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Choose PayPal at checkout to pay later with Pay in 3.
Complete your purchase with the first payment today.
Remaining payments are taken automatically.
Pay in 3 is a form of credit, so carefully consider whether the purchase is affordable and how you will make the repayments. Be aware of the possible impact of using Pay in 3 and of missing payments, including making other borrowing more difficult or more expensive. Pay in 3 eligibility is subject to status and approval. 18+ UK residents only. Available for purchases of £30 to £2,000. Terms and conditions apply. PayPal Pay in 3 is a trading name of PayPal (Europe) S.à r.l. et Cie, S.C.A. 22-24 Boulevard Royal L-2449, Luxembourg.
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Split your purchase of £1.45 into 4 with no sign-up fees or late fees. Your purchase will be split into 4 payments, payable every 2 weeks
£0.36
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£0.36
second payment
£0.36
third payment
£0.36
fourth payment
How it works
Choose Clearpay at checkout to pay later with Pay in 4.
Complete your purchase with the first payment today.
Remaining payments are taken automatically.
Clearpay is unregulated credit. Use responsibly. 18+, T&Cs and late fees apply at clearpay.co.uk/en-GB
Clearpay lends you a fixed amount of credit so you can pay for your purchase over 4 instalments, due every 2 weeks. Ensure you can make repayments on time. You must be 18+ and a permanent UK resident (excl Channel Islands). Clearpay charges a £6 late fee for each late instalment and a further £6 if it’s still unpaid 7 days later. Late fees are capped at £6 for orders under £24 and the lower of £24 or 25% of the order value for orders over £24. Missed payments may affect your ability to use Clearpay in the future and your details may be passed onto a debt collection agency working on Clearpay’s behalf. Clearpay is credit that is not regulated by the Financial Conduct Authority. T&Cs and other eligibility criteria apply at clearpay.co.uk/terms
100mm Solid Dense 7.3N Concrete Blocks are high-strength, load-bearing masonry units essential for robust construction in both domestic and commercial projects. Engineered for durability, these blocks offer a compressive strength of 7.3N/mm², making them an ideal choice for structural walling, foundations, and heavy-duty load-bearing applications. Their solid, dense construction ensures excellent fire resistance and sound insulation properties.
Purchasing these blocks individually provides maximum flexibility for small-scale projects, site repairs, or finishing tasks where full packs are not required. This per-block approach allows for precise ordering to minimise excess material on site, ensuring cost-effectiveness for smaller masonry works.
Features & Benefits
7.3N compressive strength: High-load capacity suitable for structural piers, load-bearing walls, and reinforced openings.
Solid dense construction: Provides superior acoustic insulation and non-combustible fire resistance for safety and comfort.
Versatile masonry unit: Compatible with standard mortar types for efficient laying and bonding in various structural configurations.
Flexible ordering: Purchasing by the block allows for precise project quantities, reducing site waste and storage requirements.
Structural durability: Designed for longevity in both below-DPC and above-ground applications.
Standard dimensions: 100mm thickness ensures compatibility with common wall construction systems and framing depths.
Applications
Foundation walling: Standard choice for below-DPC applications such as foundations and sleeper walls.
Internal load-bearing walls: Suitable for supporting upper floors, ceilings, and roof structures.
Separating walls: Provides essential acoustic insulation and fire resistance between dwellings.
External walls: Forms the structural inner leaf of a cavity wall or a solid wall when finished with render, cladding, or other protective systems.
Piers and columns: Used to build structural piers to support heavy beams, lintels, or rolled steel joists (RSJs), and to reinforce door and window openings.
Retaining walls (non-structural): Commonly used for small-scale garden landscaping, such as creating raised flower beds or low garden terraces.
Infill panels: Frequently used as fire-resistant, secure infill between steel or timber frame members in industrial or commercial builds.
Firewalls: Utilised to create compartment walls in garages or workshops to effectively slow the spread of fire.
Garden and boundary walls: High compressive strength provides the necessary structural mass for freestanding walls and external boundaries up to 1.2m in height.
Fireplace and chimney construction: Non-combustible A1 rated material ensures suitability for chimney breast rebuilding and fireplace surrounds in compliance with Building Regulations Part J.
Acoustic separating walls: High density material weighing approximately 2000kg/m³ provides the required sound attenuation for internal partitions in multi-occupancy dwellings to meet Part E requirements.
Installation Guidance
Lay with appropriate mortar: Apply a consistent bed and perpend of mortar to ensure structural integrity and load distribution.
Ensure level bedding: Use a spirit level regularly to maintain plumb and level courses throughout the wall height.
Apply correct ties: When constructing cavity walls, use appropriate wall ties at specified centres to secure the inner and outer leaves.
Handle with care: Although robust, use mechanical handling where possible to maintain the integrity of the blocks and prevent site-based damage.
Compliance & Performance
Compressive strength: 7.3N/mm² structural rating.
Fire resistance: Non-combustible material; provides reliable compartmentation.
Acoustic performance: High-density mass assists in noise reduction between rooms and dwellings.
Important note: Always consult local building regulations and structural engineering specifications regarding the design of retaining walls or load-bearing piers, as reinforcement may be required based on specific site loads. Orders requiring a pallet will incur a refundable pallet charge. Our customer service team will confirm if this applies to your order.
Delivery & Returns Information
Delivery charges vary by product category and order value. Items may ship from different suppliers and arrive separately, so delivery charges can be shown per part of your order at checkout.
Standard (Nationwide) Delivery
Core Products
Core
ORDER VALUE
DELIVERY CHARGE
Under £100
ex. VAT
£25
ex. VAT
Between £100 - £250
ex. VAT
£10
ex. VAT
Above £250
ex. VAT
FREE
Core Delivery is our most competitive delivery fee. To qualify for Core Delivery, all the products in your basket need to be from our Core range. Core products have the Core icon next to their picture.
Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products
ORDER VALUE
DELIVERY CHARGE
Under
£300
£30
ex. VAT
Over
£300
ex. VAT
FREE
Express Delivery
Express Delivery - Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products
We work with a nationwide network of trusted suppliers. Items in your basket may be supplied by different suppliers and delivered separately. Where this applies, you will see delivery charges shown at checkout for each part of your order. We always aim to group products from the same supplier to keep delivery costs as low as possible.
Delivery areas
Delivery charges apply to mainland UK, excluding: AB, CA, CF, DD, DG, EH, EX, FK, KA, KW, KY, IV, LA, LD, LL, ML, NP, PA, PH, PL, SA, SY, TR, TQ and TD.
If your address is in one of these areas, we will contact you before processing your order to confirm any additional costs. We do not currently offer delivery outside the UK mainland.
What to expect on delivery day
Deliveries are typically kerbside.
Please ensure someone is on-site to accept delivery. For heavier items, help with offloading may be required.
Many building materials arrive on large vehicles. If access is restricted, a specialist vehicle such as a HIAB may be required and could incur an additional charge.
Why delivery can cost more than typical parcel delivery
Building materials often travel on larger vehicles and usually carry fewer drops per run than parcel networks. That is why delivery charges can be higher than standard e-commerce shipping.
Returns
Returns depend on what you have bought and whether there is anything wrong with it. For full details on eligibility, timeframes, and exclusions, please see our full policy.
This product is our standard concrete block, suitable for a wide range of applications. We source it from various distributors across the UK, all of whom meet the required standards for quality and strength. However, not all of these blocks are certified to BS EN 12620.
If BS EN 12620 certification is essential for your project, we recommend ordering a branded product such as Celcon, which comes with confirmed BBA certification. Alternatively, please contact the Materials Market team before purchasing so we can ensure the product meets your project requirements.
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