If you register with the Update Service, you are less likely to need to complete a new DBS application again.
This registration service costs the following:
Non-volunteer DBS - £13 per year
Volunteer DBS - Free
If you need to keep your DBS current for over 3 years then this is a cheaper option in comparison to reapplying for a new one.
For further information on the Update Service, please visit the Government website.