The best cinder blocks in the UK 2023

Robust, affordable and easy to install, cinder block is the ideal material for building or extending a home. Before you make your real estate project a reality, you want to take stock of this product? We tell you everything in this guide to buying the best cinder blocks.

Hollow concrete block 1

Editor's Choice

Hollow concrete block

The best cinder block in 2021

Easily recognizable thanks to its H shape, this breeze block is mainly used for formwork, but also for retaining walls.

2,20 £ on Castorama

Also called formwork block, the formwork block allows to make very quickly retaining walls or lost formwork in masonry. The hollow shape of this block allows it to receive steel reinforcements on which the concrete will be poured to solidify the whole structure.

The strength class of this hollow block is not mentioned, but one thing is certain, it is capable of withstanding great pressure. This block is designed to support the entire weight of a small house or retaining wall. You can also use it to reinforce various structures on your property.

Hollow concrete block B40 2

The best cheap

Hollow concrete block B40

The best entry-level cinder block

This hollow concrete block B40 is ideal for the assembly of walls or external low walls. It can also be used for pool walls.

0,91 £ on Castorama

This hollow concrete block is presented in its most classic form. Indeed, it is composed of regular cells which end with flanges. It is thanks to these notches that we can realize the vertical joints between the blocks. The present model can be cut to a third or to 2/3. In this sense, it can be used for different purposes on a construction site or house extension.

With a resistance class of B40, this hollow concrete block promises a resistance of 40 kg/cm². Despite its shape and thickness, this block can be used to create a load-bearing wall or not, a fence wall or a garage wall.

Parpaing perforé B80 3

The best high-end

Parpaing perforé B80

The best high-end cinder block

In the cinder block family, the perforated block is the heaviest. This category of agglo is required for the construction of basements, but also for buried basements.

2,32 £ on Castorama
Concrete hollow corner block 4

A quality cinder block offered at a low price

Concrete hollow corner block

The best cinder block for your construction job

This corner block or post block is mainly used to create corners in a construction or an extension. The particularity of this block is that it can be cut in thirds.

2,24 £ on Castorama

Some building professionals are used to call this corner block, corner block or post block. This block is mainly used to create load-bearing walls, but also vertical ties. In the jargon of the building industry, the chain-linking designates the steel reinforcements which are installed on the periphery of a structure.

As you will notice on the picture, the cells of this corner block are of different sizes. The largest of these cells are used to pass a metal reinforcement through the height. These blocks are known for the reinforcement they bring to the corner of a wall, but especially because they drastically reduce the complexity of the work.

Buying guide • November 2023

Best cinder block

Any specific needs?

The best cinder block in 2021

The best entry-level cinder block

The best high-end cinder block

The best cinder block for your construction job

Your guide : Samuel

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Comparison table of the best cinder blocks

Hollow concrete block 5
Hollow concrete block B40 6
Parpaing perforé B80 7
Concrete hollow corner block 8
Hollow concrete block
Hollow concrete block B40
Parpaing perforé B80
Concrete hollow corner block
Easily recognizable thanks to its H shape, this breeze block is mainly used for formwork, but also for retaining walls.
This hollow concrete block B40 is ideal for the assembly of walls or external low walls. It can also be used for pool walls.
In the cinder block family, the perforated block is the heaviest. This category of agglo is required for the construction of basements, but also for buried basements.
This corner block or post block is mainly used to create corners in a construction or an extension. The particularity of this block is that it can be cut in thirds.
Item category
Brick block
Hollow breeze block
Perforated cinder block
Corner block
Net weight
0.01 kg
0.01 kg
0.01 kg
0.01 kg
20 x 20 x 50 cm
10 x 20 x 50 cm
20 x 20 x 50 cm
20 x 20 x 50 cm
Wall construction
Application possible
Supporting wall and various fittings
Interior and facade load-bearing wall, fence wall, garage wall
All foundations and footings of load-bearing and non-load-bearing walls
Wall corner reinforcement

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Buying guide - cinder block

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How to choose your cinder block

Given its many variations, choosing a cinder block is not easy. To obtain the best concrete block for your future real estate project, different criteria must be taken into consideration.

#1 - The strength of the cinder block

The hardness of the block is expressed through the strength class to which it belongs.
The 5 strength classes for concrete block are :

- Class B40: resistance to 40 bars or 40 kg/cm².
- Class B60 : resistance to 60 bars or 60 kg/cm².
- Class B80: resistance to 80 bars or 80 kg/cm².
- Class B120: resistance to 120 bars or 120 kg/cm².
- Class B160: resistance to 160 bars or 160 kg/cm².

The number following the letter B designates the breaking load of the breeze block which is expressed in tons (T). In other words, a linear meter of a B60 breeze block has a resistance of 60 kg/cm².

#2 - The dimensions

The standardized breeze blocks are exactly 20 x 25 x 50 cm (L x H x W) for a thickness between 5 to 32.5 cm depending on the type of masonry for which they are intended. As for the rectified breeze blocks, their dimensions are more rigorous, thus quite different from those of the classic breeze blocks.

#3 - The composition

The ordinary breeze block is composed of gravel, cement, sand and gravel. Some sub-varieties of breeze blocks, however, incorporate insulating materials such as shale, expanded clay or pumice.

Other types of blocks contain silica sand, plaster, lime and aluminum powder. After the manufacturing process and a long firing, the cinder block becomes a compact block that can be used for the foundation of a house, the base of a low wall, walls and even for the walls of a swimming pool.

#4 - The insulating properties

Many manufacturers have turned their attention to making cinder blocks that offer better insulation than traditional cinder blocks. To give them a good insulating property, cinder blocks are filled with insulation, most often foam insulation (glass wool, rock wool). They can also be filled with a semi-rigid material to which expanded polystyrene or a mineral binder has been added.

Of course, the cost of an insulating breeze block is higher than that of the classic breeze block.

#5 - The standards and labels

The two standards that frame the creation of agglos are the CE standard and the NF standard. Mandatory, the CE standard ensures that the breeze blocks have been manufactured in strict compliance with European regulations, particularly with regard to the environment. The NF standard, on the other hand, guarantees that the clinkers have been manufactured according to a set of specifications.

The breeze block: what you need to know!

The cinder block, also called agglo (for agglomerated concrete) is a parallelepipedic building element. Usually mass-produced in a factory, the breeze block is made from concrete poured into a mold, which is then compacted and baked in an oven.

For the purposes of your construction project, you will need to quantify the blocks. This will allow you to have enough for what you plan to do. For example, for 20 cm high blocks, count about 10 blocks for 1 m² of wall. For 25 cm high blocks, the same m² of wall is equivalent to 8 blocks.

Putting up a cinder block wall: a child's play for the do-it-yourselfer

Before building the wall, you need to have made the foundation and the mortar. For the latter, you will need a volume of cement for 3 volumes of sand and half a litre of water.

Here are the steps to follow for the assembly:

  • Start by marking out the location of the future wall with a chalk line. You must be rigorous, because the alignment of the wall will depend on this operation.
  • Then, lay the first layer of mortar. Spread a layer about 2.5 cm thick using a float.
  • When laying the first rows of cinder blocks, start at the corners and work your way out.
  • After finishing the first layer, continue with the next rows.
  • When the wall is up, you can start with the exterior finish. For this, you can use traditional plaster. But for aesthetic and practical reasons, turn instead to single-coat plaster, which is very advantageous. Not only is it applied only once, but the result far surpasses that of conventional plaster.

Building a breeze block house is eligible for financing

If your construction budget is tight, you should know that the use of cinder block is eligible for certain financial aid, the most popular of which is the zero-rate loan or PTZ. If you meet the conditions required by this financing, you will have the opportunity to repay the loan contracted at zero rate in 20 to 25 years. In addition, you can also qualify for the Social Accession Loan or PAS, the property tax exemption and the participation of the employer in the construction effort or PEEC.

Some disadvantages to highlight

Unfortunately, the cinder block is not without its drawbacks. First of all, its particular shape does not allow architectural fantasies. As for the thermal performance of traditional blocks, it leaves a little to be desired. The traditional concrete block is permeable and offers no natural hygrometric regulation.

The different types of cinder blocks

There are different categories of cinder blocks. The choice of the agglo will depend on the construction, but also on its many requirements. Assume that different blocks are needed for the design of foundations, walls, partitions, columns.

Hollow blocks

Hollow blocks are the most used agglos for the creation of a wall or a partition. These blocks have 6 cells and 2 flange-shaped ends which are used to fill the vertical joints.

This category of block has the particularity to be lighter than the other declensions. Their resistance is therefore lower than that of the solid block. In general, hollow blocks belong to strength classes B40 and B60.

Perforated and solid blocks

Perforated and solid blocks are very heavy. As such, they are most often used for foundations, basements or walls of a buried basement. These blocks are strong enough to support the entire structure of a home. Although the dimensions of hollow blocks and solid blocks are the same, perforated blocks have excellent crushing resistance.

These cinder blocks can support very heavy loads, especially those belonging to strength class B80 to B160.

Accessory blocks

These are the cinder blocks used for a specific purpose on a house. Among the different types of accessory blocks are:

- The jamb block or rabbet: with a flat end, this cinder block is used for the realization of the openings of the bay windows.
- The formwork block : H-shaped, it is used for formwork or retaining walls.
- The corner block: also called post block, this breeze block is used for the corners of a construction.
- The block of chaining: this breeze block is especially requested to put a lintel on an opening or to carry out the chaining of a house.

The cinder block or the brick?

The cinder block

The breeze block is probably the most used building material in the UK. Although it is more recent than the brick, its manufacturing process and its appearance have not changed for over a century.

Whether solid, hollow or perforated, cinder block is popular because it is easy to find and, above all, simple to use. Being non-combustible, cinder block offers very good fire resistance. Its density is also very interesting.

The brick

Unlike the cinder block, the brick is made from clay that is kneaded, shaped into a rectangular form, dried and fired in a huge oven. This historical material has lost its superbness in front of the cinder block, although it remains very appreciated for its insulating power and especially because it is able to regulate humidity.

Since the brick is less polluting to produce than the breeze block, it is more ecological and even easier to lay.


Brick and cinder block are both very advantageous. If brick offers better thermal performance and is not afraid of humidity, and offers a good regulation of hygrometry, cinder block is much more resistant and is more economical in every aspect.

Brick even has the luxury of being environmentally friendly when filled with insulation. Thus, the best way to reduce construction costs without impacting quality is to use cinder block.

5 good reasons to use cinder block

If cinder block is so popular in the construction industry, it is mainly for the many advantages it offers.

A very resistant building material

Yes, cinder block is a building material of a rare robustness. It resists very well to the bad weather and the wear of time. Buildings that are made with quality breezeblocks are able to withstand earthquakes and severe storms. With a good finish, a cinder block wall can last for half a century.

An affordable building material

When it comes to building a home, cinder block is probably the least expensive building material available to you. And, if you are considering building a low-energy home, you may be able to get financial assistance from the government or local communities in your area. A financial boost is always welcome when embarking on such a major life project as building a home.

A non-combustible material

The cinder block is a material that does not fear fire because of its particular composition. In this sense, a house that has caught fire and whose walls are made of cinder block is easier to save from flames.

A very easy material to install

The ease of installation is one of the undeniable advantages of cinder block. Any self-respecting mason can lay cinder block. The result is a reduction in construction time. If you are a bit of a handyman yourself, you can get to work, but start with low walls or partitions for example.

A material compatible with insulation

The breeze block is not very well known for its insulating properties, but this has changed recently. To improve the thermal insulation of the walls, you can add an insulating lining inside or outside. Yes, it costs extra, but it is well worth it.

What is the price for a cinder block

The diagram below will help you to get an idea of the typical prices for each price range (entry-level, mid-range and high-end).

However, more expensive does not necessarily mean better.

We therefore advise you to always consult our ranking before deciding, rather than blindly relying on price ranges.

0.5 £ to 1.5 £
1.5 £ to 2 £
more than 2 £
Price range diagram


Get a professional to assist you

Having trouble estimating the exact number of cinder blocks needed to build your home? Let a professional assist you. The only way to cut thermal bridges with the outside is to insulate the cinder block walls. To do this, you can choose between different types of insulation, the most effective of which are white polystyrene board and cork panels. Many building professionals recommend them.

Insulate your cinder block walls

The longevity of your home is going to depend on the quality of the cinder blocks you purchase. To optimize the durability of your future home, always choose cinder blocks with a minimum strength class of B60.

Don't skimp on costs

Small mishaps often occur on construction sites. So, to avoid putting the work on hold due to lack of breeze blocks, always plan for a few extra m².

Plan for a few extra square meters of cinder blocks

For sure, there are going to be unused cinder blocks when your house is finished. Instead of throwing those cinder blocks away, save them for a future build. You'll be amazed at the variety of structures that can be made with concrete blocks.

Recycle unused cinder blocks


How many cinderblocks does it take to raise a 1 m² wall? How to build a cinder block wall? How to clad the exterior of a cinder block wall? How to insulate the cinder block walls of a garage?

It is not difficult to estimate the number of blocks you need to build 1 m² of wall. If the height of the block is standard, i.e. not more than 20 cm, you need 10 cinder blocks to raise the wall 1 m². For a 200 m² wall, you will need 200 cinder blocks.

Erecting a cinder block wall is a job for professionals, but it is still within your reach. Concrete blocks are assembled with mortar. To make it simple, mark out the space, lay the first layer of mortar, lay the first row of cinder blocks and continue with the next rows.

Different solutions exist to dress the exterior of a cinder block wall. To do so, you have the choice between the classic coating or thesingle layer coatingwhich is applied in only one layer. This second solution is recommended for the time saving it provides.

The breeze block is not very well known for its insulating properties. To improve the insulation of the garage walls, use insulating concrete blocks, or have insulating plates installed by professionals. In a garage, extruded polystyrene sheets will provide the best result.


Note: Below are some of the sources we have consulted in writing this article. Links to other sites are not continuously updated. It is therefore possible that a link may not be found. Please use a search engine to find the desired information.
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  2. Brick or cinder block: what to choose and why?The cinder block,
  3. Price of a cinder block house: the essentials to know,
  4. What is the price of a cinder block house? | Hellopro Complete Guide,
  5. How to choose a cinder block? - All about concrete,
  6. The cinder block: which types for which use what price,
  7. All about the traditional cinder block house | The Materials,
  8. All about the methods of making cinder blocks,
  9. Building a cinder block wall: what you need to know,
  10. The best cinder blocks | Leroy Merlin,
  11. Printing: hollow, solid, bancher, corner | Castorama,
  12. Printing - Block & Brick of construction | Materials of ....,
  13. Parpaing : characteristics, advantages, disadvantages, price,
  14. Parpaing, hollow concrete block, hollow block, chaining block ...,
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  16. Brick, parpaing and building block | Bricomarché,
  17. The classes of parpaing and their prices - Cmesmat,
  18. Parpaing - Wikipedia,
  19. How to build a wall out of parpaing | Construction ....,
  20. Material sheet: cinder block -,
  21. Bloc Parpaing Creuso, Plein Et Chainage Pas Cher - Sainthimat,
  22. Définitions : cinder block - Dictionnaire de français Larousse,
  23. Parpaing : mise en oeuvre et prix - Ooreka,
  24. PARPAING CREUX - Parpaings - Gros Œuvre - Matériaux ...,
  25. Brick and cinder block - Material, powder & aggregate ...,
  26. Price of a pallet of cinder blocks | Average cost & info,
  27. What are the dimensions of a cinder block,
  28. Definition | Cinder block | Futura Maison,
  29. The cinder block, the basic building material, explanations,
  30. The insulating cinder block, advantages, disadvantages and price ...,
  31. ,
See more


March 2022 : Translation of this buying guide from our partner

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Our selection
Hollow concrete block 9
Hollow concrete block
Hollow concrete block B40 10
Hollow concrete block B40
Parpaing perforé B80 11
Parpaing perforé B80
Concrete hollow corner block 12
Concrete hollow corner block


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