Although concrete bases usually have a higher upfront cost than paving slabs, timber, or gravel systems, they offer superior durability, stability, and minimal maintenance over time. With typical material costs of £123–£170 +vat per cubic metre (excluding installation), concrete bases often prove to be the most cost‑effective solution across the lifespan of the shed.

Concrete typically gains sufficient strength to support light loads within 3–7 days, but full curing takes up to 28 days. In most cases, sheds can be installed after several days, provided heavy loads are avoided. Protecting the slab from frost, heavy rain, and rapid drying during early curing is essential to prevent surface defects and cracking.

Yes. Where access is restricted, concrete pumps, particularly line pumps, are commonly used to deliver concrete to the rear of properties. Pumping allows accurate placement of concrete without excessive manual handling and is especially effective for residential gardens with limited or no vehicle access.

A properly constructed sub‑base is critical for long‑term performance. Most concrete shed bases require 100–150 mm of compacted MOT Type 1 stone beneath the slab. This provides a stable, free‑draining foundation and prevents settlement by evenly distributing loads across the ground. In some cases, a damp proof membrane is also installed above the sub‑base to reduce moisture ingress.

Reinforcement is not always essential for very small sheds, but it is strongly recommended for anything beyond light domestic use. Steel reinforcement mesh such as A142 or A193 improves tensile strength and helps control cracking caused by shrinkage, temperature changes, and minor ground movement. Fibre reinforcement may also be used to enhance crack control throughout the slab.

Concrete base thickness depends on shed size and usage. Small sheds typically need a slab 75–100 mm thick, while medium sheds benefit from 100–125 mm. Larger sheds, workshops, or garden rooms usually require a minimum thickness of 125–150 mm to ensure adequate load‑bearing capacity and resistance to cracking.

For most domestic shed bases, C25 concrete is the most commonly recommended option. It provides sufficient strength for small to medium sheds used for general storage and garden equipment. Where heavier loads are expected—such as workshops or sheds housing machinery—C30 or C35 concrete offers increased strength and durability. The choice should always reflect the intended use and load requirements of the structure.