Welcome to this user forum for BT Retail phone and broadband customers.
Who are you trying to place an order with?
Is your address correct on the Royal Mail Postcode Database?
Silver means there is an existing route, but no active connection.
You should just be able to place an order with BT Retail, and the routing would be determined by Openreach. Have you tried placing an order?
https://www.bt.com/products/broadband/deals
Use the address checker on the page below, and post the results, but edit out your address details first.
https://www.broadbandchecker.btwholesale.com/#/ADSL
New builds are normally direct fibre only. Have you asked the developer what arrangements have been made with Openreach to provide fibre?
Is there any Openreach equipment installed in the property, such as a box which looks like this?
if new build do you have something like this fitted
if so what colour are the lights