Tel: 01207 544214
Fax: 01207 541800

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Suppliers of: concrete blocks, facing blocks, paving blocks, fairfaced blocks, lightweight concrete blocks

The Thomas Armstrong group of block manufacturing companies have been supplying a comprehensive range of Aerated, Lightweight, Dense aggregate load bearing concrete blocks from its factories throughout the North of England for over 50 years. We also manufacture a wide range of high quality paving blocks at our factories in Consett, Co Durham and Silloth, Cumbria.

Our concrete blocks manufacturing division consists of a number of long-established, well respected companies producing a wide range of high quality products. As these companies have been acquired by the Thomas Armstrong group, they have been upgraded and invested in continually over the years.

Thomas Armstrong (Concrete Blocks) Ltd - Rowlands Gill, Tyneside

Rowlands Gill, Whinfield Road, Newcastle-upon-Tyne. NE39 1EHTel: 01207 544214   Fax: 01207 541800   Email:

The first block plant in our group, formed in 1964 and is the divisional headquarters of Thomas Armstrong (Concrete Blocks) Limited.  

Thomas Armstrong (Concrete Blocks) Ltd - Consett, Co Durham

Park Road, Blackhill, Consett, Co Durham. DH8 5SPTel: 01207 505655   Fax: 01207 592345   Email:  

In 1991 Consett Block Manufacturing Limited was purchased and now forms the Paving Division of Thomas Armstrong (Concrete Blocks) Limited. 

Thomas Armstrong (Concrete Blocks) Ltd - Catterick, North Yorkshire

Bridge Road, Brompton-on-Swale, Richmond, North Yorks. DL10 7HWTel: 01748 810204   Fax: 01748 813950   Email: 

Built and comissioned in 2004, this state of the art facility represents the very latest technology in aerated block production using entirely unique and bespoke techniques resulting in products with unrivalled technical and physical performance. 

Stocks Brothers Ltd Thirsk - Pickhill, North Yorkshire

Cross Lane, Pickhill, Thirsk, North Yorkshire. YO7 4JQTel: 01845 567282   Fax: 01845 567606   Email: 

Founded in 1981 and acquired in October 1988 Garners Concrete Blocks Limited, a long established and respected local company, was acquired and was merged Into Thomas Armstrong (Concrete Blocks) Limited. 

Stocks Brothers Ltd - Leeds, West Yorkshire

Knowsthorpe Gate, Cross Green, Leeds. LS9 0NP Tel: 0113 2320022   Fax: 0113 2870839   Email: 

We acquired this company in 2007 and represents the  highest volume block manufacturing facility in our group. 

Thomas Armstrong (Concrete Blocks) Ltd - Silloth, Cumbria

Blackdyke, Silloth, Cumbria. CA7 4PDTel: 01900 68114   Fax: 01900 66136   Email:

Coulthard’s Concrete Blocks (1980) Limited was acquired In 1997 and manufactures an extensive range of building block and paving block products. 

William Rainford (Holdings) Ltd - Aintree, Merseyside

Heysham Road, Aintree, Liverpool, Merseyside. L30 6UFTel: 0151 5255991   Fax: 0151 5301676   Email:

Formed in 1970 and acquired in 1995, this respected and well known local company now operates from 2 sites. 

Barnetts (Buglawton) - Congleton, Cheshire

Brook Street, Congleton, Cheshire. CW12 1RHTel: 01260 273170   Fax: 01260 298150   Email:

Founded in 1931, this is the oldest and most well established company in our group. It  was acquired In February 1998 and uderwent a series of refurbishments and upgrades to the site and to the production equipment. 

Lakeland Pavers, Penrith, Cumbria

North Lakes Business Park, Flusco, Penrith, Cumbria. CA11 0JBTel: 01900 68114   Fax: 01900 66136   Email:

Founded in 1989, Lakeland Pavers Limited have become regarded as the leading regional producer of a wide range of high quality and innovative paving producs in addition to providing a range of concrete building block products.

 Throughout these facilities we provide a vast range of concrete products, Our products include:

 Lightweight & Dense Concrete Blocks:

 Airtec Aerated Blocks:

  Paving Blocks and Fittings:

All our paviors are manufactured to the highest quality and carry a guarantee for their strength.

All of our concrete blocks and paving products are manufactured to European Standards and as such have all been C E Marked. To view our CE Certificates please click here.

Useful resources:

Building Information Modelling (BIM) components: Click Here and view our product BIM files.

NBS Specifications - here you can find the lastest NBS specifications for all of our products.


We pride ourselves on our Environmental & Sustainability programme in line with the requirments of ISO 14001:2004. As well as ensuring that our products are sustainable and the constituent materials are responsibly sourced, we are continually monitoring our generation of  greenhouse gases and look for ways to further reduce this. To find out more about our environmental & sustainability programme  click here.

BLOCKS Aggregate .
BLOCKS Aggregate BS EN 771-3:2003
BLOCKS Aggregate Lightweight
BLOCKS BRE BES 6001 Responsible Sourcing (RSM) .
BLOCKS BRE BES 6001 Responsible Sourcing (RSM) Rating Excellent
BLOCKS BS EN 771-3 .
BLOCKS Cellular Concrete .
BLOCKS Cellular Concrete BS 5628 Part 1
BLOCKS Concrete .
BLOCKS Concrete Beam and Block Flooring Infill .
BLOCKS Concrete Beam and Block Flooring Infill Large Format
BLOCKS Concrete Below DPC .
BLOCKS Concrete by Sizes (Metric) Actual: 290mm x 215mm
BLOCKS Concrete by Sizes (Metric) Actual: 300mm x 215mm
BLOCKS Concrete by Sizes (Metric) Actual: 300mm x 250mm
BLOCKS Concrete by Sizes (Metric) Actual: 300mm x 275mm
BLOCKS Concrete by Sizes (Metric) Actual: 320mm x 280mm
BLOCKS Concrete by Sizes (Metric) Actual: 350mm x 250mm
BLOCKS Concrete by Sizes (Metric) Actual: 440mm x 215mm
BLOCKS Concrete by Thickness (Metric): 75mm
BLOCKS Concrete by Thickness (Metric): 90mm
BLOCKS Concrete by Thickness (Metric): 100mm
BLOCKS Concrete by Thickness (Metric): 140mm
BLOCKS Concrete by Thickness (Metric): 190mm
BLOCKS Concrete by Thickness (Metric): 215mm
BLOCKS Concrete Dense .
BLOCKS Concrete Dense Cellular
BLOCKS Concrete Dense Hollow
BLOCKS Concrete Dense Robust Detail E-WM-9 , E-WM-1
BLOCKS Concrete Dense Textured Face
BLOCKS Concrete Environmental Management Systems ISO 14001:2004 Certificate Holders
BLOCKS Concrete Fairfaced .
BLOCKS Concrete Fire Resistant BS 5628: 3 hour Loadbearing
BLOCKS Concrete Fire Resistant BS 5628: 4 hour Loadbearing
BLOCKS Concrete Fire Resistant BS 5628: 6 hour Loadbearing
BLOCKS Concrete Fire Resistant Eurocode BS EN 13501-A1
BLOCKS Concrete Fire Resistant Eurocode ENV1996-1-2-:1995
BLOCKS Concrete Fire Resistant Eurocode Euroclass A1
BLOCKS Concrete Hollow .
BLOCKS Concrete Midi Construction (D M) Regs 1994 Handling Requirements
BLOCKS Concrete Slip .
BLOCKS Coursing .
BLOCKS Coursing Brick Format Units
BLOCKS Facing .
BLOCKS Facing Fairfaced Finish
BLOCKS Facing Rockfaced Finish
BLOCKS Facing Textured Finish
BLOCKS Flooring .
BLOCKS Foundation .
BLOCKS Foundation BS EN 771-3:2003
BLOCKS Foundation Lightweight Aerated Concrete
BLOCKS Lightweight Aerated Concrete .
BLOCKS Lightweight Aerated Concrete Beam and Block Flooring Infill
BLOCKS Lightweight Aerated Concrete Below DPC
BLOCKS Lightweight Aerated Concrete Brick Coursing Size
BLOCKS Lightweight Aerated Concrete BS EN 771-4 (BS 6073)
BLOCKS Lightweight Aerated Concrete Cavity Wall
BLOCKS Lightweight Aerated Concrete High Strength
BLOCKS Lightweight Aerated Concrete Infill
BLOCKS Lightweight Aerated Concrete Inner Leaf
BLOCKS Lightweight Aerated Concrete Internal Facing
BLOCKS Lightweight Aerated Concrete Large Format
BLOCKS Lightweight Aerated Concrete Party Walls Part £
BLOCKS Lightweight Aerated Concrete Party Walls Robust Standard Detail
BLOCKS Lightweight Aerated Concrete Thin Layer Joint Masonry
BLOCKS Lightweight Concrete: .
BLOCKS Paintgrade Finish Smooth
BLOCKS Recycled Aggregate .
BLOCKS by Strength K values (3pc Moisture Content) 2.8 N per Square mm more than 0.15 W/M.C
BLOCKS by Strength K values (3pc Moisture Content) 3.5 N per Square mm more than 0.14 AND less than 0.26 W/M.C
BLOCKS by Strength K values (3pc Moisture Content) 4.0 N per Square mm more than 0.14 AND less than 0.26 W/M.C
BLOCKS by Strength K values (3pc Moisture Content) 7.0 N per Square mm more than 0.14 AND less than 0.26 W/M.C
BLOCKS by Strength K values (3pc Moisture Content) 10.0 N per Square mm more than 0.14 AND less than 0.26 W/M.C
BRICKS Concrete .
BRICKS Concrete Coursing .
COURSING BRICKS Concrete Coursing Common Units / Frogged Units .
COURSING BRICKS Concrete Coursing Solid Units .
COURSING BRICKS Concrete Slips .
COURSING BRICKS Concrete Slips BS 771-3 CE Marked .
KERB Edgings .
KERB Units .
KERBS Crossings .
PAVING Concrete .
PAVING Decorative Concrete .
PAVING BLOCKS Aged Brick Appearance .
PAVING BLOCKS Cobble Appearance .
PAVING BLOCKS Decorative .
PAVING BLOCKS Decorative Circle Features .
PAVING BLOCKS Driveway Drives
PAVING BLOCKS Granite Sett Appearance .
PAVING BLOCKS Light Vehicular .
PAVING BLOCKS Textured Finish .
RETAINING WALL Blocks Concrete
RETAINING WALL Blocks Concrete EN 771-3 CE Marked
RETAINING WALL Blocks Hollow Dense Concrete
UNITS Precast Concrete Coursing
AIRTEC Aerated Concrete Blocks
AIRTEC BRICKETTES Aerated Concrete Coursing Blocks
AIRTEC FOUNDATION Aerated Concrete Blocks
AIRTEC PARTY WALL Aerated Concrete Blocks
AIRTEC SEVEN Aerated Concrete Blocks
AIRTEC STANDARD Aerated Concrete Blocks
AIRTEC XL Aerated Concrete Blocks
ARMPAVE Block Paving
ARMSTART Foundation Block
BEAMISH Block Paving
CELLULAR Concrete Block
FAIRTEX Fairfaced Block
INSULITE Lightweight Blocks
MERESTONE Block Paving
MIDI Concrete Block
PREMIER INSULITE Lightweight Blocks
ROCKFACED Facing Blocks
ULTRALITE Aggregate Blocks

Thomas Armstrong continues its expansion

August 2019

Thomas Armstrong continues its expansion

Thomas Armstrong (Holdings) Ltd are pleased to announce their latest acquisition of the Sellite Blocks Limited, a Yorkshire based building block manufacturer.

Based in Great Heck near Leeds, Sellite Blocks Limited is a well-established and highly regarded building block manufacturer of eco-friendly building blocks. With a workforce of 14 and an annual turnover of £5 million, it has served national house builders and builders’ merchants for over 60 years.

Established in 1830, Thomas Armstrong (Holdings) Ltd already has an extensive portfolio of specialist services alongside manufacturing a wide range of high-quality building products to meet the continuing demands and changes within the construction industry. Based in Cumbria, the company’s depth of history, knowledge and expertise has enabled it to become a leading and well-known construction manufacturer across the North of England.

Keith Denham, Group Managing Director and Chief Executive of Thomas Armstrong (Holdings) Ltd comments: ‘We are delighted to announce the successful completion of our new acquisition of Sellite Blocks Limited. This latest acquisition will provide valuable wealth and expertise to our company as well as enhancing our services and products to our clients and customers. This has also given us the opportunity to strengthen our brand and to continue to maintain our competitive position within the construction industry.

‘We are looking forward to working with everyone at Sellite particularly Colin Hope and we are excited about what the future will bring in the many years to come.’

Mr Colin Hope, currently Managing Director of Sellite Blocks Limited will join The Thomas Armstrong Group in a new role following the acquisition along with the entire Sellite workforce.

Our new Leeds concrete block plant achieves BES 6001 'Excellent' status.

August 2019

Our new Leeds concrete block plant achieves BES 6001 'Excellent' status.

Our new multi-million pound Stocks Bros Ltd concrete block plant in Cross Green Leeds has achieved the highest possible rating of 'Excellent' to the Responsible Sourcing standard BES 6001.

This is only the 2nd block plant anywhere to have ever achieved this, the first being our Airtec aerated block plant in Catterick.

What is BES 6001?

BRE’s BREEAM scheme (Building Research Establishment Environmental Assessment Method for buildings) awards credits for responsibly sourced materials. The aim of these credits is to encourage the specification and procurement of responsibly sourced materials in construction. To achieve credits under Mat 03: Responsible Sourcing of Materials, applicable materials must be covered by BREEAM recognised environmental management or Responsible Sourcing Certification Schemes. BES 6001 is one such management scheme.

The BES 6001 responsible sourcing scheme Issue 3.0 means that using our ‘Excellent’ and ‘Very Good’ certified products will help gain maximum credits under MAT 03 in BREEAM 2011 and 2014. It also means that all certified products are Tier One under MAT 2 for Code for Sustainable Homes, making it easier for customers to achieve a higher number of points towards credits at no additional cost.

The Certification Process

The Standard has been structured so that compliance can be demonstrated through a combination of meeting the requirements of other recognised certification schemes, establishing written policies, setting objectives and targets and engaging with relevant stakeholders. To comply with the standard a product must meet a number of mandatory criteria. Where a product demonstrates compliance beyond the mandatory levels, higher levels of performance can be achieved. The standard's performance ratings range from Pass to Good, Very Good and Excellent.

The strict requirements of BES 6001 require companies to demonstrate, from origin to use:

Effective Quality, environmental and health and safety management systems
Efficient use of energy and reduction of greenhouse gas emissions
Sustainable and efficient use of material resources and water
Ethical business practices and compliance with applicable laws and regulations
Responsible site stewardship in relation to avoiding pollution and protecting the environment
Minimising the impact of transport associated with the delivery of the constituent materials used in manufacture, waste disposal and the delivery of products to our customers
Liaising with the local community of matters of mutual interest

Technical Manager John Mason, comments: “This is another significant milestone for the Thomas Armstrong group. We are delighted to have achieved BES 6001 Excellent status at our new facility in Leeds which in fact makes this and our Airtec plant in Catterick the only concrete block facilities anywhere to have achieved the highest possible Excellent rating. This achievement reflects our ongoing commitment to improving our environmental and social performance, as well as adding third party accreditation to our responsible sourcing claims. BES 6001 is an important and difficult to achieve standard and will be extremely valuable to customers looking to procure building blocks with sound and verified environmental credentials and traceability. There are many benefits to this certification for us as a company and for our customers, who can be confident that our dedication to responsible manufacturing stretches way beyond our own manufacturing plants.”

Certificates can be downloaded from our website and from the BRE Green Book Live website

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