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Lightweight Aggregate Blocks
Looking for lightweight concrete blocks for your next project? Our stocked range of Interfuse and Interlyte lightweight aggregate blocks includes popular sizes like 75mm, 100mm, and 140mm, available in 3.6N and 7.3N strengths. These light to medium density blocks are ideal for internal partition walls, cavity wall construction, and beam and block flooring. Fast delivery on all Lightweight Concrete Blocks stock items or same day collection from Peterborough & Huntingdon branches.
Lightweight Aggregate Concrete Blocks – In Stock for Delivery Near Peterborough, Huntingdon & Corby
Manufactured from natural aggregates, all blocks feature a textured finish suitable for plastering, rendering, or dry lining.
✅ Fast delivery available across Peterborough, Huntingdon, Corby, and surrounding areas
✅ Same-day collection from your nearest branch
✅ Great prices on 100mm concrete blocks, 140mm blocks & more
✅ Trusted trade choice for builders, contractors, and DIY projects
Whether you're working on a new build, home extension, or commercial project, our lightweight concrete blocks are ready to go — in stock and locally available.
Interfuse Interlyte Lightweight 75mm Solid Medium Density Concrete Block 3.6N
Interfuse Interlyte Lightweight 75mm Solid Medium Density Concrete Block 3.6N - a concrete building block manufactured from natural aggregates that can be used in a multiple of applications, including internal/external walls. They have a textured finish which can be plastered, rendered or dry lined.
Stock Availability: In stock
£1.86 incl tax
Interfuse Interlyte Lightweight 100mm Solid Medium Density Concrete Block 3.6N
Interfuse Interlyte Lightweight 100mm Solid Medium Density Concrete Block 3.6N - medium-density concrete block with a textured finish. Ideal for internal walls and cavity external walls. Can be plastered, rendered, or dry lined.
Stock Availability: In stock
£1.92 incl tax
Forterra 100mm Fenlite Medium Density Paint Grade Concrete Lightweight Block 7.3N
Forterra 100mm Fenlite Medium Density Paint Grade Concrete Lightweight Block 7.3N ideal for internal walls, separating walls, and cavity wall construction above DPC. Lightweight for easier installation, offering good acoustic and thermal performance. Features a paint-grade surface suitable for direct decorating, painting, or a light skim coat. (Not suitable for render, below-DPC external walls, or beam & block floors.)
Stock Availability: Out of stock
£2.70 incl tax
Forterra 100mm Fenlite Solid Medium Density Concrete Lightweight (Flooring) Block 7.3N
Forterra 100mm Fenlite 7.3N Solid Medium Density Concrete Lightweight (Flooring) Block designed for beam & block floor infill as well as cavity wall and internal wall construction above and below DPC. Strong yet lightweight for easier handling on site, with a finish-ready surface that can be plastered, rendered, or dry lined. Suitable for solid external walls when installed with the correct protective finish in line with Forterra guidelines.
Stock Availability: In stock
£2.04 incl tax
Forterra 100mm Fenlite Solid Medium Density Concrete Lightweight Block 3.6N
Forterra 100mm Fenlite Solid Medium Density Concrete Lightweight Block 3.6N ideal for internal partitions, separating walls, and cavity wall construction above DPC. Easy to handle and install, offering thermal and acoustic benefits. Can be plastered, rendered, or dry lined. (Not suitable for below DPC or beam & block floors.)
Stock Availability: In stock
£1.98 incl tax
Tarmac 100mm Hemelite (flooring infill) Medium Dense Blocks 7.3N
Tarmac 100mm Hemelite (flooring infill) Medium Dense Blocks 7.3N ridges the gap between lightweight aircrete and heavy dense blocks. Its reduced density improves thermal efficiency and sound insulation while easing manual handling. Designed for use in load-bearing walls above and below the DPC as well as beam and block floor infill, it’s a versatile solution for both internal and external masonry.
Stock Availability: In stock
£2.46 incl tax
Tarmac 100mm Hemelite Standard Solid Medium Density Concrete Lightweight Block 3.6N
Tarmac 100mm Hemelite Standard Solid Medium Density Concrete Lightweight Block 3.6N suitable for general building work, including internal walls, cavity walls, partitions, walls above DPC and selected protected applications below DPC. With a dry density of 1450 kg/m³, it offers a good balance of strength, easier handling, sound insulation, thermal performance and fire resistance.
Stock Availability: In stock
From £1.98 incl tax
Interfuse Interlyte Lightweight 140mm Solid Medium Density Concrete Block 3.6N
Interfuse Interlyte 140mm Solid Medium Density Concrete Block 3.6N - medium-density concrete block with a textured finish. Ideal for internal walls and cavity external walls. Can be plastered, rendered, or dry lined.
Stock Availability: In stock
£2.89 incl tax
Interfuse Interlyte-Ultra Lightweight 100mm Solid Low Density Concrete Block 3.6N
Interfuse Interlyte-Ultra Lightweight 100mm Solid Low Density Concrete Block 3.6N - Ideal for internal and non-loadbearing walls where moderate strength is needed. Features a textured face for plastering, rendering, or dry lining.
Stock Availability: In stock
£2.34 incl tax
Interfuse 100mm Interlyte Close Textured Concrete Block 7.3N
Paint grade blocks have a smooth, close textured finish, this makes them ideal for applications where direct painting is required.
Stock Availability: In stock
£2.59 incl tax
Lignacite Ash GP Medium Density Concrete Block 3.6N 440x215 x 100mm
Lignacite Ash GP Medium Density Concrete Block 3.6N 440x215 x 100mm is perfect for general-purpose walling, including external cavity walls, internal walls, and firebreaks. Ideal for use in infill units for beam and block flooring, offering strength and versatility for various construction projects.
Stock Availability: In stock
£1.80 incl tax
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