The government has announced GBP740m of funding to increase the number of places for pupils with special educational needs and disabilities (Send) in mainstream schools in England.
The money, part of the GBP6.7bn of education spending announced in the Budget, will be targeted towards adapting school buildings to make them more accessible.
In October, the National Audit Office (NAO) said parents had lost faith in a Send system "in urgent need of reform".
Education Secretary Bridget Phillipson told BBC News she "hears the frustration" of parents but significant changes would take time.
BBC News analysis suggests the number of Send pupils in mainstream education in England has increased by a third since the 2015-16 academic year.
At Brighouse High School, in West Yorkshire, head teacher Richard Horsfield worries about not having enough funding to support pupils with Send - in terms of both educational support and capital spending on the school building.
The school supports them well - but more money is needed.
Over the summer holidays, the school spent about GBP10,000 on building adaptations, such as handrails and accessible bathrooms, for incoming students, making a "big dent" in its budget.
But the school lift remains broken and would cost about GBP250,000 to fix, which there is "absolutely no way" the school can afford.
And this means one wheelchair-using pupil has to go outside and through car parks to reach some classrooms.
"On wet December mornings, it's just not good enough," Mr Horsfield says.
But he still believes most children with Send should be in mainstream schools and sees them "flourishing" when they have the right support.
"We should be supported to do that at a level that we want to do that at," Mr Horsfield says.
"We are being constrained at the moment, due to the lack of funding and lack of resources."
Over the past few years, the number of learning support assistants at the school has nearly halved and fewer pupils are able to access specialist counselling from outside services.
But the school still provides specialist workshops for those needing extra support, both for academic lessons and social, emotional and mental health.
Source: BBC