Pool walls out of square

[waste]

If you can live with it being out of square, you can get a custom liner that will fit the pool with no wrinkles. If you're willing to accept a defective pool, the least the builder should do is get you the liner that will fit the pool and not charge you extra for it!

They'll have to break out their tape measures (probably for the first time) and be able to give the liner manufacturer exact measurements of the pool and possibly the floor. Maybe this will teach them to 'measure twice, install once'. And have them leave you a copy of the measurements so you can just order a replacement liner yourself in 20 years, without having to deal with them again, IF they are still in business.