We need to build steps from a new extension down to the garden. It's a drop of about 45cm so we need 3 steps. It's from 4m wide sliding doors down to the garden. What's the most economical way to do this? Is it achievable for under £1k?? We went over budget on our build so need to minimise the cost! Also due to covid, we will have time to DIY it if necessary. We're not amazingly highly skilled DIY-ers, but willing to have a go!!