They withdrew from the professional system when their licence was purchased by Eric Perez and permission was granted by the RFL to relocate it, this would ultimately lead to Cornwall R.L.F.C.

After a series of friendly fixtures during summer 1981, the club was formally constituted and joined the Second Division of the South Amateur Rugby League.

In 1994, Hemel played London Broncos in the Regal Trophy, leading 18–6 at half-time only to succumb in the final 10 minutes.

The club's playing depth that day was emphasised when, in the curtain-raiser, its reserves won the Southern Counties Cup against the all-Kiwi South London Warriors.

Although the club lost all of its games in the first season, it progressed steadily and made the 2006 Grand Final under new coach Troy Perkins, losing to Bramley Buffaloes.

Hemel finished in second place in the 2006 league table and qualified for the playoffs for the Grand Final, where they lost to Bramley Buffaloes by 30 points to 8.

Hemel Stags beat Huddersfield Underbank Rangers 17–10 in the National Conference League Division 3 Grand Final on 29 September 2012.

In the first campaign as a professional team, Hemel Stags finished fifth in the Kingstone Press Championship 1 claiming a play-off place.

After defeating Oxford RLFC 30-26 at the Pennine Way Stadium in the first round, Hemel left the competition following a 28-44 loss away to London Skolars.

[3] On 20 May 2019, the semi-pro franchise of the club was granted approval to relocate to Ottawa, Ontario, Canada, where it was intended will play at TD Place Stadium beginning in 2021.