Sentencing guidelines for domestic burglary are quite complex as there is a wide range of seriousness. If you are so inclined you can read them here:
http://sentencingcouncil.judiciary.gov.uk/docs/Burglary_Definitive_Guideline_web_final.pdf
Note that the features in the guidelines which help the court determine seriousness are NOT exhaustive and there may be other features present which will influence the sentence. It is the job of the prosecutor to highlight anything he thinks the court should hear.
You will see that if the burglary reaches “category 2” there is a fair chance that the miscreant will receive a custodial sentence. However, bear in mind that even if the custody threshold is passed, a “suspended” prison sentence is often imposed for a first time offender, particularly if he pleads Guilty.
If you do attend (assuming a guilty plea is entered) you will hear the prosecutor provide detailed facts of the case to the court and the defendant’s advocate speak on his behalf before the court announces its sentence. Also bear in mind that the case will probably be listed for either 10am or 2pm and you may have to wait some time before the case is called on. You can sit in the public gallery for the entire session (and so see other matters the court is dealing with) but make sure you sit in the right court as most court houses have more than one courtroom.