The NSW government's $3.5 million investment in the 122-year-old building means the number of children who can take part in hands-on history lessons has doubled.

Arts Minister Virginia Judge said the fit-out had been more than a year in the making, and offered an unforgettable experience.

``They will arrive here as 21st century school children and undergo an amazing transformation, changing into the uniforms from 120 years ago and immersing themselves in a school day in 1888,'' Ms Judge said.

``They will march up the hill to the schoolhouse to receive lessons exactly as they were given in 1888, complete with a rendition of God Save the Queen.

``They'll kiss the laptop goodbye and embrace the slate and inkwell and practise sewing, under the watchful eye of the schoolmistress.''

Riverstone MP John Aquilina said Rouse Hill Schoolhouse was a unique project no book or television program could replicate.

``I am so proud we have been a great supporter of developments at Rouse Hill House and Farm,'' Mr Aquilina said.

``This community has an extraordinary history, stretching right back to the earliest days of settlement, and an equally exciting future.''

Bookings are essential on 96276777.