yeah, ur budget is a little low. We r doing for a 4rm resale (84sqm) and found that the usual 4rm package offered is ar 20k to 25k oredi. The package usually include the basic works for resale such as demolition works, masonry & flooring works, plumbing works, some ceiling works, painting works, 20ft kitchen cabinet (top & bottom) and miscellaneous such as haulage, clearing of debris. The price exclude the wiring (which is ar $3k - estimated by ID), the windows, grilles and door works can come up to ar $3k to $4k for the whole house. Yours is so much bigger, so might need to up your budget, if not drop some of the works. All the best.