What American timber and dockyards add to a victorious Royal Navy

How would a British victory in 1776 and continued access to American timber and dockyards affect the Royal Navy?

Britain could add substantial numbers of third rates and frigates to later squadrons, materially changing future naval balances.

The Royal Navy would likely exploit the colonies' timber supply and growing dockyard output. Later squadrons could receive another six to twelve third rates, depending on their size, plus more frigates for scouting and commerce duties. Those numbers would alter the balance in subsequent battles and wars. This connects strategic resources to actual hulls rather than treating control of territory as an abstract advantage.