Generally a new driveway or patio area does not require building regulations approval.
However, you will need to make sure that any alterations do not make access to the dwelling any less satisfactory than it was before. So, for example, changing levels to introduce steps where none existed before would be a contravention of the regulations.
A planning consultant may help with the smooth running of your project. To find an accurate consultancy quote, explore Studio Charrette's calculators.
General guidance on the performance expected of materials and building work in order to comply with the building regulations and practical examples and solutions on how to achieve compliance for some of the more common building situations can be found in the approved documents section.