Build the account around who pulls the permit, not around product lines
The clearest way to split a window and door account in this market is by the job's administrative shape, because that is what actually drives cost.
A whole house replacement in a brick home, a single patio door swap, and a landlord replacing units across a small portfolio are three different sales. They have different ticket sizes, different close rates, and different amounts of paperwork before anyone installs anything.
Group campaigns so that budget cannot slide between them. Whole house replacement in one, doors in another, and anything that involves a property manager or multiple addresses in a third. Each gets its own budget, its own landing page and its own definition of a good outcome.
The permit angle matters because it predicts the work. A job that needs a permit pulled in a small county municipality carries scheduling cost that a screen replacement does not, and blending them into one campaign means the cheap clicks starve the profitable ones.
Once the split exists you can finally answer the question owners actually ask: which of these three is worth more money next month.