Roktface, in Brighouse, West Yorkshire, is 36m (118ft) high.
The final holds are being installed on what its creators say will be the UK’s highest man-made outdoor climbing wall.
Roktface has been built at the ROKT Climbing Centre in Brighouse, West Yorkshire, on the side of an old grain silo and will provide amateur and professional climbers routes up to 36m (118ft) high.
GB climber Luke Murphy said: “It’s been a real experience setting the routes on Roktface these past few weeks.
“Not many people can say their office is the side of a wall that’s higher than the Tower of London.
“Even I found it a bit surreal, but it’s been great fun installing the holds and I literally can’t wait to properly tackle it when completed.”
ROKT owner Euan Noble said: “We’re on to the final stretch now.
“Around 2,750 holes have been drilled and many of the holds and routes have been installed.”
Mr Noble said he is planning for a mid-May opening.
He said: “If people want to start booking slots, they just need to call or email us as we’ve already had hundreds of inquiries.
“The plan is for this to be big, not just in height, but in national popularity.”