The sequence and design of the lock houses built by the  Lee Conservancy can be confusing.  Perhaps this page will help you sort it out!

First of all - sequence....

1860    Stonebridge Lock.  Demolished 1961 to make way for second lock chamber. Replaced by British Waterways house on west bank

1876    Hardmead Lock. Extant. Much altered and extended

1877    Rammey Marsh Lock. Demolished and replaced by modern building (date not known)

1878    Dobbs Weir Lock.   Demolished February 1977.  New house built by British Waterways in 1976.

1878    Feildes Weir Lock. Extant. Almost original

1878    Hertford Lock.  Extant. Now extended to rear.

1878    The three houses and two offices at Limehouse Lock. Extant. Interior much altered.

1878    Picketts Lock. Demolished and replaced with bungalow by British Waterways (date not known)

1878    Ponders End Lock.  Demolished 1959 to make way for second lock chamber. Replaced by British Waterways house,     now also demolished.

1878    Waltham Town Lock. Extant in original position of lock, south of Highbridge Street.

1881    Tottenham Lock. Demolished 1960 to make way for second lock chamber. Replaced by British Waterways house.

1886    Kings Weir.  Extant. Extended on east and south sides

1886    Ware Weir.  Extant.

1889    Enfield Lock. Collector's House.  Extant

          (No date discovered for the Lock keeper's house which is also extant, possibly pre-1878)

1893    Waltham Common Lock.  Extant.

1895    Aqueduct Lock.  Burnt down 1975. Not replaced. 

1899    Stanstead Lock.  Extant.

1909    Cheshunt Lock. Burnt down and demolished after 1975.  Not replaced

1936    Carthagena Lock.  Extant, much enlarged.

And now - design....

Stonebridge Lock house (1860) was a unique design

LMA ACC 2423/P906

Although Hardmead Lock house, built in 1876, had the external appearance of the later 1878 design, the internal layout was different, with a central staircase rising from 3 feet inside the front door, effectively dividing the house in two.

Rammey Marsh Lock house (1877) also had this central staircase.

LMA ACC 2423/026

The most popular design (1878) was  used at seven locks. The staircase in these houses climbed transversely up the back wall, some from the right hand side and some from the left. It seems to depend which side of the Navigation the house was built. Hertford and Feildes Weir (on the east bank) are both right handed whereas Dobbs Weir, Tottenham, Waltham Town were/are left handed.  The long-gone houses at Picketts and Ponders End, also on the western side were almost certainly left handed as well.

LMA ACC 2423/P016

Kings Weir and Ware Weir (1886) both used the same design

LMA ACC 2423/P025

The Waltham Common house (1893) and that at Stanstead Lock (1899) used the same set of drawings with "Stanstead"  pasted over "Waltham Common.

LMA ACC 2423/P044

    Aqueduct Lock (1895) - there are no  plans of the house here except the outline on the 1922 lock rebuilding drawing. This shows that the building here was probably built to the same design as Waltham Common and Stanstead

Cheshunt lock house (1909) seemed to incorporate bits of most of the previous designs

LMA ACC 2423/P40

Whereas Carthagena lock house (1936) was, unsurprisingly, a new layout altogether.

LMA ACC 2423/P2674