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Repair- Woolshed/Calfshed- Hole in wall

Hi there, I need a quote to repair a hole in a woolshed toilet/calf shed wall. The hole is approx. 30cm by 21cms in size, and the wall is made of one layer of hardboard (approx. 4mm thick). Please see two attached photo's: one of the calf shed-side of the wall, and one of the wooshed toilet side. I would appreciate if you could send your quote through as soon as possible. Cheers.