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Ever looked on CountyAsylums.com or in people reports and wondered what a radial, corridor or pavillion plan are? I know I have, and there seens to be little explanation to what they are on the internet, unless you are god at visualising what peoples words are lol...Credit is due to Pete as he is the man that is in the know about all this and helped with some of the classifications - although I am sure he may comment on my choice 
Anyway,from what I gather, there are five main types: Initially catergorised by Sir Henry Burdett and then expanded by Hine at a later date.
Radial Plan
The Radial Plan saw the long wings of the Asylum radiate outwards from a central point, thus reflecting the style of prisons of that era. This style was considered inhumane even in its day due to the lack of natural light, circulation of air and space for airing courts. It was only really implemented in the south east and there were only two examples built.
Corridor Plan
The Corridor Plan was a long running style of Asylum layout primarily used between 1830 and 1890; they are laid out with the administration block at the centre of the site with the wards flanking it on either side. This allowed for the easy segregation of the sexes and it also aided in the ease of communication throughout the Asylum. This layout varies throughout its lifetime, some buildings such as Stone House has the wards based around the main corridor and followed a linear layout. Others such as St Johns, did not follow such a linear corridor and instead it spread around the central services.
Pavilion Plan
The Pavilion Plan saw the asylum laid out in a detached of semi-detached block formation. There were three main types of the pavilion layout, they were:
Standard Pavilion
The pavilion plan consisted of a long linear corridor extending either side of the administration block, the ward blocks were orientated perpendicular to the corridor and attached at their ends; the stores/water tower could located centrally or remotely. There were only a few of these examples built around the country, but Hellesdon Hospital & the Annexe at Lancaster Moor resemble how the layout would have looked.
Dual Pavilion
The Dual Pavilion consisted of the administration and services blocks flanked by long corridors, which in turn were flanked by the ward blocks. This design was intended to make the segregation of difficult cases easy; however due to the large size it made their operation difficult.
Radial Pavilion
This was a rare layout for an asylum, it was the intermediate between the Pavilion plan and the Echelon plan; it consisted of a semi-circular corridor with the blocks on the outside and the services in the middle. There were only two examples of this type of asylum built through the country.
Echelon Plan
The Echelon plan superseded the Pavilion Plan around 1880; it rose in popularity due to the arrangement of the wards, offices and services which were all off of a large corridor. There were two main type:
Broad Arrow
This was the earlier form of the echelon plan, it consisted of all the services and wards being spread out across a large site. It was essentially a set up of the pavilion blocks interconnect with short corridors which came off a larger main corridor. There were only two examples of this layout being built, with only one reaching full completion, High Royds in Menston - which predates the layout at Claybury by three years.
Compact Arrow
This was the plan that revolutionised the design and construction of asylums throughout the UK as it was the most practicable type; it led GT Hine to become the most accomplished of all the asylum architects. Its design kept the long corridors of the Broad Arrow plan, but the wards were moved closer to it, removing the shorter unnecessary corridors; the services were still central to the asylum site. It also gave the asylum a light and airy feel to it, which was important to the Mental Health regime. There were two types of the Compact Arrow plan, one where the wards where set away from the corridors as Pavilion type ward blocks. The other was where the wards were all conjoined, to form one large building - this allowed for staff to move very quickly through the buildings - the differences can be seen below. Later examples of the Compact Arrow plan also included villas on the outskirts of the asylum for epileptic and chronic cases; this led to the further development of the colony layout with open corridors.
Colony Plan
The Colony Plan consists of the blocks being dispersed around the asylum without the traditional long corridor connecting them; the administration and services buildings were still placed at the centre of the complex; they weren't used for major asylums. Later complexes such as West Park in Epsom implemented a colony layout but with echelon principles. One such examples is St Ebbas, Epsom
S8
Anyway,from what I gather, there are five main types: Initially catergorised by Sir Henry Burdett and then expanded by Hine at a later date.
Radial Plan
The Radial Plan saw the long wings of the Asylum radiate outwards from a central point, thus reflecting the style of prisons of that era. This style was considered inhumane even in its day due to the lack of natural light, circulation of air and space for airing courts. It was only really implemented in the south east and there were only two examples built.
St Lawerences, Bodmin (original building)
Devon County Pauper Lunatic Asylum, Exeter
Devon County Pauper Lunatic Asylum, Exeter
Corridor Plan
The Corridor Plan was a long running style of Asylum layout primarily used between 1830 and 1890; they are laid out with the administration block at the centre of the site with the wards flanking it on either side. This allowed for the easy segregation of the sexes and it also aided in the ease of communication throughout the Asylum. This layout varies throughout its lifetime, some buildings such as Stone House has the wards based around the main corridor and followed a linear layout. Others such as St Johns, did not follow such a linear corridor and instead it spread around the central services.
City of London Asylum, Stone House, Kent
St Johns Asylum, Lincoln
St Johns Asylum, Lincoln
Pavilion Plan
The Pavilion Plan saw the asylum laid out in a detached of semi-detached block formation. There were three main types of the pavilion layout, they were:
Standard Pavilion
The pavilion plan consisted of a long linear corridor extending either side of the administration block, the ward blocks were orientated perpendicular to the corridor and attached at their ends; the stores/water tower could located centrally or remotely. There were only a few of these examples built around the country, but Hellesdon Hospital & the Annexe at Lancaster Moor resemble how the layout would have looked.
Hellesdon Hospital, Norwich
Lancaster Moore Annexe, Lancaster
Lancaster Moore Annexe, Lancaster
Dual Pavilion
The Dual Pavilion consisted of the administration and services blocks flanked by long corridors, which in turn were flanked by the ward blocks. This design was intended to make the segregation of difficult cases easy; however due to the large size it made their operation difficult.
Whalley Asylum, Calderstones
St James Hospital, Portsmouth
St James Hospital, Portsmouth
Radial Pavilion
This was a rare layout for an asylum, it was the intermediate between the Pavilion plan and the Echelon plan; it consisted of a semi-circular corridor with the blocks on the outside and the services in the middle. There were only two examples of this type of asylum built through the country.
Cane Hill Hospital, Coulsdon
St Luke's, Whittington Hospital
St Luke's, Whittington Hospital
Echelon Plan
The Echelon plan superseded the Pavilion Plan around 1880; it rose in popularity due to the arrangement of the wards, offices and services which were all off of a large corridor. There were two main type:
Broad Arrow
This was the earlier form of the echelon plan, it consisted of all the services and wards being spread out across a large site. It was essentially a set up of the pavilion blocks interconnect with short corridors which came off a larger main corridor. There were only two examples of this layout being built, with only one reaching full completion, High Royds in Menston - which predates the layout at Claybury by three years.
High Royds Hospital, Menston
Compact Arrow
This was the plan that revolutionised the design and construction of asylums throughout the UK as it was the most practicable type; it led GT Hine to become the most accomplished of all the asylum architects. Its design kept the long corridors of the Broad Arrow plan, but the wards were moved closer to it, removing the shorter unnecessary corridors; the services were still central to the asylum site. It also gave the asylum a light and airy feel to it, which was important to the Mental Health regime. There were two types of the Compact Arrow plan, one where the wards where set away from the corridors as Pavilion type ward blocks. The other was where the wards were all conjoined, to form one large building - this allowed for staff to move very quickly through the buildings - the differences can be seen below. Later examples of the Compact Arrow plan also included villas on the outskirts of the asylum for epileptic and chronic cases; this led to the further development of the colony layout with open corridors.
Goodmayes Hospital, West Ham
Severalls Hospital, Colchester*
Severalls Hospital, Colchester*
Colony Plan
The Colony Plan consists of the blocks being dispersed around the asylum without the traditional long corridor connecting them; the administration and services buildings were still placed at the centre of the complex; they weren't used for major asylums. Later complexes such as West Park in Epsom implemented a colony layout but with echelon principles. One such examples is St Ebbas, Epsom
St Ebba's Colony, Epsom
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