A Disabled Facilities Grant is a council grant that pays for home adaptations for a disabled person, such as ramps, stairlifts and level-access showers. The maximum is GBP 30,000 in England and GBP 36,000 in Wales. It is means-tested for adults but not for a disabled child, and it does not affect your benefits.
What it pays for - Home adaptations: ramps, grab rails, stairlifts, level-access showers, widened...
Maximum (England) - GBP 30,000
Maximum (Wales) - GBP 36,000
Northern Ireland - Up to GBP 35,000 (more in some cases), through the Housing Executive
Plus 4 more in the full guide

freedomisntfree.co.uk/guides/disabled-facilities-grant