mybusinessrates.gov.uk/wales the official government website
Working from home, renting out a holiday home or providing bed and breakfast - you may have to pay business rates on your property
Understanding summary valuations
Every five years the rateable values of all 1.75 million business properties in Wales and England are reassessed. The most recent revaluation came into effect on 1 April 2005. Many ratepayers received details of their proposed new rateable value in the form of a summary valuation.
more...
Changing your existing building
The rateable value for your business is based upon its rental value. This will be affected by, among other things, the amount of space that you occupy and what you use it for. If you make changes to the building your business is in, for example modifying the structure, building an extension or changing the way that you actually use the space, your rateable value can be affected.
If you would like advice on how any changes may affect your rateable value before you implement them you can contact your local Valuation Office. You can also look up rateable values online if you want to compare with other properties in your area.