The Cussins House

The Cussins house is a post-war system-built property manufactured by Cussins Ltd and constructed between 1945 and 1946. These houses were developed during the period of acute housing shortage that followed the Second World War, when rapid construction methods were being used to provide homes for returning soldiers and their families.

Approximately 3,500 Cussins houses were built, mainly in suburban areas across the UK. They are also known as Cornes, Cornes Cussins, and Cussins Cornes. The design reflects both the urgency of the post-war building programme and the material limitations of the time.

A Cussins house showing the typical post-war semi-detached form associated with this system-built construction.

Cussins houses are typically two-storey semi-detached properties with a medium pitch gable roof. Roof coverings are usually clay pantiles or interlocking concrete tiles. Variation in window sizes is a common identifying feature, and a single-storey brick outhouse is often attached to the gable wall. A flat canopy commonly covers the front door.

The substructure consists of concrete strip footings with a brick-faced reinforced concrete edge beam and a damp-proof course. The main frame includes nine double RSC stanchions forming hollow box sections, twelve RSJ perimeter beams, six RSJ floor and ceiling support beams, one RSJ trimmer beam, and RSC horizontal and vertical secondary framing. Kariscol joints are used to connect the frame members. The primary frame was coated with red oxide paint, while the secondary frame was coated with black bituminous paint.

External walls may be formed in clay-slip-faced PRC panels laid in an unbonded pattern, rendered PRC panels, or brick throughout depending on the variant. The PRC panels are tied back to mild steel bars, creating a cavity filled with woodwool slabs for insulation. The separating wall between the semi-detached units is generally a 9-inch brick wall, while internal partitions are timber stud lined with plasterboard.

Ground floors are formed in asphalt on concrete, and first floors are tongue-and-groove boarding on timber joists. Ceilings are plasterboard. Roof structures include timber rafters, bituminous felt, timber battens, and tile coverings, with some examples finished in clay pantiles and others in interlocking concrete tiles.

The principal risks in a Cussins house relate to corrosion, structural movement within panelled elements, and long-term moisture ingress. Minor corrosion is known to occur within the hollow box RSC stanchions, particularly at their bases and below damp-proof course level. RSJ ground floor beams and RSC secondary framing can also show superficial corrosion. In addition, corrosion may affect reinforcement within PRC panels together with restraining hooks, rods, and spacers.

This was evident in the original design approach, where steel and precast elements work together and deterioration in one part can affect the performance of another. Displacement of PRC panels, cracking to mortar joints between panels, cracking in brickwork, and detachment of render are all recognised defects in this form of construction. Where these issues are advanced, they can affect weather resistance and raise wider structural concerns.

Moisture ingress and dampness are also important inspection priorities. The original damp-proof course may no longer perform effectively, and the woodwool slab insulation within the cavity may have degraded with age. In practice, that combination can contribute to rising damp, general moisture retention, and reduced thermal performance.

Roof coverings should be checked carefully for damaged, missing, or worn clay pantiles or interlocking concrete tiles. The flat canopy over the front door also warrants attention, as deterioration here can provide a localised route for water ingress. The attached single-storey brick outhouse should be inspected for structural movement, dampness, and signs of neglect, as defects here are often overlooked but can still affect the overall condition picture.

Internally, inspection should focus on the condition of the concrete footings and reinforced concrete edge beam where visible, the steel frame elements, the asphalt and concrete ground floor, the first-floor timber joists and boarding, the separating wall, internal partitions, plasterboard ceilings, and the roof structure. Additional checks commonly include moisture readings in walls, floors, and ceilings, together with a review of plumbing, electrical, and heating installations.

A Cussins house is a distinctive post-war system-built property, and its suitability depends heavily on condition rather than appearance alone. These houses can retain their utility and character, but they need to be assessed with a clear understanding of their steel-framed and panelled construction.

This is a common issue in properties of this type: defects are often concentrated in specific areas such as stanchion bases, panel joints, render finishes, and moisture-prone locations rather than being evenly distributed throughout the building. A purchaser needs to be comfortable with the possibility of targeted repairs, further investigation, and ongoing maintenance where original elements remain in place.

The practical question is whether the property has been maintained well and whether any corrosion, cracking, displacement, or dampness has already progressed to a point where more substantial works are needed.

Mortgage and resale considerations for Cussins houses are influenced by the construction type, visible condition, and the extent to which defects have been identified and addressed. Corrosion within steel components, movement in PRC panels, cracking to external walls, and unresolved dampness are all matters likely to affect confidence in the building’s condition.

A clear survey assessment is important where there is evidence of frame corrosion, panel displacement, render failure, or moisture ingress. Equally, a well-maintained example with defects understood and properly managed will usually present a clearer condition profile than one where repairs have been deferred or concealed.

A building survey provides an informed assessment of the visible condition and construction of a Cussins house. Inspections are non-intrusive and limited to areas that are accessible at the time of inspection.

• Identify visible corrosion to accessible steel frame components including stanchion bases and secondary framing
• Assess cracking, displacement, and deterioration to PRC panels, render, brickwork, and mortar joints
• Comment on roof coverings, the front canopy, external envelope condition, and signs of water ingress
• Review the general condition of accessible floors, ceilings, partitions, and roof structure
• Highlight dampness, insulation concerns, and defects that may require repair, monitoring, or further investigation

However, there are limitations to what a survey can determine without intrusive investigation.

• Confirm the condition of concealed steel members, fixings, rods, restraining hooks, or spacers within enclosed construction
• Assess hidden structural elements behind finishes, linings, or built-in coverings
• Determine the full extent of corrosion within PRC panels or concealed cavities containing woodwool slabs
• Inspect areas that are inaccessible or covered at the time of inspection

Where higher-risk indicators are identified, further specialist or intrusive investigation may be recommended.

For a thorough building survey in Greater London, an instant quotation can be obtained through the online survey calculator.