Concrete Base for Shed, Garage or Garden Room
Need a strong, perfectly level concrete base for your shed, garage, or garden room? At CJ Groundworks, we install durable, regulation-compliant bases across Sussex, Surrey, and Kent — ideal for sheds, workshops, and timber-framed buildings.
With over 35 years of experience in groundworks and shed base concrete installation, our expert team delivers professional results for every project, from small storage sheds to large garden offices and annexes. Whether you’re in need of concrete for shed bases in Surrey or shed base concrete in Kent, we provide a solid foundation built to last.
/ Our Services
Concrete Base Services
Shed & Garden Room Bases
- We install bespoke concrete shed bases for:
- Garden sheds & summerhouses
- Timber cabins & garden offices
- Workshops & home gyms
- Each base includes:
- Compacted Type 2 sub-base
- Damp-proof membrane
- Steel mesh reinforcement (where required)
- Smooth trowel or brush finish
Garage & Outbuilding Bases
- For larger, heavier structures, we offer:
- Thickened bases to support weight
- Insulated slab options
- Formwork & finishing to architectural spec
Bases for Modern Garden Buildings
- We regularly construct bases for:
- Garden rooms & outdoor studios
- Timber-framed annexes
- Gym cabins & playrooms
- Storage buildings & bike sheds
- No matter your project, we’ll tailor the size, finish and reinforcement to ensure long-term structural support and aesthetic alignment with your landscape.
/Planning
Key Considerations for Concrete Base Installation
Every installation starts with a site assessment to ensure lasting performance. We’ll help you consider:
-
Ground conditions
Is excavation or levelling needed? -
Building load
Will it house equipment, furniture or vehicles? -
Insulation needs
Does the space need thermal performance? -
Finish preference
Smooth or brushed for anti-slip? -
Drainage & moisture control
Do you need a soakaway or water diversion?
Our team ensures every detail is right before pouring begins, giving you confidence that your shed base concrete will perform for years to come.
/ Our Mission
Why Choose CJ Groundworks?
35+ Years of Experience
A long-standing reputation built on expert workmanship.
In-House
Team
No subcontractors; we keep all trades under one roof.
Fully Insured &
Guaranteed
No subcontractors; we keep all trades under one roof.
Compliant &
Certified
All works carried out to UK building regs and environmental standards.
Local
Expertise
Proudly serving Sussex, Surrey & Kent.
/ Our Area
Locations We Cover
We install concrete bases across:
- Cranleigh
- Horsham
- Midhurst
- Petworth
- Pulborough
- All surrounding areas in Sussex, Surrey, and Kent
Get a Free Quote for Your Shed
or Garage Base
/ FAQs
Frequently Asked Questions
For most sheds, 100mm is suitable. Heavier buildings such as garages may need 150mm. We’ll assess the requirements to ensure proper strength and durability.
Yes — a stable base is essential to prevent warping, sinking or moisture damage. A concrete shed base provides long-term support and weather resistance.
While possible, improper preparation can cause cracks or uneven levels. We use the correct mix, compaction, and reinforcement to ensure your base is perfect and compliant with UK Building Regs.
Costs depend on size, ground condition, and access. Smaller bases start from around £300–£600, with larger reinforced slabs priced accordingly. We provide transparent, fixed quotes with no hidden fees.
Most projects are completed within 1–2 days, with 24–48 hours required for curing before any structure is installed.
/Our Contact
Ready to break ground?
Get in touch with CJ Groundworks today to discuss your project and receive a free, no-obligation quotation. Our team is here to answer your questions and provide expert advice tailored to your needs.
Address
CJ Groundworks, Lower Batchelors, Emms Lane, Barns Green, West Sussex, RH13 0QH.
/Our Testimonials