How We Build Concrete Bases: A Step-by-Step Guide to Professional Groundwork

Plex Group explains the step-by-step process behind professional concrete base installation across Worcestershire, Gloucestershire, and Warwickshire — and why getting it right first time matters.

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Ground Preparation

Every Plex Group base begins with a site assessment. We check soil type, drainage patterns, and ground stability — essential in clay-heavy areas like Evesham, Cheltenham, and Moreton-in-Marsh. The area is excavated to 150–250mm, soft spots are removed, and the surface is levelled precisely using string lines and laser levels.

Sub-Base, Reinforcement, and Pour

MOT Type 1 crushed stone is laid and compacted in layers to create a firm, load-bearing foundation. Steel mesh (A142 or A193) is then placed on spacers before C25–C35 grade concrete is poured, compacted to remove air pockets, and screeded to a flat finish. For structures in Gloucestershire and Warwickshire with heavy loads, rebar grids provide additional tensile strength.

Finishing and Curing

The slab is finished to suit its purpose — smooth for patios, textured for workshops — then protected during curing with blankets or sheeting. Full strength develops over 28 days. Plex Group also ensures perimeter drainage is correct, preventing water from pooling around the edges and causing frost damage over time.

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Built for Clients Like You

Complete Hardscape Transformation in Guiting Power

A 10-day full-property hardscape overhaul in Guiting Power, featuring French Dolomite Limestone porcelain throughout, a bespoke pergola over an outdoor kitchenette, and full perimeter drainage.

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Privacy by Design: A Bespoke Cladded Boundary in Kingham

A 6-day boundary extension and fence installation in Kingham, built using tongue and groove cladding to create a seamless, architectural finish.‍

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House to the Garden: Composite Deck Replacement in Evesham

A 20 year old timber deck replaced with frosted blue composite boarding, a custom step, and a built-in fish pond access hatch

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What Every Professional Base Needs

  • Correct excavation depth for the structure's load
  • Compacted MOT Type 1 sub-base
  • Steel mesh or rebar reinforcement
  • Proper drainage at the perimeter
How thick should a concrete base be for a garden shed?

Most shed bases need 100–150mm. Heavier structures like garden rooms or garages require 150–200mm with reinforcement for long-term stability.

How long before I can use my concrete base?

You can walk on it within 24–48 hours, but wait at least a week before placing structures. Full strength develops over 28 days.

Do you install concrete bases in Gloucestershire and Oxfordshire?

Yes. Plex Group works across Worcestershire, Gloucestershire, Oxfordshire, and Warwickshire, including Cheltenham, Burford, Moreton-in-Marsh, and Stratford-upon-Avon.

Can a concrete base be built on uneven ground?

Yes. Professional excavation and levelling can accommodate sloped or uneven sites. Retaining edges are added where necessary to hold the form during pouring.

Built for Regional Conditions

From Burford and Moreton-in-Marsh to Stratford-upon-Avon and Evesham, soil conditions vary considerably. Plex Group's local expertise ensures every concrete base is designed for its specific site — not a generic specification. Get in touch to discuss your project.

Conclusion

Professional concrete bases require precision at every stage. Plex Group delivers groundwork installations built to last across Worcestershire, Gloucestershire, Oxfordshire, and Warwickshire.

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