Problem properties: Non standard construction

feat. problem properties non stand

Trying to buy or sell non-standard construction properties can be tricky especially if you are not too sure what you should be looking out for.

What does non-standard construction mean?

When you think of the typical British building (of ‘traditional construction’) you are probably thinking of a quaint brick house with a tile roof or thereabout. Well, this would be considered a ‘standard construction‘ building and everything else is considered non-standard construction property.

concrete and glass building How to tell if my property is a non-traditional construction

If your property isn’t made from bricks and a tile/slate roof then chances are it’s a non-standard construction house but if we wanted to look more closely at what non standard materials are so, we made a split of common items from construction types to physical materials.

Generally, we split construction materials into two categories the roof and the walls or ‘frame’ of the house.

cottageCommon Non-standard construction materials used in walls/frames:

Asbestos – Popular between the 1950s-1980s it was a good insulation and fire-resistant martial that requires specialist removal.

Cob – It’s what you get when you mix clay, sand, straw, water and earth. Less common in the UK and a bit more common with ‘eco’ properties.

Concrete – Popular in post World War 2 ‘prefab’ houses when properties needed to be constructed quickly. They were not designed to last and there are still a lot around. It is also used in pre-cast reinforced concrete (PRC) or within a steel frame, it can be great for special articutcal requirements that other materials just don’t shape to. Concrete doesn’t last as well as brick and if it’s reinforced with steel beams/poles (or similar) they can corrode which can cause problems for older properties built out of concrete.


Corrugated iron Corrugated iron – A cheap option where the corrugations can give durability along the path with the corrugation, less common for walls but often used for roofing.




Glass partition Glass – Common for use in windows much less common for use in supporting structures or separating large spaces. Sometimes ‘space frames’ are used to cover very large areas. It can be used for roofing too to let in large amounts of light and is considered a non-standard construction material when used outside the scope of a window or door.



metal buildingMetal– More often used as a framing (like steel frames) material or a covering if correctly treated can work well but poses risks of weathering and corrosion. Less common in residential properties.

Wattle & Daub – Known to have dated back over 6,000 years it’s a very old building style and involved the use of woven wooden strips combined and then daubed with a sticky material (cob). Normally in old or historic/listed buildings, it has made a bit of a comeback as a renewable budling style. You might find a thatch roof with buildings of this style too.


timber houseTimber/Wood +Plaster – From a solid wood construction to wooden framed houses there are some variables. Older properties will be made of mainly wood. Newer buildings using a BSST (usually if they are newer than 1960’s) style system to build the property are considered standard.


Flint – First used with Romans and more commonly in the middle ages, it hit its stride in the 15th century when ‘flushwork’ was common. It had a bit of rerun in the 18th century and is now associated with more historic houses and is considered a non-standard construction material. You’ll see plenty of flint stone walls in historic towns, especially in the south of England where there are plenty of flint mines.

Stramit construction – Invented in Sweden in 1930’s used as a ‘panel’ system and is more associated with internal elements of walls/frames than outside.

Other – Really if you can think of it and make a house of it from plastic bricks to any other variable it’s most likely a non-standard property.

Common Non-standard construction materials used in roofs:

Roof tiles Whilst any of the wall/frame materials we’ve listed above could be used to construct a roof we’ve also listed other materials that are often used in non-standard roofs.

Flat roof – Whilst not a material it’s also not too common in the UK due to our climate and volume of rain and can cause issues with drainage. It was worthy of its own point but technically not material just a style of roof.

Asphalt – Not just used on roads it can be used as a roofing material, in the US it is used in a tile format but in the UK it is more common to be used for flat roofs. it is heavy, easy to repair and gives a matte finish though its can struggle with hot and cold weather.

Shingles – Used on sloped roofs where each row is nailed or secured just above the next to create an overlap. The roof tiles or strips can be made from a few materials and to different sizes and can be a cheap and easy way to secure a roof, more commonly used on your shed than a house though.

thatchThatches – using dry materials from straw to reeds it’s an older style of roof that’s good for insulation due to the air pockets trapped in the thatch though requires specialists maintenance and repair and due to the construction material isn’t the best against fireproofing!

Fibreglass – A slightly more modern (durable) addition, the pre fabricated materials, are best used on flat roofs but can be used on any type and last around 30 years so. It also is very flame resistant.

Plastic – A near clone of the Corrugated iron we spoke about except its plastic. Not so great at insulation and more common in a lean-to than for a property but it is good to let light in.

Felt – More commonly used on your garden shed, it’s commonly an underlay and can help with waterproofing it is not very durable.

Non standard property problems

The most common problem with Non-standard construction is insurance costs or mortgage providers needing additional steps to secure a loan. unlike a traditional construction house, they may require more upkeep or fail/degrade much faster than other materials which are problematic when getting insurance or trying to get a mortgage lender to give a loan for such a property.

BISF properties

Produced by the British Iron and Steel Federation, BISF houses were produced from 1946 after WW2 to help demand and tend to have some form of cladding, This might look like brick or stone walls covering the steel frame. BISF Houses should not be confused with prefabricated houses built around the same period.

Wimpey No-Fines

Wimpey No-Fines is a type of non-standard construction used in the UK during the mid-20th century, particularly in the 1950s and 1960s. It was developed by Wimpey Construction and was widely used to build social housing.

The construction method involves casting the walls of the property in one piece using a type of lightweight aggregate concrete, with no added fines (small pieces of crushed stone or gravel). The lack of fines gives the concrete a porous, honeycomb-like structure which allows it to breathe and prevents moisture buildup inside the walls.

The Wimpey No-Fines construction was popular due to its low cost and quick construction time, as well as being seen as a modern and innovative building method at the time. However, over time concerns have been raised about the durability and structural stability of these properties, as they can be prone to cracking and other issues.

Today, many mortgage lenders and insurance companies are cautious about lending against or insuring Wimpey No-Fines properties, and some local authorities have implemented policies to prevent their construction in new builds. It is recommended that potential buyers of Wimpey No-Fines properties commission a structural survey to assess the condition of the property before making a purchase.

Help with selling a non-traditional construction house

thatched roof house The first thing you might need to accept is it could take a bit longer to sell a property that’s a bit different. It by no means makes the property worse and can have some very unique properties that potential buyers might want. For example, a thatch roof required a lot of maintenance but some people might fall in love with a property with a unique feature like thatch.

Convert – unless your property is listing building you could change the materials for more standard materials, however, there will be significant costs involved and sometimes this can be beneficial if e.g. a roof or wall requires replacement but shouldn’t be the first point of call if you are trying to sell.

Quick house sale company – if you are struggling to find a potential buyer due to having non standard home then a cash house purchase might help. Whilst you wouldn’t get the full market value you also wouldn’t need to worry about additional conveyancing and the hassle of trying to sell problematic properties. Cash offers have no obligation so it’s worth finding what you could get to keep your options open.metal and glass balconies

Auction – If your property is especially unique you might find you have more luck with a specialist auction house who deal with unusual houses and will have buyers who might be looking for uncommon or non standard homes.

Feel free to talk to us about any concerns you may have about selling none standard properties, we have had a lot of experience.

Buying non standard construction properties

If you are looking to buy a non standard property there might be some other factors from additional legal or mortgage costs to just outright needing specialists.

You will need to find a mortgage lender who deals with property with unusual construction, lucky there are plenty of comparison sites out there to assist with this.

Insurance is very much the same as a mortgage you’ll need a specialist to help with insurance due to additional problems the house might face over its lifetime, sites like go compare can help you compare insurance providers.

You’ll want to ensure you get a good surveyor when buying a property as depending on the material there can be expensive problems to deal with if left unchecked. Sometimes unusual properties can also be covered in cladding with can cause additional issues.

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With thanks to NSH who have listed defective properties

Defective Property Type BRE Report Ref
Airey P003
Ayrshire County Council P010
Blackburn Orlit P024
Boot Pier and Panel P026
Boswel S007
Cornish Unit Type I P039
Cornish Unit Type II P040
Dorran P046
Gregory P055
Mac-Girling PO78
Myton P087
Newland P090
Orlit P091/ P092
Parkinson P094
Reema Hollow Panel P101
Schindler S049
Smith P107
Stent P110
Stonecrete P113
Tarran Temporary Bungalow P115
Tee Beam P117
Ulster Cottage P122
Underdown P123
Unitroy P126
Unity Type I P127
Unity Type II P128
Waller P129
Wates P130
Wessex P132
Whitson-Fairhurst P134
Winget P137
WooIaway P138


You can see a sample of the ‘book’ that the references refer to here.