Concrete & Aircrete Blocks delivery in Welwyn Garden City

Choosing from our concrete blocks range

• Trench and foundation blocksWide blocks laid in foundation trenches instead of lots of concrete.
• Lightweight aggregate blocksLighter to handle with better thermal performance than dense blocks.
• Aircrete (aerated) blocksVery light, easy to cut and good insulators; check the strength grade for loadbearing work.
• Block paving and edgingsOn request alongside your sub-base and sand.

Estimating your concrete blocks

A single-skin block wall in Welwyn Garden City 4 m long and 2.1 m high is 8.4 m². At 10 blocks per square metre plus 5% you need 89 blocks, with about 0.12 tonnes of building sand and 2 bags of cement for the mortar at 1:4. Try the block calculator

Before your Welwyn Garden City delivery arrives

Blocks are banded on pallets and usually crane-offloaded where the vehicle and access allow; tell us the weight limit of any drive or the ground where pallets will sit. Welwyn Garden City is inside our standard mainland delivery area.

• Give us the full postcode for the drop point; deliveries around AL8 are priced to the exact address.
• If neighbours share the access, it helps to let them know a lorry is coming.
• Have someone on site for the delivery if you can, or agree a safe drop point with us in advance.

Before you order concrete blocks

Handling heavy blocks

Health and safety guidance discourages laying very heavy blocks by hand for long periods. Lighter blocks or planning the lift can make a big difference on site.

What strength do I need?

Most houses use 3.6 N/mm² or 7.3 N/mm² blocks. Your structural design, your building control officer or the block manufacturer's guidance sets the grade; tell us what is specified and we will match it.

In England, building work is checked against the Approved Documents, for example Part A for structure and Part L for energy efficiency, through your council's building control team or a registered building control approver.

Common questions from Welwyn Garden City

Can I use blocks in the foundations?

Yes, using blocks made for below ground, often trench blocks or dense blocks of the specified strength. Building control will check foundation design.

Do you deliver concrete blocks to trades and homeowners in Welwyn Garden City?

Both. Trades can apply for a trade account; homeowners and self-builders can order on a delivered quote.

How soon can concrete blocks be delivered in Welwyn Garden City?

We confirm the delivery date when we price your order, before you commit. It depends on the product, the quantity and whether it is a stock line or made to order.

Are aircrete blocks strong enough for an extension?

Many aircrete blocks are designed for loadbearing walls, but grades differ. Check the strength your design calls for and the manufacturer's guidance on use below DPC.