How business rates valuations are calculated

Business rates: valuing alterations to existing properties


If you alter your property, you must let Land & Property Services (LPS) know, as this can affect your rate bill. The most common alterations to properties include:

  • extending a property
  • sub-dividing property
  • demolishing part of a property

Changes to the Net Annual Value (NAV) of non-domestic or business properties, which are assessed on their rental value, take effect from the date that the works were completed.

You can find your NAV on your rate bill or you can use the link below to check the NAV of any non-domestic property in Northern Ireland. You can also use this link to make an online submission to have your valuation reviewed if your property has been altered or renovated or if you feel that your rate bill is not correct.

Online application form to have your property valuation revised.

To use the online submission, you should input your property information on the first page and click on the search button. This will then bring up the address, valuation etc. When you are satisfied that this is the correct property, you can then click on the submit query button and follow the instructions on the subsequent pages.

You can also check the Non-Domestic Valuation List on a map.

Informing Land & Property Services of alterations

If you make any alterations to your property you should advise LPS. You should do this by

The CR3 application form is a writable document, which means you can complete the form on-screen, print it off and send to your local LPS valuation office. Alternatively, you can save the document to your desktop, complete the form and send as an email attachment to your local valuation office. If you have any queries about having your property valued, you should contact your local LPS valuation office.

Find contact details for your local LPS valuation office.

Please note: Most LPS services are available, but LPS Customer Information Centres remain closed until further notice. The Ordnance Survey helpline remains closed until further notice, however queries can be directed to Helplines for rating and valuation, housing benefit, rates relief and land registration are open.

Closures will be kept under regular review in line with further Government announcements. Further information on service updates, helpline numbers and reaching LPS by email are available on the LPS website.