The Attorney General was asked to review the sentence handed to a former soldier for murdering his neighbours as their children slept upstairs.
Collin Reeves (35), killed Jennifer and Stephen Chapple, Norton Fitzwarren in Somerset on 21 November after a long-running dispute over parking.
Reeves was sentenced to a life term with a minimum term 38 years.
The unduly lenient sentence plan will now consider the jail term.
Six times, Mrs Chapple (33), and Mr Chapple (36) were stabbed by the ex-Royal Engineer in their home.
Bristol Crown Court heard that he killed the couple with a ceremonial knife he received from the Army.
Reeves phoned the police to confess shortly after the murders, but later claimed he was guilty by diminished responsibility of manslaughter.
Reeves was found guilty of murder by Bristol Crown Court on the eighth day.
A spokesperson for Attorney General's Office stated that Collin Reeves' case was being considered under the Unduly Loving Sentence Scheme.
"Only one request is needed to determine if a sentence is too short.
"The Law Officers have 28-days from sentencing to review the case and decide whether to remand the sentence to Court of Appeal."
Judges will decide if the original sentence should remain or be amended if the case is referred by the Court of Appeal.
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