So what is a property of non traditional construction?

Well, firstly, to answer the the non traditional construction question, let’s consider what are ‘standard’ or ‘traditionally constructed’ properties. These are usually defined as being built of:

  • Bricks and mortar with either a slate or tiled roof
  • Stone construction having either a slate or tiled roof

Cross section of traditional construction, showing brick external facing, cavity insulation and internal Blockwork

Cross section of traditional build construction


So non traditional construction is a house that isn’t built of brick or stone, such as concrete house constructions, PRC houses (pre-cast reinforced constructions), and timber-framed properties.

There are more types of construction in the UK than in almost any other country in the
world with around a million non standard construction homes with the BRE (Building Research Establishment) listing over 500 different system builds between 1919 and 1976 and the number of different types is growing. The house building industry is changing yet again.

Market forces, government agendas, planning policy and building regulations are forcing the industry to reconsider the way houses are built. This is not something new, nearly all non-standard homes in the UK have been built to meet a specific need – typically rapid construction of high volumes of cheap housing. In most cases they were only ever intended for short-term occupancy although many are still lived in years after their shelf life. These non standard construction properties can be problematic when it comes to mortgage lending and quite often we find that sellers of non traditional construction houses are forced to either sell cheaper than standard housing on the same street or face waiting for a cash buyer.

Lending on non traditional construction

For lenders the issue is not only the new construction types but also the old ones which may not have performed as well as was intended. In tough market conditions with low or negative price growth in stagnant or falling markets, mortgage lenders are risk averse and will look for reasons to decline a mortgage application. An easy target is any property that falls into the non-standard bracket such as concrete and steel framed, timber framed, pre-fabricated, pre-cast, cast iron, clad systems and such. The bulk of these non-standard homes were built post-war to replace lost housing, facing materials shortages, lack of skilled labourers and lack of cash forced builders to construct vast volumes of low cost easy-build homes as quickly and cheaply as possible. Only now years down the line do the short comings and unique issues arise with certain types of non-standard build, these issues range from minor maintenance programmes, through to problems with damp, to major structural defects that require demolition or partial remediation and re-building.

It’s easy to see why some buyers would not touch a non-standard home with the proverbial barge pole and even easier to see why some lenders refuse to lend mortgages against them.

Performance of non-traditional housing

Although age, wear, lack of maintenance and misuse take their toll and make buildings look rather poor, many non-traditional housing systems initially provided quite pleasant looking homes and a good number remain so. In general, most non-traditional housing systems have performed well from a structural point of view, although some problems developed with a number of system -built dwellings. By the 1980’s some fundamental problems affecting structural stability and durability began to emerge in some of the concrete system built houses. The problems occurred because of either carbonation or the presence of chlorides in the concrete and resulted in the corrosion of steel reinforcement and subsequent cracking and spalling of the concrete.

The problems of carbonation and the presence of detrimental chloride levels in reinforced concrete dwellings led to certain concrete housing systems being designated defective under the 1984 Housing Defects Legislation, which was then incorporated into the Housing Act of 1985. A company named PRC Homes Ltd (a subsidiary of NHBC) was set up to license repair schemes for housing systems designated as defective under the act. The extent of works and costs involved in some of these repairs was very substantial. No steel or timber systems were designated as defective.

Condition surveys undertaken by BRE in the 1980s and early 1990s, revealed serious corrosion to parts of the steel frame to some steel framed houses in certain locations. Corrosion was particularly common on the lower sections of stanchions and sometimes around window and door openings. The corrosion was such that on some occasions the replacement of lower sections of the stanchions was necessary. However, many steel houses remain in good condition.

Factors to account for if you are buying a non standard property;
  1. Check with your mortgage lender before you have a survey
  2. Get insurance quotes
  3. Think of re-sale values and how long it may take to sell on
  4. Maintenance and repairs – these could be more costly and more frequent
  5. Extensions and home improvements – again may be more complicated or not possible

If you are looking for more information on the structure of your home a good place to start is