Integrated solar panels are cheaper than roof tiles if re-roofing. I imagine most "big" house builders aren't savvy enough from a financial perspective to have figured this out.
My roof is only 10 years old, but when the time comes I'll get it done with solar tiles. Right now it just has 12 panels in an E/W configuration driving a 3.7kW inverter and 5.2kWh of batteries. Not quite enough to get through the day in Dec/Jan, but from February onwards it'll deliver a full charge.
From April onwards it provides sufficient electricity to shut down the oil boiler and rely on the immersion heaters and electric fire while topping off the car.
I do get quite resentful about the original FIT schemes as they should never have existed, and realistically should be scrapped now and the payments returned to the standard 4.1p, with the excess redirected towards people who genuinely can't afford utilities at today's prices.
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