmingham End of the ground.
An additional 850 seats will be in place for its seven major match-days, including England's Twenty20 international against Australia on 27th June, the first Test of the five-match series against India in early August and Twenty20 finals day on 15th September.
"This will be the third time in the last four years that we have brought in the temporary stand, which is a direct result of the popularity of the fixtures that we're hosting," said Warwickshire's commercial director Gareth Roberts.
"The Vitality IT20 is now 75 per cent per cent sold out, while year-on-year ticket sales for Vitality Blast Finals Day are 170 per cent up on last year and could sell out before the group stages of the tournament get underway.
"We've also seen huge demand for day three of the Test match against India, which will be a very special occasion as England's 1000th Test."
This year's Vitality Blast finals extravaganza on 15th September will be the last until a return to Birmingham from 2020 onwards.
The 2019 finals day is scheduled to be played at Trent Bridge, home of current holders Nottinghamshire.
Meanwhile, Jason Roy is 6/4 to score a fifty in England's fourth ODI against New Zealand.
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