Published by John Gillen | Last updated: 19th December 2023 | All Sources

Homed within a grade II listed building, with a significant historical presence, Cassiobury Court is now a rehabilitation centre, specialising in drug and alcohol addiction recovery.

Boasting historical development, the once Cassiobury House which was later demolished has stood over the years within the community, remaining today as the stables which facilitate the professional and private centre that it is.

cassiobury court gardensAvailable to offer treatments and therapies surrounding safe, clinical, and holistic addiction recovery, our quality and regulation of Care Quality Commission (CQC) standards support our reputation.

Our history is highly unique, dating back to the archives of Herefordshire in 1331, to today in the 21st century, offering respite, direction and purpose-driven services of drug and alcohol rehab.


Keep reading to see how our history has developed into our current offering, here to guide you, your loved ones and all individuals affected through addiction.


Our History As Cassiobury Court

Our history dates back to 1331, where the structure of Cassiobury Court began. Here’s a timeline of history, to today as our rehabilitation centre.

The Hundred of Cashio

The Manor of Cashio, known as Albanestou during the Domesday Survey has historically been referred to by other titles such as St Albans Hundred and the Hundred of Cashio. It included a number of parishes such as Abbots Langley, Chipping Barnet, East Barnet, Bramfield, Codicote, Elstree, Hexton, Newnham, Northaw, Norton, Redbourn, Rickmansworth, Ridge, St. Michaels, St. Paul’s Walden, St. Peter’s, St. Stephen’s, Sandridge, Sarrat, Shephall, City of St. Albans and of course, Watford [1].

The Manor of Cashio
Survey of the Manor of Cashio 1331-1332 from the Hertfordshire Archives

During the Dissolution of the Monasteries ordered by King Henry VIII in 1539 Cashio and Watford had been divided, and Henry was made lord of the manor of Cassiobury. Seven years later, he granted these privileges to Sir Richard Morrison, propagandist to Henry VIII and protégé of Thomas Cromwell, the first Earl of Essex.

Sir Richard began building Cassiobury House in 1546, but the progress of the property was extremely slow and was still unfinished when he went into exile abroad in 1553, then later dying in 1556. The construction of Cassiobury House was continued by Sir Richard’s son, Sir Charles who completed Cassiobury House in the same year of his father’s death. Sir Charles passed in 1599 and was then succeeded by his son Sir Charles Morrison 1st Baronet who was further succeeded by his daughter Elizabeth Morrison.

In 1627 Elizabeth Morrison married Arthur Capel, and naturally, the estate came under the ownership of the Capel family [2].


Capell Ownership, A New Era

Politician and supporter of the Royalist movement during the English Civil War, Arthur Capel was sentenced to death in 1649 by parliamentarians and beheaded. As part of his last request, Arthur famously asked for his heart to be taken from his body and placed in a silver box at the feet of Charles I, however many years later it was discovered that this did not come true. The silver box was discovered 60 years later in the family vault.

Following the death of Arthur, Cassiobury House had changed hands after its sequestration by parliament, however, it wasn’t long before the grounds were back under Capell ownership. Lady Elizabeth Capel had successfully petitioned parliament for Cassiobury and she gained back full control of the estate in May of the same year.

Cassiobury House Staircase

The main staircase of the property, which some still attribute to Gibbons although many believe that Edward Pearce was in fact the creator.

Elizabeth’s son, also named Sir Arthur Capel, then inherited the estate. Under Arthur’s ownership, Cassiobury House went through its biggest transformation yet. He employed world-famous craftsmen to undertake work at the property including Architect; Hugh May, Wood Carver Grinling Gibbons and Painter; Antonio Verrio.

Arthur would be implicated in the Rye House plot which aimed to overthrow King Charles II and in 1683 he was imprisoned in the famous Tower of London and somewhat coincidentally held in the same cell as his father was placed prior to his death. Arthur was found dead in this cell with his throat cut before he could be sentenced. Today there are still questions surrounding whether he was murdered or committed suicide as a noble gesture to his family.

The estate also contained luscious gardens with a plethora of fruiting trees including almost 300 lime trees. The gardens were constructed by Moses Cook who also developed woodland pathways [3].

During the late 1700s and early 1800s, Cassiobury House added an Orangery and a Gothic exterior which was commissioned by James Wyatt. The property Had a vast array of paintings, and its gardens were considered the “most complete in England” by Frances Calvert. In the late 18th century Humphry Repton completed landscaping on the park and commissioned several lodges which were designed by Sir Jeffery Wyattville. Cassiobury Lodge still remains today.

The Cassiobury estate remained with the Capel family for generations, however, during the early 20th century the house was no longer in a habitable state and subsequently sold off. The property was demolished in 1927, and today only the stables, which are today known as Cassiobury Court remain.


Development Of The Rehab, Cassiobury Court

Cassiobury Court is a grade II listed building and the former stable block to Cassiobury House. As an outhouse, Cassiobury Court luckily survived the demolition of Cassiobury House in 1927 and of the Cassiobury estate is the most substantial surviving remnant of all of the estate buildings that are related to Cassiobury House.

Scattered across Cassiobury park are reminders of the old country house that once was, with fragments of the original garden wall, the house cellars and some of the original building materials and chimneys with some elements incorporated into nearby houses such as the below gateway.

Cassiobury Court Outside

Within the Cassiobury estate, there are a number of lodges and dower houses remaining. The dower houses include Russell’s House and Little Cassiobury and the estate lodges are comprised of Cassiobridge Lodge, Tollgate Lodge and Garden Cottage and like Cassiobury Court are all listed buildings.

Since its use as a stables, Cassiobury Court has had many alternative uses over the years. In the 1930s the building was used as a riding school and then later in the 1950’s it was used as an old people’s home. Today, Cassiobury Court is being used as a rehabilitation centre to help overcome addiction. Cassiobury Court had originally been believed to have dated around 1805-1815, however following technical analysis in 2010 on the building as part of the Historic Building Appraisal, it is suggested that the core of the building has much earlier origins, between 1680 and 1730.

Cassiobury Court is now operated by Step One Recovery; a company dedicated to providing a collection of excellent treatment and rehabilitation centres across the UK.

black triangle  Get In Touch

Are you suffering from an Addiction and need help? If so, Cassiobury Court are leading UK based experts in Drug and Alcohol Addiction Treatments. Find out how we can help by getting in touch with our friendly team today. You can either call our confidential helpline or request a callback by clicking on the below form.

Contact Us


Exclusive Private Drug and Alcohol Rehab

Our history has developed significantly over time, to help us reach a point of specialism through our now offering of drug rehab and alcohol rehabilitation. Recognised as a private rehabilitation centre, we offer an efficient admissions process into the careful hands of our dedicated team of specialists, making use of leading recovery treatments and therapies.

Our mission is to work mutually with our clients and their loved ones, to rehabilitate, to develop and to change the future, to become free from drugs and alcohol. Through our comfortably designed rehab clinic, our exceptional care, our CQC standards and our comprehensive offerings of rehab, our services are a vital instrument within addiction recovery.


With years of experience, rehab outcomes are positive, are life-changing and are sustainable through our treatment programmes, making long-term recovery a viable goal.


Addiction Treatments and Therapies

Available to help people from all backgrounds, experiences with drugs and alcohol, and outlooks, we offer a range of addiction treatment and therapy options. Recommended to cater to personal needs and circumstances, addiction treatment services work to treat symptoms, causes, and outcomes of addiction.

Indefinitely promoting withdrawal and restoration, the likes of alcohol detoxrelapse prevention, cognitive behavioural therapy (CBT), dialectical behavioural therapy (DBT), dual diagnosis treatment, and individual therapy are advocates. Alongside inpatient addiction treatment, care also focuses on family drug support, post-rehab planning and aftercare to finalise and sustain recovery.


Reliable Quality and Regulation

Our passion to offer instrumental care ensures that our quality and regulation are both reliable across our services, facilities, and values. Reliability is found across the board, meeting the standards of the Care Quality Commission (CQC) when considering the quality of support, treatment and safety that’s offered.

Drug and Alcohol Rehab - Cassiobury Court

Feeling safe and assured with what’s ahead through our professionalism, our safe treatments and therapies and our private setting will be expected here at Cassiobury Court.


It’s evident that through our history, our setting has homed many roles and images. Yet today, Cassiobury Court as a rehabilitation centre is the most beneficial and purpose-driven. For support throughout addiction recovery, we are here for you, offering direct access to rehab. Reach out to experience our offering of drug and alcohol rehabilitation.

Addiction is the most treated condition from our facility, with a focus on drug and alcohol abuse. We do however offer treatment through the likes of gambling addiction, providing help through the physical and psychological struggles. Mental health issues can also be treated here in unison, through our dual diagnosis treatment programmes.

Therapies and treatments vary all depending on the nature of the diagnosis. Physical and psychological forms are prevalent, including detoxification, talking therapy, relapse prevention and aftercare.

The cost of rehab will be based on the length and degree of support that’s available. Found to offer value for money, we can cater to personal budgets, to make rehab accessible.

John Gillen

John Gillen - Author Last updated: 19th December 2023

John Gillen is a leading addiction treatment expert with over 15 years of experience providing evidence-based treatment methods for individuals throughout the UK. John also co-authors the book, The Secret Disease of Addiction, which delves into how the addictive mind works and what treatment techniques work best.